SP3203E 3V RS-232 Serial Transceiver with Logic Selector and 15kV ESD Protection FEATURES • 3 Driver / 2 Receiver Architecture C1+ 1 20 SHUTDOWN • Logic selector function (V ) sets TTL L V+ 2 19 Vcc input/output levels for mixed logic systems C1- 3 18 GND • Meets true EIA/TIA-232-F Standards from C2+ 4 17 TOUT 1 a +3.0V to +5.5V power supply C2- 5 SP3203E 16 TOUT • Interoperable with EIA/TIA-232 and 2 adheres to EIA/TIA-562 down to a +2.7V V- 6 15 T3OUT power source TIN 7 14 RIN 1 1 • Minimum 250Kbps data rate under load TIN 8 13 RIN • Regulated Charge Pump Yields Stable 2 2 RS-232 Outputs Regardless of V T3IN 9 12 VL CC Variations ROUT 10 11 ROUT 2 1 • ESD Specifications: +5KV Human Body Model +5KV IEC6000-4-2 Air Discharge Now Available in Lead Free Packaging +8KV IEC6000-4-2 Contact Discharge • Applications • Palmtops • Cell phone Data Cables • PDA's DESCRIPTION The SP3203E provides a RS-232 transceiver solution for portable and hand-held applications such as palmtops, PDA's and cell phones. The SP3203E uses an internal high-efficiency, charge-pump power supply that requires only 0.µF capacitors during 3.3V operation. This charge pump and Exar's driver architecture allow the SP3203E to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. The SP3203E is a 3-driver/2-receiver device, with a unique V pin to program the TTL input L and output logic levels to allow inter operation in mixed-logic voltage systems such as PDA's and cell phones. Receiver outputs will not exceed V for V and transmitter input logic levels L OH are scaled by the magnitude of the V input. L Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 

ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may Output Voltages TxOUT.............................................................+3.2V affect reliability and cause permanent damage to the RxOUT, .......................................-0.3V to (V + 0.3V) device. L V .......................................................-0.3V to +6.0V Short-Circuit Duration CC TxOUT......................................................Continuous V+ (NOTE ).......................................-0.3V to +7.0V Storage Temperature.......................-65°C to +50°C V- (NOTE )........................................+0.3V to -7.0V V+ + |V-| (NOTE )...........................................+3V I (DC V or GND current).........................+00mA Power Dissipation per package CC CC Input Voltages TxIN, SHUTDOWN .........................-0.3V to VL+0.3V 20-pin TSSOP (derate 7.0mW/oC above +70oC..560mW RxIN...................................................................+25V NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 3V. ELECTRICAL CHARACTERISTICS V = V = +3.0V to +5.5V, C - C4 = 0.µF, tested at +3.3V +/-0%, C = 0.047µF, C2 - C4 = 0.33µF, tested at CC L +5.0V +/-0%, T = T to T , unless otherwise noted. Typical values are at Vcc = V = 3.3V, T = +25ºC. AMB MIN MAX L A PARAMETER MIN. TYP. MAX. UNITS CONDITIONS DC CHARACTERISTICS (Vcc = +3.3V or +5V, TA = +25ºC) Supply Current 0.3  mA SHUTDOWN = Vcc, No Load Supply Current, Shutdown .0 0.0 µA SHUTDOWN = GND LOGIC INPUTS 0.8 V V = 3.3V or Input Logic Threshold Low TxIN , 5.L0V SHUTDOWN 0.6 V V = 2.5V L 2.4 V = 5.0V L Input Logic Threshold High 2.0 V TxIN , VL = 3.3V .4 SHUTDOWN V = 2.5V L 0.9 V = .8V L Transmitter Input Hysteresis 0.5 V Input Leakage Current +/-0.0 +/-.0 µA TxIN, SHUTDOWN RECEIVER OUTPUTS Output Leakage Current +/-0.05 +/-0 µA RxOUT, receivers disabled Output Voltage LOW 0.4 V I = .6mA OUT Output Voltage HIGH V - 0.6 V - 0. V I = -.0mA L L OUT Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 2

ELECTRICAL CHARACTERISTICS V = V = +3.0V to +5.5V, C - C4 = 0.µF, tested at +3.3V +/-0%, C = 0.047µF, C2 - C4 = 0.33µF, tested at CC L +5.0V +/-0%, T = T to T , unless otherwise noted. Typical values are at Vcc = V = 3.3V, T = +25ºC. AMB MIN MAX L A PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RECEIVER INPUTS Input Voltage Range -25 +25 V 0.8 .5 V V = 5.0V Input Threshold Low T = +25ºC L 0.6 .2 V A V = 2.5V or 3.3V L .8 2.4 V V = 5.0V Input Threshold High T = +25ºC L .5 2.4 V A V = 2.5V or 3.3V L Input Hysteresis 0.5 V Input Resistance 3 5 7 k Ω TRANSMITTER OUTPUTS Output Voltage Swing +/-5.0 +/-5.4 V All transmitter outputs loaded with 3kΩ to GND, T = +25ºC AMB Output Resistance 300 0M Ω Vcc = V+ = V- = 0V, Vout = +/-2V Output Short-Circuit Current +/-60 mA Vout = 0V Output Leakage Current +/-25 µA Vcc = 0V or 3.0V to 5.5V, Vout = +/-2V, Driver disabled ESD PROTECTION +/-5 kV Human Body Model RxIN, TxOUT +/-5 kV IEC 6000-4-2 Air Gap Discharge +/-8 kV IEC 6000-4-2 Contact Discharge Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 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 250 kbps R = 3kΩ, C = 000pF, L L one transmitter switching Receiver Propagation Delay, tPHL 0.5 µs Receiver input to Receiver output, Receiver Propagation Delay, tPLH 0.5 CL = 50pF Receiver Output Enable Time 200 ns Normal Operation Receiver Output Disable Time 200 ns Normal Operation Time To Exit Shutdown 00 µs │V │> 3.7V TxOUT Transmitter Skew │t - t │ 00 ns (Note 2) PHL PLH Receiver Skew │t - t │ 50 ns PHL PLH C = 50pF to Vcc = 3.3V, 6 30 0L00pF TAMB = 25°C, RL = 3KΩ to 7KΩ, measure- Transition-Region Slew Rate V/µs ments taken from -3.0V to 4 30 CL = 50pF to +3.0V or +3.0V 2500pF to -3.0V Note 2. Transmitter skew is measured at the transmitter zero crosspoint. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 4

TYPICAL OPERATING CIRCUIT +3V to +5.5V + 20 19 12 C5 0.1µF Shutdown VCC VL 1 C1+ 2 V+ + + C1 0.1µF C3 0.1µF 3 C1- 4 C2+ SP3203E 6 V- + C2 0.1µF C4 0.1µF 5 C2- + 7 T IN T OUT 17 1 1 TTL/CMOS INPUTS 8 T IN T OUT 16 2 2 RS-232 OUTPUTS 9 T IN T OUT 15 3 3 11 R OUT R IN 14 1 1 5KΩ TTL/CMOS RS-232 OUTPUTS INPUTS 10 R OUT R IN 13 2 2 5KΩ GND 18 Figure . SP3203E Typical Operating Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 5

PIN DESCRIPTION Name Function Pin # C+ Positive terminal of the voltage doubler charge-pump capacitor  V+ Regulated +5.5V output generated by charge pump 2 C- Negative terminal of the voltage doubler charge-pump capacitor 3 C2+ Positive terminal of the inverting charge-pump capacitor 4 C2- Negative terminal of the inverting charge-pump capacitor 5 V- Regulated -5.5V output generated by charge pump 6 TIN TTL/CMOS driver input 7  TIN TTL/CMOS driver input 8 2 TIN TTL/CMOS driver input 9 3 ROUT TTL/CMOS receiver output 0 2 ROUT TTL/CMOS receiver output   V Logic-Level Supply Voltage Selection 2 L RIN RS-232 receiver input 3 2 RIN RS-232 receiver input 4  TOUT RS-232 Driver output 5 3 TOUT RS-232 Driver output 6 2 TOUT RS-232 Driver output 7  GND Ground 8 Vcc +3.0V to +5.5V supply voltage 9 SHUTDOWN Apply logic LOW to shut down drivers and charge pump. 20 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 6

DESCRIPTION Figure 2 shows a loopback test circuit used The SP3203E is a 3-driver/2-receiver device to test the RS-232 Drivers. Figure 3 shows ideal for portable or handheld applications. the test results with all drivers active at The SP3203E transceivers meet the EIA/ 20kbps with typical RS-232 loads in parallel TIA-232 and ITU-T V.28/V.24 communication with a 000pF capacitors. Figure 4 shows protocols and can be implemented in battery- the test results where one driver was active powered, portable, or handheld applications at 250kbps and all three drivers loaded with such as notebook or palmtop computers, an RS-232 receiver in parallel with a 000pF PDA's and cell phones. The SP3203E device capacitor. The transmitter inputs do not have features Exar's proprietary and patented pull-up resistors. Connect unused inputs to (U.S.-- 5,306,954) on-board charge pump ground or V . circuitry that generates ±5.5V RS-232 volt- L age levels from a single +3.0V to +5.5V power supply. The SP3203E can operate at Receivers a minimum data rate of 250kbps. The receivers convert ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. THEORY OF OPERATION Receivers are disabled when in shutdown. The truth table logic of the SP3203E driver The SP3203E is made up of four basic and receiver outputs can be found in Table circuit blocks: . . Drivers, 2. Receivers, 3. The Exar propri- etary charge pump, and 4. V circuitry. L Since receiver input is usually from a trans- mission line where long cable lengths and Drivers system interference can degrade the signal, The drivers are inverting level transmitters the inputs have a typical hysteresis margin that convert TTL or CMOS logic levels to 5.0V of 500mV. This ensures that the receiver EIA/TIA-232 levels with an inverted sense is virtually immune to noisy transmission relative to the input logic levels. Typically, the lines. Should an input be left unconnected, RS-232 output voltage swing is +5.4V with an internal 5kΩ pull-down resistor to ground no load and +5V minimum fully loaded. The will commit the output of the receiver to a driver outputs are protected against infinite HIGH state. short-circuits to ground without degradation in reliability. These drivers comply with the EIA-TIA-232F and all previous RS-232 ver- Charge Pump sions. The driver output stages are turned off (High Impedance) when the device is in The charge pump is a patented design (U.S. shutdown mode. 5,306,954) and uses a unique approach compared to older less–efficient designs. The drivers can guarantee output data rates The charge pump still requires four external capacitors, but uses a four–phase voltage fully loaded with 3kΩ in parallel with 1000pF, shifting technique to attain symmetrical ensuring compatibility with PC-to-PC com- 5.5V power supplies. The internal power munication software. supply consists of a regulated dual charge pump that provides output voltages of The slew rate of the driver output is internally +/-5.5V regardless of input voltage (V ) limited to a maximum of 30V/µs in order over the +3.0V to +5.5V range. ThCCis to meet the EIA standards (EIA RS-232D is important to maintain compliant RS- 2..7, Paragraph 5). The transition of the 232 levels regardless of power supply loaded output from HIGH to LOW also fluctuations. meets the monotonicity requirements of the standard. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 7

Phase 4 Device: SP3203E — V transfer — The fourth phase of DD the clock connects the negative terminal Charge SHUTDOWN T OUT R OUT of C to GND, and transfers this positive X X Pump 2 generated voltage across C to C , the 0 High-Z High-Z Inactive 2 4 V storage capacitor. This voltage is  Active Active Active reDgDulated to +5.5V. At this voltage, the in- ternal oscillator is disabled. Simultaneous Table 2. SHUTDOWN Truth Tables with the transfer of the voltage to C , the (Note: When the device is shutdown, the SP3203E's 4 positive side of capacitor C is switched to V charge pump is turned off and V+ decays to Vcc, V- is  CC pulled to ground and the transmitter outputs are disabled and the negative side is switched to GND, al- as High Impedance.) lowing the charge pump cycle to begin again. The charge pump cycle will continue as long 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 V Supply Level SS L of the clock cycle, the positive side of capaci- tors C and C are initially charged to V .  2 CC C+ is then switched to GND and the charge inl C – is transferred to C –. Since C + is con- +3V to +5V  2 2 nected to VCC, the voltage potential across C5 +0.1µF 19 capacitor C is now 2 times V . VCC 2 CC + 1C1+ V+ 2 + C1 0.1µF C3 0.1µF Phase 2 3C1- — V transfer — Phase two of the clock 4C2+ SP3203E V- 6 connSeScts the negative terminal of C to the V C2 +0.1µF 5C2- C4 + 0.1µF 2 SS storage capacitor and the positive terminal of T1IN T1OUT C to GND. This transfers a negative gener- TTL/CMOS 2 INPUTS ated voltage to C3. This generated voltage is TXIN TXOUT regulated to a minimum voltage of -5.5V. Simultaneous with the transfer of the volt- R1OUT R1IN age to C , the positive side of capacitor C TTL/CMOS 3  OUTPUTS 5KΩ is switched to V and the negative side is connected to GNCCD. RXOUT RXIN 5KΩ 1000pF 1000pF VCC Phase 3 20 SHUTDOWN — V charge storage — The third phase of DD 12 the clock is identical to the first phase — the V L charge transferred in C produces –V in GND +3V to +5.5V  CC 18 the negative terminal of C , which is applied to the negative side of capacitor C . Since Figure 2. Loopback Test Circuit for RS-232 Driver C + is at V , the voltage potential a2cross C Data Transmission Rates 2 CC 2 is 2 times V . CC Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 8

[ T ] Current RS-232 serial transceivers are designed with fixed 5V to 3.3V TTL input/ output voltage levels. The V function in the T L T1 IN1 SP3203E allows the end user to set the TTL input/output voltage levels independent of Vcc. By connecting V to the main logic bus T1 OUT2 L of system, the TTL input/output limits and T thresholds are reset to interface with the on T board low voltage logic circuitry. R1 OUT 3 Capacitor Selection Table: Ch1 5.00V Ch25.00V M 5.00msCh1 0V Ch3 5.00V Vcc (V) C (µF) C2 - C4 (µF) Figure 3. Loopback Test Circuit result at 20Kbps 3.0 to 3.6 0. 0. (All Drivers Fully Loaded) 4.5 to 5.5 0.047 0.33 [ T ] 3.0 to 5.5 0.22  T T1 IN1 T1 OUT2 T T R1 OUT 3 Ch1 5.00V Ch25.00V M 2.50msCh1 0V Ch3 5.00V Figure 4. Loopback Test Circuit result at 250Kbps (All Drivers Fully Loaded) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 9

VCC = +5V +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –5V –5V C3 Figure 5. Charge Pump - Phase  VCC = +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –10V C3 Figure 6. 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 7. Charge Pump Waveforms VCC = +5V +5V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor –5V –5V C3 Figure 8. Charge Pump - Phase 3 VCC = +5V +10V C4 + + + – VDD Storage Capacitor C1– C2– – + VSS Storage Capacitor C3 Figure 9. Charge Pump - Phase 4 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 0

+ 20 19 12 C5 0.1µF Shutdown VCC VL 1 C1+ 2 V+ + + C1 0.1µF C3 0.1µF 3 C1- 4 C2+ SP3203E 6 V- + C2 0.1µF C4 0.1µF 5C2- + 7 T1IN T1OUT 17 8 T2IN T2OUT 16 9 T3IN T3OUT 15 11R1OUT R1IN 14 10R2OUT R2IN 13 DB-9 Connector 1 6 2 GND 7 3 18 8 4 9 5 DB-9 Connector Pins: 1. Received Line Signal Detector 6. DCE Ready 2. Received Data 7. Request to Send 3. Transmitted Data 8. Clear to Send 4. Data Terminal Ready 9. Ring Indicator 5. Signal Ground (Common) Figure 0. Circuit for the connectivity of the SP3203E with a DB-9 connector Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 

ESD TOLERANCE is applied to points and surfaces of the equipment that are accessible to personnel The SP3203E incorporates ruggedized during normal usage. The transceiver IC ESD cells on all driver output and re- receives most of the ESD current when the ceiver 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 2. 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 . 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 . ESD Test Circuit for Human Body Model Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 2

Figure 2. ESD Test Circuit for IEC6000-4-2 The circuit model in Figures  and 2 repre- sent 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-000-4-2, the current limiting resistor (R ) and the source capacitor (C ) are 330Ω Figure 3. 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 ±5kV ±5kV ±8kV 4 Receiver Inputs ±5kV ±5kV ±8kV 4 Table 4. Transceiver ESD Tolerance Levels Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 3

PACKAGE: 20 Pin TSSOP Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 4

ORDERING INFORMATION Part Number Temperature Range Package Types SP3203ECY-L .....................................................0°C to +70°C -------------------------------------------20-pin TSSOP SP3203ECY-L/TR ...............................................0°C to +70°C -------------------------------------------20-pin TSSOP SP3203EEY-L ....................................................-40°C to +85°C ------------------------------------------20-pin TSSOP SP3203EEY-L/TR ..............................................-40°C to +85°C ------------------------------------------20-pin TSSOP Note: "-L" indicates lead free packaging, "/TR" is for tape and reel option Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3203E_00_2080 5

REVISION HISTORY DATE REVISION DESCRIPTION 03-0-05 --- Legacy Sipex datasheet Dec 200 .0.0 Convert to Exar datasheet format and remove EOL parts. 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 200 EXAR Corporation Datasheet December 200 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 SP3203E_00_2080 6