74HC374 (Octal D Flip Flop 3-state)

Overview

The 74HC374 is a high-speed, octal D-type flip-flop with 3-state outputs, designed for use in bus-oriented digital systems. It features eight D-type flip-flops with a common clock (CP) and a common output enable (OE) input. When OE is low, the outputs follow the data stored in the flip-flops; when high, the outputs are placed in a high-impedance state, allowing multiple devices to share a common bus without contention. This IC is ideal for applications such as data storage, register implementation, and bus interfacing in microcontroller and logic circuits.

Key Features

• Octal D-Type Flip-Flop: Eight independent D-type flip-flops in a single 20-pin package.
• 3-State Outputs: Outputs can be disabled (high-impedance) for bus-oriented applications.
• Common Clock and Output Enable: Simplifies control and reduces wiring.
• High-Speed Operation: Propagation delay typically 12 ns at 5V, suitable for high-frequency applications.
• Wide Operating Voltage: 2V to 6V, compatible with TTL, CMOS, and many microcontroller logic levels.
• Low Power Consumption: CMOS technology ensures minimal power dissipation.
• Direct Interface with Microcontrollers: Outputs can drive LEDs, relays, or other ICs directly.

Technical Specifications

• Logic Family: HC (High-Speed CMOS)
• Number of Bits: 8
• Output Type: 3-State
• Supply Voltage (VCC): 2V to 6V
• Input Voltage (VIN): 0V to VCC
• Output Current (IOH/IOL): ±5.2 mA at 5V
• Propagation Delay (tPD): 12 ns (typical) at 5V, CL=50pF
• Maximum Clock Frequency: 30 MHz (typical) at 5V
• Operating Temperature Range: -40°C to +85°C
• Package: 20-pin DIP, SOIC, or SOP (depending on variant)

Applications & Use Cases

• Bus-Oriented Data Storage: Ideal for registers in microprocessor systems where multiple devices share a data bus.
• State Machine Implementation: Use as a register to store state information in sequential logic circuits.
• Data Buffering: Provide temporary storage and isolation between different logic blocks.
• Microcontroller I/O Expansion: Interface with 8-bit microcontrollers to expand output ports.
• Digital Instrumentation: Used in counters, timers, and data acquisition systems.
• Address Decoding: Store address lines or control signals in memory-mapped I/O.

What's Included

• 1 x 74HC374 Octal D-Type Flip-Flop IC (DIP-20 package)

Compatibility

• Logic Levels: TTL-compatible, works with 5V and 3.3V systems when level shifting is applied.
• Microcontrollers: Works with Arduino, Raspberry Pi (with level shifter), PIC, AVR, STM32, and other digital logic.
• Other ICs: Can be cascaded with other flip-flops (e.g., 74HC373) for larger register sizes.
• Breadboard Friendly: DIP package fits standard breadboards and perfboards.

MOKWN Recommendation

The 74HC374 is an essential component for electronics enthusiasts and professionals working on digital projects. Its 3-state outputs make it perfect for bus systems, and its high-speed CMOS technology ensures reliable performance. Whether you're building a retro computer, expanding your microcontroller's I/O, or learning digital electronics, this IC is a solid choice. Pair it with other 74-series logic ICs available at MOKWN to complete your project.