Encyclopedia Entry: 74AC109SJX

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic Flip-Flop
• Characteristics: Dual Positive Edge-Triggered JK Flip-Flop with Clear and Preset
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: This IC is designed to store and manipulate digital information using flip-flop logic gates.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: Advanced CMOS (AC)
• Number of Flip-Flops: 2
• Trigger Type: Positive Edge-Triggered
• Flip-Flop Type: JK Flip-Flop
• Clear and Preset Inputs: Yes
• Propagation Delay: 5.5 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 74AC109SJX IC has a total of 16 pins, which are assigned specific functions as follows:

1. Pin 1: Clear (CLR) Input for Flip-Flop A
2. Pin 2: Clock (CLK) Input for Flip-Flop A
3. Pin 3: J Input for Flip-Flop A
4. Pin 4: K Input for Flip-Flop A
5. Pin 5: Preset (PRE) Input for Flip-Flop A
6. Pin 6: Q Output for Flip-Flop A
7. Pin 7: Q̅ Output for Flip-Flop A
8. Pin 8: Ground (GND)
9. Pin 9: Q̅ Output for Flip-Flop B
10. Pin 10: Q Output for Flip-Flop B
11. Pin 11: Preset (PRE) Input for Flip-Flop B
12. Pin 12: K Input for Flip-Flop B
13. Pin 13: J Input for Flip-Flop B
14. Pin 14: Clock (CLK) Input for Flip-Flop B
15. Pin 15: Clear (CLR) Input for Flip-Flop B
16. Pin 16: VCC (+2V to +6V) Supply Voltage

Functional Features

• Dual flip-flop design allows independent storage and manipulation of two separate digital signals.
• Positive edge-triggered operation ensures reliable and synchronized data capture.
• JK flip-flop configuration provides versatile functionality for various digital logic applications.
• Clear and preset inputs allow for controlled initialization of the flip-flops.
• Wide supply voltage range enables compatibility with different power sources.
• Low propagation delay ensures fast and efficient signal processing.

Advantages and Disadvantages

Advantages: - Dual flip-flop design increases flexibility in digital circuit design. - Positive edge-triggered operation ensures reliable data capture. - Versatile JK flip-flop configuration supports a wide range of applications. - Clear and preset inputs enable controlled initialization. - Wide supply voltage range enhances compatibility.

Disadvantages: - Limited number of flip-flops per IC may restrict complex circuit designs. - Propagation delay may impact timing-sensitive applications. - Requires careful consideration of clock synchronization in multi-flip-flop systems.

Working Principles

The 74AC109SJX operates based on the principles of flip-flop logic. Each flip-flop within the IC can store one bit of digital information, represented by the states of its J and K inputs. The positive edge-triggered design ensures that the stored information is updated only when a rising edge is detected on the clock input.

The J and K inputs determine the behavior of the flip-flop. When both inputs are low (0), the flip-flop maintains its current state. When J is high (1) and K is low (0), the flip-flop transitions to a set state (Q = 1). Conversely, when J is low (0) and K is high (1), the flip-flop transitions to a reset state (Q = 0). When both J and K are high (1), the flip-flop toggles between its set and reset states on each clock edge.

The clear and preset inputs allow for controlled initialization of the flip-flops. The clear input forces both flip-flops to their reset state, while the preset input sets them to their set state. These inputs are typically used during system startup or when a specific initial state is required.

Detailed Application Field Plans

The 74AC109SJX IC finds applications in various digital systems where the storage and manipulation of binary information is necessary. Some common application fields include:

1. Digital Counters: The dual flip-flop design makes it suitable for constructing synchronous counters used in frequency dividers, timers, and event