Datasheet 搜索 > NXP（恩智浦） > 74HC123 数据手册 > 74HC123 数据手册 1/24 页
器件3D模型￥ 0.533
74HC123 数据手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
封装:
SO-16
描述:
双可再触发单稳多谐振荡器与重置 Dual retriggerable monostable multivibrator with reset
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
导航目录
74HC123数据手册
Page:
of 24 Go
若手册格式错乱，请下载阅览PDF原文件
1. General description
The 74HC123; 74HCT123 are high-speed Si-gate CMOS devices and are pin compatible
with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC123; 74HCT123 are dual retriggerable monostable multivibrators with output
pulse width control by three methods:
1. The basic pulse is programmed by selection of an external resistor (R
EXT
) and
capacitor (C
EXT
).
2. Once triggered, the basic output pulse width may be extended by retriggering the
gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By
repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made
as long as desired. Alternatively an output delay can be terminated at any time by a
LOW-going edge on input nRD, which also inhibits the triggering.
3. An internal connection from nRD to the input gates makes it possible to trigger the
circuit by a HIGH-going signal at input nRD as shown in the function table.
Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower
input rise and fall times.
The 74HC123; 74HCT123 are identical to the 74HC423; 74HCT423 but can be triggered
via the reset input.
2. Features
n DC triggered from active HIGH or active LOW inputs
n Retriggerable for very long pulses up to 100 % duty factor
n Direct reset terminates output pulse
n Schmitt-trigger action on all inputs except for the reset input
n ESD protection:
u HBM JESD22-A114E exceeds 2000 V
u MM JESD22-A115-A exceeds 200 V
n Specified from −40 °Cto+85°C and from −40 °C to +125 °C
74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
Rev. 05 — 13 July 2009 Product data sheet
Downloaded from Elcodis.com electronic components distributor
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
