SN74LS112AD

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual J-K Negative-Edge-Triggered Flip-Flop with Clear and Preset
• Package: 16-pin DIP (Dual In-line Package)
• Essence: The SN74LS112AD is a dual J-K negative-edge-triggered flip-flop with clear and preset functions. It is widely used in digital electronics for storing and manipulating binary data.
• Packaging/Quantity: Available in tubes or reels, with quantities varying depending on the supplier.

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• High-Level Input Voltage: 2V (min)
• Low-Level Input Voltage: 0.8V (max)
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Operating Temperature Range: -40°C to 85°C
• Propagation Delay Time: 30ns (typical)

Detailed Pin Configuration

The SN74LS112AD has a total of 16 pins, each serving a specific function:

1. CLR (Clear) - Active low input for clearing the flip-flop.
2. PR (Preset) - Active low input for setting the flip-flop.
3. CP (Clock Pulse) - Negative-edge-triggered clock input.
4. J (J Input) - Input for J logic level.
5. K (K Input) - Input for K logic level.
6. Q1 (Output Q1) - First output of the flip-flop.
7. Q1̅ (Complementary Output Q1) - Complementary output of Q1.
8. GND (Ground) - Ground reference for the IC.
9. Q2 (Output Q2) - Second output of the flip-flop.
10. Q2̅ (Complementary Output Q2) - Complementary output of Q2.
11. VCC (Positive Power Supply) - Positive power supply for the IC. 12-15. NC (No Connection) - These pins are not connected and serve no function.
12. CLR̅ (Complementary Clear) - Complementary output of CLR.

Functional Features

The SN74LS112AD is a versatile flip-flop with the following functional features:

• Dual J-K Flip-Flop: It contains two independent J-K flip-flops in a single package, allowing for simultaneous operation or separate use.
• Negative-Edge-Triggered: The flip-flop responds to the falling edge of the clock pulse, ensuring accurate timing and synchronization.
• Clear and Preset Functions: The clear and preset inputs allow for easy initialization and control of the flip-flop's state.
• Complementary Outputs: The complementary outputs provide both the true and inverted versions of the stored data.

Advantages and Disadvantages

Advantages: - Dual flip-flop configuration saves space and cost compared to using two individual flip-flops. - Negative-edge triggering ensures reliable operation in various digital systems. - Clear and preset functions offer flexibility in controlling the flip-flop's initial state.

Disadvantages: - Limited voltage range may restrict compatibility with certain systems. - Propagation delay time may affect the overall performance in high-speed applications.

Working Principles

The SN74LS112AD operates based on the principles of J-K flip-flops. When the clock pulse transitions from high to low (falling edge), the inputs J and K are sampled, and the outputs Q1 and Q2 change accordingly. The clear (CLR) and preset (PR) inputs allow for forced states, overriding the normal operation. The complementary outputs (Q1̅ and Q2̅) provide inverted versions of the true outputs (Q1 and Q2).

Detailed Application Field Plans

The SN74LS112AD finds applications in various digital systems, including but not limited to:

1. Counters and Registers: It can be used as a building block for designing synchronous counters and registers.
2. State Machines: The flip-flop's ability to store binary states makes it suitable for implementing state machines in control systems.
3. Data Storage: It can be utilized for temporary storage of data in microprocessors and microcontrollers.
4. Clock Synchronization: The negative-edge triggering ensures accurate synchronization of multiple flip-flops in clocked systems.

Detailed and Complete Alternative Models

There are several alternative models available that serve similar functions to the SN74LS112AD. Some notable alternatives include:

• CD4027: Dual J-K Master-Slave Flip-Flop with Set and Reset
• MC14027B: Quad J-K Flip-Flop with Set and Reset
• 74HC112: Dual J-K Negative-Edge-Triggered Flip-Flop with Clear

These alternatives offer similar functionality but