74HCT123D 查看數據表（PDF） - Philips Electronics

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74HCT123D

Dual retriggerable monostable multivibrator with reset

Philips Electronics 

Philips Semiconductors

Dual retriggerable monostable

multivibrator with reset

Product specification

74HC/HCT123

Fig.4 Functional diagram.

FUNCTION TABLE

INPUTS

OUTPUTS

nRD nA nB

LX X

XH X

XX L

HL

↑

nQ

L

L(1)

L(1)

nQ

H

H(1)

H(1)

H↓

H

↑L

H

Note

1. If the monostable was triggered

before this condition was

established, the pulse will

continue as programmed.

H = HIGH voltage level

L = LOW voltage level

X = don’t care

↑ = LOW-to-HIGH transition

↓ = HIGH-to-LOW transition

= one HIGH level output pulse

= one LOW level output pulse

(1) For minimum noise generation,

it is recommended to ground pins 6 (2CEXT)

and 14 (1CEXT) externally to pin 8 (GND).

1998 Jul 08

Fig.5 Logic diagram.

4

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