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54LS138 Datasheet 1-of-8 Decoder/demultiplexer

Manufacturer: Motorola Semiconductor (now NXP Semiconductors)

Overview: ( DataSheet : www.DataSheet4U.com ) 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) V CC 16 O0 15 O1 14 O2 13 O3 12 O4 11 O5 10 9 O6 J SUFFIX CERAMIC CASE 620-09 16 1 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 A0 2 A1 3 A2 4 E1 5 E2 6 E3 7 O7 8 GND 16 1 N SUFFIX PLASTIC CASE 648-08 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. LOGIC DIAGRAM A2 3 2 A1 1 A0 4 E1 5 E2 E3 6 LOGIC SYMBOL V CC = PIN 16 GND = PIN 8 = PIN NUMBERS A0 A1 A2 1 2 3 456 12 3 E O0 O1 O2 O3 O4 O5 O6 O7 15 14 13 12 11 10 9 7 V CC = PIN 16 GND = PIN 8 7 9 10 11 12 13 14 15 O7 O6 O5 O4 O3 O2 O1 O0 FAST AND LS TTL DATA 5-230 www.DataSheet4U.

General Description

The LS138 is a high speed 1-o

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.

54LS138 Distributor

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