TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028E – APRIL 1983 – REVISED JULY 1999
D
D
D
D
D
D
D
D OR P PACKAGE
(TOP VIEW)
Power-On Reset Generator
Automatic Reset Generation After Voltage
Drop
Wide Supply-Voltage Range
Precision Voltage Sensor
Temperature-Compensated Voltage
Reference
True and Complement Reset Outputs
Externally Adjustable Pulse Duration
REF
RESIN
CT
GND
1
8
2
7
3
6
4
5
VCC
SENSE
RESET
RESET
description
The TL77xxA family of integrated-circuit supply-voltage supervisors is specifically designed for use as reset
controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply
for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low)
when VCC attains a value approaching 3.6 V. At this point (assuming that SENSE is above VIT+), the delay timer
function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively).
When an undervoltage condition occurs during normal operation, outputs RESET and RESET go active. To
ensure that a complete reset occurs, the reset outputs remain active for a time delay after the voltage at the
SENSE input exceeds the positive-going threshold value. The time delay is determined by the value of the
external capacitor CT: td = 1.3 × 104 × CT, where CT is in farads (F) and td is in seconds (s).
During power down (assuming that SENSE is below VIT–), the outputs remain active until the VCC falls below
a maximum of 2 V. After this, the outputs are undefined.
An external capacitor (typically 0.1 µF for the TL77xxAC and TL77xxAI) must be connected to REF to reduce
the influence of fast transients in the supply voltage.
The TL77xxAC series is characterized for operation from 0°C to 70°C. The TL77xxAI series is characterized
for operation from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
FORM
(Y)
SMALL
OUTLINE
(D)
PLASTIC
DIP
(P)
0°C to 70°C
TL7702ACD
TL7705ACD
TL7709ACD
TL7712ACD
TL7715ACD
TL7702ACP
TL7705ACP
TL7709ACP
TL7712ACP
TL7715ACP
TL7702ACY
TL7705ACY
TL7709ACY
TL7712ACY
TL7715ACY
–40°C to 85°C
TL7702AID
TL7705AID
TL7709AID
TL7712AID
TL7715AID
TL7702AIP
TL7705AIP
TL7709AIP
TL7712AIP
TL7715AIP
—
—
—
—
—
TA
The D package is available taped and reeled. Add the suffix R to the
device type (e.g., TL7702ACDR). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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