4

H

H

X

X

L

X

Input

Output

Real-Time A Data to

B Bus

Real-Time A Data to

B Bus

H

H

H or L

X

H

X

Stored A Data to B

Bus

Stored A Data to B

Bus

H

L

H or L

H or L

H

H

Output

Output

Stored A Data to B

Bus and

Stored A Data to B

Bus

Stored B Data to A

Bus

Stored B Data to A

Bus

NOTES:

3. To prevent excess currents in the High-Z (isolation) modes, all I/O terminals should be terminated with 10k

Ω to 1MΩ resistors.

enabled; i.e., data at the bus pins will be stored on every low-to-high transition on the clock inputs.

5. Select Control = L: Clocks can occur simultaneously.

Select Control = H: Clocks must be staggered in order to load both registers.

FUNCTION TABLE

INPUTS

DATA I/O

OPERATION OR FUNCTION

CAB

CBA

SAB

SBA

A0 THRU A7

B0 THRU B7

651

652

CD74HC652, CD74HCT652

CD74HC652, CD74HCT652