MC74F646DWR2

Overview

The MC74F646DWR2 is an octal registered bus transceiver from the F/FAST logic series, manufactured by onsemi. It features eight non-inverting channels with D-type flip-flop registers and three-state outputs in a 24-pin SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 10 ns at 5 V and output drive currents of -24 mA (high) and 24 mA (low). It supports CMOS input levels and functions as a bidirectional data buffer with storage capability.

Feature Summary

• Integrates octal D-type flip-flops for temporary data storage within the bus transceiver architecture
• Provides three-state outputs to facilitate efficient multi-driver bus systems
• Supports bidirectional data transfer between two independent buses

Applications

• High-speed data buffering in computer systems
• Clocking and latching operations in digital circuits
• Memory mapping applications requiring registered interfaces

Procurement Notes

Verify component authenticity through authorized distributors or certified suppliers. Confirm lot traceability and RoHS compliance status prior to procurement. Ensure handling procedures account for moisture sensitivity classification. Validate that the specific revision matches design requirements. Check for obsolescence notices as availability may be limited.

Selection Notes

Select this component when high-speed registered buffering is required in 5 V logic environments. Compare propagation delays against system timing constraints. Verify compatibility with existing bus architectures and voltage levels. Consider package availability and thermal characteristics for the target application layout.

Part Context

This part belongs to the MC74F646 family of registered bus transceivers. It serves as a bridge between microprocessors and peripheral devices, offering both transmission and storage functions. The F-series designation indicates fast switching speeds suitable for demanding digital applications.

Replacement Considerations

Check for direct pin-compatible substitutes such as the MC74F646DW variant. Verify functional equivalence regarding propagation delay and output drive strength before substitution.