SN74AHCT123ADBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator
• Characteristics: High-speed, low-power, monostable multivibrator
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Reliable timing control in digital circuits
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 15 ns (typical)
• Trigger Pulse Width: 20 ns (minimum)

Detailed Pin Configuration

The SN74AHCT123ADBR has a 16-pin configuration as follows:

1. CLR (Clear) - Active LOW input for resetting the multivibrator
2. A - Input for triggering the multivibrator
3. B - Input for triggering the multivibrator
4. GND (Ground) - Ground reference for the IC
5. Q - Output of the multivibrator
6. Q̅ - Complementary output of the multivibrator
7. RCext - External resistor-capacitor timing components connection
8. VCC - Positive supply voltage for the IC
9. NC (No Connection) - No internal connection
10. NC (No Connection) - No internal connection
11. NC (No Connection) - No internal connection
12. NC (No Connection) - No internal connection
13. NC (No Connection) - No internal connection
14. NC (No Connection) - No internal connection
15. NC (No Connection) - No internal connection
16. NC (No Connection) - No internal connection

Functional Features

• Monostable multivibrator with a single-shot pulse output
• Trigger inputs for controlling the timing of the output pulse
• Clear input for resetting the multivibrator to its initial state
• Complementary outputs for flexibility in circuit design
• High-speed operation suitable for digital applications
• Low-power consumption for energy-efficient designs

Advantages and Disadvantages

Advantages: - Reliable timing control in digital circuits - Flexible triggering options - Complementary outputs for versatile circuit design - High-speed operation for time-critical applications - Low-power consumption for energy efficiency

Disadvantages: - Limited functionality compared to more complex multivibrators - Requires external resistor-capacitor components for timing adjustment

Working Principles

The SN74AHCT123ADBR is a monostable multivibrator that generates a single output pulse of a specific duration when triggered. The trigger inputs (A and B) control the timing of the output pulse. Upon receiving a trigger signal, the multivibrator output (Q) transitions to a high state for a predetermined period determined by the external resistor-capacitor (RCext) timing components. After this period, the output returns to its initial state.

The clear input (CLR) allows for resetting the multivibrator to its initial state, terminating the output pulse prematurely if necessary. The complementary output (Q̅) provides an inverted version of the main output (Q), allowing for greater flexibility in circuit design.

Detailed Application Field Plans

The SN74AHCT123ADBR finds application in various fields, including:

1. Timing Control: Provides precise timing control in digital systems, such as microcontrollers, where accurate pulse generation is required.
2. Communication Systems: Used in communication protocols to generate synchronization signals and control timing sequences.
3. Industrial Automation: Enables precise timing in industrial automation systems, such as PLCs (Programmable Logic Controllers), for controlling processes and synchronization.
4. Test and Measurement Equipment: Utilized in test and measurement instruments to generate accurate timing signals for signal analysis and waveform generation.

Detailed and Complete Alternative Models

1. CD74HC123E - High-speed CMOS dual retriggerable monostable multivibrator
2. MC14538B - Dual precision monostable multivibrator with complementary outputs
3. 74LS123 - Dual retriggerable monostable multivibrator with Schmitt-trigger inputs

These alternative models offer similar functionality and can be considered as substitutes for the SN74AHCT123ADBR depending on specific requirements.

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