SN54LS245 Bus Transceivers Datasheet

SN54LS245 Datasheet, PDF, Equivalent


Part Number

SN54LS245

Description

Octal Bus Transceivers

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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SN54LS245
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SN54LS245, SN74LS245
SDLS146B – OCTOBER 1976 – REVISED SEPTEMBER 2016
SNx4LS245 Octal Bus Transceivers With 3-State Outputs
1 Features
1 3-State Outputs Drive Bus Lines Directly
• PNP Inputs Reduce DC Loading on Bus Lines
• Hysteresis at Bus Inputs Improves Noise Margins
• Typical Propagation Delay Times Port to Port,
8 ns
2 Applications
• Building Automation
• Electronic Point of Sale
• Factory Automation and Control
• Test and Measurement
3 Description
These octal bus transceivers are designed for
asynchronous two-way communication between data
buses. The control-function implementation minimizes
external timing requirements.
The SNx4LS245 devices allow data transmission
from the A bus to the B bus or from the B bus to the
A bus, depending on the logic level at the direction-
control (DIR) input. The output-enable (OE) input can
disable the device so that the buses are effectively
isolated.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN54LS245J
CDIP (20)
24.20 mm × 6.92 mm
SN54LS245W
CFP (20)
7.02 mm × 13.72 mm
SN54LS245FK
LCCC (20)
8.89 mm × 8.89 mm
SN74LS245DB
SSOP (20)
7.20 mm × 5.30 mm
SN74LS245DW
SOIC (20)
12.80 mm × 7.50 mm
SN74LS245N
PDIP (20)
24.33 mm × 6.35 mm
SN74LS245NS
SO (20)
12.60 mm × 5.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Logic Diagram (Positive Logic)
1
DIR
19
OE
2
A1
18
B1
To Seven Other Channels
Copyright © 2016, Texas Instruments Incorporated
1
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.
On products compliant to MIL-PRF-38535, all parameters are
tested unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.

SN54LS245
SN54LS245, SN74LS245
SDLS146B – OCTOBER 1976 – REVISED SEPTEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Switching Characteristics .......................................... 5
7.7 Typical Characteristics .............................................. 6
8 Parameter Measurement Information .................. 7
9 Detailed Description .............................................. 8
9.1 Overview ................................................................... 8
9.2 Functional Block Diagram ......................................... 8
9.3 Feature Description................................................... 8
9.4 Device Functional Modes.......................................... 8
10 Application and Implementation........................ 10
10.1 Application Information.......................................... 10
10.2 Typical Application ............................................... 10
11 Power Supply Recommendations ..................... 12
12 Layout................................................................... 12
12.1 Layout Guidelines ................................................. 12
12.2 Layout Example .................................................... 12
13 Device and Documentation Support ................. 13
13.1 Related Links ........................................................ 13
13.2 Receiving Notification of Documentation Updates 13
13.3 Community Resource............................................ 13
13.4 Trademarks ........................................................... 13
13.5 Electrostatic Discharge Caution ............................ 13
13.6 Glossary ................................................................ 13
14 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 A (February 2002) to Revision B
Page
• Added 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 Thermal Information table: 70 to 91.7 for DB package, 58 to 79 for DW package, 69 to 46.1
for N package, and 60 to 74.2 for NS package ...................................................................................................................... 4
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Copyright © 1976–2016, Texas Instruments Incorporated
Product Folder Links: SN54LS245 SN74LS245


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community SN54LS245, SN74LS245 SDLS146 B – OCTOBER 1976 – REVISED SEPTEMBE R 2016 SNx4LS245 Octal Bus Transceivers With 3-State Outputs 1 Features •1 3-State Outputs Drive Bus Lines Directl y • PNP Inputs Reduce DC Loading on B us Lines • Hysteresis at Bus Inputs I mproves Noise Margins • Typical Propa gation Delay Times Port to Port, 8 ns 2 Applications • Building Automation Electronic Point of Sale • Factory Automation and Control • Test and Me asurement 3 Description These octal bu s transceivers are designed for asynchr onous two-way communication between dat a buses. The control-function implement ation minimizes external timing require ments. The SNx4LS245 devices allow data transmission from the A bus to the B b us or from the B bus to the A bus, depe nding on the logic level at the directi oncontrol (DIR) input. The output-enabl e (OE) input can disable the device so that the buses are effectively isolated. De.
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