SN74ALS645AN

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS645AN is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin PDIP package. It provides bidirectional data transmission between two buses (A and B) controlled by a DIR input. The device features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. Standard versions support a low-level output current of 24 mA, while -1 versions increase this to 48 mA under specific conditions. Propagation delay is typically 10 ns.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transfer capability between A and B buses
• Three-state outputs for effective bus isolation
• Direction control via dedicated DIR input pin
• Output enable/disable functionality via OE input

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• High-density digital system interconnects
• Bus driver applications requiring direction control

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the exact ordering suffix against the Package Option Addendum to confirm the physical package type and production status. Ensure the required IOL rating matches the standard or -1 version specifications. Confirm RoHS compliance and lead finish details if surface mount variants are considered instead of the PDIP option.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select the SN74ALS645AN when TTL-compatible inputs and ALS speed are required for octal bus interfacing. Consider the -1 variant if higher low-level sink current is necessary. Verify that the application temperature range aligns with the commercial 0°C to 70°C specification provided for the SN74 series.

Buffers, Drivers, Receivers, Transceivers Part Context

This component belongs to the SN74ALS645A family of octal bus transceivers. It shares functional similarities with other ALS devices like the SN74ALS541 but differs in its bidirectional nature. The 'N' suffix specifically denotes the standard plastic dual-in-line package configuration available for this part number.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS645A-1N is a verified substitute offering increased low-level output current capabilities compared to the standard version.