Encyclopedia Entry: 74HC123D-Q100,118

Product Overview

Category

The 74HC123D-Q100,118 belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as timing and control circuits.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Compatibility with TTL inputs
• Monostable multivibrator functionality

Package

The 74HC123D-Q100,118 is available in a small outline package (SOIC) with 16 pins. This package offers ease of handling and compatibility with standard PCB designs.

Essence

The essence of this product lies in its ability to provide precise timing and control signals in digital circuits.

Packaging/Quantity

The 74HC123D-Q100,118 is typically packaged in reels or tubes, containing a specific quantity of ICs per package. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -40°C to +125°C
• Input Voltage High Level (VIH): 2V to VCC + 0.5V
• Input Voltage Low Level (VIL): -0.5V to 0.8V
• Output Voltage High Level (VOH): VCC - 0.5V
• Output Voltage Low Level (VOL): 0.1V
• Maximum Propagation Delay Time: 60ns

Detailed Pin Configuration

The 74HC123D-Q100,118 has 16 pins arranged as follows:

1. Pin 1: Clear (CLR)
2. Pin 2: A Input
3. Pin 3: B Input
4. Pin 4: GND (Ground)
5. Pin 5: RC Input
6. Pin 6: RE Input
7. Pin 7: Q Output
8. Pin 8: Q̅ Output
9. Pin 9: VCC (Supply Voltage)
10. Pin 10: D Input
11. Pin 11: C Input
12. Pin 12: GND (Ground)
13. Pin 13: Q Output
14. Pin 14: Q̅ Output
15. Pin 15: Clock (CLK) Input
16. Pin 16: GND (Ground)

Functional Features

The 74HC123D-Q100,118 is a dual retriggerable monostable multivibrator with reset. It can generate precise output pulses of a specified duration upon receiving trigger signals. The key functional features include:

• Retriggerable operation
• Adjustable pulse width
• Clear input for immediate termination of the output pulse
• Schmitt-trigger inputs for noise immunity
• Symmetrical output characteristics

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient timing control in digital circuits.
• Low power consumption makes it suitable for battery-powered applications.
• Wide operating voltage range provides flexibility in various voltage environments.
• Compatibility with TTL inputs enables seamless integration with existing systems.
• Monostable multivibrator functionality offers precise pulse generation.

Disadvantages

• Limited number of available alternative models may restrict design options.
• Propagation delay time may affect timing accuracy in certain applications.
• Sensitivity to electrostatic discharge (ESD) requires proper handling precautions.

Working Principles

The 74HC123D-Q100,118 operates based on the principles of retriggerable monostable multivibrators. When triggered by an input signal, the IC generates an output pulse of a specific duration determined by external resistor-capacitor (RC) components. The pulse width can be adjusted by varying the values of these external components. The output pulse is terminated either by the completion of the specified duration or by a clear signal applied to the CLR input.

Detailed Application Field Plans

The 74HC123D-Q100,118 finds applications in various fields, including:

1. Timing circuits: Used to generate precise timing signals for synchronization purposes.
2. Control systems: Employed to control the duration of specific operations or events.
3. Communication devices: Utilized for generating pulses in data transmission protocols.
4. Industrial automation: Integrated into control modules for accurate timing and sequencing.
5. Robotics: Incorporated in control circuits for precise timing and coordination of movements.

Detailed and Complete Alternative Models

While the 74HC123D-Q100,118 is a popular choice, there are alternative models available that offer similar functionality. Some notable alternatives include:

1. CD74HC123E: A similar dual retriggerable monostable multivibrator with reset from Texas Instruments.
2. MC74HC123AN: Another dual retriggerable monostable multivibrator