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MC74LCX138DTR2G

Low-Voltage CMOS 3-to-8 Decoder/Demultiplexer

ON Semiconductor 

MC74LCX138

Low-Voltage CMOS 3-to-8

Decoder/Demultiplexer

With 5 V−Tolerant Inputs

The MC74LCX138 is a high performance, 3−to−8

decoder/demultiplexer operating from a 2.3 to 3.6 V supply. High

impedance TTL compatible inputs significantly reduce current

loading to input drivers while TTL compatible outputs offer improved

switching noise performance. A VI specification of 5.5 V allows

MC74LCX138 inputs to be safely driven from 5 V devices. The

MC74LCX138 is suitable for memory address decoding and other

TTL level bus−oriented applications.

The MC74LCX138 high−speed 3−to−8 decoder/demultiplexer

accepts 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.

Current drive capability is 24 mA at the outputs.

Features

 Designed for 2.3 V to 3.6 V VCC Operation

 5 V Tolerant Inputs − Interface Capability With 5 V TTL Logic

 LVTTL Compatible

 LVCMOS Compatible

 24 mA Balanced Output Sink and Source Capability

 Near Zero Static Supply Current (10 mA) Substantially Reduces

System Power Requirements

 Latchup Performance Exceeds 500 mA

 ESD Performance: Human Body Model >2000 V

Machine Model >200 V

 NLV Prefix for Automotive and Other Applications Requiring

Unique Site and Control Change Requirements; AEC−Q100

Qualified and PPAP Capable

 These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

http://onsemi.com

16

1

MARKING

DIAGRAMS

16

SOIC−16

D SUFFIX

CASE 751B

LCX138G

AWLYWW

1

16

16

1

TSSOP−16

DT SUFFIX

CASE 948F

LCX

138

ALYWG

G

1

A

WL, L

Y

WW, W

G or G

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

(Note: Microdot may be in either location)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 3 of this data sheet.

 Semiconductor Components Industries, LLC, 2012

1

October, 2012 − Rev. 10

Publication Order Number:

MC74LCX138/D

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