SN74LS423N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gates
• Characteristics: TTL (Transistor-Transistor Logic) technology, Dual Retriggerable Monostable Multivibrator
• Package: DIP (Dual In-line Package)
• Essence: High-speed digital logic IC used for timing and synchronization applications
• Packaging/Quantity: Available in tubes or reels, typically sold in quantities of 25 or 50 units

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: 0°C to 70°C
• Propagation Delay Time: 15 ns
• Trigger Pulse Width: 30 ns to 100 ns
• Output Current: ±8 mA
• Input Capacitance: 10 pF
• Power Dissipation: 500 mW

Detailed Pin Configuration

The SN74LS423N has a 16-pin DIP package with the following pin configuration:

1. CLR - Clear Input
2. A - Data Input A
3. B - Data Input B
4. C - Data Input C
5. D - Data Input D
6. GND - Ground
7. Q - Output
8. VCC - Positive Power Supply
9. REXT - External Resistor Connection
10. RB - Reset B Input
11. RC - Reset C Input
12. RD - Reset D Input
13. RE - Reset E Input
14. TRIG - Trigger Input
15. RETRIG - Retrigger Input
16. VCC - Positive Power Supply

Functional Features

• Dual Retriggerable Monostable Multivibrator: Provides two independent monostable multivibrators in a single IC.
• Retriggerable Operation: Allows the output pulse width to be extended by applying additional trigger pulses.
• Clear Input: Resets the multivibrator and forces the output to a low state.
• Trigger and Retrigger Inputs: Control the timing of the output pulse.
• Reset Inputs: Allow external control over the multivibrator's operation.

Advantages and Disadvantages

Advantages: - High-speed operation suitable for timing and synchronization applications. - Retriggerable feature provides flexibility in pulse width control. - Compact design with multiple functions integrated into a single IC.

Disadvantages: - Limited supply voltage range (4.75V to 5.25V). - Operating temperature range may not be suitable for extreme environments. - Output current limited to ±8 mA, which may restrict certain applications.

Working Principles

The SN74LS423N operates as a dual retriggerable monostable multivibrator. It generates an output pulse of a specific duration when triggered by an input signal. The pulse width can be extended by applying additional trigger pulses before the output pulse ends. The clear input resets the multivibrator, forcing the output to a low state. The reset inputs provide external control over the multivibrator's operation.

Detailed Application Field Plans

The SN74LS423N finds application in various fields, including:

1. Timing and Synchronization Systems: Used to generate precise time intervals and synchronize different components in electronic systems.
2. Pulse Width Modulation (PWM): Enables control over the width of output pulses in applications such as motor speed control and power converters.
3. Communication Systems: Provides timing and synchronization capabilities in data transmission and reception circuits.
4. Industrial Automation: Used for timing and sequencing operations in control systems.
5. Test and Measurement Equipment: Utilized for generating accurate timing signals in oscilloscopes, function generators, and other test instruments.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74LS423N include:

1. CD4538: Dual Precision Monostable Multivibrator IC
2. MC14538: Dual Precision Retriggerable/Resettable Monostable Multivibrator IC
3. 74HC123: Dual Retriggerable Monostable Multivibrator with Schmitt-Trigger Inputs

These alternative models can be considered based on specific requirements and availability.

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