SN74LS251 - 具有三态输出的 8 线路到 1 线路数据选择器/多路复用器

SN74LS251是TI德州仪器公司的一款解码器/编码器/多路复用器产品，SN74LS251是具有三态输出的 8 线路到 1 线路数据选择器/多路复用器，本站介绍了SN74LS251的封装应用图解、特点和优点、功能等，并给出了与SN74LS251相关的TI元器件型号供参考。

SN74LS251 - 具有三态输出的 8 线路到 1 线路数据选择器/多路复用器 - 解码器/编码器/多路复用器 - 特殊逻辑 - 德州仪器

产品描述

These monolithic data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources and feature a strobe-controlled three-state output. The strobe must be at a low logic level to enable these devices. The three-state outputs permit a number of outputs to be connected to a common bus. When the strobe input is high, both outputs are in a high-impedance 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.

To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable time is shorter than the average output enable time. The SN54251 and SN74251 have output clamp diodes to attenuate reflections on the bus line.

产品特性

Three-State Versions of '151, 'LS151, 'S151
Three State Outputs Interface Directly with System Bus
Perform Parallel-to-Serial Conversion
Permit Multiplexing from N-Lines to One Line
Complementary Outputs Provide True and Inverted Data
Fully Compatible with Most TTL Circuits

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