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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

4Y

3Y

2Y

1Y

A/B

OE

4B

4A

3B

3A

2B

2A

1B

1A

4

2

3

7

5

6

9

11

10

12

14

13

1

15

Pin numbers shown are for the D, DB, J, NS, PW, RGY, and W packages.

SN54LVC257A, SN74LVC257A

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCAS294N – JANUARY 1993 – REVISED JUNE 2005

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

FUNCTION TABLE

INPUTS

OUTPUT

Y

OE

A/B

A

B

H

X

X

X

Z

L

L

L

X

L

L

L

H

X

H

L

H

X

L

L

L

H

X

H

H

LOGIC DIAGRAM (POSITIVE LOGIC)

2