Overview
The SN74HC74DRE4, produced by Texas Instruments, is a dual D-type positive-edge-triggered flip-flop integrated circuit. This device contains two independent flip-flops, each with asynchronous preset and clear pins. It is part of the 74HC series, known for its high-speed CMOS logic and wide operating voltage range. The SN74HC74DRE4 is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) package, making it suitable for a variety of digital circuit applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Clock Frequency (fclock) | 6 (VCC=2V), 31 (VCC=4.5V), 36 (VCC=6V) | MHz | ||
| Propagation Delay (tpd) | 70 (VCC=2V), 20 (VCC=4.5V), 15 (VCC=6V) | 230 (VCC=2V), 46 (VCC=4.5V), 39 (VCC=6V) | ns | |
| Transition Time (tt) | 28 (VCC=2V), 8 (VCC=4.5V), 6 (VCC=6V) | 95 (VCC=2V), 19 (VCC=4.5V), 16 (VCC=6V) | ns | |
| ESD Rating (HBM) | ±2000 | V | ||
| ESD Rating (CDM) | ±1500 | V |
Key Features
- Buffered Inputs: Ensures stable input signals.
- Wide Operating Voltage Range: 2 V to 6 V, making it versatile for various applications.
- Wide Operating Temperature Range: -40°C to +85°C, suitable for harsh environments.
- Low Power Consumption: Maximum ICC of 40 µA, reducing power requirements.
- High Fanout Capability: Can drive up to 10 LSTTL loads.
- Fast Switching Times: Typical propagation delay of 15 ns at 5 V.
- Balanced CMOS Push-Pull Outputs: Capable of sinking and sourcing similar currents, ensuring balanced output performance.
Applications
- Convert a Momentary Switch to a Toggle Switch: Useful in control circuits where a toggle function is needed.
- Divide a Clock Signal by 2 or 4: Commonly used in digital timing and clock circuits.
- General Digital Logic Circuits: Suitable for use in a wide range of digital logic applications due to its versatility and reliability.
Q & A
- What is the operating voltage range of the SN74HC74DRE4?
The operating voltage range is from 2 V to 6 V.
- What is the maximum clock frequency for the SN74HC74DRE4 at 5 V?
The maximum clock frequency at 5 V is 31 MHz.
- What is the propagation delay of the SN74HC74DRE4 at 5 V?
The typical propagation delay at 5 V is 15 ns.
- Can the SN74HC74DRE4 drive 10 LSTTL loads?
Yes, it can drive up to 10 LSTTL loads.
- What is the ESD rating for the SN74HC74DRE4 using the Human-Body Model (HBM)?
The ESD rating is ±2000 V.
- What is the operating temperature range for the SN74HC74DRE4?
The operating temperature range is from -40°C to +85°C.
- How many flip-flops are contained in the SN74HC74DRE4?
The device contains two independent D-type positive-edge-triggered flip-flops.
- What type of package is the SN74HC74DRE4 available in?
The SN74HC74DRE4 is available in a 14-pin SOIC package.
- What is the significance of the 'DRE4' suffix in the part number?
The 'DRE4' suffix indicates the specific packaging and environmental compliance (e.g., RoHS) of the device.
- How should unused inputs of the SN74HC74DRE4 be handled?
Unused inputs must be held at VCC or GND to ensure proper device operation.
