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LTC1232

sn1232 1232fas

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4.62V/4.37V Precision Voltage Monitor

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Superior Upgrade for DS1232

Microprocessor

Supervisory Circuits

RST Output Voltage vs

Supply Voltage

FEATURES

APPLICATIO S

DESCRIPTIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

LTC1232 • TA02

SUPPLY VOLTAGE (V)

0

3

4

5

4

2

1

0

1

2

3

5

The LTC

watchdog timing and external reset for microprocessor

systems. A precise internal voltage reference and

comparator circuit monitor the power supply line. When

an out-of-tolerance condition occurs, the reset outputs

are forced to active states. The RST output is guaranteed

The LTC1232 has an internal watchdog timer which forces

the reset outputs to active states when the Strobe input is

not forced low prior to a preset time-out period. The

watchdog timing can be set to operate on time-out periods

of typically 150ms, 600ms or 1.2 seconds.

The LTC1232 performs push-button reset control.

The LTC1232 debounces the push-button input

and guarantees an active reset pulse width of 250ms

minimum.

TYPICAL APPLICATIO

100k

5V DC

5V DC

I/O LINE

MPU

(e.g. 6805)

RESET

LTC1232 • TA01

LTC1232

PB RST

TD

TOL

GND

ST

RST

RST