CD74HC109E

Overview

The CD74HC109E is a dual J-K type flip-flop manufactured by Harris Corporation, belonging to the HC/UH logic series. It features single-ended inputs and differential outputs within a PDIP-16 through-hole package. The device operates on a supply voltage range of 2V to 6V. Key electrical parameters include a propagation delay of 30ns at nominal supply with 50pF load, high-level output current of -4mA, and low-level output current of 4mA. It supports set and reset functions.

Feature Summary

• Dual J-K flip-flop architecture providing two independent 1-bit storage elements per package
• Positive edge triggering mechanism for synchronous data capture
• Differential output configuration supporting complementary signal transmission
• Integrated preset and clear control functions for direct state initialization

Applications

• Digital counter circuits requiring binary state storage
• Shift register configurations for serial-to-parallel data conversion
• Frequency divider applications utilizing toggle mode operation
• Sequential logic systems requiring positive edge-triggered memory elements

Procurement Notes

Verify manufacturer origin as Harris Corporation rather than Texas Instruments, noting historical acquisition contexts. Confirm PDIP-16 through-hole packaging matches design requirements. Check RoHS compliance status as documentation indicates non-compliance for this specific variant. Validate operating temperature range specifications against environmental constraints. Ensure supply chain sources provide authentic Harris-branded components distinct from later TI production runs.

Selection Notes

Select this component when dual J-K functionality with positive edge triggering is required in a through-hole DIP package. The HC series offers CMOS compatibility with standard TTL input levels. Consider the 2V to 6V supply range for flexibility in lower voltage applications compared to HCT variants. Differential outputs simplify interface design for noise-sensitive environments. Verify that the 30ns propagation delay meets timing constraints for the target clock frequencies.

Part Context

The CD74HC109E belongs to the 74HC family of high-speed CMOS logic devices originally produced by Harris Semiconductor before its acquisition by Texas Instruments. This specific part number denotes the through-hole PDIP-16 variant. The HC series maintains pinout compatibility with earlier 74LS logic families while offering improved power consumption characteristics. As a dual J-K flip-flop, it serves as a fundamental building block for sequential digital logic designs requiring reliable state retention and controlled toggling behavior.

Replacement Considerations

CD74HC109M96: Surface mount SOIC-16 variant with identical logical function and electrical characteristics, suitable for PCB space-constrained designs.

FAQ

What is the trigger type for the CD74HC109E?

The device utilizes positive edge triggering for data capture.

Does the CD74HC109E support asynchronous control?

Yes, it includes set (preset) and reset (clear) functions for direct state control.