Overview
The 74HC74D, produced by NXP USA Inc., is a dual D-type flip-flop integrated circuit. This component is part of the 74HC family and is fabricated using silicon gate C2MOS technology. It is designed to operate at high speeds similar to LSTTL (Low-power Schottky Transistor-Transistor Logic) while maintaining the low power dissipation characteristics of CMOS (Complementary Metal-Oxide-Semiconductor) technology.
The 74HC74D features individual data, clock, set, and reset inputs, along with complementary Q and Qbar outputs. The flip-flop stores the data at the D-input during the positive-going transition of the clock pulse, and it includes independent set and reset inputs that can be used regardless of the clock state.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2.0 to 6.0 | V |
| Input Voltage (VIN) | -0.5 to VCC + 0.5 | V |
| Output Voltage (VOUT) | -0.5 to VCC + 0.5 | V |
| Operating Temperature (Tamb) | -40 to 125 | °C |
| Maximum Clock Frequency (fMAX) | 82 MHz (typ. at VCC = 5 V) | MHz |
| Propagation Delay Time (tPLH, tPHL) | 14 ns (typ. at VCC = 5 V, CL = 50 pF) | ns |
| Output Drive Capability | ± 5.2 mA | mA |
| Quiescent Supply Current (ICC) | 2.0 µA (max at Ta = 25 °C) | µA |
| Package Type | SO14 (SOT108-1) | - |
| ESD Protection | HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V | - |
Key Features
- High Speed Operation: Achieves high speed operation similar to LSTTL while maintaining low power dissipation of CMOS technology.
- Wide Operating Voltage Range: Operates over a voltage range of 2.0 to 6.0 V.
- Wide Operating Temperature Range: Specified from -40 °C to +125 °C.
- Balanced Propagation Delays: Ensures symmetrical propagation delays (tPLH ≈ tPHL).
- High Noise Immunity: Features Schmitt-trigger action in the clock input, making it tolerant to slower clock rise and fall times.
- ESD Protection: Includes protection against static discharge and transient excess voltage (HBM and CDM compliant).
- Multiple Package Options: Available in various package types, including SO14 (SOT108-1).
Applications
The 74HC74D is versatile and can be used in a variety of digital circuit applications, including:
- Sequential Logic Circuits: Ideal for use in counters, shift registers, and other sequential logic circuits.
- Memory Elements: Can be used as memory elements in digital systems due to its D-type flip-flop functionality.
- Timing and Synchronization: Useful in timing and synchronization circuits where precise clocking is required.
- General Digital Logic: Suitable for general-purpose digital logic applications where high speed and low power consumption are necessary.
Q & A
- What is the operating voltage range of the 74HC74D?
The operating voltage range of the 74HC74D is from 2.0 to 6.0 V.
- What is the maximum clock frequency of the 74HC74D?
The maximum clock frequency of the 74HC74D is typically 82 MHz at VCC = 5 V.
- What is the propagation delay time of the 74HC74D?
The propagation delay time (tPLH, tPHL) is typically 14 ns at VCC = 5 V and CL = 50 pF.
- What type of ESD protection does the 74HC74D have?
The 74HC74D has ESD protection compliant with HBM (ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V) and CDM (ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V)).
- What is the package type of the 74HC74D?
The 74HC74D is available in the SO14 (SOT108-1) package type).
- What are the input logic levels for the 74HC74D?
The input logic levels for the 74HC74D are CMOS levels, with high-level input voltage typically between 1.5 to 4.2 V and low-level input voltage typically between 0.5 to 1.8 V).
- How does the 74HC74D handle clock transitions?
The 74HC74D stores the data at the D-input during the positive-going transition of the clock pulse, and it includes Schmitt-trigger action in the clock input for better tolerance to slower clock rise and fall times).
- What is the quiescent supply current of the 74HC74D?
The quiescent supply current (ICC) of the 74HC74D is typically 2.0 µA (max) at Ta = 25 °C).
- Can the 74HC74D be used in high-temperature environments?
Yes, the 74HC74D is specified to operate from -40 °C to +125 °C).
- What are some common applications of the 74HC74D?
The 74HC74D is commonly used in sequential logic circuits, memory elements, timing and synchronization circuits, and general digital logic applications).
