DM74ALS244AN

Overview

The DM74ALS244AN is an octal 3-STATE bus driver manufactured by onsemi (formerly Fairchild Semiconductor). It features two groups of four buffers with separate control inputs that enable outputs when set logic LOW. The device utilizes an advanced low power oxide-isolated ion-implanted Schottky TTL process, offering improved switching performance and reduced power dissipation compared to the 74LS counterpart. It operates within a supply voltage range of 4.5V to 5.5V and supports a propagation delay of up to 10ns at 5V with a 50pF load.

Feature Summary

• Provides flexible bus interface implementation for memory, microprocessor, or communication systems
• Maintains buffer outputs in high impedance state during power supply ramp-up or ramp-down to eliminate bus glitching
• Features PNP input design to reduce input loading

Applications

• Memory bus interfaces
• Microprocessor system interconnects
• Communication system data routing

Procurement Notes

Verify the specific package type and manufacturer origin, as this component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm availability status as legacy products may be discontinued or available only through third-party distributors. Ensure compliance with RoHS and REACH regulations if required for the target application environment.

Selection Notes

Select this component when an octal bus driver with 3-STATE output capability is required for system interfacing. It serves as a functional and pin-compatible replacement for the 74LS244 while providing superior switching speed and lower power consumption. Consider the 20-pin DIP package for through-hole mounting requirements and verify temperature grade suitability for the operating environment.

Part Context

This part belongs to the 74ALS series of logic integrated circuits, which are designed for high-speed applications requiring low power consumption. The DM74ALS244A variant specifically provides octal buffering capabilities. The 'N' suffix denotes the 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001 standard, suitable for general-purpose circuit board integration.

Replacement Considerations

Direct substitutes include other 74ALS244 variants from different manufacturers such as Texas Instruments SN74ALS244. Verify pin compatibility and electrical characteristics match the original design requirements before substitution.