Part # 54LS138 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: 54LS138 DM54LS138 54LS139 DM54LS139 Decoders Demultiplexers

Part Details:

54LS139DM54LS139DM74LS139 54LS138DM54LS138DM74LS138 June 1989 54LS138 DM54LS138 DM74LS13854LS139 DM54LS139 DM74LS139Decoders Demultiplexers General DescriptionThese Schottky-clamped circuits are designed to be used in Schottky diodes to suppress line-ringing and simplify system high-performance memory-decoding or data-routing appli- design cations requiring very short propagation delay times Inhigh-performance memory systems these decoders can be Features used to minimize the effects of system decoding When Y Designed specifically for high speed used with high-speed memories the delay times of these Memory decoders decoders are usually less than the typical access time of the Data transmission systems memory This means that the effective system delay intro- Y LS138 3-to-8-line decoders incorporates 3 enable in- duced by the decoder is negligible puts to simplify cascading and or data reception The LS138 decodes one-of-eight lines based upon the con- Y LS139 contains two fully independent 2-to-4-line decod- ditions at the three binary select inputs and the three enable DecodersDemultiplexers ers demultiplexers inputs Two active-low and one active-high enable inputs Y Schottky clamped for high performance reduce the need for external gates or inverters when ex- Y Typical propagation delay (3 levels of logic) panding A 24-line decoder can be implemented with no ex- LS138 21 ns ternal inverters and a 32-line decoder requires only one LS139 21 ns inverter An enable input can be used as a data input for Y demultiplexing applications Typical power dissipation LS138 32 mW The LS139 comprises two separate two-line-to-four-line de- LS139 34 mW coders in a single package The active-low enable input can Y Alternate Military Aerospace devices (54LS138

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54LS138.pdf Datasheet