SN74LS245NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS245NS is an octal bus transceiver utilizing Schottky transistor logic, designed for asynchronous bidirectional communication between data buses. It features three-state outputs that drive bus lines directly and PNP inputs to reduce DC loading. The device includes built-in hysteresis at the bus inputs to improve noise margins. It operates within a supply voltage range of 4.75 V to 5.25 V and supports a typical port-to-port propagation delay of 8 ns. The component is housed in a 20-pin Small Outline (SO) package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Three-state outputs enable direct driving of bus lines while allowing effective isolation when disabled.
• PNP input structure reduces DC loading on connected bus lines.
• Built-in hysteresis at bus inputs enhances noise margin stability.

Buffers, Drivers, Receivers, Transceivers Applications

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

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'NS' corresponds to the 20-pin SO package variant. Confirm RoHS compliance status and lead finish details via the manufacturer's current packaging addendum. Ensure the supply voltage requirements align with the system design before procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring robust bidirectional data transfer with high drive strength. The LS logic family provides sufficient speed for general-purpose asynchronous communication. Consider thermal resistance values if operating near maximum temperature limits or under heavy load conditions.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SNx4LS245 series of octal bus transceivers. It shares common pinouts and functional modes with other variants in the family, such as the SN74LS245N and SN74LS245DW, differing primarily in package type and manufacturing revision history.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS245N

Buffers, Drivers, Receivers, Transceivers FAQ

How does the DIR pin control signal direction?

A low level on the DIR pin allows data transmission from the B bus to the A bus, while a high level enables transmission from the A bus to the B bus.

What is the function of the OE pin?

The Output Enable (OE) pin is active-low. When driven high, it disables all outputs, placing them in a high-impedance state to effectively isolate the buses.