SN74ALS645A-1N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS645A-1N is an octal bus transceiver with 3-state outputs in a 20-pin PDIP package. It facilitates asynchronous two-way communication between data buses, transmitting data from the A bus to the B bus or vice versa based on the DIR input level. The OE input isolates the buses when disabled. This -1 version features an increased recommended maximum IOL of 48 mA (at VCC between 4.75 V and 5.25 V). Operating voltage ranges from 4.5 V to 5.5 V, with propagation delays up to 10 ns.

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 via OE input
• -1 version supports increased low-level output current capability

Buffers, Drivers, Receivers, Transceivers Applications

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

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific -1 suffix designation confirms the enhanced low-level output current specification of 48 mA under appropriate supply conditions. Confirm the PDIP-20 package type matches the required through-hole mounting constraints. Ensure the operating temperature range aligns with the commercial 0°C to 70°C specification for this catalog part number.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring high-density octal bus interfacing with TTL-compatible inputs and outputs. The ALS series offers faster switching speeds compared to standard LS logic. Consider the -1 variant if higher drive current is necessary for the specific load conditions within the allowed voltage window.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74ALS645A family of octal bus transceivers. It shares functional similarities with the standard SN74ALS645A but distinguishes itself through the -1 suffix, which modifies the electrical characteristics regarding output current capabilities while maintaining the same pinout and logical operations.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS645AN serves as the standard non-enhanced current alternative within the same package.