9397 750 13807

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet

Rev. 03 — 12 November 2004

5 of 19

Philips Semiconductors

74HC237

3-to-8 line decoder, demultiplexer with address latches

6.2 Pin description

7.

Functional description

7.1 Function table

[1]

H = HIGH voltage level;

L = LOW voltage level;

X = don’t care.

Table 3:

Pin description

Symbol

Pin

Description

A0

1

data input 0

A1

2

data input 1

A2

3

data input 2

LE

4

latch enable input (active LOW)

E1

5

data enable input 1 (active LOW)

E2

6

data enable input 2 (active HIGH)

Y7

7

multiplexer output 7

GND

8

ground (0 V)

Y6

9

multiplexer output 6

Y5

10

multiplexer output 5

Y4

11

multiplexer output 4

Y3

12

multiplexer output 3

Y2

13

multiplexer output 2

Y1

14

multiplexer output 1

Y0

15

multiplexer output 0

16

positive supply voltage

Table 4:

Function table

Enable

Input

Output

LE

E1

E2

A0

A1

A2

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

H

L

H

X

X

X

stable

X

H

X

X

X

X

L

LLLLLLL

X

X

LX

X

X

LLLLLLLL

LLH

L

LLH

L

LLLLLL

H

L

LLH

LLLLLL

LH

LLLH

LLLLL

H

H

LLLLH

LLLL

LLH

L

LLLH

LLL

H

L

H

L

LLLLH

LL

LH

H

L

LLLLLH

L

H

H

H

L

LLLLLLH