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The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor
For a stable operation as an oscillator, the free-running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.
LM555 Pinout
LM555 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | GND | Ground Pin |
| 2 | TRIGGER | Trigger Pin |
| 3 | OUT | Output Pin |
| 4 | RESET | Reset Pin |
| 5 | CONTROL Voltage | Control Voltage Pin |
| 6 | THRESHOLD | Threshold Pin |
| 7 | DISCHARGE | Discharge Pin |
| 8 | +VCC | Positive Supply Voltage |
LM555 Features
- Timing from microseconds through hours
- Operates in both a stable and monostable modes
- Adjustable duty cycle
- Output can source or sink 200 mA
- Output and supply TTL compatible
- Temperature stability better than 0.005% per ˚C
- Normally on and normally off output
- Available in 8-pin MSOP package
Application
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generator
You can download this datasheet for LM555 Timer – Datasheet from the link given below:
