SN74AS74AN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual D-Type Positive-Edge-Triggered Flip-Flop
• Package: PDIP-14 (Plastic Dual-In-Line Package with 14 pins)
• Essence: The SN74AS74AN is a dual flip-flop IC that can store and transfer binary data.
• Packaging/Quantity: Typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• High-Level Input Voltage: 2.0V (min), 7.0V (max)
• Low-Level Input Voltage: -0.5V (min), 0.8V (max)
• High-Level Output Voltage: 2.4V (min), VCC (max)
• Low-Level Output Voltage: 0V (min), 0.4V (max)
• Maximum Operating Frequency: 100MHz

Detailed Pin Configuration

The SN74AS74AN has a total of 14 pins, which are assigned specific functions as follows:

1. CLR (Clear) - Active LOW input for clearing the flip-flop.
2. D1 (Data Input 1) - Data input for the first flip-flop.
3. CLK (Clock) - Input for clock signal triggering the flip-flop.
4. D2 (Data Input 2) - Data input for the second flip-flop.
5. Q1 (Output 1) - Output of the first flip-flop.
6. Q1' (Complementary Output 1) - Complementary output of the first flip-flop.
7. GND (Ground) - Ground reference for the IC.
8. Q2' (Complementary Output 2) - Complementary output of the second flip-flop.
9. Q2 (Output 2) - Output of the second flip-flop.
10. PRE (Preset) - Active LOW input for presetting the flip-flop.
11. PRD (Preset Disable) - Active HIGH input for disabling the preset function.
12. CLR' (Complementary Clear) - Complementary output of the clear input.
13. VCC (Positive Power Supply) - Positive power supply for the IC.
14. PRD' (Complementary Preset Disable) - Complementary output of the preset disable input.

Functional Features

• Dual D-Type Flip-Flop: The SN74AS74AN consists of two independent D-type flip-flops, allowing for simultaneous storage and transfer of data.
• Positive-Edge Triggered: The flip-flop triggers on the rising edge of the clock signal, ensuring accurate data capture.
• Asynchronous Clear and Preset: The IC provides inputs for clearing and presetting the flip-flop asynchronously, allowing for flexible control.
• Complementary Outputs: The complementary outputs provide inverted versions of the main outputs, enabling versatile logic operations.

Advantages and Disadvantages

Advantages: - Dual flip-flop design allows for efficient use of space and resources. - Positive-edge triggering ensures reliable data capture. - Asynchronous clear and preset inputs offer flexibility in controlling the flip-flop's state. - Complementary outputs enable a wider range of logic operations.

Disadvantages: - Limited operating frequency compared to more advanced flip-flop designs. - Requires external components for proper functioning, such as clock signal source.

Working Principles

The SN74AS74AN operates based on the principles of sequential logic. It uses positive-edge triggering to latch and store data at the rising edge of the clock signal. The stored data can then be transferred to the outputs upon receiving a clock pulse. The asynchronous clear and preset inputs allow for immediate resetting or setting of the flip-flop's state, regardless of the clock signal.

Detailed Application Field Plans

The SN74AS74AN is commonly used in various digital systems and applications, including:

1. Counters and Registers: The dual flip-flop design makes it suitable for building counters and registers that require multiple storage elements.
2. Data Synchronization: It can be used to synchronize data between different parts of a system, ensuring proper timing and avoiding data corruption.
3. State Machines: The flip-flop can be utilized in designing state machines, where sequential logic is required to control system behavior based on specific conditions.
4. Clock Division: By utilizing one of the flip-flops as a divide-by-two circuit, the IC can generate lower-frequency clock signals from a higher-frequency input.

Detailed and Complete Alternative Models

• SN7474: Dual D-Type Positive-Edge-Triggered Flip-Flop with Preset and Clear
• CD4013B: CMOS Dual D-Type Flip-Flop
• MC74HC74A: High-Speed CMOS Logic Dual D-Type Flip-Flop