CD74HC257

CD74HC257概述

具有同向三态输出的高速 CMOS 逻辑四路 2 输入多路复用器

The ’HC257 and ’HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input S. The Output Enable input OE\\ is active LOW. When OE\ is HIGH, all of the outputs 1Y-4Y are in the high impedance state regardless of all other input conditions.

Moving data from two groups of registers to four common output buses is a common use of the 257. The state of the Select input determines the particular register from which the data comes. It can also be used as a function generator.

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Buffered Inputs
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Typical Propagation Delay In to Output = 12ns at VCC = 5V, CL = 15pF, TA = 25°C
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Fanout Over Temperature Range
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Standard Outputs...10 LSTTL Loads
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Bus Driver Outputs...15 LSTTL Loads
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Wide Operating Temperature Range...–55°C to 125°C
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Balanced Propagation Delay and Transition Times
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Significant Power Reduction Compared to LSTTL Logic ICs
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HC Types
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2V to 6V Operation
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High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
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HCT Types
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4.5V to 5.5V Operation
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Direct LSTTL Input Logic Compatibility, VIL = 0.8V Max, VIH = 2V Min
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CMOS Input Compatibility, Il 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor

CD74HC257数据文档
型号 品牌 下载
CD74HC257

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CD74ACT541M96

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CD74HC125M

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CD74AC541M

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CD74AC541M96

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CD74HC125M96

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CD74ACT05M

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CD74ACT244M

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CD74HC244E

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CD74HC244M

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CD74HC541E

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