Datasheet4U Logo Datasheet4U.com

SN54LS138 Datasheet 1-of-8 Decoder/ Demultiplexer

Manufacturer: Motorola Semiconductor (now NXP Semiconductors)

Overview: 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. SN54/74LS138 1-OF-8 DECODER/ DEMULTIPLEXER LOW POWER SCHOTTKY • • • • • Demultiplexing Capability Multiple Input Enable for Easy Expansion Typical Power Dissipation of 32 mW Active Low Mutually Exclusive Outputs Input Clamp Diodes Limit High Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 O0 15 O1 14 O2 13 O3 12 O4 11 O5 10 O6 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1 J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 1 A0 2 A1 3 A2 4 E1 5 E2 6 E3 7 O7 8 GND PIN NAMES A0 – A2 E1, E2 E3 O0 – O7 Address Inputs Enable (Active LOW) Inputs Enable (Active HIGH) Input Active LOW Outputs (Note b) LOADING (Note a) HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) U.L. 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.

General Description

The LS138 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Sc

Key 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.

Similar Datasheet

Brand Logo Part Number Description Manufacturer
Texas Instruments Logo SN54LS138 3-Line To 8-Line Decoders/Demultiplexers Texas Instruments

More Datasheets from 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
SN54LS13J SCHMITT TRIGGERS DUAL GATE/HEX INVERTER
SN54LS10 TRIPLE 3-INPUT NAND GATE
SN54LS107A DUAL JK NEGATIVE EDGE-TRIGGERED FLIP-FLOP
SN54LS109A DUAL JK POSITIVE EDGE-TRIGGERED FLIP-FLOP
SN54LS11 TRIPLE 3-INPUT AND GATE

SN54LS138 Distributor