Encyclopedia Entry: 74AC74SJX

Product Overview

Category

The 74AC74SJX belongs to the category of integrated circuits (ICs) and specifically falls under the family of flip-flops.

Use

This product is primarily used in digital electronics for storing and manipulating binary data. It serves as a fundamental building block in various applications such as counters, registers, and memory units.

Characteristics

• The 74AC74SJX is a dual D-type positive-edge-triggered flip-flop.
• It operates on a wide supply voltage range, typically between 2V and 6V.
• This IC offers high-speed performance with low power consumption.
• It features a compact package size, making it suitable for space-constrained designs.

Package and Quantity

The 74AC74SJX is available in a small outline integrated circuit (SOIC) package. Each package contains one unit of the IC.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to Vcc
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: Vcc - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Operating Frequency: 100 MHz

Pin Configuration

The 74AC74SJX has a total of 14 pins, each serving a specific function. The pin configuration is as follows:

1. CLR (Clear)
2. D1 (Data Input 1)
3. CLK (Clock Input)
4. D2 (Data Input 2)
5. Q1 (Flip-Flop 1 Output)
6. Q1̅ (Complementary Output of Flip-Flop 1)
7. GND (Ground)
8. Q2 (Flip-Flop 2 Output)
9. Q2̅ (Complementary Output of Flip-Flop 2)
10. PRE (Preset)
11. PR̅E (Complementary Input of Preset)
12. Vcc (Supply Voltage)
13. NC (No Connection)
14. NC (No Connection)

Functional Features

• Positive-edge-triggered operation: The flip-flops store data on the rising edge of the clock signal.
• Dual D-type design: It consists of two independent flip-flops within a single IC package.
• Clear and preset inputs: The CLR and PRE pins allow for resetting or setting the flip-flop outputs to specific states.
• Complementary outputs: Each flip-flop provides both the normal and inverted output signals.

Advantages and Disadvantages

Advantages: - High-speed performance enables efficient data processing. - Wide supply voltage range allows for compatibility with various systems. - Compact package size facilitates integration into space-limited designs.

Disadvantages: - Limited number of flip-flops per IC, which may require multiple units for complex applications. - Not suitable for applications requiring very low power consumption.

Working Principles

The 74AC74SJX operates based on the principles of sequential logic. When the clock input receives a rising edge, the data present at the D1 and D2 inputs is transferred to the respective flip-flops. The outputs (Q1, Q1̅, Q2, Q2̅) reflect the stored data until the next clock transition occurs. The CLR and PRE inputs provide additional control over the flip-flop states.

Application Field Plans

The 74AC74SJX finds extensive use in various digital systems, including but not limited to: - Counters and frequency dividers - Shift registers - Memory units - Data storage and retrieval systems - Control circuits

Alternative Models

For similar functionality, the following alternative models can be considered: - 74HC74: High-speed CMOS logic family - CD4013: Dual D-type flip-flop IC - SN74LS74: Low-power Schottky TTL flip-flop

These alternatives offer comparable features and can be used as substitutes depending on specific design requirements.

In conclusion, the 74AC74SJX is a dual D-type positive-edge-triggered flip-flop integrated circuit. Its high-speed performance, wide supply voltage range, and compact package make it suitable for various digital applications. However, designers should consider alternative models based on their specific needs.