SN74ALS74AN

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)
• Essence: The SN74ALS74AN is a dual D-type flip-flop IC that operates on positive-edge triggering. It is widely used in digital circuits for storing and transferring data.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 9 ns (typical)
• Input Capacitance: 3 pF (typical)
• Output Current: ±8 mA
• Logic Family: ALS (Advanced Low-Power Schottky)

Pin Configuration

The SN74ALS74AN has a total of 14 pins, which are assigned specific functions as follows:

1. CLR (Clear) - Clear input
2. D1 (Data Input 1) - Data input for the first flip-flop
3. CLK (Clock) - Clock input
4. D2 (Data Input 2) - Data input for the second flip-flop
5. Q1 (Flip-Flop 1 Output) - Output of the first flip-flop
6. Q1̅ (Complementary Output of Flip-Flop 1) - Complementary output of the first flip-flop
7. GND (Ground) - Ground reference
8. Q2 (Flip-Flop 2 Output) - Output of the second flip-flop
9. Q2̅ (Complementary Output of Flip-Flop 2) - Complementary output of the second flip-flop
10. PRE (Preset) - Preset input
11. PR̅E (Complementary Preset) - Complementary preset input
12. CLR̅ (Complementary Clear) - Complementary clear input
13. VCC (Positive Power Supply) - Positive power supply
14. NC (No Connection) - No connection

Functional Features

• Dual flip-flop design allows for independent operation of two separate data inputs.
• Positive-edge triggering ensures reliable and synchronized data transfer.
• Clear and preset inputs provide additional control over the flip-flop states.
• Complementary outputs facilitate versatile circuit designs.

Advantages and Disadvantages

Advantages

• High-speed operation with low propagation delay time.
• Wide operating temperature range enables usage in various environments.
• Versatile functionality due to dual flip-flop design.
• Low power consumption thanks to the ALS logic family.

Disadvantages

• Limited output current may restrict certain applications.
• PDIP-14 package may not be suitable for space-constrained designs.
• Lack of internal feedback loop limits advanced sequential operations.

Working Principles

The SN74ALS74AN operates based on positive-edge triggering, meaning that the flip-flops change their output states only when a rising edge is detected at the clock input. The data inputs are sampled and stored during this rising edge, allowing for synchronized data transfer. The clear and preset inputs provide additional control over the flip-flop states, enabling initialization or forced output conditions.

Detailed Application Field Plans

The SN74ALS74AN finds extensive use in digital systems where data storage and transfer are required. Some specific application areas include:

1. Sequential Logic Circuits: Used as building blocks for counters, shift registers, and other sequential circuits.
2. Digital Communication Systems: Employed in data synchronization and buffering circuits.
3. Microprocessor Interfacing: Facilitates data transfer between microprocessors and peripheral devices.
4. Clock Synchronization: Ensures synchronized operation of multiple digital components.

Detailed and Complete Alternative Models

1. SN74ALS74AD - SOIC-14 (Small Outline Integrated Circuit) package variant.
2. SN74LS74AN - Similar functionality but operates on negative-edge triggering.
3. CD4013BE - CMOS-based dual D-type flip-flop with similar characteristics.

In conclusion, the SN74ALS74AN is a versatile dual D-type flip-flop IC that offers reliable data storage and transfer capabilities. Its positive-edge triggering, clear/preset inputs, and complementary outputs make it suitable for various digital applications. While it has limitations in terms of output current and package options, alternative models provide flexibility to meet specific design requirements.