SN74AS645N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS645N is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports bidirectional data transmission between two buses based on the DIR input level. The device features TTL-compatible inputs and CMOS outputs, packaged in a standard plastic 20-pin DIP (PDIP). It is characterized for operation over a temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transfer capability controlled by a direction input
• Three-state outputs allowing effective bus isolation when disabled
• TTL-compatible input levels ensuring compatibility with standard logic families

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous communication between data buses
• High-density digital systems requiring octal bus interfacing
• Memory interface circuits utilizing bidirectional data paths

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific part number matches the required AS logic series and PDIP package configuration. Confirm the operating temperature range aligns with system requirements, as this variant is rated for commercial temperatures. Ensure the datasheet version corresponds to the production batch specifications for accurate electrical characteristics.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed bidirectional data transfer is required with TTL input compatibility. The AS series offers faster switching speeds compared to standard LS or ALS counterparts. Consider the 20-pin DIP package constraints for through-hole mounting applications where space allows.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74AS family of advanced Schottky logic devices. It shares functional similarities with the SN74ALS645A but provides higher speed performance. The SN74AS645N is a catalog product designed for general-purpose digital applications requiring robust bus driving capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS645AN is a compatible alternative within the same family offering similar functionality with slightly different electrical characteristics.