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See Technical Specifications

CD74HC138E +BOM

Encoders, Decoders, Multiplexers & Demultiplexers Line Decoder

Manufacturer:

Texas Instruments
Mfr.Part #:

CD74HC138E
Datasheet:

CD74HC138E Datasheet (PDF)
Technology Family:

HC
Number Of Channels:

1
Operating Temperature Range (°C):

-55 to 125
Rating:

Catalog
EDA/CAD Models:

Request Free CAD Models for CD74HC138E

CD74HC138E General Description

The CD74HC138E from Texas Instruments is a versatile decoder/demultiplexer IC that offers high-speed operation and a wide operating voltage range. With its ability to decode a three-bit address to eight output lines, this IC is perfect for addressing decoding in microprocessor-based systems, memory selection, and various digital logic applications. Its low power consumption makes it ideal for energy-efficient devices, while its range of package options ensures easy integration into different electronic systems

Key Features

Select One Of Eight Data Outputs Active Low for 138, Active High for 238
I/O Port or Memory Selector
Three Enable Inputs to Simplify Cascading
Typical Propagation Delay of 13ns at VCC = 5V, CL = 15pF, TA = 25°C
Fanout (Over Temperature Range)
- Standard Outputs . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . 15 LSTTL Loads
Wide Operating Temperature Range . . . –55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il1μA at VOL, VOH

Data sheet acquired from Harris Semiconductor

Description

The ’HC138, ’HC238, ’HCT138, and ’HCT238 are high speed silicon gate CMOS decoders well suited to memory address decoding or data routing applications. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low power Schottky TTL logic. Both circuits have three binary select inputs (A0, A1 and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs of the HC/HCT138 series will go low or which of the normally low outputs of the HC/HCT238 series will go high.

Two active low and one active high enables (E1\, E2\, and E3) are provided to ease the cascading of decoders. The decoder’s 8 outputs can drive 10 low power Schottky TTL equivalent loads.