Diodes Incorporated
SO 8

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Active Low Reset output in

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The PT7A751X/752X/753X family microprocessor
(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 PT7A753x)


  • Power-supply circuitry in µP systems


  • Precision supply-voltage monitor
    - 4.63V (PT7A7511, 7521, 7531)
    - 4.38V (PT7A7512, 7522, 7532)
    - 3.08V (PT7A7513, 7523, 7533)
    - 2.93V (PT7A7514, 7524, 7534)
    - 2.63V (PT7A7515, 7525, 7535)
  • 200ms reset pulse width
  • Debounced TTL/CMOS-compatible manual reset input
  • Independent watchdog timer 1.6sec time-out (not available for PT7A7531 - 7535)
  • Reset output signal:
    - Active-low only (PT7A7511 - 7515)
    - Active-high only (PT7A7521 - 7525)
    - Active-high and active-low (PT7A7531 - 7535)
  • Voltage monitor for power-fail or low battery warning
  • Guaranteed RESET/RESET valid at VCC=1.2V

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) Vd+10% V
Maximum Input Voltage (V) 5.5 V
Quiescent Current (µA) 30 µA
Typical Time Delay (µs) N/A µs
Reset Period (ms) 200 ms
RESET Output (Active High) No (Active High)
RESET Output (Active Low) Yes (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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