Buffers | MC74VHCT257A

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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Pb

A

H

P

TSSOP-16

948F-01

1

260

REEL

2500

N

4

3-State

4.5

5.5

7.9

8

$0.2489

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MC74VHCT257ADG

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Obsolete

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Pb

A

H

P

SOIC-16

751B-05

1

260

TUBE

48

N

4

3-State

4.5

5.5

7.9

8

Price N/A

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MC74VHCT257ADR2G

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Active

CAD Model

Pb

A

H

P

SOIC-16

751B-05

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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Obsolete

CAD Model

Pb

A

H

P

TSSOP-16

948F-01

1

260

TUBE

96

N

4

3-State

4.5

5.5

7.9

8

Price N/A

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Die Related Summary Data

Device: M74VHCT257ADTR2G

Equivalent to wafer fab process: CMOS SUB

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等效器件小时

平均故障间隔时间/平均无故障时间（按小时计算）

FITS

CMOS SUB

2

920154574

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Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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