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PT0082(10/10) Ver: 7
1
Data Sheet
PT7A7511-15/7521-25/7531-35
µP Supervisor Circuits
Features
z 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)
z 200ms reset pulse width
z Debounced TTL/CMOS-compatible manual-
reset input
z Independent watchdog timer 1.6sec time-out (not
available for PT7A7531 - 7535)
z Reset output signal:
- Active-low only (PT7A7511 - 7515)
- Active-high only (PT7A7521 - 7525)
- Active-high and active-low (PT7A7531 - 7535)
z Voltage monitor for power-fail or low battery
warning
z Guaranteed RESET/RESET valid at VCC=1.2V
Description
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)
Applications
z Power-supply circuitry in µP systems
Ordering Information
Part Number Package Part Number Package
PT7A751xPE Lead free DIP-8 PT7A751xWE Lead free and Green SOIC-8
PT7A752xPE Lead free DIP-8 PT7A752xWE Lead free and Green SOIC-8
PT7A753xPE Lead free DIP-8 PT7A753xWE Lead free and Green SOIC-8
Note: “X” refers to voltage range, see below table.
Suffix: X—Monitored Voltage and Function Comparison
Part No. Reset
Threshold Reset Active
Low or High Nom. Reset
Time (ms), tRS Nom. Watch dog
Time (sec), tWD Power Fail
Comp. Manual
Reset Input
PT7A7511 4.63V LOW 200 1.6 1.25V detector Yes
PT7A7521 4.63V HIGH 200 1.6 1.25V detector Yes
PT7A7531 4.63V LOW, HIGH 200 unavailable 1.25V detector Yes
PT7A7512 4.38V LOW 200 1.6 1.25V detector Yes
PT7A7522 4.38V HIGH 200 1.6 1.25V detector Yes
PT7A7532 4.38V LOW, HIGH 200 unavailable 1.25V detector Yes
PT7A7513 3.08V LOW 200 1.6 1.25V detector Yes
PT7A7523 3.08V HIGH 200 1.6 1.25V detector Yes
PT7A7533 3.08V LOW, HIGH 200 unavailable 1.25V detector Yes
PT7A7514 2.93V LOW 200 1.6 1.25V detector Yes
PT7A7524 2.93V HIGH 200 1.6 1.25V detector Yes
PT7A7534 2.93V LOW, HIGH 200 unavailable 1.25V detector Yes
PT7A7515 2.63V LOW 200 1.6 1.25V detector Yes
PT7A7525 2.63V HIGH 200 1.6 1.25V detector Yes
PT7A7535 2.63V LOW, HIGH 200 unavailable 1.25V detector Yes