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Multiplexers | MC74VHCT138A

3-to-8 Line Decoder

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Overview

The MC74VHCT138A is an advanced high speed CMOS 3-to-8 decoder fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation.

When the device is enabled, three Binary Select inputs (A0 - A2) determine which one of the outputs (Y0 - Y7) will go Low. When enable input E3 is held Low or either E2bar or E1bar is held High, decoding function is inhibited and all outputs go high. E3, E2bar, and E1bar inputs are provided to ease cascade connection and for use as an address decoder for memory systems.

The VHCT inputs are compatible with TTL levels. This device can be used as a level converter for interfacing 3.3V to 5.0V, because they have full 5V CMOS level output swings.

The VHCT138A input structures provide protection when voltages between 0V and 5.5V are applied, regardless of the supply voltage. The output structures also provide protection when VCC = 0V. These input and output structures help prevent device destruction caused by supply voltage - input/output voltage mismatch, battery backup, hot insertion, etc.

  • High Speed: tPD = 7.6ns (Typ) at VCC = 5V
  • Low Power Dissipation: ICC = 4mA (Max) at TA = 25°C
  • TTL-Compatible Inputs: VIL = 0.8V; VIH = 2.0V
  • Power Down Protection Provided on Inputs and Outputs
  • Balanced Propagation Delays
  • Designed for 4.5V to 5.5V Operating Range
  • Pin and Function Compatible with Other Standard Logic Families
  • Latchup Performance Exceeds 300mA
  • ESD Performance: HBM > 2000V; Machine Model > 200V
  • Chip Complexity: 122 FETs or 30.5 Equivalent Gates
  • Pb-Free Packages are Available*

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MC74VHCT138ADR2G

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CAD Model

Pb

A

H

P

SOIC-16

751B-05

1

260

REEL

2500

N

1

3

5.5

11.4

8

$0.2723

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MC74VHCT138ADTRG

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Active

CAD Model

Pb

A

H

P

TSSOP-16

948F-01

1

260

REEL

2500

N

1

3

5.5

11.4

8

$0.242

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Reliability Data

Die Related Summary Data

Device: MC74VHCT138ADR2G

Equivalent to wafer fab process: CMOS SUB

Product Technology

Product Technology

Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

CMOS SUB

2

920154574

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Re-calculate Data

Data is based on the following assumptions.

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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