DATA SHEET
SNx4LS245 Octal Bus Transceivers With 3-State Outputs
1 Features
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 |
- For all available packages, see the orderable addendum at the end of the data sheet.
Logic Diagram (Positive Logic)
4 Revision History
Changes from A Revision (February 2002) to B Revision
- 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 sectionGo
- Deleted Ordering Information table; see POA at the end of the data sheet Go
- 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 packageGo
5 Device Comparison Table
| TYPE | IOL
(SINK CURRENT) |
IOH
(SOURCE CURRENT) |
|---|---|---|
| SN54LS245 | 12 mA | –12 mA |
| SN74LS245 | 24 mA | –15 mA |