The TC74HC74FN is a high-speed CMOS Dual D-Type Flip-Flop with Set and Reset manufactured by Toshiba Semiconductor and Storage. This device utilizes silicon gate C2MOS technology to achieve high-speed operation similar to equivalent Bipolar Schottky TTL, while maintaining the low power consumption inherent in CMOS integrated circuits.

Applications

• Registers
• Shift Registers
• Memory Units
• Control Circuits
• Sampling Systems
• Data Transfer

Features

• High-Speed Operation: Propagation delay times similar to LSTTL.
• Low Power Consumption: ICC = 4 μA (max) at Ta = 25°C.
• High Noise Immunity: VNIH = VNIL = 28 % VCC (min).
• Output Drive Capability: 10 LSTTL Loads.
• Symmetrical Output Impedance: |IOH| = IOL = 4 mA (min).
• Balanced Propagation Delays: tPLH ≈ tPHL.
• Wide Operating Voltage Range: VCC = 2 V to 6 V.

Benefits

• Improved system performance due to high-speed operation.
• Reduced power consumption, leading to energy efficiency and longer battery life in portable devices.
• Enhanced noise immunity for reliable operation in noisy environments.
• Direct compatibility with LSTTL logic circuits, simplifying system design and upgrades.
• Stable and predictable performance across a wide range of operating conditions.
• Simplified circuit design due to symmetrical output impedance and balanced propagation delays.

Additional Details

The TC74HC74FN operates over a wide temperature range, typically -40°C to +85°C, making it suitable for various industrial and commercial applications. Each flip-flop features independent set (S) and reset (R) inputs, as well as clock (CK) and data (D) inputs. The device is supplied in a small outline package, allowing for high-density circuit board layouts.

The TC74HC74FN’s inputs are equipped with protection circuits against static discharge, providing greater reliability during handling and operation. The device conforms to JEDEC standards for CMOS integrated circuits. The output of each flip-flop changes on the positive-going transition of the clock pulse, subject to the setup and hold time requirements. The set and reset inputs override the clock and data inputs, allowing for asynchronous control of the flip-flop’s state. When both set and reset are low, the flip-flop operates in its normal clocked mode. When both set and reset are high, the output is unpredictable. Therefore, avoid keeping set and reset inputs high simultaneously.