Overview
The 74HC74D is a high-speed CMOS D-type flip-flop integrated circuit fabricated with silicon gate C2MOS technology by Toshiba Semiconductor and Storage. This dual D-type flip-flop with preset and clear functions offers high-speed operation similar to LSTTL while maintaining the low power dissipation characteristic of CMOS technology. The device is designed to transfer the signal level applied to the D input to the Q output during the positive-going transition of the clock pulse. The clear and preset inputs are independent of the clock and can be set by applying an 'L' level to the respective input.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2.0 to 6.0 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Maximum Clock Frequency | 77 MHz (typ.) at VCC = 5 V | MHz |
| Quiescent Current | 2.0 µA (max) at Ta = 25°C | µA |
| Propagation Delay Time (CK-Q, Q) | 17 ns (max) at VCC = 6 V, CL = 50 pF | ns |
| Input Capacitance | 10 pF | pF |
| Output Current (High/Low) | 5.2 mA / 5.2 mA | mA |
| Package Type | SOIC14, TSSOP14 | |
| Trigger Type | Positive Edge |
Key Features
- Wide operating temperature range: -40°C to 125°C
- High speed operation: up to 77 MHz at VCC = 5 V
- Low power dissipation: maximum quiescent current of 2.0 µA at Ta = 25°C
- Balanced propagation delays: tPLH ≈ tPHL
- Wide operating voltage range: 2.0 to 6.0 V
- Independent clear and preset inputs
- Protection circuits against static discharge and transient excess voltage
Applications
The 74HC74D is suitable for a variety of applications requiring high-speed and low-power logic operations. These include:
- Digital counters and shift registers
- Sequential logic circuits
- Memory elements in digital systems
- Timing and control circuits in electronic devices
Q & A
- What is the operating voltage range of the 74HC74D?
The operating voltage range is from 2.0 V to 6.0 V. - What is the maximum clock frequency of the 74HC74D?
The maximum clock frequency is 77 MHz (typical) at VCC = 5 V. - What is the quiescent current of the 74HC74D?
The quiescent current is 2.0 µA (maximum) at Ta = 25°C. - What are the package types available for the 74HC74D?
The device is available in SOIC14 and TSSOP14 packages. - How does the clear and preset function work on the 74HC74D?
The clear and preset inputs are independent of the clock and can be set by applying an 'L' level to the respective input. - What is the propagation delay time of the 74HC74D?
The propagation delay time (CK-Q, Q) is approximately 17 ns (maximum) at VCC = 6 V, CL = 50 pF. - Is the 74HC74D protected against static discharge?
Yes, the device is equipped with protection circuits against static discharge and transient excess voltage. - What is the operating temperature range of the 74HC74D?
The operating temperature range is from -40°C to 125°C. - What is the input capacitance of the 74HC74D?
The input capacitance is 10 pF. - What are the typical output currents of the 74HC74D?
The output currents are 5.2 mA (high) and 5.2 mA (low).
