74HC646D,652

Overview

The 74HC646D,652 is an octal bus transceiver and register manufactured by NXP USA Inc. It features a 24-pin SO package and operates with non-inverting outputs. The device supports a supply voltage range of 2.0V to 6.0V and includes three-state outputs for effective bus driving. It is designed as a high-speed Si-gate CMOS device compatible with low power Schottky TTL (LSTTL) standards.

Feature Summary

• Octal bus transceiver functionality with integrated register capability
• Three-state outputs enabling efficient multi-driver bus systems
• Non-inverting signal transmission for direct data path integrity

Applications

• High-speed data bus interfacing in digital systems
• Memory buffer applications requiring registered storage
• Bus driver circuits for bidirectional data transfer

Procurement Notes

Verify component status carefully as the 74HC646D,652 variant may be obsolete or discontinued according to specific distributor records. Confirm availability through official NXP channels or authorized partners before finalizing procurement plans. Ensure the suffix matches required specifications.

Selection Notes

Select this component when an octal transceiver with registration is required for 3-state bus architectures. It serves as a suitable alternative for designs needing LSTTL compatibility with CMOS performance levels. Verify pinout compatibility with existing PCB layouts during the design phase.

Part Context

This part belongs to the 74HC/HCT646 family of octal bus transceivers. These devices are widely used in general-purpose digital logic applications where high-speed switching and bus isolation are necessary. The HC series offers standard CMOS performance characteristics.

Replacement Considerations

Check for 74HCT646 variants if higher noise immunity at lower voltages is needed. Verify cross-compatibility with other octal transceivers from different manufacturers ensuring identical pin configurations and electrical parameters.