CD74HCT123MG4

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed, CMOS technology, low power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 3.15V (minimum), 6V (maximum)
• Low-Level Input Voltage: 0.35V (maximum)
• High-Level Output Voltage: 4.4V (minimum), VCC (maximum)
• Low-Level Output Voltage: 0.5V (maximum)
• Maximum Quiescent Supply Current: 8µA
• Maximum Propagation Delay Time: 60ns
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The CD74HCT123MG4 has a total of 16 pins. The pin configuration is as follows:

1. CLR (Clear) - Active LOW input for resetting the output
2. A (Trigger) - Active HIGH input for triggering the multivibrator
3. B (Trigger) - Active HIGH input for triggering the multivibrator
4. REXT (External Resistor) - Connects an external resistor for controlling the timing
5. CEXT (External Capacitor) - Connects an external capacitor for controlling the timing
6. Q (Output) - Output of the multivibrator
7. GND (Ground) - Ground reference for the IC
8. VCC (Supply Voltage) - Positive supply voltage for the IC
9. NC (No Connection) - Not connected
10. NC (No Connection) - Not connected
11. NC (No Connection) - Not connected
12. NC (No Connection) - Not connected
13. NC (No Connection) - Not connected
14. NC (No Connection) - Not connected
15. NC (No Connection) - Not connected
16. NC (No Connection) - Not connected

Functional Features

• Retriggerable monostable multivibrator with two trigger inputs
• Output pulse width can be adjusted using external resistor and capacitor
• Trigger inputs are edge-sensitive, allowing precise control over the output pulse width
• Can be used as a frequency divider or time delay generator
• High-speed operation with low power consumption
• CMOS technology ensures compatibility with a wide range of digital systems

Advantages and Disadvantages

Advantages: - Dual trigger inputs provide flexibility in triggering the multivibrator - Adjustable output pulse width allows customization for specific applications - High-speed operation enables rapid response times - Low power consumption helps conserve energy in battery-powered devices - CMOS technology ensures compatibility with various digital systems

Disadvantages: - Limited supply voltage range (2V to 6V) - Maximum propagation delay time may limit performance in certain applications - Requires external resistor and capacitor for timing control

Working Principles

The CD74HCT123MG4 is a dual retriggerable monostable multivibrator. It generates an output pulse of a fixed duration when triggered by a positive edge on either of its trigger inputs (A or B). The output pulse width can be adjusted by connecting an external resistor (REXT) and capacitor (CEXT) to the respective pins.

Upon receiving a trigger signal, the multivibrator output (Q) goes high for the duration determined by the values of the external resistor and capacitor. The output remains high until the next trigger input occurs, regardless of the input pulse width. The multivibrator can be retriggered during the output pulse, extending its duration.

Detailed Application Field Plans

The CD74HCT123MG4 finds applications in various fields, including:

1. Timing Circuits: The adjustable output pulse width makes it suitable for generating precise time delays in applications such as timers, clocks, and sequential logic circuits.
2. Frequency Division: By using the multivibrator as a frequency divider, it can be employed in frequency synthesizers, digital counters, and frequency measurement systems.
3. Pulse Shaping: The monostable multivibrator can shape input pulses into fixed-width output pulses, useful in communication systems, data transmission, and signal processing.
4. Control Systems: It can be utilized in control circuits to generate accurate timing signals for synchronization, pulse-width modulation, and motor control.
5. Instrumentation: The multivibrator's ability to generate precise time intervals finds application in oscilloscopes, function generators, and other test and measurement equipment.

Detailed and Complete Alternative Models

1. CD74HC123E - Similar dual retriggerable monostable