Datasheet

TL7702B, TL7705B, TL7733B
SUPPLY-VOLTAGE SUPERVISORS
SLVS037M – SEPTEMBER 1989 – REVISED MAY 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Power-On Reset Generator
Automatic Reset Generation After
Voltage Drop
RESET Output Defined From V
CC
≥ 1 V
Precision Voltage Sensor
Temperature-Compensated Voltage
Reference
True and Complement Reset Outputs
Externally Adjustable Pulse Duration
3212019
910111213
4
5
6
7
8
18
17
16
15
14
NC
SENSE
NC
RESET
NC
NC
RESIN
NC
CT
NC
TL7705BM ...FK PACKAGE
(TOP VIEW)
NC REF NC
RESET
NC
V NC
NC
GND
NC
CC
1
2
3
4
8
7
6
5
REF
RESIN
CT
GND
V
CC
SENSE
RESET
RESET
TL77xxBC ...D OR P PACKAGE
TL7705BM . . . JG PACKAGE
TL7705BQ ...D PACKAGE
(TOP VIEW)
1
2
3
4
5
10
9
8
7
6
NC
REF
RESIN
CT
GND
NC
V
CC
SENSE
RESET
RESET
TL7705BM ...U PACKAGE
(TOP VIEW)
NC – No internal connection
NC – No internal connection
description/ordering information
The TL7702B, TL7705B, and TL7733B are integrated-circuit supply-voltage supervisors 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 V
CC
attains a value approaching 1 V. As V
CC
approaches 3 V (assuming that SENSE is above V
T+
),
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 C
T
: t
d
≈ 2.6 × 10
4
× C
T
, where C
T
is in farads (F) and t
d
is in seconds (s).
An external capacitor (typically 0.1 µF) must be connected to REF to reduce the influence of fast transients in
the supply voltage.
The TL7702BC, TL7705BC, and TL7733BC are characterized for operation from 0°C to 70°C. The TL7702BI,
TL7705BI, and TL7733BI are characterized for operation from –40°C to 85°C. The TL7705BQ is characterized
for operation from –40°C to 125°C. The TL7705BM is characterized for operation from –55°C to 125°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.
The TL7705BM is obsolete
and no longer is supplied.
Copyright  2003, 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.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.