© Semiconductor Components Industries, LLC, 2004

September, 2004 − Rev. 3

1

Publication Order Number:

MC74VHC257/D

MC74VHC257

Quad 2−Channel Multiplexer

with 3−State Outputs

The MC74VHC257 is an advanced high speed CMOS quad

2−channel multiplexer fabricated with silicon gate CMOS technology.

It achieves high speed operation similar to equivalent Bipolar

Schottky TTL while maintaining CMOS low power dissipation.

It consists of four 2−input digital multiplexers with common select

(S) and enable (OE) inputs. When (OE) is held High, selection of data

is inhibited and all the outputs go Low.

The select decoding determines whether the A or B inputs get routed

to the corresponding Y outputs.

The inputs tolerate voltages up to 7 V, allowing the interface of 5 V

systems to 3 V systems.

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

S

Y0

B0

A0

Y1

B1

A1

GND

Y3

B3

A3

OE

B2

A2

Y2

Figure 1. Pin Assignment

SO−16

SO−16

D SUFFIX

CASE 751B

MARKING DIAGRAMS

1

8

9

16

1

8

16

9

VHC257

AWLYWW

VHC257

ALYW

TSSOP−16

DT SUFFIX

CASE 948F

ORDERING INFORMATION

EIAJ SO−16

M SUFFIX

CASE 966

VHC257

ALYW

A

= Assembly Location

L, WL

= Wafer Lot

Y

= Year

W, WW

= Work Week

16

9

1

8

Device

Package

MC74VHC257D

SO−16

48 Units/Rail

MC74VHC257DT

TSSOP−16

96 Units/Rail

MC74VHC257M

EIAJSO−16

50 Units/Rail

MC74VHC257DR2

2500 Tape & Reel

MC74VHC257DTR2

TSSOP−16 2500 Tape & Reel

MC74VHC257MEL

EIAJSO−16

2000 Tape & Reel

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

http://onsemi.com