74VHC74SJ

Overview

The Fairchild Semiconductor 74VHC74SJ is a dual D-type flip-flop with positive-edge triggering, belonging to the advanced high-speed CMOS VHC logic family. It features independent data (D) and clock (CLK) inputs for each flip-flop, along with asynchronous active-low clear (CLRn) and preset (PREn) controls. The device operates within a supply voltage range of 2.0V to 5.5V and utilizes a 14-pin Small Outline Integrated Circuit (SOIC) package. Key electrical parameters include a maximum propagation delay of 9.3ns at 5V with 50pF load, output drive currents of ±8mA, and a typical operating frequency up to 115MHz.

Feature Summary

• Dual D-type flip-flops with positive-edge triggered operation
• Asynchronous active-low clear and preset control inputs
• High-speed performance compatible with Bipolar TTL speeds
• Low power dissipation inherent to CMOS technology

Applications

• Parallel-to-serial data conversion circuits
• Shift register implementations
• General-purpose digital storage elements
• Timing and synchronization applications

Procurement Notes

Verify the specific suffix 'SJ' corresponds to the SOIC-14 package variant when sourcing. Confirm RoHS compliance status as manufacturing sources may vary. Ensure the supplier provides official datasheets matching the Fairchild or ON Semiconductor part number to guarantee correct pinout and electrical characteristics. Cross-reference package dimensions against JEDEC standards for PCB footprint accuracy.

Selection Notes

Select this component for designs requiring dual edge-triggered storage with low power consumption. The VHC series offers speed comparable to older bipolar technologies while maintaining CMOS advantages. Consider the 2V to 5.5V operating range for compatibility with various logic levels. Verify that the asynchronous control functions meet the system's reset and initialization requirements.

Part Context

The 74VHC74SJ belongs to the 74VHC logic family, representing an evolution of standard 74-series digital logic. It is manufactured by Fairchild Semiconductor, which has since been acquired by ON Semiconductor. This part serves as a direct replacement for legacy 74HC74 devices in modern designs requiring enhanced speed and lower power profiles within the same functional framework.

Replacement Considerations

The MM74VHC74MTCX is a documented substitute offering identical logical functionality in a TSSOP-14 package. Designers must verify pinout compatibility and adjust PCB footprints if switching between SOIC and TSSOP packages. Electrical specifications remain consistent across these package variants within the same logic family.