SP3223E/EB/EU Intelligent +3.0V to +5.5V RS-232 Transceivers FEATURES • Meets true EIA/TIA-232-F Standards EN 1 20 SHUTDOWN from a +3.0V to +5.5V power supply • Interoperable with EIA/TIA-232 and C1+ 2 19 Vcc adheres to EIA/TIA-562 down to a +2.7V V+ 3 18 GND power source C1- 4 17 TOUT • AUTO ON-LINE® circuitry automatically 1 C2+ 5 SP3223E 16 RIN wakes up from a µA shutdown 1 • Minimum 250Kbps data rate under load C2- 6 15 ROUT 1 (EB) V- 7 14 ONLINE •  Mbps data rate for high speed RS-232 TOUT 8 13 TIN (EU) 2 1 • Regulated Charge Pump Yields Stable R2IN 9 12 T2IN RS-232 Outputs Regardless of V ROUT 10 11 STATUS CC 2 Variations • ESD Specifications: +5KV Human Body Model Now Available in Lead Free Packaging +5KV IEC6000-4-2 Air Discharge +8KV IEC6000-4-2 Contact Discharge DESCRIPTION The SP3223 products are RS-232 transceiver solutions intended for portable applications such as notebook and hand held computers. These products use an internal high-efficiency, charge-pump power supply that requires only 0.µF capacitors in 3.3V operation. This charge pump and Exar's driver architecture allow the SP3223 series to deliver compliant RS-232 performance from a single power supply ranging from +3.3V to +5.0V. The SP3223 is a 2- driver/2-receiver device ideal for laptop/notebook computer and PDA applications. The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shut- down state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down drawing less than µA. SELECTION TABLE Device Power RS- 232 RS-232 AUTO ON-LINE ® TTL Data Rate Supplies Drivers Receivers 3-state (kbps) SP3223E +3.0V to +5.5V 2 2 YES YES 20 SP3223EB +3.0V to +5.5V 2 2 YES YES 250 SP3223EU +3.0V to +5.5V 2 2 YES YES 000 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 

ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those Output Voltages TxOUT.............................................................+3.2V indicated in the operation sections of the specifications RxOUT, STATUS.......................-0.3V to (V + 0.3V) below is not implied. Exposure to absolute maximum CC rating conditions for extended periods of time may Short-Circuit Duration TxOUT.....................................................Continuous affect reliability and cause permanent damage to the Storage Temperature......................-65°C to +50°C device. V .......................................................-0.3V to +6.0V VC+C (NOTE ).......................................-0.3V to +7.0V Power Dissipation per package V- (NOTE )........................................+0.3V to -7.0V V+ + |V-| (NOTE )...........................................+3V 20-pin SSOP (derate 9.25mW/oC above +70oC)..750mW I (DC V or GND current).........................+00mA 20-pin TSSOP (derate .mW/oC above +70oC..900mW CC CC Input Voltages TxIN, ONLINE, SHUTDOWN, EN......................-0.3V to VCC + 0.3V RxIN...................................................................+5V NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 3V. ELECTRICAL CHARACTERISTICS Unless otherwise noted, the following specifications apply for V = +3.0V to +5.5V with T = T to T . CC AMB MIN MAX Typical values apply at V = +3.3V or +5.0V and T = 25°C (Note 2). CC AMB PARAMETER MIN. TYP. MAX. UNITS CONDITIONS DC CHARACTERISTICS All RxIN open, ONLINE = GND, SHUTDOWN = Vcc, TxIN = Vcc or Supply Current, .0 0 µA GND, Vcc = +3.3V, T = +25ºC AMB AUTO ON-LINE® SHUTDOWN = GND, TxIN = Supply Current, Shutdown .0 0 µA Vcc or GND, Vcc = +3.3V, T = AMB +25ºC Supply Current, 0.3 .0 mA ONLINE = SHUTDOWN = Vcc, No AUTO ON-LINE® Disabled Load, Vcc = +3.3V, T = +25ºC AMB LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Vcc = 3.3V or 5.0V, LOW GND 0.8 V TxIN, EN, SHUTDOWN, ONLINE HIGH 2.0 Vcc Input Leakage Current +/-0.0 +/-.0 µA TxIN, EN, ONLINE, SHUTDOWN, T = +25ºC, Vin = 0V to Vcc AMB Output Leakage Current +/-0.05 +/-0 µA Receivers disabled, Vout = 0V to Vcc Output Voltage LOW 0.4 V I = .6mA OUT Output Voltage HIGH Vcc - 0.6 Vcc - 0. V I = -.0mA OUT NOTE 2: C1 - C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2-C4 = 0.33µF, tested at 5V±10%. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 2

ELECTRICAL CHARACTERISTICS Unless otherwise noted, the following specifications apply for V = +3.0V to +5.5V with T = T to T . CC AMB MIN MAX Typical values apply at V = +3.3V or +5.0V and T = 25°C (Note 2). CC AMB PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Driver Outputs All Driver outputs loaded with 3kΩ +/-5.0 +/-5.4 V to GND, T = +25ºC AMB Output Voltage Swing Output Resistance 300 Ω Vcc = V+ = V- = 0V, Vout = +/-2V Output Short-Circuit Current +/-35 +/-60 mA Vout = 0V Output Leakage Current +/-25 µA Vcc = 0V or 3.0V to 5.5V, Vout = +/-2V, Driver disabled RECEIVER INPUTS -5 +5 V Input Voltage Range Input Threshold LOW 0.6 .2 V Vcc = 3.3V Input Threshold LOW 0.8 .5 V Vcc = 5.0V Input Threshold HIGH .5 2.4 V Vcc = 3.3V Input Threshold HIGH .8 2.4 V Vcc = 5.0V Input Hysteresis 0.3 V Input Resistance 3 5 7 k Ω AUTO ON-LINE® CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = Vcc) STATUS Output Voltage LOW 0.4 V I = .6mA OUT STATUS Output Voltage HIGH Vcc - 0.6 V I = -.0mA OUT Receiver Threshold to Drivers 200 µs Figure 5 Enabled (t ) ONLINE Receiver Positive or Negative 0.5 µs Figure 5 Threshold to STATUS HIGH (t ) STSH Receiver Positive or Negative 20 µs Figure 5 Threshold to STATUS LOW (t ) STSL NOTE 2: C1 - C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2-C4 = 0.33µF, tested at 5V±10%. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 3

TIMING CHARACTERISTICS Unless otherwise noted, the following specifications apply for V = +3.0V to +5.5V with T = T to T . CC AMB MIN MAX Typical values apply at V = +3.3V or +5.0V and T = 25°C. CC AMB PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Maximum Data Rate SP3223E 20 235 RL = 3kΩ, C = 000pF, One L Driver active SP3223EB 250 kbps SP3223EU 000 RL = 3kΩ, C = 250pF, One Driver L active Receiver Propagation Delay t and t 0.5 µA Receiver input to Receiver output, PHL PLH C = 50pF L Receiver Output Enable Time 200 ns Normal Operation Receiver Output Disable Time 200 ns Normal Operation Driver Skew E, EB 00 500 ns │t - t │, T = 25°C PHL PLH AMB EU 50 00 ns Receiver Skew E, EB, EU 200 000 ns │t - t │ PHL PLH Transition-Region Slew Rate E, EB 30 Vcc = 3.3V, RL = 3kΩ, T = AMB V/µs 25°C, measurements taken from EU 90 -3.0V to +3.0V or +3.0V to -3.0V Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 4

TYPICAL OPERATING CIRCUIT Figure . SP3223E Typical Operating Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 5

TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, the following performance characteristics apply for V = +3.3V, 250Kbps data rate, all CC drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T = +25°C. AMB 6 30 4 TxOUT + 25 - Slew + Slew 2 20 0 15 -2 10 1 Transmitter at 250Kbps TxOUT - 1 Transmitter at 15.6Kbps -4 5 All drivers loaded 3K + Load Cap -6 0 0 1000 2000 3000 4000 5000 0 500 1000 2000 3000 4000 5000 Load Capacitance (pF) Load Capacitance (pF) Figure 2. Transmitter Output Voltage VS. Load Figure 3. Slew Rate VS. Load Capacitance for the Capacitance for the SP3223EB SP3223EB 35 20 30 25 250Kbps 15 20 125Kbps 10 15 20Kbps 10 1 Transmitter at 250Kbps 5 11 TTrraannssmmiitttteerr aatt 21550.6KKbbppss 5 2A lTl rdarnivsemrsit tloearsd eadt 1w5i.t6hK 3bKp s// 1000pF All drivers loaded 3K + Load Cap 0 0 0 1000 2000 3000 4000 5000 2.7 3 3.5 4 4.5 5 Load Capacitance (pF) SSuuppppllyy VVooltlataggee ( V(VdcD)C) Figure 4. Supply Current VS. Load Capacitance Figure 5. Supply Current VS. Supply Voltage for when Transmitting Data for the SP3223EB the SP3223EB 6 TxOUT + 4 2 0 -2 -4 TxOUT - -6 2.7 3 3.5 4 4.5 5 SSuuppppllyy VVooltlatagge e(V (dVcD)C) Figure 6. Transmitter Output Voltage VS. Supply Voltage for the SP3223EB Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 6

TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, the following performance characteristics apply for V = +3.3V, 000Kbps data rate, all CC drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T = +25°C. AMB 200 6 4 150 2 1Driver at 1Mbps 100 0 Other Drivers at 62.5Kbps All Drivers Loaded with 3K // 250pF -2 50 T1 at 500Kbps T2 at 31.2Kbps All TX loaded 3K // CLoad -4 0 -6 0 250 500 1000 1500 2000 2.7 3 3.5 4 4.5 5 Load Capacitance (pF) Supply Voltage (V) Supply Voltage (V) Figure 7. Transmitter Skew VS. Load Capacitance Figure 8. Transmitter Output Voltage VS. Supply for the SP3223EU Voltage for the SP3223EU 6 35 4 30 T1 at 1Mbps 25 2 T2 at 62.5Kbps 20 0 15 -2 T1 at 1Mbps 10 T2 at 62.5Kbps -4 5 -6 0 0 250 500 1000 1500 0 250 500 1000 1500 Load Capacitance (pF) Load Capacitance (pF) Figure 9. Transmitter Output Voltage VS. Load Figure 0. Supply Current VS. Load Capacitance for Capacitance for the SP3223EU the SP3223EU 20 6 4 15 2 T1 at 1Mbps 10 0 T2 at 62.5Kbps T1 at 1Mbps All Drivers loaded T2 at 62.5Kbps -2 with 3K//250pF All Drivers loaded 5 with 3K//250pF -4 0 -6 2.7 3 3.5 4 4.5 5 2.7 3 3.5 4 4.5 5 SSupupplpyl yV Vooltlataggee ( V(V)) SSuupppplyly V Voollttaaggee ((VV)) Figure . Supply Current VS. Supply Voltage for Figure 2. Transmitter Output Voltage VS. Supply the SP3223EU Voltage for the SP3223EU Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 7

PIN DESCRIPTION Name Function Pin # Receiver Enable, Apply logic LOW for normal operation. Apply logic HIGH to EN  disable receiver outputs (high-Z state). C+ Positive terminal of the voltage doubler charge-pump capacitor 2 V+ Regulated +5.5V output generated by charge pump 3 C- Negative terminal of the voltage doubler charge-pump capacitor 4 C2+ Positive terminal of the inverting charge-pump capacitor 5 C2- Negative terminal of the inverting charge-pump capacitor 6 V- Regulated -5.5V output generated by charge pump 7 TOUT RS-232 Driver output 8 2 RIN RS-232 receiver input 9 2 ROUT TTL/CMOS receiver output 0 2 STATUS TTL/CMOS output indicating online and shutdown status  TIN TTL/CMOS driver input 2 2 TIN TTL/CMOS driver input 3  Apply logic HIGH to override AUTO ON-LINE ® circuitry keeping drivers active ONLINE 4 (SHUTDOWN must also be logic HIGH, refer to table 2). ROUT TTL/CMOS receiver output 5  RIN RS-232 receiver input 6  TOUT RS-232 Driver output 7  GND Ground 8 Vcc +3.0V to +5.5V supply voltage 9 Apply logic LOW to shut down drivers and charge pump. This overrides all SHUTDOWN 20 AUTO ON-LINE ® circuitry and ONLINE (refer to table 2). Table 2. Pin Description Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 8

DESCRIPTION The SP3223 is a 2-driver/2-receiver device THEORY OF OPERATION ideal for portable or handheld applications. The SP3223 series is made up of four basic The SP3223 transceivers meet the EIA/TIA- circuit blocks: 232 and ITU-T V.28/V.24 communication . Drivers, 2. Receivers, 3. The Exar pro- protocols and can be implemented in battery- prietary charge pump, and 4. AUTO ON- powered, portable, or handheld applications LINE® circuitry. such as notebook or handheld computers. The SP3223 devices feature Exar's propri- Drivers etary on-board charge pump circuitry that The drivers are inverting level transmitters generates ±5.5V RS-232 voltage levels from that convert TTL or CMOS logic levels to 5.0V a single +3.0V to +5.5V power supply. EIA/TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the These devices are an ideal choice for power RS-232 output voltage swing is +5.4V with sensitive designs. Featuring AUTO ON-LINE® no load and +5V minimum fully loaded. The circuitry, the SP3223 reduces the power sup- driver outputs are protected against infinite ply drain to a µA supply current. In many short-circuits to ground without degrada- portable or handheld applications, an RS-232 tion in reliability. These drivers comply with cable can be disconnected or a connected the EIA-TIA-232F and all previous RS-232 peripheral can be turned off. Under these versions. Unused driver inputs should be conditions, the internal charge pump and connected to GND or V . the drivers will be shut down. Otherwise, the CC system automatically comes online. This The drivers can guarantee output data feature allows design engineers to address rates fully loaded with 3kΩ in parallel with power saving concerns without major design 000pF, (SP3223EU, C = 250pF) ensuring changes. L compatibility with PC-to-PC communication software. VCC The slew rate of the driver output on the C5 +0.1µF VC1C9 E and EB versions is internally limited to a C1 +0.1µF 2C1+ V+ 3 C3 +0.1µF maximum of 30V/µs in order to meet the EIA 4C1- 5C2+ SP3223E V- 7 standards (EIA RS-232D 2..7, Paragraph 5). C2 +0.1µF 6C2- C4 +0.1µF The Slew Rate of EU version is not limited to enable higher speed data transfers. The TTL/CMOS INPUTS 1121TT12IINN TT12OOUUTT 187 ORUS-T2P3U2TS transition of the loaded output from HIGH to UART LOW also meets the monotonicity require- or 15R1OUT R1IN 16 Serial µC TTL/CMOS OUTPUTS10R2OUT 5KΩ R2IN 9 RINSP-U23T2S ments of the standard. 5KΩ Figure 4 shows a loopback test circuit used EN to test the RS-232 Drivers. Figure 15 shows VCC 20SHUTDOWN the test results where one driver was active 14ONLINE at 250kbps and all drivers are loaded with 11STATUS GND 18 an RS-232 receiver in parallel with a 000pF RESET SupeµrPvisor VIN capacitor. RS-232 data transmission rate of IC 20kbps to Mbps provide compatibility with designs in personal computer peripherals and LAN applications. Figure 3. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 9

Device: SP3223 SHUTDOWN EN T OUT R OUT X X 0 0 High Z Active 0  High Z High Z  0 Active Active   Active High Z Table 3. SHUTDOWN and EN Truth Tables Note: In AUTO ON-LINE® Mode where ONLINE = GND and SHUTDOWN = V , the device will shut down if CC there is no activity present at the Receiver inputs. Receivers The receivers convert ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. Receivers have an inverting output that can be disabled by using the EN pin. Figure 4. Loopback Test Circuit for RS-232 Driver Data Transmission Rates Receivers are active when the AUTO ON- LINE® circuitry is enabled or when in shut- down. During the shutdown, the receivers will continue to be active. If there is no activity present at the receivers for a period longer than 00µs or when SHUTDOWN is enabled, the device goes into a standby mode where the circuit draws µA. Driving EN to a logic HIGH forces the outputs of the receivers into high-impedance. The truth table logic of the SP3223 driver and receiver outputs can be found in Table 2. Figure 5. Loopback Test Circuit result at 250Kbps (All Drivers Fully Loaded) Since receiver input is usually from a trans- mission line where long cable lengths and Charge Pump system interference can degrade the signal, The charge pump uses a unique approach the inputs have a typical hysteresis margin compared to older less–efficient designs. of 300mV. This ensures that the receiver The charge pump still requires four external is virtually immune to noisy transmission capacitors, but uses a four–phase voltage lines. Should an input be left unconnected, shifting technique to attain symmetrical an internal 5kΩ pull-down resistor to ground 5.5V power supplies. The internal power will commit the output of the receiver to a supply consists of a regulated dual charge HIGH state. pump that provides output voltages of +/-5.5V regardless of input voltage (V ) CC over the +3.0V to +5.5V range. This is important to maintain compliant RS- 232 levels regardless of power supply fluctuations. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 0

The charge pump operates in a discontinu- as the operational conditions for the internal ous mode using an internal oscillator. If the oscillator are present. output voltages are less than a magnitude of 5.5V, the charge pump is enabled. If the Since both V+ and V– are separately gener- output voltages exceed a magnitude of 5.5V, ated from V , in a no–load condition V+ CC the charge pump is disabled. This oscillator and V– will be symmetrical. Older charge controls the four phases of the voltage shift- pump approaches that generate V– from ing. A description of each phase follows. V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent Phase 1 inefficiencies in the design. — V charge storage — During this phase SS of the clock cycle, the positive side of capaci- tors C and C are initially charged to V . The Exar charge pump is designed to  2 CC C+ is then switched to GND and the charge operate reliably with a range of low cost l in C – is transferred to C –. Since C + is con- capacitors. Either polarized or non polar-  2 2 nected to V , the voltage potential across ized capacitors may be used. If polarized CC capacitor C is now 2 times V . 2 CC capacitors are used they should be oriented as shown in the Typical Operating Circuit. Phase 2 The V+ capacitor may be connected to either — V transfer — Phase two of the clock SS ground or Vcc (polarity reversed.) connects the negative terminal of C to the V 2 SS storage capacitor and the positive terminal of C to GND. This transfers a negative gener- The charge pump operates with 0.µF 2 ated voltage to C . This generated voltage is capacitors for 3.3V operation. For other 3 regulated to a minimum voltage of -5.5V. supply voltages, see table 4 for required Simultaneous with the transfer of the volt- capacitor values. Do not use values smaller age to C , the positive side of capacitor C than those listed. Increasing the capacitor 3  is switched to V and the negative side is values (e.g., by doubling in value) reduces CC connected to GND. ripple on the transmitter outputs and may slightly reduce power consumption. C2, C3, Phase 3 and C4 can be increased without changing — V charge storage — The third phase of DD C’s value. the clock is identical to the first phase — the charge transferred in C produces –V in  CC For best charge pump efficiency locate the the negative terminal of C , which is applied to the negative side of capacitor C . Since charge pump and bypass capacitors as 2 C + is at V , the voltage potential across C close as possible to the IC. Surface mount 2 CC 2 is 2 times V . capacitors are best for this purpose. Using CC capacitors with lower equivalent series re- Phase 4 sistance (ESR) and self-inductance, along — V transfer — The fourth phase of with minimizing parasitic PCB trace induc- DD the clock connects the negative terminal tance will optimize charge pump operation. of C to GND, and transfers this positive 2 Designers are also advised to consider that generated voltage across C to C , the 2 4 capacitor values may shift over time and V storage capacitor. This voltage is DD operating temperature. regulated to +5.5V. At this voltage, the in- ternal oscillator is disabled. Simultaneous with the transfer of the voltage to C , the 4 positive side of capacitor C is switched to V  CC and the negative side is switched to GND, al- lowing the charge pump cycle to begin again. The charge pump cycle will continue as long Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 

VCC = +5V +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –5V –5V C3 Figure 6. Charge Pump - Phase  VCC = +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –10V C3 Figure 7. Charge Pump - Phase 2 [ T ] +6V a) C2+ 1 T 0V 2 2 0V b) C2- T -6V Ch1 2.00V Ch2 2.00V M 1.00ms Ch1 1.96V Figure 8. Charge Pump Waveforms VCC = +5V +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –5V –5V C3 Figure 9. Charge Pump - Phase 3 VCC = +5V +10V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor C3 Figure 20. Charge Pump - Phase 4 Minimum recommended charge pump capacitor value Input Voltage V Charge pump capacitor value CC 3.0V to 3.6V C - C4 = 0.µF 4.5V to 5.5V C = 0.047µF, C2-C4 = 0.33µF 3.0V to 5.5V C - C4 = 0.22µF Table 4. Minimum Charge Pump Capacitor values Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 2

The second stage of the AUTO ON-LINE® AUTO ON-LINE® Circuitry circuitry, shown in Figure 23, processes the receiver's R INACT signal with an ac- X The SP3223 device has AUTO ON-LINE® cumulated delay that disables the device to circuitry on board that saves power in ap- a µA typical supply current. The STATUS plications such as laptop computers, PDA's, pin goes to a logic LOW when the cable and other portable systems. is disconnected, the external transmit- ter is disabled, or the SHUTDOWN pin is The SP3223 device incorporates an AUTO invoked. The typical accumulated delay ON-LINE® circuit that automatically enables is around 20µs. When the SP3223 drivers itself when the external transmitter is enabled and internal charge pump are disabled, the and the cable is connected. Conversely, supply current is reduced to µA typical. the AUTO ON-LINE® circuit also disables This can commonly occur in handheld or most of the internal circuitry when the device portable applications where the RS-232 is not being used and goes into a standby cable is disconnected or the RS-232 drivers mode where the device typically draws µA. of the connected peripheral are truned off. This function is externally controlled by the The AUTO ON-LINE® mode can be disabled ONLINE pin. When this pin is tied to a logic by the SHUTDOWN pin. If this pin is a logic LOW, the AUTO ON-LINE® function is ac- LOW, the AUTO ON-LINE® function will not tive. Once active, the device is enabled until operate regardless of the logic state of the there is no activity on receiver inputs. The ONLINE pin. Table 5 summarizes the logic receiver input typically sees at least ±3V, of the AUTO ON-LINE® operating modes. which are generated from the transmitter The truth table logic of the SP3223 driver and at the other end of the cable with a ±5V receiver outputs can be found in Table 3. minimum. When the external transmitter is disabled or the cable is disconnected, the The STATUS pin outputs a logic LOW signal receiver input will be pulled down by its if the device is shutdown. This pin goes to internal 5kΩ resistor to ground. When this a logic HIGH when the external transmitter occurs over a period of time, the internal is enabled and the cable is connected. transmitters will be disabled and the device goes into a shutdown or standby mode. When the SP3223 device is shutdown, the When the ONLINE pin is HIGH, the AUTO charge pumps are turned off. V+ charge ON-LINE® mode is disabled. pump output decays to V ,the V- output CC decays to GND. The decay time will depend The AUTO ON-LINE® circuit has two on the size of capacitors used for the charge stages: pump. Once in shutdown, the time required to exit the shut down state and have valid ) Inactive Detection V+ and V- levels is typically 200µs. 2) Accumulated Delay For easy programming, the STATUS can The first stage, shown in Figure 22, detects be used to indicate DTR or a Ring Indicator an inactive input. A logic HIGH is asserted signal. Tying ONLINE and SHUTDOWN on R INACT if the cable is disconnected together will bypass the AUTO ON-LINE® X or the external transmitters are disabled. circuitry so this connection acts like a shut- Otherwise, R INACT will be at a logic LOW. down input pin X This circuit is duplicated for each of the other receivers. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 3

S H U RECEIVER +2.7V T RS-232 INPUT 0V VOLTAGES -2.7V D O W VCC N STATUS 0V tSTSL tSTSH tONLINE +5V DRIVER RS-232 OUTPUT 0V VOLTAGES -5V Figure 2. AUTO ON-LINE® Timing Waveforms RS-232 SIGNAL TRANSCEIVER AT RECEIVER SHUTDOWN ONLINE STATUS STATUS INPUT Normal Operation YES HIGH LOW HIGH (AUTO ON-LINE©) NO HIGH HIGH LOW Normal Operation Shutdown NO HIGH LOW LOW (AUTO ON-LINE©) YES LOW HIGH/LOW HIGH Shutdown NO LOW HIGH/LOW LOW Shutdown Table 5. AUTO ON-LINE® Logic Inactive Detection Block RXINACT RS-232 RXIN Receiver Block RXOUT Figure 22. Stage I of AUTO ON-LINE® Circuitry Delay Delay Buffer Buffer INACTIVE R1ON R2ON SHUTDOWN Figure 23. Stage II of AUTO ON-LINE® Circuitry Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 4

ESD TOLERANCE is applied to points and surfaces of the equipment that are accessible to personnel The SP3223 series incorporates during normal usage. The transceiver IC ruggedized ESD cells on all driver output receives most of the ESD current when the and receiver input pins. The ESD structure is ESD source is applied to the connector pins. improved over our previous family for more The test circuit for IEC6000-4-2 is shown rugged applications and environments on Figure 25. There are two methods within sensitive to electro-static discharges and IEC6000-4-2, the Air Discharge method and associated transients. The improved ESD the Contact Discharge method. With the Air tolerance is at least +5kV without damage Discharge Method, an ESD voltage is applied nor latch-up. to the equipment under test (EUT) through air. This simulates an electrically charged There are different methods of ESD testing person ready to connect a cable onto the applied: rear of the system only to find an unpleas- a) MIL-STD-883, Method 305.7 b) IEC6000-4-2 Air-Discharge ant zap just before the person touches the c) IEC6000-4-2 Direct Contact back panel. The high energy potential on the The Human Body Model has been the person discharges through an arcing path generally accepted ESD testing method to the rear panel of the system before he or for semiconductors. This method is also she even touches the system. This energy, specified in MIL-STD-883, Method 3015.7 whether discharged directly or through air, for ESD testing. The premise of this ESD test is predominantly a function of the discharge is to simulate the human body’s potential to current rather than the discharge voltage. store electro-static energy and discharge it Variables with an air discharge such as to an integrated circuit. The simulation is approach speed of the object carrying the performed by using a test model as shown ESD potential to the system and humidity in Figure 24. This method will test the IC’s will tend to change the discharge current. capability to withstand an ESD transient For example, the rise time of the discharge during normal handling such as in manu- current varies with the approach speed. facturing areas where the IC's tend to be The Contact Discharge Method applies the handled frequently. ESD current directly to the EUT. This method was devised to reduce the unpredictability The IEC-6000-4-2, formerly IEC80-2, is of the ESD arc. The discharge current rise generally used for testing ESD on equipment time is constant since the energy is directly and systems. For system manufacturers, transferred without the air-gap arc. In situ- they must guarantee a certain amount of ations such as hand held systems, the ESD ESD protection since the system itself is ex- charge can be directly discharged to the posed to the outside environment and human equipment from a person already holding presence. The premise with IEC6000-4-2 the equipment. The current is transferred is that the system is required to withstand on to the keypad or the serial port of the an amount of static electricity when ESD equipment directly and then travels through the PCB and finally to the IC. Figure 24. ESD Test Circuit for Human Body Model Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 5

Figure 25. ESD Test Circuit for IEC6000-4-2 The circuit model in Figures 24 and 25 rep- resent the typical ESD testing circuit used for all three methods. The C is initially charged → S with the DC power supply when the first i 30A switch (SW) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW switches off. The voltage stored in the capacitor is then applied through R , the current limiting resistor, onto the devicSe 5A under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. 0A For the Human Body Model, the current limiting resistor (R ) and the source capacitor (C ) are 1.5kΩ anS 100pF, respectively. For t=0ns t=30ns S t → IEC-6000-4-2, the current limiting resistor (R ) and the source capacitor (C ) are 330Ω Figure 26. ESD Test Waveform for IEC6000-4-2 S S an 50pF, respectively. The higher C value and lower R value in S S the IEC6000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point. DEVICE PIN HUMAN BODY IEC61000-4-2 TESTED MODEL Air Discharge Direct Contact Level Driver Outputs ±15kV ±15kV ±8kV 4 Receiver Inputs ±15kV ±15kV ±8kV 4 Table 6. Transceiver ESD Tolerance Levels Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 6

PACKAGE: 20 Pin TSSOP Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 7

PACKAGE: 20 Pin SSOP Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 8

ORDERING INFORMATION Part Number Temperature Range Package Types SP3223EBCA-L ...................................................0°C to +70°C --------------------------------------------20-pin SSOP SP3223EBCA-L/TR .............................................0°C to +70°C --------------------------------------------20-pin SSOP SP3223EBCY-L ...................................................0°C to +70°C -------------------------------------------20-pin TSSOP SP3223EBCY-L/TR .............................................0°C to +70°C -------------------------------------------20-pin TSSOP SP3223EBEA-L .................................................-40°C to +85°C -------------------------------------------20-pin SSOP SP3223EBEA-L/TR ...........................................-40°C to +85°C -------------------------------------------20-pin SSOP SP3223EBEY-L .................................................-40°C to +85°C ------------------------------------------20-pin TSSOP SP3223EBEY-L/TR ...........................................-40°C to +85°C ------------------------------------------20-pin TSSOP SP3223ECA-L .....................................................0°C to +70°C .....................................................20-pin SSOP SP3223ECA-L/TR ...............................................0°C to +70°C .....................................................20-pin SSOP SP3223ECY-L .....................................................0°C to +70°C ...................................................20-pin TSSOP SP3223ECY-L/TR ...............................................0°C to +70°C ...................................................20-pin TSSOP SP3223EEA-L ...................................................-40°C to +85°C ....................................................20-pin SSOP SP3223EEA-L/TR .............................................-40°C to +85°C ....................................................20-pin SSOP SP3223EEY-L ....................................................-40°C to +85°C ..................................................20-pin TSSOP SP3223EEY-L/TR ..............................................-40°C to +85°C ..................................................20-pin TSSOP SP3223EUCA-L ..................................................0°C to +70°C .....................................................20-pin SSOP SP3223EUCA-L/TR ............................................0°C to +70°C .....................................................20-pin SSOP SP3223EUCY-L ...................................................0°C to +70°C ...................................................20-pin TSSOP SP3223EUCY-L/TR .............................................0°C to +70°C ...................................................20-pin TSSOP SP3223EUEA-L .................................................-40°C to +85°C ....................................................20-pin SSOP SP3223EUEA-L/TR ...........................................-40°C to +85°C ....................................................20-pin SSOP SP3223EUEY-L .................................................-40°C to +85°C ..................................................20-pin TSSOP SP3223EUEY-L/TR ...........................................-40°C to +85°C ..................................................20-pin TSSOP Note: "-L" indicates lead free packaging, "/TR" is for tape and reel option PRODUCT NOMENCLATURE SP3223 E U EY L /TR Tape and Reel options “L” suffix indicates Lead Free packaging Package Type A= SSOP Y=TSSOP Part Number Temperature Range C= Commercial Range 0ºc to 70ºC E= Extended Range -40ºc to 85ºC Speed Indicator Blank= 120Kbps B= 250Kbps U= 1Mbps ESD Rating E= 15kV HBM and IEC 1000-4 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 9

REVISION HISTORY DATE REVISION DESCRIPTION 0-06-06 --- Legacy Sipex data sheet Nov 200 .0.0 Convert to Exar data sheet format and remove EOL parts. June 202 .0. Correct type error on page  pin diagram. Pin 9 should be R2IN not RIN, Change ESD protection levels to IEC6000-4-2. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 202 EXAR Corporation Datasheet June 202 For technical support please email Exar's Serial Technical Support group at: serialtechsupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 20

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: E xar: SP3223ECY-L SP3223EEA-L SP3223EEY-L SP3223ECA-L SP3223ECA-L/TR SP3223EUEY-L SP3223EBCY- L/TR SP3223EEA-L/TR SP3223EUEA-L SP3223EBCY-L SP3223ECY-L/TR SP3223EEY-L/TR SP3223EUCA-L SP3223EBEY-L SP3223EUEY-L/TR SP3223EBCA-L/TR SP3223EUEA-L/TR SP3223EUCY-L SP3223EBEA-L SP3223EUCY-L/TR SP3223EUCA-L/TR SP3223EBEA-L/TR SP3223EBCA-L SP3223EBEY-L/TR