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HD74HC138 - 3-to-8-line Decoder/Demultiplexer

Description

The HD74HC138 has 3 binary select inputs (A, B and C).

If the device is enabled these inputs determine which one of the eight normally high outputs will go low.

Two active low and one active high enables (G1, G2A and G2B) are provided to ease the cascading of decoders.

Features

  • High Speed Operation: tpd (A, B, C to Y) = 16.5 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 V to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Enable G1 X X L H H H H H H H H G2A X H X L L L L L L L L G2B H X X L L L L L L L L Select C X X X L L L L H H H H B X X X L L H H L L H H A X X X L H L H L H L H Outputs Y0 H H.

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Other Datasheets by Hitachi Semiconductor (now Renesas)

Part Number Description
HD74HC131 3-to-8-line Decoder/Demultiplexer
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Full PDF Text Transcription

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HD74HC138 3-to-8-line Decoder/Demultiplexer Description The HD74HC138 has 3 binary select inputs (A, B and C). If the device is enabled these inputs determine which one of the eight normally high outputs will go low. Two active low and one active high enables (G1, G2A and G2B) are provided to ease the cascading of decoders. Features • • • • • High Speed Operation: tpd (A, B, C to Y) = 16.
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