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SN54LS138 - 1-OF-8 DECODER/ DEMULTIPLEXER

Description

The LS138 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Schottky barrier diode process.

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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 enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four LS138s and one inverter. (See Figure a. ) The LS138 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 use.

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📁 Similar Datasheet

Part Number Description Manufacturer
SN54LS138 3-Line To 8-Line Decoders/Demultiplexers Texas Instruments
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Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN54LS13 SCHMITT TRIGGERS DUAL GATE/HEX INVERTER
SN54LS132 QUAD 2-INPUT SCHMITT TRIGGER NAND GATE
SN54LS133 13-INPUT NAND GATE
SN54LS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SN54LS139 DUAL 1-OF-4 DECODER/ DEMULTIPLEXER

Full PDF Text Transcription

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1-OF-8 DECODER/ DEMULTIPLEXER The LSTTL / MSI SN54 / 74LS138 is a high speed 1-of-8 Decoder / Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LS138 devices or to a 1-of-32 decoder using four LS138s and one inverter. The LS138 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.
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