SN74ALS645ADW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS645ADW is an octal bus transceiver from the Texas Instruments SN74ALS series, housed in a 20-pin Small-Outline (DW) package. It features 3-state outputs and operates on a supply voltage of 4.5 V to 5.5 V. The device supports asynchronous two-way communication between data buses with propagation delays ranging from 1 ns to 19 ns depending on direction and control inputs. It is characterized for operation within a temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between A and B buses controlled by DIR input
• Three-state outputs allowing effective bus isolation when OE is high
• Compatible with TTL input levels

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and logic implementations
• Clock drivers and bus transceivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm active production status and RoHS compliance. Ensure the selected variant matches the required operating temperature range and packaging format for your design constraints.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring octal bidirectional data transfer with low power dissipation characteristics typical of the ALS logic family. Consider the -1 version if higher output current capability is necessary, noting that standard versions have different IOL specifications.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS645A family of octal bus transceivers. It shares functional similarities with other devices in the 74ALS series but is distinct from the SN74AS645 which offers faster switching speeds and higher drive currents. The DW package provides a surface-mount alternative to the through-hole PDIP option.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS645AN serves as a direct pin-compatible alternative in a PDIP package.