54HC4538 查看數據表（PDF） - STMicroelectronics

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产品描述 (功能)

比赛名单

54HC4538

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

STMicroelectronics 

M54/M74HC4538

FUNCTIONAL DESCRIPTION (continued)

RESET OPERATION

CD is normally high. If CD is low, the trigger is not

effective because Q output goes low and trigger

control flip-flop is reset.

Also transistor Op is turned on and Cx is charged

quicky to VCC. This means if CD input goes low, the

IC becomes waiting state both in operating and non

operating state.

TRUTH TABLE

INPUTS

A

B

CD

H

H

X

L

H

H

X

H

L

H

X

X

L

OUTPUTS

Q

Q

L

H

L

H

L

H

INPUT AND OUTPUT EQUIVALENT CIRCUIT

NOTE

OUTPUT ENABLE

INHIBIT

INHIBIT

OUTPUT ENABLE

INHIBIT

PIN DESCRIPTION

PIN No

1, 15

2, 14

3, 13

4, 12

5, 11

6, 10

7, 9

8

16

SYMBOL

1T1, 2T1

1T2, 2T2

1CD, 2CD

1A, 2A

1B, 2B

Q1, Q2

Q1, Q2

GND

VCC

NAME AND FUNCTION

External Capacitor

Connections

External Resistor/Capacitor

Connections

Direct Reset Inputs (Active

LOW)

Trigger Inputs (LOW to

HIGH, Edge-Triggered)

Trigger Inputs (HIGH to

LOW, Edge-Triggered)

Pulse Outputs

Complementary Pulse Outputs

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOL

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