SN74AHC123AN

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Timer Applications
• Characteristics: Dual Retriggerable Monostable Multivibrator with Clear and Complementary Outputs
• Package: 16-Pin PDIP (Plastic Dual In-Line Package)
• Essence: The SN74AHC123AN is a dual retriggerable monostable multivibrator designed for use in various timing applications.
• Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 units.

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 6 ns (typical)
• Trigger Pulse Width: 30 ns (minimum)
• Output Current: ±8 mA
• Input Capacitance: 3 pF (typical)

Detailed Pin Configuration

The SN74AHC123AN has a total of 16 pins, which are assigned specific functions as follows:

1. CLR (Clear) - Active LOW input used to reset the multivibrator.
2. A - Input used to trigger the multivibrator.
3. B - Input used to trigger the multivibrator.
4. RCext (External Resistor-Capacitor) - External resistor-capacitor connection for timing control.
5. Cext (External Capacitor) - External capacitor connection for timing control.
6. Rext (External Resistor) - External resistor connection for timing control.
7. Qa (Complementary Output A) - Complementary output of multivibrator A.
8. Qb (Complementary Output B) - Complementary output of multivibrator B.
9. GND (Ground) - Ground reference for the IC.
10. Qa (Output A) - Output of multivibrator A.
11. Qb (Output B) - Output of multivibrator B.
12. VCC (Supply Voltage) - Positive supply voltage connection for the IC.
13. NC (No Connection) - Pin left unconnected.
14. NC (No Connection) - Pin left unconnected.
15. NC (No Connection) - Pin left unconnected.
16. NC (No Connection) - Pin left unconnected.

Functional Features

• Dual retriggerable monostable multivibrator with clear and complementary outputs.
• Retriggerable functionality allows for extending the output pulse width by applying additional trigger pulses.
• Clear input resets the multivibrator, forcing the outputs to a known state.
• Complementary outputs provide both inverted and non-inverted versions of the output signals.
• Wide supply voltage range allows for compatibility with various systems.
• Low propagation delay ensures accurate timing control.

Advantages and Disadvantages

Advantages

• Retriggerable feature provides flexibility in timing applications.
• Clear input allows for easy reset of the multivibrator.
• Complementary outputs simplify signal processing.
• Wide supply voltage range enhances compatibility.
• Low propagation delay ensures precise timing control.

Disadvantages

• Limited number of external timing components may restrict certain applications.
• Noisy environments may affect the accuracy of timing signals.

Working Principles

The SN74AHC123AN operates as a dual retriggerable monostable multivibrator. When triggered by a positive pulse on either input A or B, the multivibrator generates an output pulse whose duration is determined by the external resistor-capacitor (RC) network connected to pins RCext, Cext, and Rext. The output pulse width can be extended by applying additional trigger pulses before the completion of the current pulse.

The clear input (CLR) is used to reset the multivibrator, forcing the outputs to a known state. The complementary outputs (Qa and Qb) provide both inverted and non-inverted versions of the output signals.

Detailed Application Field Plans

The SN74AHC123AN finds applications in various timing-related fields, including:

1. Pulse Width Modulation (PWM) circuits
2. Frequency division circuits
3. Time delay generation circuits
4. Precision timing control systems
5. Sequential logic circuits
6. Industrial automation systems
7. Communication equipment
8. Automotive electronics
9. Medical devices
10. Consumer electronics

Detailed and Complete Alternative Models

• CD74HC123E: Dual Retriggerable Monostable Multivibrator with Clear and Complementary Outputs, 16-Pin PDIP Package.
• MC74VHC123A: Dual Retriggerable Monostable Multivibrator with Clear and Complementary Outputs, 16-Pin SOIC (Small Outline Integrated Circuit) Package.
• SN54AHC123AJ: Dual Retriggerable Monostable