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74LS251 - 3-STATE 1-of-8 Line Data Selector/Multiplexer

General Description

These data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources, and feature a strobe-controlled 3-STATE output.

The strobe must be at a low logic level to enable these devices.

The 3STATE outputs permit direct connection to a common bus.

Key Features

  • s 3-STATE version of DM74LS151 s Interface directly with system bus s Perform parallel-to-serial conversion s Permit multiplexing from N-lines to one line s Complementary outputs provide true and inverted data s Maximum number of common outputs: 129 s Typical propagation delay time (D to Y): 17 ns s Typical power dissipation: 35 mW Ordering Code: Order Number DM74LS251M DM74LS251N Package Number M16A N16E Package.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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DM74LS251 3-STATE 1-of-8 Line Data Selector/Multiplexer August 1986 Revised March 2000 DM74LS251 3-STATE 1-of-8 Line Data Selector/Multiplexer General Description These data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources, and feature a strobe-controlled 3-STATE output. The strobe must be at a low logic level to enable these devices. The 3STATE outputs permit direct connection to a common bus. When the strobe input is HIGH, both outputs are in a highimpedance state in which both the upper and lower transistors of each totem-pole output are OFF, and the output neither drives nor loads the bus significantly. When the strobe is LOW, the outputs are activated and operate as standard TTL totem-pole outputs.