APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Description Pin Assignments The APX803/D is used for microprocessor (µP) supervisory ( Top View ) circuits to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost GND by eliminating external components and adjustments when 1 used with +5V, +3.3V, +3.0V powered circuits. APX803 These circuits perform a single function: they assert a reset RESET signal on power up and whenever the VCC supply voltage 3 VCC 3 VCC 2 declines below a preset threshold, keeping it asserted for a SOT23 fixed period of time after VCC has risen above the reset threshold. For the APX803D this period is a minimum of 1ms while for other APX803 variants it is at least 140ms. The reset comparator is designed to ignore fast transients on VCC, and ( Top View ) the outputs are guaranteed to be in the correct logic state for VCC down to 1V. RESET The APX803 is available with different reset thresholds 1 APX803 suitable for operation with a variety of supply voltages, however the APX803D is available with a 2.93V threshold GND voltage. The APX803/D have an open collector active low RESET output and compliment Diodes APX809/10 which have push- 2 SOT23R pull output stages.. Low supply current makes the APX803/D ideal for use in portable equipment. The APX803/D are available in two pin out variants of the 3-pin SOT23 package. Features Applications • • • • • • • • • • • • • • Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Open-drain RESET Active Low Power-On/power supply glitch Reset Pulse • APX803D 2ms (Typ) • APX803 200ms (Typ) 30µA Supply Current (Typ.) Guaranteed Reset Valid to VCC = +1V No External Components SOT23 and SOT23R: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Notes: Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery Powered Equipment 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. APX803 Document number: DS32132 Rev. 2 - 2 1 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Typical Application Circuit V CC CIN 100nF V CC V CC APX803 Microprocessor RESET INPUT RESET GND GND Pin Descriptions Pin Name GND Description Ground RESET Reset Output Pin Active Low Open Drain VCC Operating Voltage Input Functional Block Diagram VCC Oscillator Delay time RESET VREF APX803 Document number: DS32132 Rev. 2 - 2 APX803/D 2 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Absolute Maximum Ratings Symbol Parameter ESD HBM Human Body Model ESD Protection ESD MM Machine Model ESD Protection VCC VRESET Supply Voltage RESET (open drain) Rating Unit 2 kV 200 V -0.3 to +6.0 V -0.3 to 6 V ICC Input Current, VCC 20 mA IO Output Current, RESET Continuous Power Dissipation (TA = +70°C), derate 4mW/°C above +70°C 20 mA 400 mW PD TOP Operating Junction Temperature Range -40 to +105 °C TST Storage Temperature Range -65 to +150 °C Recommended Operating Conditions Symbol Parameter Min Max Unit 1.1 5.5 V VCC Supply Voltage VIN Input Voltage 0 (VCC+0.3) V RESET output voltage 0 5.5 V -40 85 °C 100 V/µs VRESET TA dVCC/dt Operating Ambient Temperature Range VCC Rate of rise (VCC = 0~VT) APX803 Document number: DS32132 Rev. 2 - 2 3 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Electrical Characteristics (TA = 25°C) TA= -40 to 85°C unless otherwise note. Typical values are at TA=+25 °C. Symbol ICC Parameter Supply Current Reset Threshold VTH Test Conditions Min VTH + 0.2V VOL IOH 30 40 μA 2.25 2.30 APX803-26 2.59 2.63 2.66 APX803-29 2.89 2.93 2.96 2.89 2.93 2.96 3.04 3.08 3.13 APX803-40 3.94 4.00 4.06 APX803-44 4.31 4.38 4.45 APX803-46 4.56 4.63 4.70 APX803D-29 APX803-31 VCC to RESET delay Reset Active Timeout Period Unit 2.21 o TA = 25 C VTH-H – VTH-L Reset Threshold Tempco tDELAY Max APX803-23 Reset Threshold hysteresis tS Typ. APX803-XX APX803D-29 RESET Output Voltage Low RESET Output High leakage current VCC = VTH to (VTH – 100mV) o o TA = 0 C to +85 C 140 V 40 mV 30 ppm/°C 20 µs 200 1 280 3.3 VCC = VTH -0.2, ISINK = 1.2mA 0.3 VCC = VTH -0.2, ISINK = 3.5mA 0.4 VCC > 1.0V, ISINK = 50uA 0.3 VCC > VTH +0.2 1 ms V µA θJA Thermal Resistance Junction-toAmbient SOT23/SOT23R (Note 2) 201 °C/W θJC Thermal Resistance Junction-to-Case SOT23/SOT23R (Note 2) 56 °C/W Notes: 2. Test condition for SOT23 and SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout. 3. Final datasheet limits to be determined by characterization and correlation. APX803 Document number: DS32132 Rev. 2 - 2 4 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Typical Performance Characteristics RESET Threshold Voltage vs. Temperature RESET Threshold Voltage vs. Temperature 5.0 RESET Threshold Voltage(V RESET Threshold Voltage(V 5.0 4.5 4.0 3.5 3.0 APX803-26 2.5 2.0 APX803-44 4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100 -50 100 RESET Timeout Period vs. Temperature RESET Timeout Period(ms) RESET Timeout Period(ms) 75 APX803 220 210 200 190 180 170 160 3.00 2.80 APX803D 2.60 2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00 -25 0 25 50 75 100 -50 -25 Temperature (°C) 0 25 50 75 100 5 6 Temperature (°C) Figure 3 Figure 4 Supply Current vs. Temperature Supply Current vs. Vcc 40 30 Vcc=3.3V 35 28 Supply Current(uA) Vcc Supply Current(uA) 50 Figure 2 230 29 25 Figure 1 RESET Timeout Period vs. Temperature 150 -50 0 Temperature (°C) 250 240 -25 Temperature (°C) 27 26 25 24 23 22 25 20 15 10 5 21 20 -50 30 0 -25 0 25 50 75 100 Temperature (°C) Document number: DS32132 Rev. 2 - 2 1 2 3 4 Vcc(V) Figure 5 APX803 0 Figure 6 5 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Typical Performance Characteristics (Continued) Nch Driver Sink Current vs. Vcc Nch Driver Sink Current vs. Vcc 60 60 Sink Current Isink(mA) Sink Current Isink(mA) 40 -40ºC 30 25ºC 20 85ºC 10 0 50 25ºC 40 30 85ºC 20 10 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 7 Figure 8 Nch Driver Output Current vs. VDS Nch Driver Output Current vs. VDS 100 Nch Driver Output Current(mA) 80 Nch Driver Output Current(mA) -40ºC APX803-44 VDS=0.5V APX803-26 VDS=0.5V 50 APX803-26 70 60 50 40 Vcc= 2.5V 30 20 Vcc= 2.0V 10 Vcc= 1.5V 0 APX803-44 90 Vcc= 4.0V 80 Vcc= 3.5V 70 60 Vcc= 3.0V 50 40 Vcc= 2.5V 30 20 Vcc= 2.0V 10 Vcc= 1.5V 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 Figure 9 APX803 Document number: DS32132 Rev. 2 - 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 VDS(V) V DS(V) Figure 10 6 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Timing Diagram Vth Vcc Vth TDelay TDelay TDelay TDelay /RESET Vth RESET Functional Description Microprocessors (µPs) and microcontrollers (µC) have a reset input to ensure that it starts up in a known state. The APX803/D drive the µP’s reset input to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold and keep it asserted for a fixed period of time after VCC has risen above the reset threshold. For the APX803D this period is a minimum of 1ms while for other APX803 variants it is at least 140ms. The APX803/D have an open-drain output stage. Since the RESET output on the APX803/D is open drain, this device interfaces easily with μP/µC that have Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin with a single pull- RESET is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC dips below the RESET reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. Document number: DS32132 Rev. 2 - 2 Interfacing to µP with Bidirectional Reset Pins bidirectional reset pins, such as the Motorola 68HC11. Ensuring a Valid Reset Output Down to VCC = 0 APX803 When VCC falls below 1V, the APX803/D RESET output no longer sinks current — it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most µP and other circuitry is inoperative with VCC below 1V. up resistor allows either device to assert reset. Supervising and monitoring Multiple Supplies Generally, the pull-up resistor connected to the APX803/D will connect to the supply voltage that is being monitored at the IC’s VCC pin. However, some systems may use the APX803/D open-drain output to level-shift from the monitored supply to reset the µP powered by a different supply voltage or monitor multiple supplies that will be fed into 1 µC/µP reset input. 7 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Ordering Information APX 8 03 - XX XX G - 7 Output type Voltage 46 44 40 31 29 26 23 03 : Active-Low, Open Drain : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25 Package Green Packing SA : SOT23 SR : SOT23R G : Green 7 : Tape & Reel APX 8 03 D - 29 XX G - 7 Device Output type Voltage Package Green Packing 03 : Active-Low, Open Drain 29 : 2.93 SA : SOT23 SR : SOT23R G : Green 7 : Tape & Reel Package Code APX803-XXSAG-7 APX803-XXSRG-7 APX803D-29SAG-7 APX803D-29SRG-7 Notes: SA SR SA SR Packaging (Note 4) SOT23 SOT23R SOT23 SOT23R 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7 3000/Tape & Reel -7 4. 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. APX803 Document number: DS32132 Rev. 2 - 2 8 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Marking Information (1) SOT23 and SOT23R ( Top View ) 3 XX Y W X 1 Device APX803-46SA APX803-44SA APX803-40SA APX803-31SA APX803-29SA APX803-26SA APX803-23SA APX803-46SR APX803-44SR APX803-40SR APX803-31SR APX803-29SR APX803-26SR APX803-23SR APX803D-29SA APX803D-29SR APX803 Document number: DS32132 Rev. 2 - 2 2 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Package SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23 SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23R SOT23 SOT23R 9 of 11 www.diodes.com Identification Code V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9 VN SN September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Package Outline Dimensions (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 Document number: DS32132 Rev. 2 - 2 10 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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