TL77XXAC STMicroelectronics, TL77XXAC Datasheet

TL77XXAC

Manufacturer Part Number

TL77XXAC

Description

SUPPLY VOLTAGE SUPERVISORS

Manufacturer

STMicroelectronics

Datasheet

1.TL77XXAC.pdf (7 pages)

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DESCRIPTION

The TL7700Aseriesaremonolithicintegratedcircuit

supplyvoltagesupervisorsspecifically desi-gnedfor

use as reset controllers in microcomputer and mi-

croprocessor systems. During power-up the device

tests the supply voltage and keeps the RESET and

RESET outputs active (high and low, respectively)

as long as the supply voltage has not reached its

nominal voltage value. Taking RESIN low has the

same effect. To ensure that the microcomputer sys-

tem hasreset, the TL7700Athen initiates aninternal

time delay that delays the return of the reset outputs

to theirinactivestates. Since the timedelay for most

microcomputersand microprocessors is in the order

of several machine cycles, the device internal time

delay is determined by an external time delay is de-

termined by an external capacitor connected to the

Where : C

addition, when the supply voltage drops below the

nominal value, the outputs will be active until the

supply voltage returns to the nominal value. An ex-

ternalcapacitor(typically0.1 F) must be connected

to the REF output (pin 1) to reduce the influence of

fast transients in the supply voltage.

The TL7700AI series is characterized for operation

from – 25

acterized from 0

April 2000

= 1.3 x 10

POWER-ON RESET GENERATOR

AUTOMATIC RESET GENERATION AFTER

VOLTAGE DROP

WIDE SUPPLY VOLTAGE RANGE ... 3V TO

18V

PRECISION VOLTAGE SENSOR

TEMPERATURE-COMPENSATED VOLTAGE

REFERENCE

TRUE AND COMPLEMENT RESET OUTPUTS

EXTERNALLY ADJUSTABLE PULSE WIDTH

input (pin 3).

C to 85

is in farads (F) and t

x C

C to 70

C ; the TL7700AC series is char-

in seconds (s). In

SUPPLY VOLTAGE SUPERVISORS

ORDERING NUMBERS

PIN CONNECTION (top view)

Temperature Range

-25 to 85

0 to 70

TL7700A Series

Min idip

TL77XXACP

TL77XXAIP

SO 8

Minidip

TL77XXACD

TL77XXAID

S08

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