SN74LS245DBR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS245DBR is an octal bus transceiver from the Texas Instruments SNx4LS245 family, designed for asynchronous bidirectional communication between data buses. It operates within a supply voltage range of 4.75 V to 5.25 V and features Schottky transistor logic. The device provides three-state outputs capable of driving bus lines directly, with PNP inputs that reduce DC loading on bus lines. Built-in hysteresis at the bus inputs improves noise margins. Data transmission direction is controlled by the DIR input, while the OE input disables the device to isolate buses. It is housed in a 20-pin SSOP package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Three-state outputs drive bus lines directly and can be disabled via the OE pin to effectively isolate buses.
• PNP inputs reduce DC loading on connected bus lines.
• Built-in hysteresis at bus inputs improves noise margins.

Buffers, Drivers, Receivers, Transceivers Applications

• Building automation
• Electronic point of sale systems
• Factory automation and control
• Test and measurement equipment

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP-20 package and tape-and-reel carrier format as defined in the TI Package Option Addendum. Confirm RoHS compliance status and lead finish specifications (NIPDAU) match project requirements. Ensure the operating temperature range of 0°C to 70°C aligns with the intended environmental conditions. Cross-reference the manufacturer part number against current production status to confirm availability.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal, non-inverting bus transceiver with three-state outputs is required for asynchronous data communication. It is suitable for applications needing high drive strength to overcome signal losses in ribbon cables or backplanes. Consider the LS logic family characteristics, including typical propagation delays and power consumption, relative to system timing constraints. Verify that the 20-pin SSOP package dimensions fit the available PCB footprint.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SNx4LS245 family of octal bus transceivers utilizing Schottky transistor logic. It shares common pinouts and functional definitions with other variants such as SN74LS245DW and SN74LS245N, differing primarily in packaging and thermal characteristics. The standard '245 logic function includes a direction select pin and active-low output enable, ensuring compatibility with existing designs using similar transceiver architectures.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS245DWR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74LS245DBR handle unused channels?

Unused channels must be terminated properly to prevent floating inputs. Both sides of the unused channel should be tied to the same logic level, typically ground or VCC, to ensure stable operation.

What is the function of the DIR pin?

The DIR pin controls the direction of data transmission. A low level allows data transfer from the B bus to the A bus, while a high level allows transfer from the A bus to the B bus.