CY74FCT16646T

CY74FCT162646T

3

Inputs

Function

OE

DIR

CLKAB

CLKBA

SAB

SBA

A

B

H

H

X

X

H or L

H or L

X

X

X

X

Input

Input

Isolation

Store A and B Data

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

L

L

H

H

X

H or L

X

X

L

H

X

X

Input

Output

Real Time A Data to Bus

Stored A Data to B 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 OE or DIR 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.

Cannot transfer data to A-bus and B-bus simultaneously.

BUS B

BUS A

DIR

L

OE

L

CLKAB

X

SAB

X

BUS B

BUS A

DIR

H

L

X

OE

L

L

H

CLKAB

X

SAB

X

X

X

SBA

X

X

X

BUS B

BUS A

DIR

H

OE

L

SAB

L

SBA

X

BUS A

BUS A

DIR

L

H

OE

L

L

SAB

X

H

SBA

H

X

Real-Time Transfer

Bus B to BusA

Real-Time Transfer

BusA to Bus B

Storage from

A and/or B

Transfer Stored Data

to A and/or B

CLKBA

X

CLKAB

X

CLKBA

X

SBA

L

CLKBA

X

CLKAB

X

Hor L

CLKBA

Hor L

X

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