DM74AS244SJX

Overview

The DM74AS244SJX is an Advance Schottky 3-STATE Bus Driver/Receiver manufactured by onsemi (formerly Fairchild Semiconductor). It features eight non-inverting buffers organized with four buffers sharing a common enable gate. The device 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. It utilizes a 20-Lead Small Outline Integrated Circuit (SOIC) package, specifically JEDEC MS-013, 0.300 inch wide. The 'X' suffix indicates availability in Tape and Reel packaging.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for improved switching performance
• Low output impedance capable of driving terminated transmission lines down to 133 Ω
• High input impedance designed to minimize loading on transmission lines
• Functional and pin compatible with standard 74LS and Schottky counterparts

Applications

• Memory systems buffer interface
• Microprocessor system bus drivers
• Communication systems signal buffering

Procurement Notes

Verify the manufacturer origin, as the component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm the specific SOIC-20 package dimensions match the JEDEC MS-013 standard. Ensure the Tape and Reel configuration aligns with automated assembly requirements. Check for RoHS compliance status relative to the manufacturing date.

Selection Notes

Select this component when high-speed unidirectional buffering is required for memory or microprocessor buses. It serves as a direct replacement for legacy 74LS244 designs where lower power dissipation and faster switching are needed. Verify that the 5V logic family compatibility meets the system's voltage levels and that the 3-STATE control inputs function correctly with the host controller.

Part Context

This part belongs to the DM74AS series of Advance Schottky logic devices. The DM74AS244 variant specifically provides eight non-inverting buffers with a single common enable input. It is distinct from the DM74AS240, which offers inverting outputs. Both share the same physical footprint and electrical characteristics regarding drive strength and speed.

Replacement Considerations

SN74AS244ANSR (Texas Instruments)

FAQ

What does the 'X' suffix indicate in the DM74AS244SJX ordering code?

The 'X' suffix specifies that the device is supplied in Tape and Reel packaging rather than tube or tray.

Can this device be used as a bidirectional transceiver?

No, the DM74AS244 is a unidirectional buffer. For bidirectional applications, the DM74AS245 should be used instead.