Overview
The SN74HC74DG4, produced by Texas Instruments, is a dual D-type positive-edge-triggered flip-flop integrated circuit. This device is part of the 74HC series, known for its high-speed CMOS logic and low power consumption. The SN74HC74DG4 contains two independent D-type flip-flops, each with asynchronous preset and clear pins, making it versatile for various digital logic applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| Operating Temperature (TA) | -40 | 85 | °C | |
| 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 |
| Clock Frequency (fmax) | 6 (VCC=2V) | 31 (VCC=4.5V) | 36 (VCC=6V) | MHz |
| Propagation Delay (tpd) | 70 (VCC=2V) | 20 (VCC=4.5V) | 15 (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 |
Key Features
- Buffered inputs
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: -40°C to +85°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Balanced CMOS push-pull outputs capable of sinking and sourcing similar currents
Applications
- Convert a momentary switch to a toggle switch
- Divide a clock signal by 2 or 4
- General-purpose digital logic circuits requiring flip-flops
Q & A
- What is the SN74HC74DG4?
The SN74HC74DG4 is a dual D-type positive-edge-triggered flip-flop integrated circuit produced by Texas Instruments.
- What are the operating voltage and temperature ranges of the SN74HC74DG4?
The operating voltage range is 2 V to 6 V, and the operating temperature range is -40°C to +85°C.
- What types of packages are available for the SN74HC74DG4?
The device is available in various packages including SOIC, SSOP, PDIP, SO, TSSOP, CDIP, CFP, and LCCC.
- What is the maximum clock frequency for the SN74HC74DG4?
The maximum clock frequency varies by voltage: 6 MHz at 2 V, 31 MHz at 4.5 V, and 36 MHz at 6 V.
- What is the propagation delay of the SN74HC74DG4?
The propagation delay ranges from 70 ns at 2 V to 15 ns at 6 V.
- Can the SN74HC74DG4 drive LSTTL loads?
Yes, it supports fanout up to 10 LSTTL loads.
- What are some common applications of the SN74HC74DG4?
Common applications include converting a momentary switch to a toggle switch and dividing a clock signal by 2 or 4.
- How should the outputs of the SN74HC74DG4 be managed to prevent damage?
The outputs should be managed to prevent over-current by limiting the output power according to the electrical and thermal limits defined in the datasheet.
- What is the significance of the balanced CMOS push-pull outputs in the SN74HC74DG4?
The balanced CMOS push-pull outputs allow the device to sink and source similar currents, ensuring robust output drive capability.
- How should the capacitive load at the output be managed for optimal performance?
The capacitive load at the output should be ≤ 70 pF to ensure optimal performance.
