74LCX257 datasheet, PDF - EEWORLD Datasheet

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74LCX257: DescriptionLOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE); File Size224KB，13 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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74LCX257 Overview

LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE)

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74LCX257

LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER

WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE)

5V TOLERANT INPUTS AND OUTPUTS

HIGH SPEED:

= 6.0 ns (MAX.) at V

= 3V

POWER DOWN PROTECTION ON INPUTS

AND OUTPUTS

SYMMETRICAL OUTPUT IMPEDANCE:

| = I

= 24mA (MIN) at V

= 3V

PCI BUS LEVELS GUARANTEED AT 24 mA

BALANCED PROPAGATION DELAYS:

PLH

≅

PHL

OPERATING VOLTAGE RANGE:

(OPR) = 2.0V to 3.6V (1.5V Data

Retention)

PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

LATCH-UP PERFORMANCE EXCEEDS

500mA (JESD 17)

ESD PERFORMANCE:

HBM > 2000V (MIL STD 883 method 3015);

MM > 200V

SOP

TSSOP

Table 1: Order Codes

PACKAGE

SOP

TSSOP

T&R

74LCX257MTR

74LCX257TTR

DESCRIPTION

The 74LCX257 is a low voltage CMOS QUAD 2

CHANNEL MULTIPLEXER (3-STATE) fabricated

with sub-micron silicon gate and double-layer

metal wiring C

MOS technology. It is ideal for low

power and high speed 3.3V applications; it can be

interfaced to 5V signal environment for both inputs

and outputs.

Figure 1: Pin Connection And IEC Logic Symbols

It is composed of four independent 2 channel

multiplexers with common SELECT and ENABLE

(OE) INPUT. The 74LCX257 is a non-inverting

multiplexer. When the ENABLE INPUT is held

"High", all outputs become in high impedance

state. If SELECT INPUT is held "Low", "A" data is

selected, when SELECT INPUT is "High", "B" data

is chosen.

It has same speed performance at 3.3V than 5V

AC/ACT family, combined with a lower power

consumption.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

September 2004

Rev. 4

1/13

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