74LS139 Dual 2-Line to 4-Line Decoder/Demultiplexer
High-speed decoder/demultiplexer with Schottky clamping for memory systems
- Supply Voltage (VCC): 7 V
- Input Voltage (VI): 7 V
- Operating free-air temperature range: 0°C to +70°C
- Storage temperature range: -65°C to +150°C
Features:
- Designed for high-speed memory decoders and data transmission systems
- Contains two independent 2-to-4-line decoders/demultiplexers
- Schottky clamped for high performance
- Propagation delay (3 levels of logic) is 21 ns
The 74LS139 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. 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.
Related Document: 74LS139 IC Datasheet
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