Overview
The SA555DE4 is a precision timer integrated circuit produced by Texas Instruments. It is part of the 555 timer family, known for its versatility and reliability in various timing and pulse generation applications. The SA555DE4 is specifically designed to operate over a wide temperature range, making it suitable for use in harsh environments.
This device can be configured for both monostable and astable operations, allowing it to generate single pulses or continuous waveforms. The SA555DE4 is compatible with a supply voltage range of 4.5V to 18V, making it adaptable to different power supply conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | - | 18 | V |
| Operating Free-Air Temperature | -55 | - | 125 | °C |
| Output Current | - | - | ±200 | mA |
| Threshold Voltage Level | 2.4 | 3.3 | 4.2 | V |
| Trigger Voltage Level | 1.1 | 1.67 | 2.2 | V |
| Reset Voltage Level | 0.1 | 0.4 | - | V |
| High-Level Output Voltage | 12.5 | - | - | V |
| Low-Level Output Voltage | - | - | 0.4 | V |
| Supply Current (No Load) | 9 | - | 13 | mA |
Key Features
- Wide Supply Voltage Range: Operates from 4.5V to 18V, making it versatile for different power supply conditions.
- High Temperature Range: Designed to operate from -55°C to 125°C, suitable for harsh environments.
- Monostable and Astable Operations: Can be configured for both single pulse (monostable) and continuous waveform (astable) generation.
- High Current Output: Capable of sourcing or sinking up to 200 mA, suitable for driving various loads.
- Low Threshold and Trigger Voltages: Allows for precise timing control with threshold and trigger voltages as low as 2.4V and 1.1V respectively.
- Reset Functionality: Includes an active low reset input to force the output and discharge low.
Applications
- Pulse Generation: Used in circuits requiring precise timing and pulse generation, such as in digital logic circuits and microcontroller projects.
- Timing Circuits: Ideal for creating timing circuits in various electronic devices, including alarm systems, LED flashers, and heart rate monitors.
- Power Supply Sequencing: Can be used to sequence power supplies in complex electronic systems to ensure proper startup and shutdown procedures.
- Audio and Visual Effects: Utilized in audio and visual effect circuits, such as sound generators and LED displays.
- Industrial Control Systems: Employed in industrial control systems for timing and sequencing operations.
Q & A
- What is the operating temperature range of the SA555DE4?
The SA555DE4 operates from -55°C to 125°C.
- What is the supply voltage range for the SA555DE4?
The supply voltage range is from 4.5V to 18V.
- Can the SA555DE4 be used for both monostable and astable operations?
Yes, the SA555DE4 can be configured for both monostable and astable operations.
- What is the maximum output current of the SA555DE4?
The maximum output current is ±200 mA.
- How do you reset the SA555DE4?
The SA555DE4 has an active low reset input that forces the output and discharge low when activated.
- What are the typical applications of the SA555DE4?
Typical applications include pulse generation, timing circuits, power supply sequencing, audio and visual effects, and industrial control systems.
- What is the threshold voltage level for the SA555DE4?
The threshold voltage level ranges from 2.4V to 4.2V.
- How does the trigger input work on the SA555DE4?
The trigger input sets the output high and the discharge open when the trigger voltage falls below 1/3 of the supply voltage.
- Can the SA555DE4 be used in harsh environments?
Yes, the SA555DE4 is designed to operate in harsh environments due to its wide temperature range.
- What is the purpose of the discharge pin on the SA555DE4?
The discharge pin is used to discharge the timing capacitor during the timing cycle.
