74HC74D – NXP

Overview

The NXP 74HC74D is a dual D-type flip-flop IC, crucial for state retention and sequential logic in digital systems. Its primary function is to capture and hold data at its D input on the rising edge of the clock signal, making it ideal for buffering and frequency division. A key design consideration when implementing the 74HC74D is managing the setup and hold times relative to the clock transition; exceeding these parameters, particularly in high-speed designs, can lead to metastable states or incorrect data capture, a common trade-off in achieving high-speed CMOS operation with minimal power dissipation.

Key Features

• Dual D-Type Flip-Flop with independent Preset and Clear
• Maximum Clock Frequency (fMAX): 77 MHz (typ.) at VCC = 5V
• Low Quiescent Current (ICC): 2.0 µA (max) at 25°C
• Balanced Propagation Delays (tPLH ≈ tPHL)
• Wide Operating Voltage Range: 2.0V to 6.0V
• Operating Temperature Range: -40°C to 125°C

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Synchronous data latching in microcontroller interfaces
• Implementing state machines for control logic
• Frequency division circuits for clock generation
• Data buffering and temporary storage in digital signal processing