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Description
LOW POWER SCHOTTKY
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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 DM74LS138 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 DM74LS139 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.
Features
● Designed specifically for high speed:
Memory decoders
Data transmission systems
● DM74LS138 3-to-8-line decoders incorporates 3 enable inputs to simplify cascading and/or data reception
● DM74LS139 contains two fully independent 2-to-4-line decoders/demultiplexers
● Schottky clamped for high performance
● Typical propagation delay (3 levels of logic)
DM74LS138 21 ns
DM74LS139 21 ns
● Typical power dissipation
DM74LS138 32 mW
DM74LS139 34 mW
Preview of the first 3 pages of the data sheet
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10000 buyer reviews from United States
Arthur Pieters
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01/01/2021
Laura Baker
Length of registration:7 years
I recently purchased a 74LS139N integrated circuit from Utsource and I am very pleased with the qu and performance of the product. The circuit was tested thoroughly before being shipped and it worked perfectly. The circuit was packaged securely and arrived in perfect condition. I would highly recommend Utsource for anyone looking for qu integrated circuits.
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03/17/2023
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74LS139
74LS139 has several brands around the world that may have alternate names for 74LS139 due to regional differences or acquisition. 74LS139 may also be known as the following names:
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