CD74HCT123M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed operation, wide supply voltage range, low power consumption
• 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: 2V to 6V
• High-Level Input Voltage: 3.15V (minimum), 6V (maximum)
• Low-Level Input Voltage: 0.8V (maximum)
• High-Level Output Voltage: 4.4V (minimum), VCC (maximum)
• Low-Level Output Voltage: 0.5V (maximum)
• Maximum Quiescent Supply Current: 4µA
• Maximum Operating Frequency: 33MHz

Detailed Pin Configuration

1. CLR (Clear) - Active LOW input for resetting the output
2. A (Trigger) - Active HIGH input for triggering the multivibrator
3. B (Retrigger) - Active HIGH input for retriggering the multivibrator
4. REXT (External Resistor) - Connected to an external resistor for setting the timing interval
5. CEXT (External Capacitor) - Connected to an external capacitor for setting the timing interval
6. Q (Output) - Output of the multivibrator
7. GND (Ground) - Ground reference for the IC
8. NC (No Connection) - Not connected pin
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. VCC (Supply Voltage) - Positive supply voltage for the IC
15. NC (No Connection) - Not connected pin
16. NC (No Connection) - Not connected pin

Functional Features

• Dual retriggerable monostable multivibrator with independent trigger and retrigger inputs
• Output pulse width can be adjusted using external resistor and capacitor
• Trigger and retrigger inputs have Schmitt-trigger action for noise immunity
• Can be used as a frequency divider or time delay generator
• High-speed operation allows for precise timing applications
• Wide supply voltage range enables compatibility with various systems
• Low power consumption makes it suitable for battery-powered devices

Advantages

• Flexible and versatile functionality for various timing applications
• Easy to use with straightforward pin configuration
• High-speed operation ensures accurate timing control
• Wide supply voltage range provides compatibility with different systems
• Low power consumption extends battery life in portable devices

Disadvantages

• Limited number of available pins for additional functionalities
• External components required for setting the timing interval
• Not suitable for high-frequency applications due to limited operating frequency

Working Principles

The CD74HCT123M is a dual retriggerable monostable multivibrator. It generates an output pulse of a fixed duration when triggered by a positive edge at the trigger input (A). The output pulse width can be adjusted using an external resistor (REXT) and capacitor (CEXT) connected to pins 4 and 5, respectively. The multivibrator can be retriggered by applying a positive pulse to the retrigger input (B) during the output pulse period.

Detailed Application Field Plans

1. Timing circuits: The CD74HCT123M can be used in various timing applications such as timers, clocks, and frequency dividers.
2. Pulse generation: It is suitable for generating precise output pulses of fixed duration in applications like pulse-width modulation (PWM) and waveform generation.
3. Control systems: The multivibrator can be utilized in control systems where accurate timing is required, such as in robotics and industrial automation.
4. Communication systems: It can be employed in communication systems for synchronization purposes and to generate specific time intervals.

Detailed and Complete Alternative Models

1. CD74HC123E - Similar functionality with a different package (16-pin DIP)
2. MC74HCT123AN - Equivalent IC from a different manufacturer (Motorola)

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