2

SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244

SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244

SDLS144D – APRIL 1985 – REVISED OCTOBER 2016

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Product Folder Links: SN54LS240 SN54LS241 SN54LS244 SN54S240 SN54S241 SN54S244 SN74LS240

SN74LS241 SN74LS244 SN74S240 SN74S241 SN74S244

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Copyright © 1985–2016, Texas Instruments Incorporated

Table of Contents

1

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

2

Applications ........................................................... 1

3

Description ............................................................. 1

4

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

5

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

6

Specifications......................................................... 4

6.1

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

6.2

ESD Ratings.............................................................. 4

6.3

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

6.4

Thermal Information ................................................. 5

6.5

Electrical Characteristics – SNx4LS24x.................... 5

6.6

Electrical Characteristics – SNx4S24x...................... 5

6.7

Switching Characteristics – SNx4LS24x................... 6

6.8

Switching Characteristics – SNx4S24x..................... 6

6.9

Typical Characteristics .............................................. 7

7

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

7.1

SN54LS24x and SN74LS24x Devices...................... 7

7.2

SN54S24x and SN74S24x Devices.......................... 9

8

Detailed Description ............................................ 11

8.1

Overview ................................................................. 11

8.2

Functional Block Diagrams ..................................... 11

8.3

Feature Description................................................. 12

8.4

Device Functional Modes........................................ 12

9

Application and Implementation ........................ 14

9.1

Application Information............................................ 14

9.2

Typical Application .................................................. 14

9.3

System Examples ................................................... 15

10

Power Supply Recommendations ..................... 17

11

Layout................................................................... 17

11.1

Layout Guidelines ................................................. 17

11.2

Layout Example .................................................... 17

12

Device and Documentation Support ................. 18

12.1

Related Links ........................................................ 18

12.2

Receiving Notification of Documentation Updates 18

12.3

Community Resource............................................ 18

12.4

Trademarks ........................................................... 18

12.5

Electrostatic Discharge Caution ............................ 18

12.6

Glossary ................................................................ 18

13

Mechanical, Packaging, and Orderable

Information ........................................................... 19

4 Revision History

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

Changes from Revision C (May 2010) to Revision D

Page

•

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

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

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

•

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

•

Changed RθJA values in the Thermal Information table from 70 to 94.3 (DB), from 58 to 90.3 (DW), from 69 to 50.6

(N), and from 60 to 76.6 (NS)................................................................................................................................................. 5