M54HC237

2/10

IEC LOGIC SYMBOLS

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care

PIN N°

SYMBOL

NAME AND FUNCTION

1, 2, 3

A, B, C

Data Inputs

4GL

Latch Enable Input

5G2

Data Enable Input (Active

LOW)

6

G1

Data Enable Input (Active

HIGH)

15, 14, 13,

12, 11, 10, 9,

7

Y0 to Y7

Decoder Outputs

8

GND

Ground (0V)

16

Positive Supply Voltage

INPUTS

OUTPUTS

ENABLE

SELECT

GL

G2

G1

C

B

A

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

X

X

L

X

X

X

LLLLLLLL

X

H

XXXX

L

LLLLLLL

LL

H

LLL

H

LLLLLLL

LL

H

L

L

H

L

H

LLLLLL

LL

H

L

H

L

LL

H

LLLLL

LL

H

L

H

H

LLL

H

LLLL

LL

H

H

LL

LLLL

H

LLL

LL

H

H

L

H

LLLLL

H

L

L

LL

H

H

H

L

L

LLLLL

H

L

L

L

HHHH

L

LLLLLL

H

H

L

H

X

X

X

Outputs corresponding to stored address H: all others L