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μP Supervisor Circuits

2014-03-0004

PT0082-9

03/26/14

1

PT7A7511-15/7521-25/7531-35

Features



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



Description

The

PT7A751X/752X/753X

family

micro-

processor (P) supervisory circuits are targeted to

improve reliability and accuracy of power-supply

circuitry in P’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 P system.

2. Detecting

power

failure

or

low-battery

conditions with a 1.25V threshold detector.

3. Watchdog functions (not for PT7A753x)

Applications

Pin Configuration

Top View

1

2

3

4

8

7

6

5

MR

GND

PFI

WDO

RESET

WDI

PFO

PT7A7511P-7515P

PT7A7511W-7515W

8-Pin PDIP/8-Pin SOIC

1

2

3

4

8

7

6

5

MR

GND

PFI

WDO

RESET

WDI

PFO

PT7A7521P-7525P

PT7A7521W-7525W

8-Pin PDIP/8-Pin SOIC

1

2

3

4

8

7

6

5

MR

GND

PFI

RESET

RESET

NC

PFO

PT7A7531P-7535P

PT7A7531W-7535W

8-Pin PDIP/8-Pin SOIC

PT7A7511W-7515W

PT7A7521W-7525W

PT7A7531W-7535W