M54HC4520 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M54HC4520

HC4520 DUAL 4 BIT BINARY COUNTER HC4518 DUAL DECADE COUNTER

STMicroelectronics 

M54/M74HC4518/4520

TRUTH TABLE

CLOCK

L

X

H

X

X: Don’t Care Z: High Impedance

INPUTS

ENABLE

H

X

L

X

PIN DESCRIPTION

PIN No

1, 9

2, 10

3, 4, 5, 6

7, 15

11, 12, 13,

14

8

16

SYMBOL

1CLOCK,

2CLOCK

1ENABLE,

2ENABLE

1Q0 to 1Q3

1CLEAR,

2CLEAR

2Q0 to 2Q3

GND

VCC

NAME AND FUNCTION

Clock Inputs (LOW to

HIGH, Edge-triggered)

Clock Enable Inputs

Data Outputs

Asynchronous Reset

Inputs (Active LOW)

Data Outputs

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOLS

HC4518

CLEAR

L

L

L

L

L

L

H

FUNCTION

INCREMENT COUNTER

INCREMENT COUNTER

NO CHANGE

NO CHANGE

NO CHANGE

NO CHANGE

Q0 THRU Q3 = L

INPUT AND OUTPUT EQUIVALENT CIRCUIT

HC4520

4/13

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