參數(shù)資料
型號(hào)： T7705A
廠商： Texas Instruments, Inc.
英文描述： SUPPLY-VOLTAGE SUPERVISORS
中文描述： 電源電壓監(jiān)事
文件頁(yè)數(shù)： 2/17頁(yè)
文件大?。?/td> 331K
代理商： T7705A
TL7702A, TL7705A, TL7709A, TL7712A, TL7715A
SUPPLY-VOLTAGE SUPERVISORS
SLVS028H
–
APRIL 1983
–
REVISED MAY 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically 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 3.6 V. At this point (assuming that SENSE is above V
IT+
), 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, 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
= 1.3
×
10
4
×
C
T
, where C
T
is in farads (F) and t
d
is in seconds (s).
During power down and when SENSE is below V
IT
–
, the outputs remain active until V
CC
falls below 2 V. After
this, the outputs are undefined.
An external capacitor (typically 0.1
μ
F) must be connected to REF to reduce the influence of fast transients in
the supply voltage.
functional block diagram
The functional block diagram is shown for illustrative purposes only; the actual circuit includes a trimming
network to adjust the reference voltage and sense-comparator trip point.
RESIN
≈
100
μ
A
R1
(see Note A)
6
5
1
Reference
Voltage
SENSE
GND
8
3
7
2
4
VCC
CT
REF
NOTES: A. TL7702A: R1 = 0
, R2 = open
TL7705A: R1 = 7.8 k
, R2 = 10 k
TL7709A: R1 = 19.7 k
, R2 = 10 k
TL7712A: R1 = 32.7 k
, R2 = 10 k
TL7715A: R1 = 43.4 k
, R2 = 10 k
B. Resistor values shown are nominal.
RESET
RESET
R2
(see Note A)
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