SN74AHCT123AD

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed, low-power, Schmitt-trigger inputs
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 10 ns
• Trigger Pulse Width Range: 30 ns to 1000 ns

Detailed Pin Configuration

The SN74AHCT123AD has a total of 16 pins, which are labeled as follows:

1. CLR (Clear) - Active LOW clear input
2. A (Trigger) - Trigger input
3. B (Threshold) - Threshold input
4. RCext (External Resistor/Capacitor) - External resistor/capacitor connection
5. GND (Ground) - Ground reference
6. Q (Output) - Output
7. Q̅ (Complementary Output) - Complementary output
8. VCC (Supply Voltage) - Positive supply voltage

Pins 9 to 16 are not used in this particular model.

Functional Features

• Retriggerable operation allows for extending the output pulse width
• Schmitt-trigger inputs provide hysteresis and improve noise immunity
• Can be used as a monostable multivibrator or a free-running oscillator
• Wide operating voltage range enables compatibility with various systems
• Low power consumption makes it suitable for battery-powered devices

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Schmitt-trigger inputs for noise immunity - Retriggerable functionality

Disadvantages: - Limited trigger pulse width range - Only available in SOIC package

Working Principles

The SN74AHCT123AD is a dual retriggerable monostable multivibrator. It can be triggered by a negative pulse on the Trigger (A) input, which starts the output pulse. The duration of the output pulse is determined by the external resistor and capacitor connected to the RCext pin. If another trigger pulse occurs during the output pulse, the timing is extended, allowing for retriggering.

Detailed Application Field Plans

The SN74AHCT123AD is commonly used in various applications, including:

1. Timing circuits: It can be used to generate precise time delays in applications such as timers, clocks, and synchronization circuits.
2. Pulse shaping: The retriggerable feature makes it suitable for pulse stretching or pulse narrowing applications.
3. Control systems: It can be utilized in control systems that require accurate timing and synchronization between different components.
4. Communication systems: The high-speed operation and noise immunity make it useful in communication circuits for signal conditioning and synchronization purposes.

Detailed and Complete Alternative Models

1. CD74HC123E: Similar dual retriggerable monostable multivibrator with 16-pin DIP (Dual Inline Package) packaging.
2. MC74VHC123ADR2G: Dual retriggerable monostable multivibrator with Schmitt-trigger inputs and 16-pin SOIC packaging.
3. SN74LVC123ADGVR: Dual retriggerable monostable multivibrator with low-voltage compatibility and 16-pin TSSOP (Thin Shrink Small Outline Package) packaging.

These alternative models offer similar functionality and can be considered as substitutes for the SN74AHCT123AD.

In conclusion, the SN74AHCT123AD is a high-speed, low-power dual retriggerable monostable multivibrator. Its Schmitt-trigger inputs and wide operating voltage range make it suitable for various timing and synchronization applications. While it has some limitations, such as a limited trigger pulse width range, it offers several advantages, including retriggerable operation and noise immunity.