DM74AS646WM

Overview

The DM74AS646WM is an octal registered bus transceiver belonging to the AS (Advance Schottky) logic series. It features eight D-type registers with tri-state outputs and supports bidirectional data transfer between two buses. The device utilizes a 24-pin Small Outline (SOIC) plastic package. It operates within a standard voltage range and includes direction control and output enable inputs for managing data flow.

Feature Summary

• Integrates octal D-type registers with tri-state outputs for data latching and transmission
• Supports bidirectional data transfer controlled by dedicated direction input
• Features independent output enable controls for isolating bus lines

Applications

• Memory systems requiring registered data buffering
• Microprocessor-based architectures needing bidirectional bus interfaces
• Communication systems utilizing registered data paths

Procurement Notes

Verify the specific manufacturer source, as Fairchild Semiconductor assets are managed by onsemi. Confirm the package type matches the SOIC-24 specification. Ensure the component meets the required operating temperature range for the intended application environment before finalizing procurement.

Selection Notes

Select this component when registered bidirectional data transfer is required in high-speed digital circuits. The Advance Schottky technology offers improved switching performance compared to standard Schottky counterparts. Verify that the system voltage and load requirements align with the device's electrical characteristics.

Part Context

This part belongs to the DM74AS family of Advance Schottky logic devices. These components are designed for memory, microprocessor, and communication systems. The family provides low impedance outputs suitable for driving terminated transmission lines while maintaining high input impedance.

Replacement Considerations

Check for equivalents such as SN74AS646 from Texas Instruments or other manufacturers offering compatible AS-series registered bus transceivers. Ensure pinout compatibility and identical logical functionality before substitution.