四路 2 沟道多路复用器 (Mux),带 3 态输出

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MC74VHCT257A 是一款先进的高速 CMOS 四路 2 沟道多路复用器,采用硅门极 CMOS 工艺制造。它能实现与同等双极肖特基 TTL 相似的高速运行,同时还保持 CMOS 低功耗。它由四个 2 输入数字多路复用器组成,带公用选择 (S) 和启用 (OE)bar 输入。当 (OE)bar 保持高电平状态时,禁止选择数据,所有输出转为低电平。选择解码决定了 A 或 B 输入是否路由到相应的 Y 输出。VHCT 输入与 TTL 电平兼容。此器件可用作电平转换器,用于连接 3.3 V 至 5.0 V 电路,因为它具有全 5V CMOS 电平输出摆幅。VHCT257A 输入结构在应用 0 - 5.5 V 的电压时提供保护,而无论电源电压如何。输出结构还会在 VCC = 0V 时提供保护。这些输入和输出结构有助于防止电源电压 - 输入/输出电压不匹配、电池备用、热插入等导致的器件损坏。该内部电路由三级组成,包括一个提供高抗扰性和稳定输出的缓冲器输出。输入耐压达 7 V,支持 5 V 系统到 3 V 系统的接口。

  • High Speed: tPD = 4.1ns (Typ) at VCC = 5V
  • Low Power Dissipation: ICC = 4mA (Max) at TA = 25°C
  • TTL-Compatible Inputs: VIL = 0.8 V; VIH = 2.0 V
  • Power Down Protection Provided on Inputs and Outputs
  • Balanced Propagation Delays
  • Designed for 2V to 5.5V Operating Range
  • Low Noise: VOLP = 0.8V (Max)
  • Pin and Function Compatible with Other Standard Logic Families
  • Latchup Performance Exceeds 300mA
  • ESD Performance: HBM > 2000V; Machine Model > 200V
  • Pb-Free Packages are Available

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M74VHCT257ADTR2G

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H

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TSSOP-16

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260

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2500

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4

3-State

4.5

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7.9

8

$0.2489

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MC74VHCT257ADG

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SOIC-16

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260

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48

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8

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MC74VHCT257ADR2G

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Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

4

3-State

4.5

5.5

7.9

8

$0.2792

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MC74VHCT257ADTG

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Pb

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H

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TSSOP-16

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260

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96

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7.9

8

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