74AHCT74D,112

Overview

The Nexperia 74AHCT74D,112 is a dual D-type flip-flop with set and reset inputs, operating on positive-edge triggering. It belongs to the AHCT logic series, ensuring compatibility with TTL input levels while utilizing CMOS technology. The device features complementary outputs (Q and Q) and asynchronous active-low set and reset functions independent of the clock signal. Packaged in a 14-SOIC surface-mount format, it supports a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 3.3 ns, output currents of ±8 mA, and an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Dual positive-edge triggered D-type flip-flops with individual data, clock, set, and reset inputs
• Asynchronous active-low set and reset operations independent of the clock signal
• Schmitt-trigger action on the clock input for tolerance to slow rise and fall times
• Complementary outputs providing both Q and Q states

Applications

• Parallel-to-serial and serial-to-parallel data conversion circuits
• Digital state storage and register applications
• Timing and synchronization control systems
• Frequency division and pulse stretching circuits

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific manufacturing date codes relevant to project requirements. Note that this part number may be subject to end-of-life notices; validate current production status before finalizing procurement plans to avoid supply chain disruptions.

Selection Notes

Select this component when TTL-compatible input levels are required within a CMOS system architecture. The AHCT series ensures seamless interfacing with legacy TTL logic families. Consider the wide operating temperature range and robust ESD protection specifications for industrial environments. Ensure the 14-SOIC package dimensions align with the target PCB layout constraints.

Part Context

This component is part of the extensive 74-series logic family, specifically the high-speed AHCT variant designed for 5 V operation. It serves as a fundamental building block for sequential logic design, offering reliable data storage capabilities. The device integrates standard set and reset functionalities, making it suitable for complex digital systems requiring precise state management and initialization control.

Replacement Considerations

Direct substitutes include the 74AHC74D,112, which offers similar functionality but with CMOS input levels instead of TTL compatibility. Other potential replacements within the same package and pinout configuration should be evaluated based on specific electrical parameter matches and availability status.

FAQ

Are the set and reset inputs synchronous or asynchronous?

The set and reset inputs are asynchronous and active-low, meaning they operate independently of the clock signal.

What is the function of the Schmitt trigger on the clock input?

The Schmitt trigger action provides high tolerance to slower clock rise and fall times, ensuring reliable triggering even with imperfect signal edges.

Does the device support partial power-down mode?

No, partial power-down mode with I_OFF circuitry is a feature of the 74ABT74 series, not the 74AHCT74.