TL7702A datasheet, PDF - EEWORLD Datasheet

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TL7702A: DescriptionSUPPLY VOLTAGE SUPERVISORS; File Size56KB，7 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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TL7702A Overview

SUPPLY VOLTAGE SUPERVISORS

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TL7700 A Series

SUPPLY VOLTAGE SUPERVISORS

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

Min idip

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 an internal

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

input (pin 3).

= 1.3 x 10

x C

Where : C

is in farads (F) and t

in seconds (s). In

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

µF)

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

C to 85

C ; the TL7700AC series is char-

acterized from 0

C to 70

August 1996

SO 8

ORDERING NUMBERS

Temperature Range

0 to 70 C

-25 to 85 C

Minidip

TL77XXACP

TL77XXAIP

S08

TL77XXACD

TL77XXAID

PIN CONNECTION

(top view)

1/7

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