CD74HC423E

Product Overview

• Category: Integrated Circuit
• Use: Logic Gates and Flip-Flops
• Characteristics: High-Speed CMOS, Dual Retriggerable Monostable Multivibrator
• Package: 16-pin DIP (Dual In-line Package)
• Essence: The CD74HC423E is a versatile integrated circuit that combines logic gates and flip-flops to create a dual retriggerable monostable multivibrator. It is designed for high-speed operation and is commonly used in various digital applications.
• Packaging/Quantity: Available in tubes or reels, with quantities varying based on customer requirements.

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: HC (High-Speed CMOS)
• Number of Pins: 16
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 9 ns (typical)
• Output Current: ±25 mA
• Input Capacitance: 3.5 pF (typical)

Pin Configuration

The CD74HC423E has a total of 16 pins, each serving a specific function. Here is the detailed pin configuration:

1. CLR1: Clear Input 1
2. A1: Data Input 1
3. B1: Data Input 2
4. REXT1: External Resistor/Capacitor Connection 1
5. CEXT1: External Resistor/Capacitor Connection 1
6. Q1: Output 1
7. Q1: Complementary Output 1
8. GND: Ground
9. VCC: Supply Voltage
10. Q2: Output 2
11. Q2: Complementary Output 2
12. CEXT2: External Resistor/Capacitor Connection 2
13. REXT2: External Resistor/Capacitor Connection 2
14. B2: Data Input 2
15. A2: Data Input 1
16. CLR2: Clear Input 2

Functional Features

• Dual Retriggerable Monostable Multivibrator: The CD74HC423E can be triggered by either a positive or negative edge on the input signals, making it highly versatile in various applications.
• Wide Operating Voltage Range: With a supply voltage range of 2V to 6V, this IC can be used in different power supply configurations.
• High-Speed Operation: The HC logic family ensures fast switching times and low propagation delays, making it suitable for high-speed digital circuits.
• Output Flexibility: The CD74HC423E provides both normal and complementary outputs for each monostable multivibrator, allowing for flexible signal routing.

Advantages and Disadvantages

Advantages: - Versatile functionality with dual retriggerable monostable multivibrators. - Wide operating voltage range allows for compatibility with various power supply configurations. - High-speed operation enables efficient performance in digital circuits. - Output flexibility provides options for signal routing.

Disadvantages: - Limited number of pins may restrict the complexity of circuits that can be implemented. - Requires external resistors/capacitors for proper operation, which adds additional components to the circuit design.

Working Principles

The CD74HC423E operates based on the principles of monostable multivibrators. When triggered by an input signal, the IC generates a pulse of a specific duration determined by the external resistor and capacitor connected to the respective pins. This pulse can be retriggered by subsequent input signals, extending the output pulse width. The dual nature of the IC allows for independent operation of two monostable multivibrators.

Detailed Application Field Plans

The CD74HC423E finds applications in various digital systems, including but not limited to: - Timing and Delay Circuits: The retriggerable nature of the IC makes it suitable for generating precise timing signals and delays in digital systems. - Pulse Width Modulation (PWM): By adjusting the external resistor and capacitor values, the IC can be used to generate PWM signals for controlling motor speed, LED brightness, etc. - Frequency Division: The CD74HC423E can be utilized to divide input frequencies by a specific factor, enabling frequency division applications.

Detailed and Complete Alternative Models

1. CD74HC123E: Similar to CD74HC423E, but with a single retriggerable monostable multivibrator.
2. CD74HCT423E: A variant of CD74HC423E that operates at higher temperatures (-55°C to +125°C).
3. CD74HC221E: Dual non-retriggerable monostable multivibrator with Schmitt-trigger inputs.

These alternative models offer similar functionality to the CD74HC423