SN74ALS245A-1NS

Overview

The SN74ALS245A-1N 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 features a maximum propagation delay of 5.5 ns at 5 V. The device utilizes PNP inputs to reduce DC loading. It is housed in a PDIP-20 package and supports an operating temperature range from 0°C to +70°C. The -1 version specifically increases the recommended maximum low-level output current (IOL) to 48 mA.

Feature Summary

• Provides asynchronous two-way communication between data buses via A and B ports
• Direction control allows data transmission from A to B or B to A based on DIR input logic level
• Output-enable input isolates buses when disabled

Applications

• Asynchronous two-way communication between data buses
• Driving bus lines directly with 3-state outputs
• Minimizing external timing requirements through control-function implementation

Procurement Notes

Verify the specific -1 suffix designation confirms the increased IOL rating of 48 mA, as this differs from the standard SN74ALS245A. Confirm the PDIP-20 package type matches the N suffix. Ensure the operating temperature range aligns with commercial requirements. Check RoHS compliance status for the specific manufacturing lot.

Selection Notes

Select this component when high drive capability is required, specifically needing the 48 mA low-level output current characteristic unique to the -1 version. Compare against standard ALS variants if lower current is sufficient. Consider the AS series for faster switching speeds if propagation delay is a critical constraint.

Part Context

This part belongs to the SN54/74(ALS,AS)245(A) family of octal bus transceivers. It is a catalog version of the military-grade SN54ALS245A. The device shares functional similarities with other bidirectional bus transceivers but is distinguished by its specific ALS logic speed and the enhanced current drive of the -1 variant.

Replacement Considerations

SN74ALS245AN serves as the standard non-enhanced current replacement. SN74ALS245A-1NSR offers the same electrical characteristics in a surface-mount SOP package.