CD74HCT109E

Overview

The CD74HCT109E is a dual J-K type flip-flop from the HCT logic series, manufactured by Harris Corporation. It features asynchronous set and reset capabilities with Schmitt trigger clock inputs for noise immunity. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a maximum propagation delay of 40 ns at 4.5 V with a 50 pF load, a typical maximum frequency (fMAX) of 54 MHz, and output currents of 4 mA high and low. It is housed in a PDIP-16 package.

Feature Summary

• Dual J-K flip-flops with asynchronous set and reset functions
• Schmitt trigger clock inputs for enhanced noise immunity
• High-speed operation with typical fMAX of 54 MHz
• Differential outputs with 4 mA drive capability

Applications

• Synchronous digital counting circuits
• Data storage and register applications
• State machine implementations
• Frequency division circuits

Procurement Notes

Verify manufacturer origin as Harris Corporation or authorized successor entities due to historical acquisitions. Confirm RoHS compliance status, as original Harris versions may not meet current standards. Check part status for obsolescence and ensure package integrity matches PDIP-16 specifications. Validate datasheet revision SCHS140E for accurate electrical characteristics before integration.

Selection Notes

Select this component when dual J-K flip-flops with Schmitt trigger inputs are required for noise-sensitive environments. Ensure compatibility with HCT logic levels for interfacing with HC/HCT families. Verify that the 40 ns propagation delay meets system timing requirements. Consider the PDIP-16 through-hole package constraints for PCB layout and assembly processes.

Part Context

The CD74HCT109E belongs to the 74HCT family, designed for CMOS technology with TTL-compatible inputs. Originally produced by Harris Semiconductor, these components were later integrated into Texas Instruments' portfolio following corporate acquisitions. The device represents a standard solution for dual flip-flop applications requiring high-speed performance and robust input characteristics in industrial and commercial electronics.

Replacement Considerations

CD74HC109 offers similar functionality with HC series characteristics. CD54HCT109 provides military-grade temperature range options. Verify pinout compatibility and electrical parameter overlaps before substitution.