DM54LS251J中文资料TRI-STATE® Data Selectors/Multiplexers数据手册TI规格书

描述 Description

General Description
These data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources, and feature a strobe-controlled TRI-STATE output. The strobe must be at a low logic level to enable these devices. The TRI-STATE outputs permit direct connection to a common bus. When the strobe input is high, both outputs are in a high-imped ance 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.

特性 Features

YTRI-STATE version of LS151
YInterface directly with system bus
YPerform parallel-to-serial conversion
YPermit multiplexing from N-lines to one line
YComplementary outputs provide true and inverted data
Maximum number of common outputs
        54LS        49
        74LS        129
Typical propagation delay time (D to Y)
   54LS           17 ns
  74LS          17 ns
Typical power dissipation
   54LS         35 mW
   74LS         35 mW