LM556CM/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Timer and oscillator applications
• Characteristics: Dual precision timer with independent control circuits
• Package: 14-pin SOIC (Small Outline Integrated Circuit)
• Essence: The LM556CM/NOPB is a versatile dual timer IC that combines two independent timers in a single package, offering precise timing and oscillation capabilities.
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 4.5V to 16V
• Operating Temperature Range: -40°C to +85°C
• Timing Capacitance Range: 100pF to 100μF
• Timing Resistance Range: 1kΩ to 100MΩ
• Maximum Output Current: ±20mA
• Trigger Voltage: 1.67V (typical)

Pin Configuration

The LM556CM/NOPB features a 14-pin SOIC package with the following pin configuration:

1. GND (Ground)
2. TRIG A (Timer A Trigger)
3. OUT A (Timer A Output)
4. RESET A (Timer A Reset)
5. CTRL A (Timer A Control Voltage)
6. THRES A (Timer A Threshold)
7. DISCH A (Timer A Discharge)
8. VCC (Supply Voltage)
9. DISCH B (Timer B Discharge)
10. THRES B (Timer B Threshold)
11. CTRL B (Timer B Control Voltage)
12. RESET B (Timer B Reset)
13. OUT B (Timer B Output)
14. TRIG B (Timer B Trigger)

Functional Features

• Dual Independent Timers: Allows simultaneous operation of two separate timing functions.
• Wide Timing Range: Supports a wide range of timing resistances and capacitances for versatile applications.
• Precise Timing: Offers accurate timing capabilities with low drift and high stability.
• Adjustable Control Voltage: Allows fine-tuning of the timing characteristics by adjusting the control voltage.
• Trigger and Reset Inputs: Provides flexibility in triggering and resetting the timers.

Advantages

• Space-saving: Combines two timers in a single package, reducing component count and board space requirements.
• Cost-effective: Eliminates the need for multiple individual timer ICs, resulting in cost savings.
• Versatile: Can be used in various applications requiring precise timing and oscillation control.

Disadvantages

• Limited Output Current: The maximum output current of ±20mA may not be sufficient for certain high-current applications.
• Single Supply Voltage: Requires a single supply voltage, which may limit compatibility with certain systems that require dual supply voltages.

Working Principles

The LM556CM/NOPB operates based on the principles of an astable multivibrator. Each timer within the IC consists of a flip-flop, a discharge transistor, resistors, and capacitors. By controlling the timing resistors, capacitors, and control voltage, the user can achieve desired timing intervals and oscillation frequencies.

Application Field Plans

The LM556CM/NOPB finds applications in various fields, including:

1. Precision Timing: Used in precision instruments, such as digital clocks and timers.
2. Pulse Generation: Generates precise pulses for applications like frequency counters and waveform generators.
3. Oscillation Control: Provides stable oscillation for applications like tone generation and frequency modulation.
4. Sequential Timing: Enables sequential operations in devices like traffic light controllers and industrial automation systems.

Alternative Models

Other alternative models that offer similar functionality to the LM556CM/NOPB include:

1. NE556
2. ICM7556
3. TLC556
4. MC14536B

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

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