Overview
The SN74HC74D is a dual D-type positive-edge-triggered flip-flop integrated circuit produced by Texas Instruments. It is part of the 74HC Series of logic components and features two independent flip-flops with asynchronous preset and clear pins for each. This device is designed for a wide range of applications requiring clocked logic functions.
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 |
| Pulse Duration (tw) | 80 (VCC=2V) | 16 (VCC=4.5V) | 14 (VCC=6V) | ns |
| Setup Time before CLK↑ (tsu) | 100 (VCC=2V) | 20 (VCC=4.5V) | 17 (VCC=6V) | ns |
| Hold Time, Data after CLK↑ (th) | 0 | 0 | ns | |
| Propagation Delay (tpd) | 70 (VCC=2V) | 20 (VCC=4.5V) | 15 (VCC=6V) | ns |
Key Features
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: -40°C to +85°C
- Buffered inputs
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Low power consumption: 40-µA max ICC
- Typical propagation delay: 15 ns
- ±4-mA output drive at 5 V
- Low input current: 1 µA max
- Balanced CMOS push-pull outputs
- Clamp diode structure for input and output protection
Applications
- Convert a momentary switch to a toggle switch
- Divide a clock signal by 2 or 4
- Clocked logic functions in digital circuits
- Data storage and transfer in sequential logic circuits
Q & A
- What is the SN74HC74D?
The SN74HC74D is a dual D-type positive-edge-triggered flip-flop integrated circuit from Texas Instruments.
- What is the operating voltage range of the SN74HC74D?
The operating voltage range is from 2 V to 6 V.
- What is the maximum clock frequency for the SN74HC74D?
The maximum clock frequency is 36 MHz at VCC = 6 V.
- What is the propagation delay of the SN74HC74D?
The typical propagation delay is 15 ns.
- Can the SN74HC74D drive LSTTL loads?
- What are the asynchronous control inputs for the SN74HC74D?
The asynchronous control inputs are preset (PRE) and clear (CLR).
- What is the recommended operating temperature range for the SN74HC74D?
The recommended operating temperature range is -40°C to +85°C.
- How many flip-flops does the SN74HC74D contain?
- What is the significance of the clamp diode structure in the SN74HC74D?
The clamp diode structure provides input and output protection against voltage spikes.
- Can unused outputs be left floating?
