DM74ALS74ASJ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: High-speed, TTL Logic
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Dual D-Type Positive-Edge-Triggered Flip-Flop
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 4.5V to 5.5V
• Logic Family: Advanced Low-Power Schottky (ALS)
• Number of Flip-Flops: 2
• Trigger Type: Positive-Edge
• Clock Frequency: Up to 100MHz
• Propagation Delay: 8ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The DM74ALS74ASJ has a total of 14 pins, each serving a specific function:

1. CLR (Clear) - Active LOW input for resetting the flip-flop.
2. D1 (Data Input 1) - Input for the first flip-flop.
3. CLK (Clock) - Input for the clock signal.
4. D2 (Data Input 2) - Input for the second 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. Q2 (Output 2) - Output of the second flip-flop.
9. Q̅2 (Complementary Output 2) - Complementary output of the second flip-flop.
10. PRE (Preset) - Active LOW input for setting the flip-flop.
11. PR̅E (Complementary Preset) - Complementary input for setting the flip-flop.
12. VCC (Supply Voltage) - Positive power supply for the IC.
13. SET (Set) - Active LOW input for setting the flip-flop.
14. S̅ET (Complementary Set) - Complementary input for setting the flip-flop.

Functional Features

• Dual D-Type Flip-Flop: The DM74ALS74ASJ consists of two independent D-type flip-flops, allowing for simultaneous operation or separate usage.
• Positive-Edge Triggered: The flip-flops are triggered on the rising edge of the clock signal, ensuring accurate data capture.
• High-Speed Operation: With a clock frequency of up to 100MHz and a propagation delay of only 8ns, this IC is suitable for high-speed applications.
• TTL Logic: The IC operates on TTL logic levels, making it compatible with other TTL devices.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data processing.
• Dual flip-flop configuration provides flexibility in circuit design.
• Compatibility with TTL logic allows integration with existing systems.

Disadvantages

• Limited voltage supply range (4.5V to 5.5V).
• Not suitable for low-power applications due to higher power consumption compared to CMOS alternatives.

Working Principles

The DM74ALS74ASJ is a positive-edge-triggered flip-flop that stores data based on the rising edge of the clock signal. When the clock signal transitions from LOW to HIGH, the data present at the D1 and D2 inputs is captured and stored in the respective flip-flops. The stored data is then available at the Q1, Q̅1, Q2, and Q̅2 outputs until the next clock transition occurs.

The flip-flop can be reset using the CLR input, which sets the outputs to a known state. Similarly, the PRE and SET inputs allow for setting the flip-flop to specific states.

Detailed Application Field Plans

The DM74ALS74ASJ is commonly used in various digital systems where the storage and synchronization of data are required. Some application fields include:

1. Digital Communication Systems: Used for data buffering and synchronization in communication protocols such as UART (Universal Asynchronous Receiver-Transmitter) and SPI (Serial Peripheral Interface).
2. Microprocessor Systems: Employed in address decoding circuits, register banks, and control units.
3. Data Storage Systems: Integrated into memory modules, cache controllers, and data registers.
4. Timing and Control Circuits: Utilized for clock synchronization, event triggering, and state machine implementation.

Alternative Models

For similar functionality and compatibility, the following alternative models can be considered:

1. SN74LS74A: Dual D-Type Positive-Edge-Triggered Flip-Flop from Texas Instruments.
2. MC74HC74A: Dual D-Type Flip-Flop with Set and Reset from ON Semiconductor.