SN74LS74AD

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual D-Type Positive-Edge-Triggered Flip-Flop
• Package: 14-Pin Plastic Dual In-Line Package (PDIP)
• Essence: Sequential Logic Device
• Packaging/Quantity: Tape and Reel, 2000 units per reel

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• High-Level Input Voltage: 2V (min), 7V (max)
• Low-Level Input Voltage: 0.8V (min), 0.8V (max)
• High-Level Output Voltage: 2.7V (min), VCC (max)
• Low-Level Output Voltage: 0.5V (min), 0.35V (max)
• Maximum Operating Frequency: 33 MHz

Detailed Pin Configuration

1. CLR (Clear) - Active LOW input
2. D (Data) - Data input
3. CLK (Clock) - Clock input
4. PR (Preset) - Active LOW input
5. Q (Output) - Complementary output
6. Q̅ (Output) - Complementary output
7. GND (Ground) - Ground reference
8. Q̅ (Output) - Complementary output
9. Q (Output) - Complementary output
10. VCC (Supply Voltage) - Positive power supply
11. D (Data) - Data input
12. CLK (Clock) - Clock input
13. PR (Preset) - Active LOW input
14. CLR (Clear) - Active LOW input

Functional Features

• Dual D-type positive-edge-triggered flip-flop
• Direct clear and preset inputs for each flip-flop
• Outputs can drive up to 10 LS-TTL loads
• High-speed operation with a maximum frequency of 33 MHz
• Wide supply voltage range for compatibility with various systems

Advantages and Disadvantages

Advantages

• Dual flip-flop in a single package saves board space
• Direct clear and preset inputs provide flexibility in controlling the flip-flop state
• High-speed operation allows for efficient data processing
• Wide supply voltage range enhances compatibility with different power systems

Disadvantages

• Limited output drive capability compared to some other ICs
• Not suitable for applications requiring very high frequencies

Working Principles

The SN74LS74AD is a dual D-type positive-edge-triggered flip-flop. It stores one bit of data and transfers it to the output on the rising edge of the clock signal. The flip-flop can be cleared or preset using the CLR and PR inputs, respectively. The complementary outputs Q and Q̅ provide the inverted and non-inverted versions of the stored data.

Detailed Application Field Plans

The SN74LS74AD is commonly used in digital systems where sequential logic is required. Some application areas include:

1. Counters and Registers: The flip-flop can be used as building blocks for counters and registers in microprocessors and digital signal processors.
2. State Machines: Sequential circuits like finite state machines can be implemented using multiple flip-flops interconnected to represent different states and transitions.
3. Data Storage: The flip-flop can store data temporarily in memory elements like shift registers and buffers.
4. Clock Synchronization: The flip-flop can be used to synchronize signals with different clock domains in digital communication systems.

Detailed and Complete Alternative Models

Some alternative models to SN74LS74AD that serve similar functions are:

1. CD4013BCN: CMOS Dual D-Type Flip-Flop
2. MC74HC74AN: High-Speed CMOS Dual D-Type Flip-Flop
3. 74F74PC: Dual D-Type Positive-Edge-Triggered Flip-Flop

These alternatives offer similar functionality but may have different specifications and pin configurations.

Word count: 443 words