Decoders/demultiplexers - National Semiconductor

These Schottky-clamped circuits 54LS138 DM54LS138 DM74LS138 54LS139 DM54LS139 DM74LS139 are designed to be used in high-performance memory-decoding or data-routing appli- cations, requiring very short propagation delay times. In high-performance memory systems these decoders CAN be used to minimize the effects of system decoding. When used with high-speed Memories the delay times of these decoders are usually less than the typical access time of the memory. This means that the effective system delay intro- duced by the decoder is negligible. The LS138 decodes one-of-eight lines, based upon the con- ditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external Gates or inverters when ex- panding. A 24-line decoder CAN be implemented with no ex- ternal inverters, and a 32-line decoder requires only one inverter. An enable input CAN be used as a data input for demultiplexing applications. The LS139 comprises two separate two-line-to-four-line de- coders in a single package. The active-low enable input CAN be used as a data line in demultiplexing applications. All of these decoders/demultiplexers feature fully buffered inputs, presenting only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky Diodes to suppress line-ringing and simplify system design. By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
DM54LS138W Rochester Electronics LLC Decoder/Driver, LS Series, Inverted Output, TTL, CDFP16, CERAMIC, DFP-16
DM54LS138E/883 Rochester Electronics LLC Decoder/Driver, LS Series, Inverted Output, TTL, CQCC20, CERAMIC, LCC-20
DM54LS138J Rochester Electronics LLC Decoder/Driver, LS Series, Inverted Output, TTL, CDIP16, CERAMIC, DIP-16
DM54LS138W/883 Rochester Electronics LLC Decoder/Driver, LS Series, Inverted Output, TTL, CDFP16
DM54LS138J/883 Rochester Electronics LLC Decoder/Driver, LS Series, Inverted Output, TTL, CDIP16
DM54LS138 's PackagesDM54LS138 's pdf datasheet
54LS138
DM74LS138
54LS139
DM54LS139
DM74LS139




DM54LS138 Pinout, Pinouts
DM54LS138 pinout,Pin out
This is one package pinout of DM54LS138,If you need more pinouts please download DM54LS138's pdf datasheet.

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