DM74ALS244ASJ

Overview

The DM74ALS244ASJ is an octal 3-STATE bus driver manufactured by onsemi (Fairchild) in a 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature of 0°C to +70°C. Key electrical parameters include propagation delays of 3ns to 10ns, output drive currents of -15mA (high) and 24mA (low), and input/output configurations organized into two groups of four buffers with independent gating controls.

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 buses
• Communication system data lines

Procurement Notes

Verify the specific package designation 'ASJ' corresponds to the 20-Lead SOP (EIAJ TYPE II) as listed in the ordering code table. Confirm that the required operating temperature range aligns with the standard 0°C to +70°C specification, noting that extended temperature grades are available under different suffixes. Ensure compatibility with existing board layouts requiring this specific footprint.

Selection Notes

Select this component when an octal bus driver with 3-STATE capability is required for system interfacing. It offers improved switching performance and lower power dissipation compared to 74LS counterparts while maintaining functional and pin compatibility. Consider the specific SOP package dimensions if space constraints exist relative to SOIC or SSOP alternatives.

Part Context

This device belongs to the Advanced Low-power Schottky (ALS) logic family, designed to balance speed and power consumption. The DM74ALS244A series provides octal buffering with separate control inputs for two groups of four buffers each. The ASJ suffix specifically identifies the 20-Lead Small Outline Package variant distinct from SOIC, SSOP, or PDIP options.

Replacement Considerations

Direct substitutes include other 74ALS244 variants in different packages such as DM74ALS244AWM (SOIC) or DM74ALS244AMSA (SSOP). Functional equivalents from other manufacturers following the 74ALS244 standard may also be considered if pinout and electrical characteristics match.