Overview
The SE555DR, produced by Texas Instruments, is a precision timer integrated circuit designed for a wide range of timing applications. It is part of the xx555 family, which includes the NA555, NE555, SA555, and SE555 models. The SE555DR is specifically engineered to operate over an extended temperature range of -55°C to 125°C, making it suitable for harsh environmental conditions.
This device is capable of producing accurate time delays or oscillations and can be configured in both monostable and astable modes. The SE555DR is widely used in various electronic circuits due to its reliability, precision, and versatility.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | - | 18 | V |
| Operating Free-Air Temperature (TA) | -55 | - | 125 | °C |
| Output Current (IO) | - | - | ±200 | mA |
| Threshold Voltage Level (THRES) | 2.4 | 3.3 | 4.2 | V |
| Trigger Voltage Level (TRIG) | 1.1 | 1.67 | 2.2 | V |
| Reset Voltage Level (RESET) | 0.1 | - | 1.1 | V |
| Discharge Switch On-State Voltage | 0.15 | - | 0.4 | V |
| Output Pulse Rise Time (CL = 15 pF) | 100 | - | 200 | ns |
| Output Pulse Fall Time (CL = 15 pF) | 100 | - | 200 | ns |
Key Features
- Precision Timing: Capable of producing accurate time delays or oscillations.
- Monostable and Astable Operation: Can be configured in both monostable and astable modes.
- Adjustable Duty Cycle: In astable mode, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.
- High Current Output: The output circuit can sink or source current up to 200 mA.
- Wide Temperature Range: Operates over an extended temperature range of -55°C to 125°C.
- Low Supply Voltage Sensitivity: Timing interval is relatively insensitive to supply voltage changes.
- Reset Functionality: The reset input can override all other inputs and initiate a new timing cycle.
Applications
- Timing and Pulse Generation: Used in circuits requiring precise timing intervals or pulse generation.
- Alarm and Timer Systems: Suitable for alarm systems, timer circuits, and other applications requiring timed intervals.
- Industrial Control Systems: Employed in industrial control systems where precise timing is crucial.
- Aerospace and Military Applications: Due to its extended temperature range, it is suitable for use in harsh environments such as aerospace and military applications.
- Automotive Systems: Used in automotive systems that require reliable timing under various environmental conditions.
Q & A
- What is the operating temperature range of the SE555DR?
The SE555DR operates over an extended temperature range of -55°C to 125°C.
- What are the supply voltage limits for the SE555DR?
The supply voltage (VCC) for the SE555DR ranges from 4.5 V to 18 V.
- Can the SE555DR be used in both monostable and astable modes?
Yes, the SE555DR can be configured in both monostable and astable modes.
- What is the maximum output current of the SE555DR?
The output circuit of the SE555DR can sink or source current up to 200 mA.
- How does the reset input function on the SE555DR?
The reset input can override all other inputs and initiate a new timing cycle by setting the output and discharge low.
- What is the typical output pulse rise and fall time for the SE555DR?
The typical output pulse rise and fall time for the SE555DR is 100 to 200 ns with a load capacitance (CL) of 15 pF.
- Is the SE555DR compatible with TTL inputs?
Yes, with a 5-V supply, the output levels of the SE555DR are compatible with TTL inputs.
- What are some common applications of the SE555DR?
The SE555DR is commonly used in timing and pulse generation circuits, alarm and timer systems, industrial control systems, aerospace and military applications, and automotive systems.
- How does the adjustable duty cycle work in astable mode?
In astable mode, the frequency and duty cycle can be controlled independently using two external resistors and a single external capacitor.
- What is the significance of the discharge switch on the SE555DR?
The discharge switch provides a low-impedance path between the discharge pin and ground, allowing the timing capacitor to discharge quickly.
