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TL7705ACDG4 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
电源监控芯片
封装:
SOIC-8
描述:
TEXAS INSTRUMENTS TL7705ACDG4 电压监控器, 高电平有效, 低电平有效复位, 3.5V-18V输入, SOIC-8
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引脚图在P3Hot
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原理图在P8P10P12P13
封装尺寸在P17P18P19P20P22P23
标记信息在P17P18P19P20
封装信息在P16P17P18P19P20P21P22P23
技术参数、封装参数在P4
应用领域在P1P31
电气规格在P5
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TL7705ACDG4数据手册
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~100 µA
TL7702A
,
TL7705A
,
TL7709A
,
TL7712A
,
TL7715A
SLVS028J –APRIL 1983–REVISED JANUARY 2015
www.ti.com
9 Detailed Description
9.1 Overview
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.
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 μF) must be connected to REF to reduce the
influence of fast transients in the supply voltage.
Five versions of this circuit are available:
• TL7705A (Vt = 4.55 V): Application in TTL-systems and microcomputer systems which require a 5 volt supply
(e.g. TMS7000)
• TL7709A (Vt = 7.6 V): Application in microcomputer systems using the TMS1XXXNLL
• TL7712A (Vt = 10.8 V): Application in CMOS, microprocessor, and memory circuits with a 12 volt supply.
• TL7715A (Vt = 13.5 V): Application in circuits which operate with a supply voltage of 15 V, as is found often in
analog circuits.
• TL7702A (Vt = 2.5 V): Application in systems where other supply voltages are used. The required trigger level
my be adjusted with an external resistor divider at the SENSE input.
9.2 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.
A. TL7702A: R1 = 0 Ω, R2 = open
TL7705A: R1 = 7.8 kΩ, R2 = 10 kΩ
TL7709A: R1 = 19.7 kΩ, R2 = 10 kΩ
TL7712A: R1 = 32.7 kΩ, R2 = 10 kΩ
TL7715A: R1 = 43.4 kΩ, R2 = 10 kΩ
B. Resistor values shown are nominal.
8 Submit Documentation Feedback Copyright © 1983–2015, Texas Instruments Incorporated
Product Folder Links: TL7702A TL7705A TL7709A TL7712A TL7715A
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