DM74S139N Fairchild Semiconductor, DM74S139N Datasheet

DM74S139N

Manufacturer Part Number

DM74S139N

Description

IC DECODER/DEMUX 2-4LINE 16-DIP

Manufacturer

Fairchild Semiconductor

Series

74Sr

Type

Decoder/Demultiplexerr

Datasheet

1.DM74S138N.pdf (5 pages)

Specifications of DM74S139N

Circuit

1 x 2:4

Independent Circuits

Current - Output High, Low

1mA, 20mA

Voltage Supply Source

Single Supply

Voltage - Supply

4.75 V ~ 5.25 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Through Hole

Package / Case

16-DIP (0.300", 7.62mm)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

74S139
74S139N

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

DM74S139N

Manufacturer:

TEXAS

Quantity:

1 575

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DM74S138N

DM74S139N

DM74S138 • DM74S139

Decoder/Demultiplexer

General Description

These Schottky-clamped circuits are designed to be used

in high-performance memory-decoding or data-routing

applications, requiring very short propagation delay times.

In high-performance memory systems these decoders can

be used to minimize the effects of system decoding. When

used with high-speed memories, the delay times of these

decoders are usually less than the typical access time of

the memory. This means that the effective system delay

introduced by the decoder is negligible.

The DM74S138 decodes one-of-eight lines, based upon

the conditions at the three binary select inputs and the

three enable inputs. Two active-LOW and one active-HIGH

enable inputs reduce the need for external gates or invert-

ers when expanding. A 24-line decoder can be imple-

mented with no external inverters, and a 32-line decoder

requires only one inverter. An enable input can be used as

a data input for demultiplexing applications.

The DM74S139 comprises two separate two-line-to-four-

line decoders in a single package. The active-LOW enable

input can be used as a data line in demultiplexing applica-

tions.

All of these decoders/demultiplexers feature fully buffered

inputs, presenting only one normalized load to its driving

circuit. All inputs are clamped with high-performance

Schottky diodes to suppress line-ringing and simplify sys-

tem design.

Ordering Code:

Order Number

Package Number

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

DS006466

Features

Designed specifically for high speed:

DM74S138 3-to-8-line decoders incorporates 3 enable

inputs to simplify cascading and/or data reception

DM74S139 contains two fully independent 2-to-4-line

decoders/demultiplexers

Schottky clamped for high performance

Typical propagation delay time (3 levels of logic)

Typical power dissipation

Memory decoders

Data transmission systems

DM74S138 8 ns

DM74S139 7.5 ns

DM74S138 245 mW

DM74S139 300 mW

Package Description

August 1986

Revised April 2000

www.fairchildsemi.com

Related parts for DM74S139N

DM74S139N Summary of contents

Page 1

... Ordering Code: Order Number Package Number DM74S138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74S139N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide © 2000 Fairchild Semiconductor Corporation Features Designed specifically for high speed: Memory decoders ...

Page 2

Connection Diagrams DM74S138 Function Tables DM74S138 Inputs Outputs Enable Select G1 G2 ...

Page 3

Absolute Maximum Ratings Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Recommended Operating Conditions Symbol Parameter V Supply Voltage CC V HIGH Level Input Voltage IH V LOW Level Input Voltage IL I HIGH Level Output ...

Page 4

DM74S138 Switching Characteristics and Symbol Parameter From (Input) To (Output) t Propagation Delay Time PLH Select to Output LOW-to-HIGH Level Output t Propagation Delay Time PHL Select to Output HIGH-to-LOW Level Output ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at ...

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