CY74FCT2257T - 具有三态输出和串联阻尼电阻的四路 2 选 1 数据选择器/多路复用器

CY74FCT2257T是TI德州仪器公司的一款解码器/编码器/多路复用器产品，CY74FCT2257T是具有三态输出和串联阻尼电阻的四路 2 选 1 数据选择器/多路复用器，本站介绍了CY74FCT2257T的封装应用图解、特点和优点、功能等，并给出了与CY74FCT2257T相关的TI元器件型号供参考。

CY74FCT2257T - 具有三态输出和串联阻尼电阻的四路 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 CY74FCT2257T 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 appears at the output in noninverted form for the CY74FCT2257T. On-chip termination resistors at the outputs reduce system noise caused by reflections. The CY74FCT2257T can replace the FCT257T to reduce noise in an existing design.

The CY74FCT2257T is a logic implementation of a four-pole, two-position switch, in which the position of the switch is determined by the logic levels supplied to S. Outputs are forced to the high-impedance off state when the output-enable (OE\) input is high.

All but one device must be in the high-impedance state to prevent currents from exceeding the maximum ratings if outputs are tied together. Design of the OE\ signals 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 and Pinout Compatible With FCT and F Logic
25- Output Series Resistors to Reduce Transmission-Line Reflection Noise
TTL Output Level Versions of Equivalent FCT Functions
Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
Ioff Supports Partial-Power-Down Mode Operation
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)
12-mA Output Sink Current 15-mA Output Source Current
3-State Outputs

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