74HC123(2001) 查看數據表（PDF） - STMicroelectronics

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74HC123
(Rev.:2001)

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

STMicroelectronics 

M74HC123

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

1,9

2, 10

3, 11

4, 12

7

13, 5

14, 6

15

8

16

SYMBOL

1A, 2A

1B, 2B

1 CLR

2 CLR

1Q, 2Q

2RX/CX

1Q, 2Q

1CX

2CX

1RX/CX

GND

Vcc

NAME AND FUNCTION

Trigger Inputs (Negative

Edge Triggered)

Trigger Inputs (Positive

Edge Triggered)

Direct Reset LOW and

trigger Action at Positive

Edge

Outputs (Active Low)

External Resistor

Capacitor Connection

Outputs (Active High)

External Capacitor

Connection

External Resistor

Capacitor Connection

Ground (0V)

Positive Supply Voltage

TRUTH TABLE

A

X

H

L

L

X

X : Don’t Care

INPUTS

B

H

L

X

H

X

CLR

H

H

H

H

L

OUTPUTS

Q

Q

L

H

L

H

L

H

NOTE

OUTPUT ENABLE

INHIBIT

INHIBIT

OUTPUT ENABLE

OUTPUT ENABLE

INHIBIT

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