SN74LS645N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS645N is an octal bus transceiver from the Texas Instruments SN74LS series, housed in a 20-pin PDIP package. It features three-state outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device supports TTL input levels and provides TTL output levels. Key electrical characteristics include a maximum propagation delay of 30 ns, a low-level output current of 48 mA, and a high-level output current of -15 mA. It is designed for operation at temperatures between 0°C and +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional data transfer capability with direction control
• Three-state outputs allowing direct system bus interconnection
• TTL-compatible inputs and outputs for standard logic interfacing

Buffers, Drivers, Receivers, Transceivers Applications

• Memory and memory mapping
• Instrumentation
• Control loops

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's Package Option Addendum to confirm the exact package type, lead finish, and moisture sensitivity rating. Ensure the selected variant matches the required operating temperature range and RoHS compliance status for your application environment.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal bus transceiver with three-state outputs and TTL compatibility is required. Consider the SN74LS645-1N if inverted outputs are needed instead of non-inverted ones. Evaluate power consumption and drive strength requirements relative to other LS family devices before finalizing the design.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS64x family of octal bus transceivers published by Texas Instruments. It shares functional similarities with the SN74LS640 through SN74LS642 variants but differs in output configuration and polarity. The SN74LS645 specifically provides non-inverting data transmission with three-state outputs.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS645-1N (inverted outputs)

Buffers, Drivers, Receivers, Transceivers FAQ

What is the difference between SN74LS645 and SN74LS645-1?

The SN74LS645 provides non-inverting data transmission, while the SN74LS645-1 provides inverted data transmission. Both share the same octal bus transceiver architecture and three-state outputs.

Does the SN74LS645 support bidirectional data flow?

Yes, the device is designed as a bidirectional bus transceiver, allowing data to flow in either direction depending on the state of the direction control input.