CD74HCT652M

Overview

The CD74HCT652M is an octal non-inverting bus transceiver and register manufactured by Texas Instruments. It features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device utilizes HCT logic, ensuring TTL-compatible input levels while providing high-speed performance with a propagation delay of approximately 10 ns at 5 V. It is housed in a 24-pin SOIC package and supports bidirectional data transfer between two buses.

Feature Summary

• Integrates eight D-type flip-flops with tri-state buffers for registered data storage and transmission
• Provides bidirectional data flow control via independent direction inputs
• Ensures system isolation through high-impedance states when disabled
• Compatible with standard CMOS logic families using TTL-compatible thresholds

Applications

• High-performance memory mapping systems requiring registered address latching
• Bidirectional data bus drivers in microprocessor-based architectures
• Clocked data buffering applications in industrial control systems
• Isolation stages in communication interfaces requiring signal regeneration

Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm package type and temperature rating. Ensure compatibility with existing board layouts regarding pin assignments and power requirements. Confirm RoHS compliance status if required by project specifications. Cross-reference ordering information with official distributor catalogs to avoid obsolete variants.

Selection Notes

Select this component when registered bidirectional data transfer is required with high noise immunity. The HCT series ensures compatibility with legacy TTL systems while offering improved speed over standard HC devices. Consider the 24-pin SOIC package constraints for PCB space limitations. Evaluate power consumption characteristics relative to other logic families in the design.

Part Context

This part belongs to the Texas Instruments 74HCT logic family, designed for high-speed digital applications. It serves as a registered version of the unbuffered bus transceiver, adding internal storage capability. The device is widely used in computing and telecommunications equipment where data integrity and timing precision are critical for system operation.

Replacement Considerations

CD74HCT652MT

FAQ

What is the function of the OE pins?

The Output Enable (OE) pins control the state of the outputs. When asserted low, the outputs are active; when high, they enter a high-impedance state.

How does the device handle bidirectional data flow?

Direction is controlled by separate DIR inputs. A high level enables data flow from port A to B, while a low level enables flow from B to A.