Encyclopedia Entry: 74AC109SCX

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual Positive Edge-Triggered JK Flip-Flop with Clear and Preset
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The 74AC109SCX is a versatile flip-flop IC that can store and manipulate binary information. It is commonly used in digital electronics for various applications.
• Packaging/Quantity: The 74AC109SCX is typically sold in reels or tubes, containing multiple units per package.

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: Advanced CMOS (AC)
• Number of Flip-Flops: 2
• Trigger Type: Positive Edge-Triggered
• Inputs: J, K, Clock (CLK), Clear (CLR), Preset (PR)
• Outputs: Q, Q̅
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 74AC109SCX 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 presetting the flip-flop.
3. CLK (Clock) - Input for triggering the flip-flop on the positive edge.
4. J (Data Input J) - Input for setting the value of the flip-flop output.
5. K (Data Input K) - Input for resetting the value of the flip-flop output.
6. GND (Ground) - Ground reference for the IC.
7. Q̅ (Complementary Output Q) - Complementary output of the flip-flop.
8. Q (Output Q) - Output of the flip-flop. 9-16. VCC (Supply Voltage) - Positive power supply for the IC.

Functional Features

• Dual Flip-Flop: The 74AC109SCX contains two independent JK flip-flops in a single package, allowing for efficient use of space and resources.
• Clear and Preset Inputs: The presence of clear (CLR) and preset (PR) inputs enables the initialization of the flip-flop to specific states, enhancing flexibility in digital circuit design.
• Positive Edge-Triggered: The flip-flop is triggered on the positive edge of the clock signal (CLK), ensuring precise timing control.
• Wide Operating Voltage Range: The IC can operate within a voltage range of 2V to 6V, making it compatible with various digital systems.

Advantages and Disadvantages

Advantages: - Compact and integrated design saves board space. - Clear and preset inputs provide flexibility in circuit design. - Wide operating voltage range allows compatibility with different systems. - Positive edge-triggering ensures accurate timing control.

Disadvantages: - Limited number of flip-flops per IC package. - Requires external components for complete functionality. - Sensitive to electrostatic discharge (ESD) and proper handling precautions are necessary.

Working Principles

The 74AC109SCX operates based on the principles of JK flip-flops. It stores binary information using the J and K inputs and updates the output state based on the clock signal. When the clock signal transitions from LOW to HIGH (positive edge), the flip-flop evaluates the J and K inputs and modifies the output accordingly. The clear (CLR) and preset (PR) inputs allow for additional control over the initial state of the flip-flop.

Detailed Application Field Plans

The 74AC109SCX finds applications in various digital systems, including but not limited to: - Counters and frequency dividers - Shift registers - Data storage and retrieval circuits - State machines and sequencers - Control and timing circuits

Detailed and Complete Alternative Models

• 74HC109: Similar functionality, but operates at a lower voltage range (2V to 6V).
• CD4013: Dual D-type flip-flop with similar characteristics.
• SN74LS109: Dual JK flip-flop with clear and preset inputs.

These alternative models offer comparable features and can be used as substitutes for the 74AC109SCX in different applications.

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