APX803 3-PIN MICROPROCESSOR RESET CIRCUIT General Description Features • • • • • • • • • • Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in three Output Configurations Open-drain RESET Active Low 200ms Typ Power-On Reset Pulse Width 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) The APX803 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 at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The APX803 have an open collector active low RESET output. 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. 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 CIN 100nF Vcc Vcc APX803 Microprocessor RESET GND APX803 Document number: DS32132 Rev. 1 – 2 RESET INPUT GND 1 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Ordering Information APX 8 03 - XX XX G - 7 Output type Voltage 03 : Active-Low, Open Drain Package Code SA SR Device APX803-XXSAG-7 APX803-XXSRG-7 Notes: 46 44 40 31 29 26 23 : 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 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 Packaging (Note 2) SOT23 SOT23R 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 ) GND 1 RESET APX803 RESET ( Top View ) 3 1 APX803 VCC 2 GND 3 VCC 2 Pin Descriptions Pin Name GND Description Ground RESET Reset Output Pin Active Low Open Drain VCC Operating Voltage Input APX803 Rev. 1 Document number: DS32132 Rev. 1 – 2 2 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 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 ICC IO Supply Voltage RESET (open drain) Input Current, VCC Rating Unit 2 kV 200 V -0.3 to +6.0 V -0.3 to 6 V 20 mA 20 mA 400 mW TOP Output Current, RESET Continuous Power Dissipation (TA = +70°C), de-rate 4mW/°C above +70°C Operating Junction Temperature Range -40 to +105 °C TST Storage Temperature Range -65 to +150 °C PD Recommended Operating Conditions Symbol Parameter Min Max Unit 1.1 5.5 V Input Voltage 0 (VCC+0.3) V RESET output voltage Operating Ambient Temperature Range 0 5.5 V -40 85 °C 100 V/µs VCC Supply Voltage VIN VRESET TA dVCC/dt VCC Rate of rise (VCC = 0~VT) APX803 Rev. 1 Document number: DS32132 Rev. 1 – 2 3 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Electrical Characteristics (TA = 25ºC) TA= -40 to 85°C unless otherwise note. Typical values are at TA=+25 °C. Symbol Parameter Test Conditions ICC Supply Current VTH + 0.2V APX803-23 APX803-26 APX803-29 Reset APX803-31 TA = 25oC VTH Threshold APX803-40 APX803-44 APX803-46 Reset Threshold Tempco tS Set-up Time VCC = VTH to (VTH – 100mV) tDELAY Reset Active Timeout Period TA = 0oC to +85oC VCC = VTH -0.2, ISINK = 1.2mA VOL VCC = VTH -0.2, ISINK = 3.5mA RESET Output Voltage Low VCC > 1.0V, ISINK = 50uA IOH θJA θJC Notes: RESET Output High leakage V > V +0.2 CC TH current Thermal Resistance SOT23/ SOT23R (Note 3) Junction-to-Ambient Thermal Resistance SOT23/ SOT23R (Note 3) Junction-to-Case Min 2.21 2.59 2.89 3.04 3.94 4.31 4.56 140 Typ. 30 2.25 2.63 2.93 3.08 4.00 4.38 4.63 30 20 200 Max 40 2.30 2.66 2.96 3.13 4.06 4.45 4.70 280 0.3 0.4 0.3 1 Unit μA V ppm/ oC µs ms V µA 201 °C/W 56 °C/W 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 Document number: DS32132 Rev. 1 – 2 4 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Functional Description Microprocessors (µPs) and microcontrollers (µC) have a reset input to ensure that it starts up in a known state. The APX803 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, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The APX803 has an open-drain output stage. 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), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and 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 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 pull-up resistor allows either device to assert reset. Supervising and monitoring Multiple Supplies Generally, the pull-up resistor connected to the APX803 will connect to the supply voltage that is being monitored at the IC’s VCC pin. However, some systems may use the APX803 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. The internal timer starts after VCC returns above the reset threshold, and low for the reset timeout period. RESET remains When VCC falls below 1V, the APX803 RESET output no longer sinks current — it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can Block Diagram Driver RESET / RESET Delay Circuit VREF APX803 Rev. 1 Document number: DS32132 Rev. 1 – 2 5 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Performance Characteristics RESET Timeout Period vs. Temperature RESET Threshold Voltage vs. Temperature 250 RESET Timeout Period(ms) RESET Threshold Voltage(V) 5.0 APX803-44 4.5 4.0 3.5 3.0 APX803-26 2.5 -25 0 25 50 75 230 220 210 200 190 180 170 160 150 -50 2.0 -50 240 100 -25 Figure 1 50 75 100 5 6 Supply Current vs. Vcc Supply Current vs. Temperature 40 Vcc=3.3V 35 28 Supply Current(uA) Vcc Supply Current(uA) 25 Figure 2 30 29 0 Temperature (°C) Temperature (°C) 27 26 25 24 23 22 25 20 15 10 5 21 20 -50 30 0 -25 0 25 50 75 100 Figure 3 APX803 Rev. 1 Document number: DS32132 Rev. 1 – 2 0 1 2 3 4 Vcc(V) Temperature (°C) Figure 4 6 of 10 www.diodes.com MARCH 2010 © 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 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 5 Figure 6 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 VDS(V) Document number: DS32132 Rev. 1 – 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 VDS(V) Figure 7 APX803 Rev. 1 0.0 Figure 8 7 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 3-PIN MICROPROCESSOR RESET CIRCUIT Timing Diagram Vth Vcc Vth TDelay TDelay TDelay TDelay /RESET Vth RESET 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 APX803 Rev. 1 Document number: DS32132 Rev. 1 – 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 8 of 10 www.diodes.com Identification Code V3 V4 V5 V6 V7 V8 V9 S3 S4 S5 S6 S7 S8 S9 MARCH 2010 © 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 Document number: DS32132 Rev. 1 – 2 9 of 10 www.diodes.com MARCH 2010 © Diodes Incorporated APX803 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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