Diodes Incorporated

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Push-pull Active High Reset output and SOT23-3 supervisory IC

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Product Description

The PT7M78xx family microprocessor (µP) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in µP 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
  4. Manual reset.


  • Precision supply-voltage monitor
    • 4.63V (PT7M78xxL)
    • 4.38V (PT7M78xxM)
    • 3.08V (PT7M78xxT)
    • 2.93V (PT7M78xxS)
    • 2.63V (PT7M78xxR)
    • 2.32V (PT7M78xxZ)
    • 2.20V (PT7M78xxY)
    • 4.00V (PT7M78xxJ)
    • 2.25V (PT7M78xxK)
    • 2.80V (PT7M78xxG)
  • 200ms reset pulse width
  • Debounced CMOS-compatible manual-reset input (7811, 7812, 7823, 7825)
  • Reset Output Signal for Watchdog and Power
  • Abnormal, Manual Reset
  • Reset Push-Pull output (PT7M7809,7811,7823,7824,7825)
  • Reset Open-Drain output (PT7M7803)
  • Voltage monitor for power-fail or low battery warning
  • Guaranteed RESET/RESET valid at VCC=1.0V


  • Power-supply circuitry in µP systems
  • Networking
  • Security System
  • Server/Storage
  • Embedded System

Product Specifications

Product Parameters

Fixed Detect Voltages (V) 2.2, 2.25, 2.32, 2.63, 2.80, 2.93, 3.08, 4, 4.38, 4.63 V
Adjustable Detect Voltage Reference Voltage (V) N/A V
Number of Channels 1
Minimum Operating Voltage (V) 1 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 No
Watchdog No
Watchdog Time (s) None s
Power Fail Comparator Threshold (V) None V
Reset Output Topology Push-Pull
Ambient Temperature Range  (°C) -40 to 85 °C

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