3

PS2004A 03/09/96

PI74FCT138/238T

1-OF-8 DECODER

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PI74FCT238T Product Pin Configuration

Inputs

Outputs

Function

HXXXXX

LLLLLLLL

Disable

XHXXXX

LLLLLLLL

Disable

X

X

L

X

X

X

LLLLLLLL

Disable

L

L

H

L

L

L

H

LLLLLLL

A2-0 = 0

L

L

H

H

L

L

L

H

LLLLLL

A2-0 = 1

L

L

H

L

H

L

LL

H

LLLLL

A2-0 = 2

L

L

H

H

H

L

LLL

H

LLLL

A2-0 = 3

L

L

H

L

L

H

LLLL

H

LLL

A2-0 = 4

L

L

H

H

L

H

LLLLL

H

L

L

A2-0 = 5

L

L

H

L

H

H

LLLLLL

H

L

A2-0 = 6

L

L

HHHH

LLLLLLL

H

A2-0 = 7

Note:

1. H = HIGH Voltage Level

L = LOW Voltage Level

X = Don't Care

PI74FCT238T Product Pin Description

Pin Name

Description

Address Inputs

Enable Inputs (Active LOW)

Enable Input (Active HIGH)

Outputs (Active HIGH)

1

16

2

15

3

14

4

13

5

12

6

11

7

10

8

GND

9

16-PIN

Q16

S16

W16