APX803_D

APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Description The APX803/D is used for microprocessor (µP) supervisory circuits to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V powered circuits. These circuits perform a single function: they assert a reset signal on power up and whenever the VCC supply voltage declines below a preset threshold, keeping 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 reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. The APX803 is available with different reset thresholds suitable for operation with a variety of supply voltages, however the APX803D is available with a 2.93V threshold voltage. The APX803/D have an open collector active low RESET output and compliment Diodes APX809/10 which have pushpull 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. Pin Assignments ( Top View ) GND 1 APX803 RESET 2 3 VCC SOT23 ( Top View ) 1 APX803 GND 2 3 VCC RESET SOT23R Features • • • • 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) Applications • • • • • Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery Powered Equipment • • • • • 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. 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 100nF CIN V CC V CC APX803 RESET Microprocessor RESET INPUT GND GND Pin Descriptions Pin Name GND Ground Description RESET VCC Reset Output Pin Active Low Open Drain Operating Voltage Input Functional Block Diagram VCC Oscillator Delay time RESET VREF APX803/D APX803 Document number: DS32132 Rev. 2 - 2 2 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Absolute Maximum Ratings Symbol ESD HBM ESD MM VCC VRESET ICC IO PD TOP TST Parameter Human Body Model ESD Protection Machine Model ESD Protection Supply Voltage Rating 2 200 -0.3 to +6.0 -0.3 to 6 20 20 400 -40 to +105 -65 to +150 Unit kV V V V mA mA mW °C °C RESET (open drain) Input Current, VCC Output Current, RESET Continuous Power Dissipation (TA = +70°C), derate 4mW/°C above +70°C Operating Junction Temperature Range Storage Temperature Range Recommended Operating Conditions Symbol VCC VIN VRESET TA dVCC/dt Supply Voltage Input Voltage Parameter Min 1.1 0 0 -40 Max 5.5 (VCC+0.3) 5.5 85 100 Unit V V V °C V/µs RESET output voltage 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 APX803-23 APX803-26 APX803-29 Reset Threshold VTH APX803D-29 APX803-31 APX803-40 APX803-44 APX803-46 Reset Threshold hysteresis Reset Threshold Tempco tS tDELAY VCC to RESET delay Reset Active Timeout Period APX803-XX APX803D-29 VCC = VTH to (VTH – 100mV) o o TA = 0 C to +85 C o TA = 25 C Test Conditions VTH + 0.2V Min Typ. 30 Max 40 2.30 2.66 2.96 2.96 3.13 4.06 4.45 4.70 Unit μA 2.21 2.59 2.89 2.89 3.04 3.94 4.31 4.56 VTH-H – VTH-L 2.25 2.63 2.93 2.93 3.08 4.00 4.38 4.63 40 30 20 V mV ppm/°C µs 280 3.3 0.3 0.4 0.3 1 µA °C/W °C/W V ms 140 1 200 VCC = VTH -0.2, ISINK = 1.2mA VOL RESET Output Voltage Low RESET Output High leakage current Thermal Resistance Junction-toAmbient Thermal Resistance Junction-to-Case VCC = VTH -0.2, ISINK = 3.5mA VCC > 1.0V, ISINK = 50uA IOH θJA θJC Notes: VCC > VTH +0.2 SOT23/SOT23R (Note 2) SOT23/SOT23R (Note 2) 201 56 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 5.0 5.0 RESET Threshold Voltage vs. Temperature RESET Threshold Voltage(V RESET Threshold Voltage(V 4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100 APX803-44 4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100 APX803-26 Temperature (°C) Temperature (°C) Figure 1 RESET Timeout Period vs. Temperature 250 240 230 220 210 200 190 180 170 160 150 -50 -25 0 25 50 75 100 Figure 2 RESET Timeout Period vs. Temperature RESET Timeout Period(ms) APX803 RESET Timeout Period(ms) 3.00 2.80 2.60 2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00 -50 -25 0 25 50 75 100 APX803D Temperature (°C) Temperature (°C) Figure 3 Supply Current vs. Temperature 30 29 Figure 4 Supply Current vs. Vcc 40 Vcc=3.3V 35 30 25 20 15 10 5 0 -25 0 25 50 75 100 Vcc Supply Current(uA) 28 27 26 25 24 23 22 21 20 -50 Supply Current(uA) Temperature (°C) 0 1 2 3 4 5 6 Vcc(V) Figure 5 APX803 Document number: DS32132 Rev. 2 - 2 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 60 APX803-26 VDS=0.5V Nch Driver Sink Current vs. Vcc 60 APX803-44 VDS=0.5V -40ºC 25ºC Sink Current Isink(mA) 40 -40ºC Sink Current Isink(mA) 50 50 40 30 20 10 0 85ºC 30 25ºC 20 85ºC 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 Nch Driver Output Current vs. VDS 80 100 Figure 8 Nch Driver Output Current vs. VDS Nch Driver Output Current(mA) 90 80 70 60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 Vcc= 2.0V Vcc= 1.5V 2.0 2.5 3.0 3.5 4.0 Vcc= 3.5V Vcc= 3.0V Vcc= 2.5V Nch Driver Output Current(mA) 70 60 50 40 APX803-26 APX803-44 Vcc= 4.0V Vcc= 2.5V 30 20 10 0 0.0 0.5 1.0 Vcc= 1.5V 1.5 2.0 2.5 3.0 Vcc= 2.0V V DS(V) VDS(V) Figure 9 Figure 10 APX803 Document number: DS32132 Rev. 2 - 2 6 of 11 www.diodes.com September 2010 © Diodes Incorporated APX803/D 3-PIN MICROPROCESSOR RESET CIRCUIT Timing Diagram Vth Vcc Vth TDelay /RESET Vth TDelay TDelay RESET TDelay 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. 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. Interfacing to µP with Bidirectional Reset Pins Since the RESET output on the APX803/D is open drain, this device interfaces easily with μP/µC that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin with a single pullup resistor allows either device to assert reset. Ensuring a Valid Reset Output Down to VCC = 0 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), 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. 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. APX803 Document number: DS32132 Rev. 2 - 2 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 03 : Active-Low, Open Drain Voltage 46 44 40 31 29 26 23 : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25 Package SA : SOT23 SR : SOT23R Green G : Green Packing 7 : Tape & Reel APX 8 03 D - 29 XX G - 7 Output type 03 : Active-Low, Open Drain Voltage 29 : 2.93 Package SA : SOT23 SR : SOT23R Green G : Green Packing 7 : Tape & Reel Device APX803-XXSAG-7 APX803-XXSRG-7 APX803D-29SAG-7 APX803D-29SRG-7 Notes: Package Code 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 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 Identification Code V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9 VN SN APX803 Document number: DS32132 Rev. 2 - 2 9 of 11 www.diodes.com 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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