M74HC4543

2/10

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care

↑ : Same as above combinations

### : Depends upon the BCD code previously applied when LD =’H’

PIN No

SYMBOL

NAME AND FUNCTION

1

LD

Latch Disable Input

(Active HIGH)

5, 3, 2, 4

A to D

Address (Data) Inputs

6

PH

Phase Input (Active

HIGH)

7

BI

Blanking Input (Active

HIGH)

9, 10, 11, 12,

13, 15, 14

a to g

Segment Outputs

8

GND

Ground (0V)

16

Positive Supply Voltage

INPUT

OUTPUT

DISPLAY MODE

LD

BI

PH

D

C

B

A

a

b

c

d

e

f

g

X

H

L

X

X

X

X

L

L

L

L

L

L

L

BLANK

H

LLL

LL

L

H

H

H

H

H

H

L

0

H

LLL

LL

H

L

H

H

L

LLL

1

H

L

L

L

LH

LH

H

L

H

HLH

2

H

L

L

L

L

H

HHH

HH

L

L

H

3

H

LLL

H

L

LL

H

H

L

L

H

H

4

H

L

L

L

H

L

HH

L

H

H

L

HH

5

H

L

L

L

HH

L

H

L

HH

HHH

6

H

LLL

H

H

H

H

H

H

L

LLL

7

H

L

LH

L

L

LH

H

H

H

H

H

H

8

H

L

L

H

L

L

HHH

HH

L

H

H

9

H

L

L

H

L

H

X

L

L

L

L

L

L

L

BLANK

H

L

L

H

H

X

X

L

L

L

L

L

L

L

BLANK

L

L

L

X

X

X

X

#####

#####

↑↑

H

↑

INVERSE OF ABOVE OUTPUT LEVEL

DISPLAY AS

ABOVE