TABLE 1. Pin Description (Continued)

Symbol

Pins

Type

Name and Function

B0

27

I/O

Data input with special threshold circuitry to reject noise/Open Collector output,

High current drive

B1

26

I/O

B2

24

I/O

B3

23

I/O

B4

21

I/O

B5

20

I/O

B6

19

I/O

B7

17

I/O

OEB 0

15

I

Enables the B outputs when both pins are low

OEB 1

16

I

OEA

2

I

Enables the A outputs when High

LE

28

I

Latched when High (a special delay feature is built in for proper enabling

times)

V

X

14

I

Clamping voltage keeping V

use)

www.national.com

5