Diodes Incorporated

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SO 8

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Back to MicroProcessor Supervisory IC / Reset IC / Voltage Detector

PT7A7623 (Obsolete)

Micro-processor (?P) Supervisory Circuits

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The PT7A7611-7615/7621-7625/7631-7635 family micro-processor (μP) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in μP’s systems. These devices reduce the complexity and number of components required to monitor power-supply and battery functions.

The main functions are:
1. Asserting reset output during power-up, power-down and brownout conditions for μP system.
2. Detecting power failure or low-battery conditions with a 1.25V threshold detector.
3. Watchdog functions (not for PT7A7631-7635).


  • Precision Supply-voltage Monitor
    • 4.63V (PT7A7611/7621/7631)
    • 4.38V (PT7A7612/7622/7632)
    • 3.08V (PT7A7613/7623/7633)
    • 2.93V (PT7A7614/7624/7634)
    • 2.63V (PT7A7615/7625/7635)
  • 200ms Reset Pulse Width
  • Debounced TTL/CMOS-compatible Manual-reset Input
  • Independent Watchdog Timer 1.6sec Time-out (Not Available for PT7A7631-7635)
  • Voltage Monitor for Power-fail or Low Battery Warning
  • Reset Output Signal:
    • Active-low Only (PT7A7611-7615)
    • Active-high Only (PT7A7621-7625)
    • Active-high and Active-low (PT7A7631-7635)
  • Guaranteed RESET/RESET Valid at VCC = 1V


  • Computers
  • Controllers
  • Intelligent Instruments
  • Critical μP and μC Power Monitoring
  • Portable/Battery Powered Equipment

Product Specifications

Product Parameters

Fixed Detect Voltages (V) 2.63, 2.93, 3.08, 4.38, 4.63 V
Adjustable Detect Voltage Reference Voltage (V) N/A V
Number of Channels 1
Minimum Operating Voltage (V) 2.7 V
Maximum Input Voltage (V) 5.5 V
Quiescent Current (µA) 10 µA
Typical Time Delay (µs) N/A µs
Reset Period (ms) 200 ms
RESET Output (Active High) Yes (Active High)
RESET Output (Active Low) No (Active Low)
Manual RESET Yes
Watchdog Yes
Watchdog Time (s) 1.6 s
Power Fail Comparator Threshold (V) 1.25 V
Reset Output Topology Push-Pull
Ambient Temperature Range  (°C) -40 to 85 °C

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Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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