SN74S74NG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Flip-Flop
• Characteristics: Dual D-Type Positive-Edge-Triggered Flip-Flop
• Package: 14-pin DIP (Dual In-Line Package)
• Essence: Sequential Logic Device
• Packaging/Quantity: Tube, 25 pieces per tube

Specifications

The SN74S74NG4 is a dual D-type positive-edge-triggered flip-flop integrated circuit. It operates on a supply voltage range of 4.5V to 5.5V and has a typical propagation delay of 12 nanoseconds. The flip-flop features complementary outputs, Q and Q̅, which change state on the rising edge of the clock input (CLK). It also includes asynchronous set (SD) and reset (RD) inputs for initializing the flip-flop.

Detailed Pin Configuration

The SN74S74NG4 has a 14-pin DIP package with the following pin configuration:

1. CLK - Clock Input
2. SD - Asynchronous Set Input
3. RD - Asynchronous Reset Input
4. D - Data Input
5. GND - Ground
6. Q̅ - Complementary Output
7. Q - Output
8. VCC - Supply Voltage
9. Q - Output
10. Q̅ - Complementary Output
11. GND - Ground
12. D - Data Input
13. RD - Asynchronous Reset Input
14. SD - Asynchronous Set Input

Functional Features

The SN74S74NG4 is designed to store and transfer data in sequential logic circuits. Its positive-edge-triggered design ensures that changes in the data input are captured and stored only when the clock signal transitions from low to high. The flip-flop can be asynchronously set or reset using the SD and RD inputs, respectively. The complementary outputs provide the inverted and non-inverted versions of the stored data.

Advantages and Disadvantages

Advantages: - Dual flip-flop in a single package saves board space - Positive-edge triggering ensures reliable data capture - Asynchronous set and reset inputs allow for flexible initialization

Disadvantages: - Limited to positive-edge triggering only - Requires external clock signal for operation

Working Principles

The SN74S74NG4 operates based on the principles of sequential logic. When the clock input transitions from low to high, the data input is captured and stored in the flip-flop. The stored data is then available at the Q and Q̅ outputs. The asynchronous set and reset inputs allow for immediate changes in the stored data, regardless of the clock state.

Detailed Application Field Plans

The SN74S74NG4 is commonly used in various digital systems where sequential logic is required. Some application fields include:

1. Digital Counters: The flip-flop can be used as a building block for designing synchronous or asynchronous counters.
2. State Machines: Sequential circuits that require memory elements, such as finite state machines, can utilize the SN74S74NG4 for storing and transferring states.
3. Data Storage: The flip-flop can be employed in memory units to store temporary or intermediate data during processing.

Detailed and Complete Alternative Models

1. SN74LS74N: Similar dual D-type positive-edge-triggered flip-flop with a wider supply voltage range (2V to 6V).
2. CD4013BE: Dual D-type flip-flop with both positive-edge and negative-edge triggering options.
3. MC74HC74AN: Dual D-type flip-flop with higher speed performance and a wider operating temperature range.

These alternative models offer similar functionality to the SN74S74NG4 and can be considered as replacements based on specific requirements.

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