Texas Instruments SN74HC138D Bedienungsanleitung

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SNx4HC138 3-Line To 8-Line Decoders/Demultiplexers

1 Features

• Targeted Specifically for High-Speed Memory

Decoders and Data-Transmission Systems

• Wide Operating Voltage Range (2 V to 6 V)

• Outputs Can Drive Up To 10 LSTTL Loads

• Low Power Consumption, 80-µA Maximum ICC

• Typical tpd = 15 ns

• ±4-mA Output Drive at 5 V

• Low Input Current of 1-µA Maximum

• Active Low Outputs ( Selected Output is Low)

• Incorporate Three Enable Inputs to Simplify

Cascading or Data Reception

2 Applications

• LED Displays

• Servers

• White Goods

• Power Infrastructure

• Building Automation

• Factory Automation

3 Description

The SNx4HC138 devices 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 employed with high-speed

memories using a fast enable circuit, the delay times

of these decoders and the enable time of the memory

are usually less than the typical access time of the

memory. This means that the effective system delay

introduced by the decoders is negligible.

Device Information

PART NUMBER PACKAGE(1) BODY SIZE (NOM)

SN74HC138D SOIC (16) 9.90 mm x 3.90 mm

SN74HC138DB SSOP (16) 6.20 mm x 5.30 mm

SN74HC138N PDIP (16) 19.32 mm x 6.35 mm

SN74HC138NS SO (16) 10.20 mm x 5.30 mm

SN74HC138PW TSSOP (16) 5.00 mm x 4.40 mm

SN54HC138J CDIP (16) 21.34 mm x 6.92 mm

SN54HC138W CFP (16) 10.16 mm x 6.73 mm

SN54HC138FK LCCC (20) 8.89 mm x 8.89 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.

Functional Block DIagram

SN54HC138, SN74HC138

SCLS107G – DECEMBER 1982 – REVISED OCTOBER 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Table of Contents

1 Features............................................................................1

2 Applications..................................................................... 1

3 Description.......................................................................1

4 Revision History.............................................................. 2

5 Pin Configuration and Functions...................................3

Pin Functions.................................................................... 3

6 Specifications.................................................................. 4

6.1 Absolute Maximum Ratings........................................ 4

6.2 ESD Ratings: SN74HC138......................................... 4

6.3 Recommended Operating Conditions.........................4

6.4 Thermal Information: SN74HC138..............................5

6.5 Thermal Information: SN54HC138..............................5

6.6 Electrical Characteristics.............................................5

6.7 Electrical Characteristics: SN74HC138...................... 6

6.8 Electrical Characteristics: SN54HC138...................... 6

6.9 Switching Characteristics............................................6

6.10 Switching Characteristics: SN74HC138....................7

6.11 Switching Characteristics: SN54HC138....................7

6.12 Typical Characteristic................................................7

7 Parameter Measurement Information............................ 8

8 Detailed Description........................................................9

8.1 Overview.....................................................................9

8.2 Functional Block Diagram........................................... 9

8.3 Feature Description.....................................................9

8.4 Device Functional Modes..........................................10

9 Application and Implementation.................................. 11

9.1 Application Information..............................................11

9.2 Typical Application.................................................... 11

10 Power Supply Recommendations..............................12

11 Layout........................................................................... 12

11.1 Layout Guidelines................................................... 12

11.2 Layout Example...................................................... 12

12 Device and Documentation Support..........................13

12.1 Documentation Support.......................................... 13

12.2 Related Links.......................................................... 13

12.3 Receiving Notification of Documentation Updates..13

12.4 Support Resources................................................. 13

12.5 Trademarks............................................................. 13

12.6 Electrostatic Discharge Caution..............................13

12.7 Glossary..................................................................13

13 Mechanical, Packaging, and Orderable

Information.................................................................... 13

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (September 2003) to Revision F (September 2016) Page

• Added table, section, , ESD Ratings Feature Description Device Functional Modes Application and

Implementation Power Supply Recommendations Layout Device and section, section, section,

Documentation Support Mechanical, Packaging, and Orderable Information section, and section................... 1

• Deleted Ordering Information table; see POA at the end of the data sheet....................................................... 1

• Changed RθJA values from 73 to 87.3 (D), from 82 to 104.3 (DB), from 67 to 54.8 (N), from 64 to 91.1 (NS),

and from 108 to 114.6 (PW)................................................................................................................................5

Changes from Revision F (September 2016) to Revision G (October 2021) Page

• Updated the ESD ratings table to fit modern data sheet standards....................................................................4

SN54HC138, SN74HC138

SCLS107G – DECEMBER 1982 – REVISED OCTOBER 2021 www.ti.com