© 2000 Fairchild Semiconductor Corporation

DS012466

www.fairchildsemi.com

May 1995

Revised September 2000

74LCX257

Low Voltage Quad 2-Input Multiplexer

with 5V Tolerant Inputs and Outputs

General Description

The LCX257 is a quad 2-input multiplexer with 3-STATE

outputs. Four bits of data from two sources can be selected

using a Common Data Select input. The four outputs

present the selected data in true (non inverted) form. The

outputs may be switched to a high impedance state by

placing a logic HIGH on the common Output Enable (OE)

input, allowing the outputs to interface directly with bus-ori-

ented systems.

The 74LCX257 is fabricated with advanced CMOS technol-

ogy to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

s 5V tolerant inputs and outputs

s Power down high impedance inputs and outputs

s Supports live insertion/withdrawal (Note 1)

s Implements patented noise/EMI reduction circuitry

s Latch-up performance exceeds 500 mA

s ESD performance:

Human body model

> 2000V

Machine model

> 200V

Note 1: To ensure the high-impedance state during power up or down, OE

resistor is determined by the current-sourcing capability of the driver.

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number

Package Number

Package Description

74LCX257M

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

74LCX257SJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX257MTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names

Description

S

Common Data Select Input

OE

3-STATE Output Enable Input

Data Inputs from Source 0

Data Inputs from Source 1

3-STATE Multiplexer Outputs