MC74AC646DW

Overview

The MC74AC646DW is an octal registered bus transceiver manufactured by onsemi, belonging to the AC logic series. It features non-inverting outputs and operates within a supply voltage range of 2V to 6V. The device utilizes a 24-pin SOIC surface-mount package and supports an operating temperature range from -40°C to 85°C. It provides three-state outputs capable of sourcing and sinking 24mA, with inputs that are TTL compatible in the ACT variant.

Feature Summary

• Registered bus transceiver architecture enabling multiplexed transmission of data directly from input buses or internal storage registers.
• Independent D-type flip-flops for A and B buses allow selection between real-time and stored data transfers.
• Three-state outputs facilitate efficient bus-oriented applications with high drive capability.

Applications

• Multiplexed transmission of registered and real-time data in digital systems
• Bus-oriented interface circuits requiring controlled data flow
• Octal data latching and buffering in microprocessor systems

Procurement Notes

Verify the specific suffix 'DW' confirms the 24-pin SOIC plastic package configuration. Confirm RoHS compliance status as manufacturing specifications may vary by production batch. Check current availability status as older logic families may have limited stock or end-of-life implications. Ensure the required voltage range aligns with system power supplies.

Selection Notes

Select this component when an octal transceiver with integrated registration is required for bidirectional data transfer. The AC series offers higher speed than standard LS logic while maintaining CMOS low power characteristics. Verify that the 24-pin SOIC footprint matches the PCB layout constraints. Consider the ACT variant if TTL-compatible input thresholds are necessary for interfacing with legacy logic levels.

Part Context

This part belongs to the 74AC family of high-speed CMOS logic devices produced by onsemi. It is functionally related to other octal transceivers like the 74AC245 but includes internal register storage capabilities. The device serves as a bridge between different data domains, allowing data to be captured and held before transmission.

Replacement Considerations

MC74ACT646DWG is a verified equivalent offering identical functionality with lead-free packaging and potentially updated manufacturing revisions. Both parts share the same logical operations and pinout configurations.