IDT74FCT645ATQ

Overview

The IDT74FCT645ATQ is an octal bus transceiver belonging to the FCT logic series, manufactured by Integrated Device Technology. It features a single functional unit with eight bidirectional data channels and true output polarity. The device utilizes CMOS technology and operates within a standard voltage range typical for this family. It is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) designed for surface-mount applications. The component supports TTL input and output levels, ensuring compatibility with various digital systems.

Feature Summary

• Provides bidirectional data transmission across eight independent channels controlled by a single direction signal.
• Features true output polarity to maintain signal integrity without inversion during data transfer.
• Incorporates three-state outputs to allow safe connection to shared system buses.
• Designed with low ground bounce characteristics to minimize switching noise.

Applications

• High-speed memory bus interfaces
• Microprocessor-based system data routing
• Control signal distribution networks

Procurement Notes

Verify the specific suffix 'ATQ' against the manufacturer's current datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the sourcing channel provides traceability documentation consistent with Integrated Device Technology or Renesas standards. Confirm that the component meets the required environmental compliance standards for the intended deployment region before finalizing procurement orders.

Selection Notes

Select this component when an octal bidirectional interface with fast CMOS speed and low power consumption is required. It serves as a direct replacement for older bipolar FAST series devices while offering improved performance metrics. Consider the TSSOP-20 footprint constraints and verify that the target PCB layout accommodates the specific pin pitch requirements of this package style.

Part Context

This part belongs to the widely adopted 74FCT logic family, which bridges the performance gap between standard TTL and high-speed CMOS technologies. Integrated Device Technology, now part of Renesas Electronics, produced this series for demanding digital logic applications requiring reliable data transfer rates and robust electrical characteristics in compact form factors.

Replacement Considerations

Compatible substitutes include PI74FCT645CTHX from Pericom/Diodes Incorporated and P74FCT645ATP from Pyramid Semiconductor. Verify pinout compatibility and operating temperature ranges before substituting these alternative manufacturers' components into existing designs.