CY74FCT646ATSOCTE4

Overview

The CY74FCT646ATSOCTE4 is an octal registered bus transceiver manufactured by Texas Instruments. It operates within a supply voltage range of 4.75V to 5.25V and features TTL-compatible input and output levels. The device provides three-state outputs with a low-level output current of 64mA and a high-level output current of -32mA. It exhibits a propagation delay of 9ns and functions in non-inverting polarity. The component is housed in a 20-pin SOIC package and supports surface mount installation across an operating temperature range of -40°C to +85°C.

Feature Summary

• Octal registered bus transceiver architecture
• Three-state output capability
• TTL-compatible input and output levels

Applications

• High-speed data bus systems
• Memory buffer applications
• Clock driver circuits

Procurement Notes

Verify the specific suffix 'E4' against the manufacturer's official documentation to confirm compliance with RoHS3 directives and lead-free status. Ensure the selected package variant matches the required PCB footprint, as the SOIC-20 configuration differs from other available packages in the series. Confirm availability through authorized distributors given potential lifecycle variations.

Selection Notes

Select this component for designs requiring registered data storage on a bidirectional bus with high drive strength. The 9ns propagation delay suits moderate-speed digital interfaces. Verify that the 4.75V minimum supply voltage aligns with the system power rails. Consider the 64mA low-level sink current for driving heavy capacitive loads or multiple downstream inputs without signal degradation.

Part Context

This part belongs to the CY74FCT646T logic family, which integrates registered bus transceivers. The 'A' suffix typically denotes an advanced version with optimized performance characteristics compared to standard variants. The 'E4' suffix indicates environmental compliance, specifically regarding restricted substances. This family serves as a bridge between microprocessors and peripheral devices in industrial and commercial electronics.

Replacement Considerations

The CY74FCT646TQCT is listed as a similar alternative. Verify pinout compatibility and electrical specifications before substitution. Check if the QFP package requires different PCB layout adjustments compared to the SOIC form factor.