74AC646SCX

Buffers, Drivers, Receivers, Transceivers Overview

The onsemi 74AC646SCX is an octal bus transceiver and register featuring 3-state outputs in a 24-lead SOIC package. It supports independent registers for A and B buses, enabling multiplexed real-time and stored data transfers. The device operates within a supply voltage range of 2.0V to 6.0V and functions across temperatures from -40°C to +85°C. Key electrical characteristics include outputs capable of sourcing and sinking 24 mA, with propagation delays ranging from 1.0 ns to 18.5 ns depending on the specific signal path and load conditions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides registered bus transceiver functionality with D-type flip-flops and control circuitry for multiplexed data transmission.
• Features independent storage registers for both A and B buses, allowing simultaneous real-time and stored data handling.
• Equipped with 3-state outputs that can be enabled or disabled via control inputs.

Buffers, Drivers, Receivers, Transceivers Applications

• Multiplexed data transfer between system buses
• Registered I/O buffering in digital logic systems
• Data storage and retrieval applications requiring bidirectional flow

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the component origin, as the datasheet indicates Fairchild Semiconductor authorship prior to its acquisition by onsemi. Confirm the presence of the 'X' suffix for tape and reel packaging if required. Ensure the specific lot matches the 74AC series specifications rather than the 74ACT variant, which has different input thresholds. Cross-reference ordering codes to ensure correct package identification.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring dual independent registers for separate bus architectures. It is suitable for applications needing high drive capability (24 mA) and low quiescent current. Consider the AC series for broader voltage compatibility compared to ACT variants. Evaluate timing requirements against the specified propagation delay limits under expected load conditions.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74AC logic family, characterized by CMOS technology and high-speed operation. It is functionally similar to the MC74AC646 but packaged in surface-mount SOIC format. The device serves as a bridge between microprocessors and peripheral devices, facilitating efficient data management through its integrated storage capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

MC74AC646DWR2G is a documented equivalent offering identical octal transceiver/register functionality in a comparable SOIC-24 package. Verify pinout compatibility and electrical specifications before substitution.