APX803-29SAG-7 DIODES | Alldatasheet

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Technical content

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 1 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated

  • 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 V CC = +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 V CC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after V CC 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 V CC, and the outputs are guaranteed to be in the correct logic state for V CC 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.
  • Computers
  • Controllers
  • Intelligent Instruments
  • Critical µP and µC Power Monitoring
  • Portable/Battery Powered Equipment APX803 GND RESET Vcc Microprocessor Vcc GND RESET INPUT Vcc CIN 100nF Features General Description

Applications

Typical Application Circuit

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 Rev. 1 2 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated APX 8 03 - XX XX G - 7 Voltage Package Packing 7 : Tape & Reel Output type Green G : GreenSA : SOT2346 : 4.63 44 : 4.38 40 : 4.00 31 : 3.08 29 : 2.93 26 : 2.63 23 : 2.25 03 : Active-Low, Open Drain SR : SOT23R Device Package Code Packaging (Note 2) 7” Tape and Reel 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. (1) SOT23 (2) SOT23R ( Top View ) GND VCCAPX803 RESET ( Top View ) 2GND VCCAPX803 RESET

Ordering Information

VCC Operating Voltage Input

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 Rev. 1 3 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated Absolute Maximum Ratings Symbol Parameter Rating Unit ESD HBM Human Body Model ESD Protection 2 kV ESD MM Machine Model ESD Protection 200 V VCC Supply Voltage -0.3 to +6.0 V VRESET RESET (open drain) -0.3 to 6 V ICC Input Current, V CC 20 mA IO Output Current, RESET 20 mA PD Continuous Power Dissipation (TA = +70°C), de-rate 4mW/°C above +70°C 400 mW 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 VCC Supply Voltage 1.1 5.5 V VIN Input Voltage 0 (VCC+0.3) V VRESET RESET output voltage 0 5.5 V TA Operating Ambient Temperature Range -40 85 °C dVCC/dt VCC Rate of rise (VCC = 0~VT) 100 V/µs

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 Rev. 1 4 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated Electrical Characteristics (TA = 25ºC) TA= -40 to 85°C unless otherwise note. Typical values are at TA=+25 °C. Symbol Parameter Test Conditions Min Typ. Max Unit ICC Suppl y Current VTH + 0.2V 30 40 μA VTH Reset Threshold APX803-23 T A = 25oC 2.21 2.25 2.30 V APX803-26 2.59 2.63 2.66 APX803-29 2.89 2.93 2.96 APX803-31 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 Reset Threshold Tempco 30 ppm/ oC tS Set-up Time VCC = VTH to (VTH – 100mV) 20 µs tDELAY Reset Active Timeout Period T A = 0oC to +85oC 140 200 280 ms VOL T RESEOutput Voltage Low VCC = VTH -0.2, ISINK = 1.2mA 0.3 V VCC = VTH -0.2, ISINK = 3.5mA 0.4 VCC > 1.0V, ISINK = 50uA 0.3 IOH T RESE Output High leakage current VCC > VTH +0.2 1 µA θJA Thermal Resistance Junction-to-Ambient SOT23/ SOT23R (Note 3) 201 °C/W θJC Thermal Resistance Junction-to-Case SOT23/ SOT23R (Note 3) 56 °C/W Notes: 3. Test condition for SOT23 and SOT23R: Devices mounted on FR-4 substrate PC board, 2oz copper, with minimum recommen ded pad layout. 4. Final datasheet limits to be determined by characterization and correlation.

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 Rev. 1 5 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated 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 V CC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after V CC has risen above the reset threshold. The APX803 has an open-drain output stage. Ensuring a Valid Reset Output Down to V CC = 0 RESET is guaranteed to be a logic low for V CC > 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 (V CC 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. When V CC 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 drift to undetermined voltages. This presents no problem in most applications since most µP and other circuitry is inoperative with V CC below 1V. Interfacing to µP with Bidirectional Reset Pins Since the RESET output on the APX803 is open drain, this device interfaces easily with μ P/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 V CC 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. Block Diagram VREF Delay Circuit Driver RESET / RESET

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 Rev. 1 8 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated Timing Diagram Vth Vth /RESET RESET TDelay TDelay TDelay TDelay Vcc Vth Marking Information (1) SOT23 and SOT23R 1 2 XX Y W X ( Top View ) XX : Identification code W : Week : A~Z : 1~26 week; X : A~Z : Green Y : Year 0~9 a~z : 27~52 week; z represents 52 and 53 week 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

3-PIN MICROPROCESSOR RESET CIRCUIT APX803 9 o f 1 0 MARCH 2010 Document number: DS32132 Rev. 1 – 2 www.diodes.com © Diodes Incorporated 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 o n o u r w e b s i t e a t http://www.diodes.com/datasheets/ap02002.pdf

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