74LVC1G123

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Product data sheet

Rev. 4 — 27 November 2013

5 of 31

NXP Semiconductors

74LVC1G123

Single retriggerable monostable multivibrator; Schmitt trigger inputs

6.2 Pin description

7.

Functional description

[1]

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.

[2]

If the monostable was triggered before this condition was established, the pulse continues as programmed.

Table 3.

Pin description

Symbol

Pin

Description

A

1

negative-edge triggered input

B

2

positive-edge triggered input

CLR

3

direct reset LOW and positive-edge triggered input

GND

4

ground (0 V)

Q

5

active HIGH output

CEXT

6

external capacitor connection

REXT/CEXT

7

external resistor and capacitor connection

8

supply voltage

Table 4.

Function table[1]

Input

Output

CLR

A

B

Q

LX

X

L

XH

XL[2]

XX

L

L[2]

HL



H



H



LH