MC74LCX138 Motorola, MC74LCX138 Datasheet

MC74LCX138

Manufacturer Part Number

MC74LCX138

Description

Low-Voltage CMOS 1-of-8 Decoder/Demultiplexer

Manufacturer

Motorola

Datasheet

1.MC74LCX138.pdf (8 pages)

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Low-Voltage CMOS 1-of-8

Decoder/Demultiplexer

With 5V-Tolerant Inputs

demultiplexer operating from a 2.7 to 3.6V supply. High impedance TTL

compatible inputs significantly reduce current loading to input drivers

while TTL compatible outputs offer improved switching noise

performance. A V I specification of 5.5V allows MC74LCX138 inputs to be

safely driven from 5V devices. The MC74LCX138 is suitable for memory

address decoding and other TTL level bus oriented applications.

three binary weighted inputs (A0, A1, A2) and, when enabled, provides

eight mutually exclusive active–LOW outputs (O0–O7). The LCX138

features three Enable inputs, two active–LOW (E1, E2) and one

active–HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW,

and E3 is HIGH. This multiple enabled function allows easy parallel

expansion of the device to a 1–of–32 (5 lines to 32 lines) decoder with just

four LCX138 devices and one inverter (See Figure 1). The LCX138 can

be used as an 8–output demultiplexer by using one of the active–LOW

Enable inputs as the data input and the other Enable inputs as strobes.

The Enable inputs which are not used must be permanently tied to their

appropriate active–HIGH or active–LOW state.

11/96

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Motorola, Inc. 1996

Designed for 2.7 to 3.6V V CC Operation

5V Tolerant Inputs — Interface Capability With 5V TTL Logic

LVTTL Compatible

LVCMOS Compatible

24mA Balanced Output Sink and Source Capability

Near Zero Static Supply Current (10 A) Substantially Reduces System

Power Requirements

Latchup Performance Exceeds 500mA

ESD Performance: Human Body Model >2000V; Machine Model >200V

The MC74LCX138 is a high performance, 1–of–8 decoder/

The MC74LCX138 high–speed 1–of–8 decoder/demultiplexer accepts

Current drive capability is 24mA at the outputs.

Pinout: 16–Lead Plastic Package (Top View)

V CC

GND

PIN NAMES

Pins

A0–A2

E1–E2

O0–O7

REV 1

DECODER/DEMULTIPLEXER

MC74LCX138

LOW–VOLTAGE CMOS

Function

Address Inputs

Enable Inputs

Enable Input

Outputs

PLASTIC SOIC EIAJ

PLASTIC TSSOP

PLASTIC SSOP

PLASTIC SOIC

CASE 751B–05

CASE 940B–03

CASE 948F–01

CASE 966–01

SD SUFFIX

DT SUFFIX

M SUFFIX

D SUFFIX

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