DM74AS244WMX

Overview

The DM74AS244WMX is an octal 3-STATE bus driver manufactured by onsemi, housed in a 20-lead Small Outline Integrated Circuit (SOIC) package. It operates within a supply voltage range of 4.5V to 5.5V and supports a free air operating temperature from 0°C to +70°C. The device features low output impedance capable of driving terminated transmission lines down to 133Ω. Propagation delays are specified between 2ns and 6.5ns depending on the transition direction.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for improved switching performance
• Functional and pin compatible with standard 74LS and Schottky counterparts
• Designed to interface directly with CMOS logic at VOH = VCC − 2V
• Switching response specified into 500Ω resistance and 50 pF load capacitance

Applications

• Memory systems requiring unidirectional buffering
• Microprocessor system data buses
• Communication systems utilizing terminated transmission lines

Procurement Notes

Verify that the ordering code includes the 'X' suffix to confirm the tape and reel packaging format. Confirm the manufacturer designation as Fairchild Semiconductor or its successor entity, onsemi, to ensure component authenticity. Check the datasheet revision date against manufacturing records to validate technical specifications.

Selection Notes

Select this component when a high-speed, unidirectional buffer is required for memory or microprocessor interfaces. The device provides low output impedance suitable for driving terminated transmission lines. Ensure the application requires non-inverting logic outputs and operates within the specified 4.5V to 5.5V supply voltage range.

Part Context

This part belongs to the DM74AS240/DM74AS244 family of Advance Schottky 3-STATE Bus circuits. While the DM74AS240 offers inverting outputs, the DM74AS244 provides non-inverting functionality. Both devices share identical physical dimensions and electrical characteristics, differing only in their logical inversion state.

Replacement Considerations

SN74AS244D

FAQ

What is the maximum propagation delay for the DM74AS244?

The maximum propagation delay is 6.5ns for LOW-to-HIGH transitions and 6.2ns for HIGH-to-LOW transitions.

Can this device drive terminated transmission lines?

Yes, the output characteristics have low impedance sufficient to drive terminated transmission lines down to 133Ω.