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2

Connection Diagram

Truth Table

(Note 2)

H

= HIGH Voltage Level

X

= Immaterial

L

= LOW Voltage Level

 = LOW-to-HIGH Transition.

Note 2: The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled;

i.e., data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs. Also applies to data I/O (A and B: 8-15) and

#2 control pins.

Inputs

Data I/O

Output Operation Mode

H

X

H or L

H or L

X

X

Isolation

H

X



X

X

X

Input

Input

H

X

X



X

X

L

H

X

X

L

X

L

H



X

L

X

Input

L

H

H or L

X

H

X

L

H



X

H

X

L

L

X

X

X

L

L

L

X



X

L

Output

Input

L

L

X

H or L

X

H

L

L

X



X

H