SN74HC139-Q1

DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER

SCLS598B − NOVEMBER 2004 – REVISED APRIL 2008

1

POST OFFICE BOX 655303

Memory Decoders and Data-Transmission

Systems

CC

Cascading and/or Data Reception

Classification

− 2000-V (H2) Human-Body Model

− 200-V (M3) Machine Model

− 1000-V (C5) Charged-Device Model

description/ordering information

The

SN74HC139

device

is

designed

for

high-performance memory-decoding or data-routing

applications requiring very short propagation delay

times. In high-performance memory systems, this

decoder can minimize the effects of system

decoding.

When

employed

with

high-speed

memories utilizing a fast enable circuit, the delay time

of this decoder and the enable time of the memory

usually are less than the typical access time of the

memory. This means that the effective system delay

introduced by the decoder is negligible.

The SN74HC139 device comprises two individual 2-line to 4-line decoders in a single package. The active-low

enable (G) input can be used as a data line in demultiplexing applications. This decoder/demultiplexer features

fully buffered inputs, each of which represents only one normalized load to its driving circuit.

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

40

°C to 125°C

SOIC − D

Reel of 2500

SN74HC139QDRQ1

HC139Q

−40

°C to 125°C

TSSOP − PW

Reel of 2000

SN74HC139QPWRQ1

HC139Q

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

FUNCTION TABLE

INPUTS

OUTPUTS

G

SELECT

OUTPUTS

G

B

A

Y0

Y1

Y2

Y3

H

X

X

H

H

H

H

L

L

LL

HH

H

L

L

HH

LH

H

L

H

LH

HLH

L

H

H

H

H

H

L

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.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1G

1A

1B

1Y0

1Y1

1Y2

1Y3

GND

2G

2A

2B

2Y0

2Y1

2Y2

2Y3

D OR PW PACKAGE

(TOP VIEW)

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.