Rev.2.00 Jan 31, 2006 page 1 of 7

HD74HC257

Quad. 2-to-1-line Data Selectors/Multiplexers

(with noninverted 3-state outputs)

REJ03D0601–0200

(Previous ADE-205-478)

Rev.2.00

Jan 31, 2006

Description

The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with bus lines in

a bus organized system. When the output control input line is taken high, the outputs of all four multiplexers are sent

into a high impedance state. When the output control line is low, the select input chooses whether the A or B input is

used.

Features

• High Speed Operation: t

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC257P

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74HC257FPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

HD74HC257RPEL

SOP-16 pin (JEDEC)

PRSP0016DG-A

(FP-16DNV)

RP

EL (2,500 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Function Table

Inputs

Output

Output Control

Select

A

B

Y

L

L

L

X

L

L

L

H

X

H

L

H

X

L

L

L

H

X

H

H

H

X

X

X

High impedance

Notes H: high level, L: low level, X: irrelevant