TL7700A Series

July 2000

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

N

Minidip

DESCRIPTION

The TL7700A series are monolithic supply voltage

supervisor IC’s specifically designed for use as reset

controllers in microcomputer and microprocessor

systems. During power-up the device tests the sup-

ply voltage and keeps the RESET and RESET out-

puts active (high and low, respectively) as long as

the supply voltage has not reached its nominal volt-

age value. Taking RESIN low has the same effect.

To ensure that the microcomputer system has reset,

the TL7700A then initiates an internal time count

that delays the return of the reset outputs to their in-

active states. Since the time delay for most micro-

computers and microprocessors is in the order of

several machine cycles, the device internal time de-

lay is determined by an external capacitor con-

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-

ternal capacitor (typically 0.1

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

acterized from 0

D

SO8

ORDERING NUMBERS

Temperature Range

Minidip

S08

0 to 70

TL77XXACP

TL77XXACD

-25 to 85

TL77XXAIP

TL77XXAID

PIN CONNECTION (top view)

1/7