CD74AC109E

Overview

The CD74AC109E is a dual J-K positive-edge-triggered flip-flop manufactured by Texas Instruments. It features independent preset and clear inputs for direct control of the output state. The device operates within a supply voltage range of 2V to 6V, supporting standard AC logic levels. It is housed in a 16-pin PDIP package suitable for through-hole mounting. The component is rated for an extended operating temperature range from -55°C to +125°C, ensuring reliability in demanding environments.

Feature Summary

• Dual J-K flip-flops with positive-edge triggering
• Independent active-low preset and clear inputs
• High-speed AC logic family performance

Applications

• Parallel data storage registers
• Shift register construction
• Frequency division circuits

Procurement Notes

Verify that the specific part number matches the required AC logic series and PDIP-16 package configuration. Confirm the temperature grade aligns with industrial or military requirements if applicable. Ensure the datasheet revision corresponds to the design specifications for timing parameters.

Selection Notes

Select this component when dual independent flip-flops with preset and clear functions are needed. Consider the AC speed characteristics and wide voltage tolerance compared to other logic families. Evaluate the through-hole packaging requirement against available PCB layout constraints.

Part Context

This device belongs to the Texas Instruments 74AC logic family, known for high speed and low power consumption. It serves as a fundamental building block for sequential logic circuits. The E suffix indicates the plastic DIP package variant, widely used in prototyping and legacy system designs.

Replacement Considerations

SN74AC109N

FAQ

What is the trigger mechanism for the CD74AC109E?

The flip-flops are triggered on the positive edge of the clock signal.

How are the preset and clear functions controlled?

Both preset and clear inputs are active-low, allowing direct asynchronous control of the output states.