DM74ALS244AMSAX

Overview

The DM74ALS244AMSAX is an octal 3-STATE bus driver manufactured by onsemi, utilizing the Advanced Low-power Schottky (ALS) process. It features two groups of four buffers with separate control inputs that enable outputs when set logic LOW. The device includes a feature to maintain high impedance during power supply ramp-up or ramp-down, eliminating bus glitching. It operates within a supply voltage range of 4.5V to 5.5V and supports propagation delays as low as 3ns. The component is housed in a 20-Lead Shrink Small Outline Package (SSOP).

Feature Summary

• Octal 3-STATE bus driver architecture with dual independent buffer groups.
• High-impedance state maintained during power supply transitions to prevent bus glitches.
• Advanced low-power oxide-isolated ion-implanted Schottky TTL process for improved switching performance.
• Functionally and pin-compatible with standard 74LS counterparts.

Applications

• Bus interface implementation between memory and microprocessor systems.
• Communication system data routing and buffering.
• General-purpose octal bus driving applications requiring 3-STATE control.

Procurement Notes

Verify the specific suffix 'X' indicates tape and reel packaging configuration. Confirm the manufacturer origin, as onsemi acquired Fairchild Semiconductor assets; datasheets may retain original branding. Ensure the order matches the SSOP package variant required for the design. Check current product status as legacy components may have limited availability.

Selection Notes

Select this component for designs requiring high-density octal buffering with low power consumption. The ALS technology offers faster switching speeds compared to standard LS logic while maintaining lower power dissipation. Verify that the 4.5V to 5.5V operating voltage aligns with the system's power supply rails. Consider the 20-lead SSOP footprint constraints during PCB layout planning.

Part Context

This part belongs to the 74ALS series of logic integrated circuits, known for balancing speed and power efficiency. The DM74ALS244A specifically serves as an octal buffer/driver. The 'M' in the part number denotes the SSOP package type, while the 'SA' typically refers to the shrink outline package dimensions. The 'X' suffix specifies the reel-based packaging format for automated assembly.

Replacement Considerations

Direct substitutes include SN74ALS244CDBR from Texas Instruments. Verify pinout compatibility and electrical characteristics against the original datasheet specifications before substitution.