CY74FCT16652T

CY74FCT162652T

3

Inputs

Operation or Function

OEAB

OEBA

CLKAB

CLKBA

SAB

SBA

A

B

L

L

H

H

H or L

H or L

X

X

X

X

Input

Input

Isolation

Store A and B Data

X

H

H

H

H or L

X

X

X

Input

Input

Output

Store A, Hold B

Store A in Both Registers

L

L

X

L

H or L

X

X

X

Input

Input

Hold A, Store B

Store B in both Registers

L

L

L

L

X

X

X

H or L

X

X

L

H

Output

Input

Real Time B Data to A Bus

Stored B Data to A Bus

H

H

H

H

X

H or L

X

X

L

H

X

X

Input

Output

Real Time 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 B Data to A Bus

Notes:

1.

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

=LOW-to-HIGH Transition

2.

The data output functions may be enabled or disabled by various signals at the OEAB or OEBA inputs. Data input functions are always enabled, i.e., data at

the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.

3.

Select control=L; clocks can occur simultaneously.

Select control=H; clocks must be staggered to load both registers.