CD74HC123M

Product Overview

• Category: Integrated Circuit
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed CMOS logic, dual retriggerable monostable multivibrator
• Package: 16-pin SOIC (Small Outline Integrated Circuit)
• Essence: CD74HC123M is a versatile integrated circuit that can be used as a multivibrator or a monostable multivibrator. It is part of the HC family of high-speed CMOS logic.
• Packaging/Quantity: The CD74HC123M is typically sold in reels of 250 units.

Specifications

• Supply Voltage: 2V to 6V
• Propagation Delay: 14 ns
• Operating Temperature Range: -40°C to +85°C
• Output Current: ±5.2 mA
• Input Capacitance: 3.5 pF
• Logic Family: HC (High-Speed CMOS)

Pin Configuration

The CD74HC123M has a 16-pin SOIC package with the following pin configuration:

1. CLR (Clear)
2. A (Trigger Input)
3. B (Trigger Input)
4. REXT (External Resistor)
5. CEXT (External Capacitor)
6. Q (Output)
7. GND (Ground)
8. Q (Complementary Output)
9. VCC (Positive Power Supply)
10. NC (No Connection)
11. NC (No Connection)
12. NC (No Connection)
13. NC (No Connection)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

• Dual retriggerable monostable multivibrator
• Can be configured as a multivibrator or a monostable multivibrator
• Wide operating voltage range
• High-speed operation
• Low power consumption

Advantages and Disadvantages

Advantages: - Versatile functionality as a multivibrator or monostable multivibrator - High-speed CMOS logic for fast operation - Dual retriggerable design allows for flexible timing control - Wide operating voltage range enables compatibility with various systems

Disadvantages: - Limited output current capability - Input capacitance may affect performance in high-frequency applications

Working Principles

The CD74HC123M is based on high-speed CMOS technology, which combines the advantages of both CMOS and TTL logic families. It consists of two independent retriggerable monostable multivibrators that can be triggered by either positive or negative edges of the input signals.

When used as a multivibrator, the CD74HC123M generates two complementary outputs with a fixed time delay between them. This feature is useful in applications such as clock synchronization and frequency division.

As a monostable multivibrator, the CD74HC123M produces a single pulse of a programmable duration in response to a trigger signal. This functionality is commonly employed in applications requiring precise timing, such as pulse width modulation and time-delay circuits.

Detailed Application Field Plans

The CD74HC123M finds applications in various fields, including:

1. Timing circuits: The ability to generate accurate and adjustable time delays makes it suitable for applications such as timers, counters, and frequency dividers.
2. Communication systems: Used in data transmission systems to synchronize signals and control timing.
3. Industrial automation: Employed in control systems to generate precise timing signals for process control and sequencing.
4. Automotive electronics: Used in automotive systems for functions like ignition timing, fuel injection control, and motor control.
5. Consumer electronics: Found in devices like remote controls, audio/video equipment, and digital cameras for timing and synchronization purposes.

Detailed and Complete Alternative Models

1. CD74HC123E: Similar to CD74HC123M but in a 16-pin DIP (Dual Inline Package) format.
2. MC74HC123AN: Equivalent monostable multivibrator IC from another manufacturer, Motorola.

These alternative models offer similar functionality and can be used as substitutes for the CD74HC123M in various applications.

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