CD74HC123MT

Product Overview

Category

CD74HC123MT belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in digital electronics and microcontroller-based systems.

Characteristics

• High-speed operation
• Wide operating voltage range
• Low power consumption
• Schmitt-trigger inputs for noise immunity
• Output capability: standard TTL

Package

CD74HC123MT is available in a small outline integrated circuit (SOIC) package.

Essence

The essence of CD74HC123MT lies in its ability to provide precision timing control in various digital applications.

Packaging/Quantity

This product is typically packaged in reels or tubes, with quantities varying based on customer requirements.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Current: -4mA
• Low-Level Output Current: 4mA
• Maximum Operating Frequency: 50MHz

Detailed Pin Configuration

CD74HC123MT consists of 16 pins, each serving a specific function:

1. CLR (Clear)
2. A (Input A)
3. B (Input B)
4. CEXT (External Capacitor)
5. RC (Resistor-Capacitor)
6. Q (Output Q)
7. Q̅ (Complementary Output Q)
8. GND (Ground)
9. D (Input D)
10. CP (Clock Pulse)
11. REXT (External Resistor)
12. RE (Reset Enable)
13. VCC (Supply Voltage)
14. NC (No Connection)
15. NC (No Connection)
16. NC (No Connection)

Functional Features

• Monostable multivibrator functionality
• Precise timing control
• Adjustable pulse width
• Triggering on positive or negative edges
• Output pulse duration independent of input pulse duration

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient digital signal processing.
• Wide operating voltage range enables compatibility with various systems.
• Low power consumption contributes to energy efficiency.
• Schmitt-trigger inputs provide noise immunity, ensuring reliable performance.
• Standard TTL output capability facilitates integration with other components.

Disadvantages

• Limited maximum operating frequency may restrict its use in high-frequency applications.
• Lack of built-in protection features may require additional circuitry for robustness.

Working Principles

CD74HC123MT operates as a monostable multivibrator, generating a single output pulse of adjustable width in response to an input trigger. The pulse width is determined by the external resistor-capacitor (RC) network connected to the CEXT and REXT pins. The device can be triggered on either the positive or negative edge of the clock pulse (CP). The output pulse duration is independent of the input pulse duration, providing precise timing control.

Detailed Application Field Plans

CD74HC123MT finds extensive application in various fields, including:

1. Timing circuits: Used to generate accurate time delays in microcontroller-based systems.
2. Pulse-width modulation (PWM): Enables precise control of pulse width in motor speed control, LED dimming, and audio applications.
3. Frequency division: Utilized in frequency dividers to divide input frequencies by a specific factor.
4. Sequential logic circuits: Employed in the design of counters, flip-flops, and other sequential logic elements.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to CD74HC123MT include:

1. 74HC123: A widely used CMOS version of the monostable multivibrator IC.
2. CD4098: A dual monostable multivibrator IC with additional features such as Schmitt-trigger inputs and wider operating voltage range.
3. MC14538: A precision monostable multivibrator IC with adjustable pulse width and wide supply voltage range.

These alternative models can be considered based on specific application requirements and availability.

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