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DM74LS139, DM74LS139J, DM74LS139SJX

Table of contents:
Info of DM74LS139
Info of DM74LS139J
Info of DM74LS139SJX

DM74LS139, DM74LS139J, DM74LS139SJX Selling Leads, Datasheet

MFG:FSC Package Cooled:DIP-16 D/C:03+

DM74LS139, DM74LS139J, DM74LS139SJX Picture

DM74LS139, DM74LS139J, DM74LS139SJX Datasheet download

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Part Number: DM74LS139

MFG: FSC

Package Cooled: DIP-16

D/C: 03+

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DM74LS139 General Description

These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications, 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 introduced by the decoder is negligible.

The LS138 decodes one-of-eight lines, based upon the conditions 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 expanding. A 24-line decoder can be implemented with no external 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 decoders 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.

DM74LS139 Maximum Ratings

Supply Voltage ....................................................................................7V
Input Voltage ......................................................................................7V
Operating Free Air Temperature Range
DM54LS and 54LS ......................................................-55 to +125
DM74LS .............................................................................0 to +70
Storage Temperature Range .........................................-65 to +150

DM74LS139 Features

* Designed specifically for high speed:
   Memory decoders
   Data transmission systems
* LS138 3-to-8-line decoders incorporates 3 enable inputs
   to simplify cascading and/or data reception
* LS139 contains two fully independent 2-to-4-line decoders/
   demultiplexers
* Schottky clamped for high performance
* Typical propagation delay (3 levels of logic)
   LS138 21 ns
   LS139 21 ns
* Typical power dissipation
   LS138 32 mW
   LS139 34 mW
* Alternate Military/Aerospace devices (54LS138,
   54LS139) are available. Contact a National Semiconductor
   Sales Office/Distributor for specifications.

DM74LS139 Connection Diagram

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