APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Features General Description • Precision Monitoring of +2.5V, +3V, +3.3V, and +5V The APX803 is used for microprocessor (µP) supervisory circuits Power-Supply Voltages to monitor the power supplies in µP and digital systems. They • Fully Specified Over Temperature provide excellent circuit reliability and low cost by eliminating • Available in three Output Configurations external components and adjustments when used with +5V, +3.3V, +3.0V powered circuits. • Open-drain RESET Active Low • 200ms Typ Power-On Reset Pulse Width These circuits perform a single function: they assert a reset • 30µA Supply Current (Typ.) signal on power up and whenever the V supply voltage CC • Guaranteed Reset Valid to VCC = +1V declines below a preset threshold, keeping it asserted for at least • No External Components 140ms after VCC has risen above the reset threshold. Reset • SOT23 and SOT23R: Available in “Green” Molding thresholds suitable for operation with a variety of supply voltages Compound (No Br, Sb) are available. The APX803 have an open collector active low • Lead Free Finish/ RoHS Compliant (Note 1) RESET output. The reset comparator is designed to ignore fast transients on V , and the outputs are guaranteed to be in CC the correct logic state for VCC down to 1V. Low supply current makes the APX803 ideal for use in portable equipment. The APX803 is available in two pin out variants of the 3-pin SOT23 and SOT23R packages. Applications • Computers • Controllers • Intelligent Instruments • Critical µP and µC Power Monitoring • Portable/Battery Powered Equipment Typical Application Circuit Vcc C IN 100nF Vcc Vcc APX803 Microprocessor RESET RESET INPUT GND GND APX803 1 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Ordering Information APX 8 03 - XX XX G - 7 Output type Voltage Package Green Packing 03 : Active-Low, 46 :4.63 SA : SOT23 G : Green 7 : Tape & Reel Open Drain 44 :4.38 SR : SOT23R 40 :4.00 31 :3.08 29 :2.93 26 : 2.63 23 : 2.25 Package Packaging 7” Tape and Reel Device Code (Note 2) Quantity Part Number Suffix APX803-XXSAG-7 SA SOT23 3000/Tape & Reel -7 APX803-XXSRG-7 SR SOT23R 3000/Tape & Reel -7 Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Pin Assignments (1) SOT23 (2) SOT23R ( Top View ) ( Top View ) GND 1 RESET 1 APX803 3 V APX803 3 V CC CC RESET 22 GND 22 Pin Descriptions Pin Name Description GND Ground Reset Output Pin RESET Active Low Open Drain V Operating Voltage Input CC APX803 Rev. 1 2 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Absolute Maximum Ratings Symbol Parameter Rating Unit ESD HBM Human Body Model ESD Protection 2 kV ESD MM Machine Model ESD Protection 200 V V Supply Voltage -0.3 to +6.0 V CC VRESET RESET (open drain) -0.3 to 6 V I Input Current, V 20 mA CC CC IO Output Current, RESET 20 mA Continuous Power Dissipation (T = +70°C), P A 400 mW D de-rate 4mW/°C above +70°C T Operating Junction Temperature Range -40 to +105 °C OP T Storage Temperature Range -65 to +150 °C ST Recommended Operating Conditions Symbol Parameter Min Max Unit V Supply Voltage 1.1 5.5 V CC V Input Voltage 0 (V +0.3) V IN CC VRESET RESEToutput voltage 0 5.5 V T Operating Ambient Temperature Range -40 85 °C A dV /dt V Rate of rise (V = 0~V ) 100 V/µs CC CC CC T APX803 Rev. 1 3 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Electrical Characteristics (T = 25ºC) A T = -40 to 85°C unless otherwise note. Typical values are at T =+25 °C. A A Symbol Parameter Test Conditions Min Typ. Max Unit I Supply Current V +0.2V 30 40 μA CC TH APX803-23 2.21 2.25 2.30 APX803-26 2.59 2.63 2.66 APX803-29 2.89 2.93 2.96 Reset APX803-31 T = 25oC 3.04 3.08 3.13 V V Threshold A TH APX803-40 3.94 4.00 4.06 APX803-44 4.31 4.38 4.45 APX803-46 4.56 4.63 4.70 Reset Threshold Tempco 30 ppm/ oC t Set-up Time V = V to (V – 100mV) 20 µs S CC TH TH t Reset Active Timeout Period T = 0oC to +85oC 140 200 280 ms DELAY A V = V -0.2, I = 1.2mA 0.3 CC TH SINK VOL RESETOutput Voltage Low VCC = VTH -0.2, ISINK = 3.5mA 0.4 V V > 1.0V, I = 50uA 0.3 CC SINK RESET Output High leakage I V > V +0.2 1 µA OH CC TH current Thermal Resistance θ SOT23/ SOT23R (Note 3) 201 °C/W JA Junction-to-Ambient Thermal Resistance θ SOT23/ SOT23R (Note 3) 56 °C/W JC Junction-to-Case Notes: 3. Test condition for SOT23 and SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. 4. Final datasheet limits to be determined by characterization and correlation. APX803 Rev. 1 4 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Functional Description Microprocessors (µPs) and microcontrollers (µC) have a reset drift to undetermined voltages. input to ensure that it starts up in a known state. The APX803 This presents no problem in most applications since most µP and drive the µP’s reset input to prevent code-execution errors during other circuitry is inoperative with V below 1V. CC power-up, power-down, or brownout conditions. They assert a reset signal whenever the V supply voltage declines below a Interfacing to µP with Bidirectional Reset Pins CC preset threshold, keeping it asserted for at least 140ms after V Since the RESET output on the APX803 is open drain, this CC has risen above the reset threshold. The APX803 has an device interfaces easily with μP/µC that have bidirectional reset open-drain output stage. pins, such as the Motorola 68HC11. Connecting the μP supervisor’s RESET output directly to the Ensuring a Valid Reset Output microcontroller’s (μC’s) RESET pin with a single pull-up resistor Down to V = 0 allows either device to assert reset. CC RESET is guaranteed to be a logic low for V > 1V. Once V CC CC Supervising and monitoring Multiple Supplies exceeds the reset threshold, an internal timer keeps RESET Generally, the pull-up resistor connected to the APX803 will connect to the supply voltage that is being monitored at the IC’s low for the reset timeout period; after this interval, RESET V pin. However, some systems may use the APX803 CC goes high. If a brownout condition occurs (VCC dips below the open-drain output to level-shift from the monitored supply to reset RESET reset threshold), RESET goes low. Any time the µP powered by a different supply voltage or monitor multiple V goes below the reset threshold, the internal timer resets to supplies that will be fed into 1 µC/µP reset input. CC zero, and RESET goes low. The internal timer starts after V returns above the reset threshold, and RESET remains CC low for the reset timeout period. When V falls below 1V, the APX803 RESET output no CC longer sinks current — it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESETcan Block Diagram RESET Driver / RESET Delay Circuit VREF APX803 Rev. 1 5 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Performance Characteristics RESET Threshold Voltage vs. Temperature RESET Timeout Period vs. Temperature 5.0 250 V) APX803-44 s) 240 ge( 4.5 d(m 230 a o olt 4.0 eri 220 V P 210 hold 3.5 eout 200 es m 190 T Thr 3.0 APX803-26 ET Ti 117800 E 2.5 S S E 160 E R R 2.0 150 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temperature (°C) Temperature (°C) Figure 1 Figure 2 Supply Current vs. Temperature Supply Current vs. Vcc 30 40 Vcc=3.3V 29 35 A) 28 u 30 pply Current( 22224567 y Current(uA) 122505 Su 23 ppl Vcc 22 Su 10 21 5 20 0 -50 -25 0 25 50 75 100 0 1 2 3 4 5 6 Temperature (°C) Vcc(V) Figure 3 Figure 4 APX803 Rev. 1 6 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Performance Characteristics (Continued) Nch Driver Sink Current vs. Vcc Nch Driver Sink Current vs. Vcc 60 60 APX803-26 VDS=0.5V APX803-44 VDS=0.5V -40ºC A) 50 A) 50 m m 25ºC k( 40 k( 40 n n si -40ºC si nt I 30 nt I 30 e 25ºC e Curr 20 Curr 20 85ºC nk 85ºC nk Si 10 Si 10 0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 1.0 2.0 3.0 4.0 5.0 Vcc(V) Vcc(V) Figure 5 Figure 6 Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 80 100 mA) 70 APX803-26 mA) 90 APX803-44 Vcc= 4.0V nt( 60 nt( 80 Curre 50 Curre 6700 Vcc= 3.5V put 40 put 50 Vcc= 3.0V ut Vcc= 2.5V ut er O 30 er O 3400 Vcc= 2.5V Driv 20 Vcc= 2.0V Driv 20 Vcc= 2.0V h 10 h Nc Vcc= 1.5V Nc 10 Vcc= 1.5V 0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 V (V) V (V) DS DS Figure 7 Figure 8 APX803 Rev. 1 7 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Timing Diagram Vth Vcc Vth TDelay TDelay /RESET Vth TDelay TDelay RESET Marking Information (1) SOT23 and SOT23R ( Top View ) 3 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; XX Y W X a~z : 27~52 week; z represents 52 and 53 week 1 2 X : A~Z : Green Device Package Identification Code APX803-46SA SOT23 V3 APX803-44SA SOT23 V4 APX803-40SA SOT23 V5 APX803-31SA SOT23 V6 APX803-29SA SOT23 V7 APX803-26SA SOT23 V8 APX803-23SA SOT23 V9 APX803-46SR SOT23R S3 APX803-44SR SOT23R S4 APX803-40SR SOT23R S5 APX803-31SR SOT23R S6 APX803-29SR SOT23R S7 APX803-26SR SOT23R S8 APX803-23SR SOT23R S9 APX803 Rev. 1 8 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Package Information (All Dimensions in mm) (1) Package Type: SOT23 and SOT23R Notes: 5. Package outline dimensions as shown on Diodes Inc. package outline dimensions document AP02002, which can be found on our website at http://www.diodes.com/datasheets/ap02002.pdf APX803 9 of 10 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

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