Overview
The SA555P is a precision timer IC produced by Texas Instruments. It is designed to operate in a wide temperature range of -40°C to 85°C, making it suitable for various environmental conditions. This device is packaged in an 8-pin PDIP (Plastic Dual In-Line Package) and is known for its accuracy in producing time delays or oscillations.
The SA555P can be used in both monostable and astable modes of operation. In the monostable mode, it generates a single pulse of a specified duration, controlled by an external resistor and capacitor network. In the astable mode, it produces a continuous square wave with adjustable frequency and duty cycle, controlled by two external resistors and a single external capacitor.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | PDIP (P) | |
| Pins | 8 | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 4.5 to 16 | V |
| Output Current | ±200 mA | |
| Threshold Voltage Level | 2.7 to 4.2 (VCC = 5 V), 9.4 to 10.6 (VCC = 15 V) | V |
| Trigger Voltage Level | 1.45 to 1.9 (VCC = 5 V), 1.1 to 1.67 (VCC = 15 V) | V |
| Reset Voltage Level | 0.1 to 0.4 | V |
| High-Level Output Voltage | 2.75 to 3.3 (VCC = 5 V), 10 to 12 (VCC = 15 V) | V |
| Low-Level Output Voltage | 0.15 to 0.4 | V |
Key Features
- Timing From Microseconds to Hours: The SA555P can generate time delays ranging from microseconds to hours, making it versatile for various timing applications.
- Astable or Monostable Operation: It can operate in both astable and monostable modes, allowing for continuous square wave generation or single pulse generation.
- Adjustable Duty Cycle: In astable mode, the frequency and duty cycle can be controlled independently using external resistors and a capacitor.
- TTL-Compatible Output: The output is compatible with TTL inputs, and it can sink or source up to 200 mA of current.
- Control-Voltage Terminal: The threshold and trigger levels can be altered using the control-voltage terminal.
- Reset Input: The reset input can override all other inputs to initiate a new timing cycle.
Applications
The SA555P is widely used in various applications requiring precise timing, including:
- Pulse Generation: Generating single pulses or continuous square waves in digital circuits.
- Timing Circuits: Creating time delays or oscillations in electronic systems.
- Alarm Systems: Implementing timing functions in security and alarm systems.
- Industrial Control Systems: Providing timing signals for industrial automation and control systems.
- Consumer Electronics: Used in various consumer electronic devices requiring timing functions.
Q & A
- What is the operating temperature range of the SA555P?
The SA555P operates in a temperature range of -40°C to 85°C.
- What are the package types available for the SA555P?
The SA555P is available in an 8-pin PDIP (Plastic Dual In-Line Package).
- What is the supply voltage range for the SA555P?
The supply voltage range for the SA555P is from 4.5 V to 16 V.
- Can the SA555P operate in both astable and monostable modes?
- How is the duty cycle adjusted in astable mode?
The duty cycle in astable mode can be adjusted independently using two external resistors and a single external capacitor.
- What is the maximum output current of the SA555P?
The SA555P can sink or source up to 200 mA of current.
- Is the output of the SA555P compatible with TTL inputs?
- How can the threshold and trigger levels be altered?
The threshold and trigger levels can be altered using the control-voltage terminal.
- What is the function of the reset input?
The reset input can override all other inputs to initiate a new timing cycle.
- What are some common applications of the SA555P?
The SA555P is used in pulse generation, timing circuits, alarm systems, industrial control systems, and consumer electronics.
