CY74FCT257T - 具有三态输出的四路 2 选 1 数据选择器/多路复用器

CY74FCT257T是TI德州仪器公司的一款解码器/编码器/多路复用器产品，CY74FCT257T是具有三态输出的四路 2 选 1 数据选择器/多路复用器，本站介绍了CY74FCT257T的封装应用图解、特点和优点、功能等，并给出了与CY74FCT257T相关的TI元器件型号供参考。

CY74FCT257T - 具有三态输出的四路 2 选 1 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

The CY74FCT257T has four identical two-input multiplexers that select four bits of data from two sources under the control of a common data-select (S) input. The I0 inputs are selected when S is low, and the I1 inputs are selected when S is high. Data at the output is noninverted.

The CY74FCT257T is a logic implementation of a four-pole, two-position switch, where the position of the switch is determined by the logic levels at S. Outputs are in the high-impedance state when the output-enable (OE\) input is high.

All but one device must be in the high-impedance state to avoid currents exceeding the maximum ratings if outputs are tied together. OE\ inputs must ensure that there is no overlap when outputs of 3-state devices are tied together.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

产品特性

Function, Pinout, and Drive Compatible With FCT and F Logic
Reduced VOH (Typically = 3.3 V) Version of Equivalent FCT Functions
Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
Ioff Supports Partial-Power-Down Mode Operation
Matched Rise and Fall Times
Fully Compatible With TTL Input and Output Logic Levels
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)
64-mA Output Sink Current 32-mA Output Source Current
3-State Outputs

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