© Semiconductor Components Industries, LLC, 2006

January, 2006 − Rev. 3

1

Publication Order Number:

MC74VHCT138A/D

MC74VHCT138A

3−to−8 Line Decoder

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 E2 or E1 is held High, decoding

function is inhibited and all outputs go high. E3, E2, and E1 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 3.3 V to 5.0 V, because they

have full 5.0 V CMOS level output swings.

The VHCT138A input structures provide protection when voltages

between 0 V and 5.5 V are applied, regardless of the supply voltage.

input and output structures help prevent device destruction caused by

supply voltage − input/output voltage mismatch, battery backup, hot

insertion, etc.

Features

Human Body Model > 2000 V;

Machine Model > 200 V

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

MARKING

DIAGRAMS

TSSOP−16

DT SUFFIX

CASE 948F

SOIC−16

D SUFFIX

CASE 751B

See detailed ordering and shipping information in the package

dimensions section on page 5 of this data sheet.

ORDERING INFORMATION

http://onsemi.com

A

= Assembly Location

WL, L

= Wafer Lot

Y

= Year

WW, W

= Work Week

G or

G

= Pb−Free Package

VHCT138AG

AWLYWW

VHCT

138A

ALYW

G

G

(Note: Microdot may be in either location)

PIN ASSIGNMENT

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

A0

E1

A2

A1

Y7

E3

E2

GND

Y3

Y2

Y1

Y0

Y5

Y4

Y6

1

1

16

1

1

16