SN74AHC123AD

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics:
  • High-Speed CMOS Logic
  • Wide Operating Voltage Range: 2 V to 5.5 V
  • Schmitt-Trigger Inputs for Noise Immunity
  • Monostable Operation with External Capacitor
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The SN74AHC123AD is a dual retriggerable monostable multivibrator designed using high-speed CMOS technology.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 6 ns (typical)
• Output Current: ±8 mA
• Input Capacitance: 3.5 pF (typical)

Detailed Pin Configuration

The SN74AHC123AD has a total of 16 pins, which are assigned as follows:

1. CLR (Clear) - Active LOW input pin
2. A - Input pin for triggering the monostable operation
3. B - Input pin for triggering the monostable operation
4. GND (Ground) - Ground reference pin
5. Y - Output pin
6. VCC - Positive power supply pin
7. B - Input pin for triggering the monostable operation
8. A - Input pin for triggering the monostable operation
9. NC (No Connection) - Not connected pin
10. NC (No Connection) - Not connected pin
11. NC (No Connection) - Not connected pin
12. NC (No Connection) - Not connected pin
13. NC (No Connection) - Not connected pin
14. NC (No Connection) - Not connected pin
15. NC (No Connection) - Not connected pin
16. NC (No Connection) - Not connected pin

Functional Features

• Retriggerable Monostable Operation: The SN74AHC123AD can be triggered multiple times before the output returns to its stable state.
• Schmitt-Trigger Inputs: Provides noise immunity and ensures reliable operation in noisy environments.
• Wide Operating Voltage Range: Allows compatibility with various power supply voltages.
• High-Speed CMOS Logic: Enables fast switching and reduces propagation delay.

Advantages and Disadvantages

Advantages: - Retriggerable operation allows flexibility in timing applications. - Noise immunity provided by Schmitt-trigger inputs enhances reliability. - Wide operating voltage range enables compatibility with different systems.

Disadvantages: - Limited output current may restrict use in high-current applications. - Input capacitance may affect performance in high-frequency applications.

Working Principles

The SN74AHC123AD is a retriggerable monostable multivibrator that generates a pulse of a fixed duration when triggered. It operates based on the charging and discharging of an external capacitor connected to the timing resistor. When triggered, the output goes high for a specific time period determined by the RC time constant. The monostable operation can be retriggered before the output returns to its stable state.

Detailed Application Field Plans

The SN74AHC123AD finds applications in various fields, including:

1. Timing Applications: Used to generate precise time delays in digital circuits.
2. Pulse Shaping: Utilized to create well-defined pulses for triggering other devices.
3. Frequency Division: Employed in frequency division circuits to divide input frequencies.
4. Control Systems: Integrated into control systems to provide timing signals for synchronization.

Detailed and Complete Alternative Models

1. CD74HC123: Similar dual retriggerable monostable multivibrator with a wider operating voltage range.
2. MC74VHC123A: Dual retriggerable monostable multivibrator with higher output current capability.
3. SN74LVC123A: Low-voltage dual retriggerable monostable multivibrator with reduced power consumption.

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