SN74S74DRE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual D-Type Positive-Edge-Triggered Flip-Flop with Clear and Preset
• Package: SOIC-14
• Essence: The SN74S74DRE4 is a dual flip-flop IC that can store and transfer binary data. It is designed to operate on positive-edge clock signals and offers additional features like clear and preset inputs.
• Packaging/Quantity: The SN74S74DRE4 is typically sold in reels of 2500 units.

Specifications

• Logic Family: TTL (Transistor-Transistor Logic)
• Number of Flip-Flops: 2
• Input Voltage: 2V - 6V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 12ns (max)
• Output Current: ±8mA
• Supply Voltage: 4.5V - 5.5V

Detailed Pin Configuration

The SN74S74DRE4 has a total of 14 pins, which are assigned specific functions as follows:

1. CLR (Clear Input) - Active low input used to reset the flip-flop.
2. D1 (Data Input 1) - Input for the first flip-flop.
3. CP1 (Clock Pulse 1) - Positive-edge triggered clock input for the first flip-flop.
4. PR1 (Preset 1) - Active low input used to set the flip-flop.
5. Q1 (Output 1) - Output of the first flip-flop.
6. Q̅1 (Complementary Output 1) - Complementary output of the first flip-flop.
7. GND (Ground) - Ground reference for the IC.
8. Q̅2 (Complementary Output 2) - Complementary output of the second flip-flop.
9. Q2 (Output 2) - Output of the second flip-flop.
10. PR2 (Preset 2) - Active low input used to set the second flip-flop.
11. CP2 (Clock Pulse 2) - Positive-edge triggered clock input for the second flip-flop.
12. D2 (Data Input 2) - Input for the second flip-flop.
13. VCC (Supply Voltage) - Positive supply voltage for the IC.
14. CLR̅ (Complementary Clear Input) - Complementary input for the clear function.

Functional Features

• Dual flip-flop design allows independent storage and transfer of data in two separate circuits.
• Positive-edge triggering ensures reliable operation with clock signals.
• Clear and preset inputs provide additional control over the flip-flop states.
• TTL logic family ensures compatibility with other TTL devices.
• Low propagation delay enables fast data processing.

Advantages and Disadvantages

Advantages

• Dual flip-flop configuration provides flexibility in storing and transferring data.
• Additional clear and preset inputs enhance control over the flip-flop states.
• Fast propagation delay allows for efficient data processing.
• Compatibility with TTL logic family simplifies integration with other TTL devices.

Disadvantages

• Limited number of flip-flops compared to larger ICs.
• Requires external clock signal for proper operation.
• Higher power consumption compared to some alternative models.

Working Principles

The SN74S74DRE4 operates based on the principles of positive-edge-triggered flip-flops. When a positive-edge clock pulse is applied to the CP1 or CP2 input, the data present at the corresponding D1 or D2 input is transferred to the respective Q1 or Q2 output. The clear (CLR) and preset (PR1, PR2) inputs allow for resetting or setting the flip-flop states, respectively.

Detailed Application Field Plans

The SN74S74DRE4 is commonly used in various digital systems where the storage and transfer of binary data is required. Some specific application areas include:

1. Sequential Logic Circuits: The dual flip-flop design makes it suitable for building sequential logic circuits like counters, shift registers, and memory units.
2. Digital Communication Systems: It can be utilized in digital communication systems for data synchronization and buffering purposes.
3. Microcontroller/Processor Interfaces: The SN74S74DRE4 can interface with microcontrollers or processors to store and process data during program execution.
4. Clock Synchronization: It can be employed in clock synchronization circuits to ensure proper timing and synchronization between different components.

Detailed and Complete Alternative Models

• SN74LS74
• SN74HC74
• SN74HCT74
• CD4013BE
• MC74ACT74

These alternative models offer similar functionality and can