TL7702-705-733B Datasheet, PDF (1/9 Pages) Texas Instruments – SUPPLY-VOLTAGE SUPERVISORS

TL7702B, TL7705B, TL7733B
SUPPLY-VOLTAGE SUPERVISORS
SLVS037L – SEPTEMBER 1989 – REVISED MAY 2002
D Power-On Reset Generator
D Automatic Reset Generation After
Voltage Drop
D RESET Output Defined From V_CC ≥ 1 V
D Precision Voltage Sensor
D Temperature-Compensated Voltage
Reference
D True and Complement Reset Outputs
D Externally Adjustable Pulse Duration
description
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 × 10⁴ × 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.
TL77xxBC . . . D OR P PACKAGE
TL7705BM . . . JG PACKAGE
TL7705BQ . . . D PACKAGE
(TOP VIEW)
REF 1
RESIN 2
CT 3
GND 4
8 V_CC
7 SENSE
6 RESET
5 RESET
TL7705BM . . . U PACKAGE
(TOP VIEW)
NC ¹
REF 2
RESIN 3
CT 4
GND 5
10 ^NC
9 ^VCC
8 ^SENSE
7 ^RESET
6 ^RESET
NC – No internal connection
TL7705BM . . . FK PACKAGE
(TOP VIEW)
NC
RESIN
NC
CT
NC
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC
SENSE
NC
RESET
NC
NC – No internal connection
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.
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
Copyright  2002, Texas Instruments Incorporated
1