SA556N

Overview

Category: Integrated Circuit (IC)

Use: Timer and Oscillator

Characteristics: - Dual Precision Timer - Low Power Consumption - Wide Operating Voltage Range - High Output Current Capability - Compact Package Design

Package: DIP-14 (Dual In-line Package, 14 pins)

Essence: The SA556N is a dual precision timer integrated circuit that combines two independent timers in a single package. It is commonly used in various timing and oscillator applications.

Packaging/Quantity: The SA556N is typically available in reels or tubes, with a quantity of 50 units per reel/tube.

Specifications

The specifications of the SA556N are as follows:

• Supply Voltage Range: 4.5V to 16V
• Supply Current: 500µA (typical)
• Operating Temperature Range: -40°C to +85°C
• Timer Frequency Range: 0.001Hz to 1MHz
• Trigger Voltage: 1.67V (typical)
• Reset Voltage: 0.8V (typical)
• Output Current: 200mA (maximum)

Pin Configuration

The SA556N has a total of 14 pins, which are assigned specific functions. The pin configuration is as follows:

```

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| | | 1 7 | --|o----o-----|-- | | | 2 6 | --|o----o-----|-- | | | 3 5 | --|o----o-----|-- | 4 | --|o----------|-- |___________| ```

Pin Description: 1. Control Voltage (CV1) 2. Threshold (TH1) 3. Discharge (DIS1) 4. Ground (GND) 5. Control Voltage (CV2) 6. Threshold (TH2) 7. Discharge (DIS2) 8. Output 1 (OUT1) 9. Trigger 1 (TR1) 10. Reset 1 (RST1) 11. VCC 12. Reset 2 (RST2) 13. Trigger 2 (TR2) 14. Output 2 (OUT2)

Functional Features

The SA556N offers the following functional features:

• Dual Independent Timers: The IC contains two separate timers that can operate independently or in synchronization.
• Adjustable Timing: The timing characteristics of each timer can be adjusted using external resistors and capacitors.
• Wide Operating Voltage Range: The IC can operate within a wide voltage range, making it suitable for various applications.
• Low Power Consumption: The SA556N consumes minimal power, making it ideal for battery-powered devices.
• High Output Current Capability: The output pins can drive high current loads, eliminating the need for additional amplification circuitry.

Advantages and Disadvantages

Advantages: - Dual timer functionality in a single package saves board space and reduces component count. - Precise timing accuracy allows for reliable operation in time-critical applications. - Versatile operating voltage range enables compatibility with different power supply configurations.

Disadvantages: - Limited number of timers compared to other multi-timer ICs. - Lack of built-in protection features may require additional circuitry for certain applications.

Working Principles

The SA556N operates based on the principles of timing and oscillation. Each timer consists of a threshold comparator, a discharge transistor, and a control voltage amplifier. By adjusting the external resistors and capacitors connected to the timers, precise timing intervals can be achieved.

When triggered, the timers start counting based on the RC time constant determined by the external components. Once the threshold voltage is reached, the output switches state, and the discharge transistor discharges the timing capacitor, resetting the timer.

Application Field Plans

The SA556N can be used in various applications that require precise timing and oscillation control. Some potential application fields include:

1. Pulse Width Modulation (PWM) Generation
2. Frequency Division and Multiplication
3. Time Delay Circuits
4. Tone Generation and Musical Instruments
5. LED and Display Drivers
6. Motor Control
7. Precision Timing Circuits

Alternative Models

In addition to the SA556N, there are several alternative models available that offer similar functionality. Some notable alternatives include:

1. NE556: Dual Timer IC with similar specifications and pin configuration.
2. LM556: Dual Timer IC with enhanced features and improved performance.
3. TLC556: Dual Timer IC with low power consumption and extended temperature range.

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

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