74HC123NB

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74HC123NB 数据手册

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Rev. 05 — 13 July 2009

Product data sheet

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

I DC triggered from active HIGH or active LOW inputs

I Retriggerable for very long pulses up to 100 % duty factor

I Direct reset terminates output pulse

I Schmitt-trigger action on all inputs except for the reset input

I ESD protection:

N HBM JESD22-A114E exceeds 2000 V

N MM JESD22-A115-A exceeds 200 V

I Speciﬁed from −40 °C to +85 °C and from −40 °C to +125 °C

12 3 4 5 6 7...24

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型号	品牌	获取价格	描述	数据表
74HC123N-B	PHILIPS	获取价格	Monostable Multivibrator, CMOS, PDIP16
74HC123PW	NXP	获取价格	Dual retriggerable monostable multivibrator with reset
74HC123PW	NEXPERIA	获取价格	Dual retriggerable monostable multivibrator with resetProduction
74HC123PW,112	NXP	获取价格	74HC(T)123 - Dual retriggerable monostable multivibrator with reset TSSOP 16-Pin
74HC123PW,118	NXP	获取价格	74HC(T)123 - Dual retriggerable monostable multivibrator with reset TSSOP 16-Pin
74HC123PW-Q100	NXP	获取价格	HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, 4.40 MM, PLASTIC, MO-153, SOT403-1, T
74HC123PW-Q100	NEXPERIA	获取价格	Dual retriggerable monostable multivibrator with reset
74HC123PW-Q100,118	NXP	获取价格	74HC(T)123-Q100 - Dual retriggerable monostable multivibrator with reset TSSOP 16-Pin
74HC123PW-T	NXP	获取价格	IC HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, 4.40 MM, PLASTIC, MO-153, SOT-403-
74HC123-Q100	NEXPERIA	获取价格	Dual retriggerable monostable multivibrator with reset