CD74HC138-Q1

HIGH-SPEED CMOS LOGIC

3- TO 8-LINE INVERTING DECODER/DEMULTIPLEXER

SCLS580A − APRIL 2004 − REVISED APRIL 2008

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Qualified for Automotive Applications

D Select One of Eight Data Outputs Active

Low

D I/O Port or Memory Selector

D Three Enable Inputs to Simplify Cascading

D Typical Propagation Delay of 13 ns at

VCC = 5 V, CL = 15 pF, TA = 255C

D Fanout (Over Temperature Range)

− Standard Outputs ... 10 LSTTL Loads

− Bus Driver Outputs ... 15 LSTTL Loads

D Balanced Propagation Delay and Transition

Times

D Significant Power Reduction Compared to

LSTTL Logic ICs

D 2-V to 6-V V

CC Operation

D High Noise Immunity; N

IL or NIH = 30% of

VCC, VCC = 5 V

description/ordering information

The CD74HC138 is a high-speed silicon-gate CMOS

decoder well suited to memory address decoding or

data routing applications. This circuit features low

power consumption usually associated with CMOS circuitry, yet has speeds comparable to low-power Schottky

TTL logic. The circuit has three binary select inputs (A0, A1, and A2). If the device is enabled, these inputs

determine which one of the eight normally high outputs of the HC138 will go low.

Two active-low and one active-high enables (E1, E2, and E3) are provided to ease the cascading of decoders.

The decoder’s eight outputs can drive ten low-power Schottky TTL equivalent loads.

ORDERING INFORMATION{

TA

PACKAGE‡

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

−40

°C to 125°C

SOIC − M

Reel of 2500

CD74HC138QM96Q1

HC138Q

† For the most current package and ordering information, see the Package Option Addendum at the

end of this document, or see the TI web site at http://www.ti.com.

‡ Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging.

Copyright

 2008, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

M PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A0

A1

A2

E1

E2

E3

Y7

GND

VCC

Y0

Y1

Y2

Y3

Y4

Y5

Y6