74 HC 74 Dual D-Type Flip Flop IC - DIP-14

Description

The 74HC74 Dual D-Type Flip-Flop IC is a highly versatile digital logic component belonging to the High-Speed CMOS (74HC) logic family. Housed in a standard 14-pin Dual Inline Package (DIP), this integrated circuit contains two independent, positive-edge-triggered D-type flip-flops. Each flip-flop is equipped with its own individual Data (D), Clock (CP), Set (SD), and Reset (RD) inputs, alongside complementary Q and Q-bar outputs.

Available at Tomson Electronics, the 74HC74 is a fundamental building block for hardware engineers and students designing sequential logic circuits. Because it utilizes CMOS technology, it boasts very low power consumption and a wide operating voltage range of 2.0V to 6.0V. This makes it perfectly compatible with both 3.3V modern microcontrollers and standard 5V digital logic systems. It is widely used for creating shift registers, frequency dividers, and reliable data storage registers.

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Specifications

• Logic Family: 74HC (High-Speed CMOS)
• Logic Function: Dual D-Type Positive-Edge-Triggered Flip-Flop
• Package Type: 14-Pin DIP (Through-hole)
• Operating Supply Voltage (Vcc): 2.0V to 6.0V DC
• Propagation Delay (Typical): 15 ns at 5V
• Output Source/Sink Current: 4 mA / 4 mA (Typical at 5V)
• Operating Temperature Range: -40°C to +85°C

Datasheet

Download 74HC74 Datasheet PDF

Applications

• Data Registers: Capturing and temporarily holding 1-bit binary values in memory buffer circuits and state machines.
• Frequency Dividers: Halving the frequency of an incoming clock signal by feeding the Q-bar output back into the Data (D) input.
• Shift Registers: Cascading multiple flip-flops together to transfer binary data serially across a logic board.
• Pulse Synchronizers: Aligning asynchronous external input signals to a master system clock to prevent logic metastability.

Frequently Asked Questions (FAQ)

Q: What does "positive-edge-triggered" mean?
A: It means the flip-flop only reads the state of the Data (D) pin at the exact fraction of a second when the Clock pin transitions from LOW to HIGH (the rising edge). Changes to the D pin while the clock is steady (either HIGH or LOW) will be completely ignored.

Q: What is the purpose of the Set (SD) and Reset (RD) pins?
A: These are asynchronous override pins. Driving the Set pin LOW immediately forces the Q output HIGH, regardless of the clock. Driving the Reset pin LOW immediately forces the Q output LOW. In normal operation, if you don't need to override the flip-flop, both SD and RD should be tied HIGH (to Vcc).

Q: Can I use this IC to debounce a switch?
A: Yes, flip-flops are excellent for switch debouncing. By utilizing the Set and Reset pins connected to a Single-Pole Double-Throw (SPDT) switch, you can create a perfectly clean, bounce-free digital output transition.

Package Includes

• 1 × 74HC74 Dual D-Type Flip-Flop IC – DIP-14