SN74ALS1244ADWR

Overview

The SN74ALS1244ADWR is an octal buffer and line driver with three-state outputs belonging to the Texas Instruments ALS logic family. It operates on a single supply voltage ranging from 4.5 V to 5.5 V, with a nominal value of 5 V. The device features non-inverting logic and provides two independent four-bit channels controlled by separate output enable inputs (1OE and 2OE). It utilizes a 20-pin Small-Outline (DW) package for surface-mount installation. Designed for low-power applications, it incorporates PNP input structures to reduce DC loading on driving circuits.

Feature Summary

• Features PNP input structures that significantly reduce DC loading on upstream drivers compared to standard TTL or ALS inputs.
• Provides high-drive capability suitable for directly driving bus lines and memory address registers without additional buffering stages.
• Includes dual independent output enable controls allowing flexible management of data flow direction and bus arbitration.

Applications

• Driving memory address registers in computer systems
• Buffering clock signals for synchronous digital circuits
• Acting as receivers and transmitters in bus-oriented architectures

Procurement Notes

Verify the specific ordering suffix to confirm the package type and reel specifications. Confirm RoHS compliance status and lead finish details against the latest manufacturer documentation before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring low-power consumption alongside high drive strength for bus applications. Ensure the operating environment remains within the commercial temperature range of 0°C to 70°C. Verify that the required propagation delay characteristics align with the system timing constraints.

Part Context

This device belongs to the SNx4ALS124xA series, which serves as the low-power variant of the classic ALS244 octal buffer family. It complements the SN74ALS1240 to provide both non-inverting and inverting options within the same logic family, maintaining pinout compatibility while offering improved power-performance ratios.

Replacement Considerations

Direct functional replacements include the SN74ALS244ADWR for non-inverting applications and the SN74ALS1240ADWR for inverting configurations. Cross-family alternatives such as the SN74ACT244DWR offer similar functionality with CMOS technology but require different voltage level considerations.