LM556CN

Product Overview

Category: Integrated Circuit (IC)

Use: The LM556CN is a dual timer IC that combines two independent 555 timers in a single package. It is widely used in various electronic circuits and systems where precise timing is required.

Characteristics: - Dual timer functionality - High accuracy and stability - Wide operating voltage range - Low power consumption - Compact package size

Package: The LM556CN is available in a standard 14-pin DIP (Dual Inline Package) format, which allows for easy integration into circuit boards.

Essence: The essence of the LM556CN lies in its ability to provide accurate timing signals for a wide range of applications.

Packaging/Quantity: The LM556CN is typically sold in reels or tubes containing multiple units, with each reel or tube containing a specific quantity of ICs.

Specifications

The LM556CN has the following specifications:

• Supply Voltage Range: 4.5V to 16V
• Operating Temperature Range: -40°C to +85°C
• Timing Capacitance Range: 100pF to 100μF
• Timing Resistance Range: 1kΩ to 100MΩ
• Output Current: 200mA
• Trigger Voltage: 1/3 Vcc
• Reset Voltage: 0.7Vcc

Pin Configuration

The LM556CN has a total of 14 pins, which are assigned specific functions as follows:

1. GND: Ground reference for the IC.
2. TRIG1: Trigger input for Timer 1.
3. OUT1: Output of Timer 1.
4. RESET1: Reset input for Timer 1.
5. CTRL1: Control voltage input for Timer 1.
6. THRES1: Threshold input for Timer 1.
7. DISCH1: Discharge output for Timer 1.
8. VCC: Positive supply voltage.
9. CTRL2: Control voltage input for Timer 2.
10. THRES2: Threshold input for Timer 2.
11. DISCH2: Discharge output for Timer 2.
12. RESET2: Reset input for Timer 2.
13. OUT2: Output of Timer 2.
14. TRIG2: Trigger input for Timer 2.

Functional Features

The LM556CN offers the following functional features:

• Dual independent timers that can operate separately or together.
• Adjustable timing intervals using external resistors and capacitors.
• Monostable (one-shot) or astable (oscillator) operation modes.
• Wide range of timing options, from microseconds to hours.
• High output current capability for driving external loads.
• Low power consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Integration of two timers in a single package saves board space and reduces component count. - High accuracy and stability ensure precise timing control. - Versatile functionality allows for a wide range of applications. - Low power consumption extends battery life in portable devices.

Disadvantages: - Limited number of timing channels compared to individual 555 timer ICs. - Relatively higher cost compared to standalone 555 timers.

Working Principles

The LM556CN operates based on the principles of the classic 555 timer IC. Each timer within the LM556CN can function independently or in conjunction with the other timer. The timing interval is determined by the values of external resistors and capacitors connected to the respective timing pins.

In monostable mode, a trigger signal initiates a timing cycle, during which the output remains high for a specific duration determined by the RC time constant. In astable mode, the IC oscillates between high and low states, generating a continuous square wave output.

Application Field Plans

The LM556CN finds applications in various fields, including:

1. Timing circuits: Used to generate precise time delays, pulse widths, or frequency modulation.
2. Oscillators: Employed to generate clock signals, tone generation, or frequency synthesis.
3. Control systems: Utilized for timing control in motor speed controllers, lighting systems, or robotics.
4. Communication systems: Integrated into data transmission protocols, modulation/demodulation circuits, or remote control systems.
5. Automotive electronics: Applied in automotive ignition systems, engine control units, or anti-lock braking systems.

Alternative Models

In addition to the LM556CN, there are several alternative models available that offer similar functionality. Some popular alternatives include:

• NE556
• TLC556
• ICM7556
• LMC555

These alternatives can be considered based on specific requirements, availability, and cost considerations.

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