MC74VHCT157A

四路2通道多路复用器 Quad 2−Channel Multiplexer

The is an advanced high speed CMOS quad 2-channel multiplexer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. It consists of four 2-input digital multiplexers with common select S and enable Ebar inputs. When Ebar is held High, selection of data is inhibited and all the outputs go Low. The select decoding determines whether the A or B inputs get routed to the corresponding Y outputs. The VHCT inputs are compatible with TTL levels. This device can be used as a level converter for interfacing 3.3 V to 5.0 V because it has full 5 V CMOS level output swings. The VHCT157A input structures provide protection when voltages between 0 V and 5.5 V are applied, regardless of the supply voltage. The output structures also provide protection when V = 0 V. These input and output structures help prevent device destruction caused by supply voltage input/output voltage mismatch, battery backup, hot insertion, etc. The internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. The inputs tolerate voltages up to 7V, allowing the interface of 5V systems to 3V systems.

Features

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High Speed: tPD = 4.1ns Typ at VCC = 5V

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Low Power Dissipation: ICC = 4mA Max at TA = 25°C

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TTL-Compatible Inputs: VIL = 0.8 V; VIH = 2.0 V

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Power Down Protection Provided on Inputs and Outputs

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Balanced Propagation Delays

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Designed for 2V to 5.5V Operating Range

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Low Noise: VOLP = 0.8V Max

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Pin and Function Compatible with Other Standard Logic Families

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Latchup Performance Exceeds 300mA

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ESD Performance: HBM > 2000V; Machine Model > 200V

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Chip Complexity: 82 FETs or 20 Equivalent Gates

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Pb-Free Packages are Available*