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LM555 Timer
LM555
Texas Instrumentsic logic timer
LM555 Timer generates accurate time delays or oscillations, with timing parameters from microseconds to hours. It operates in both monostable and astable modes.
In stock
Specifications
8- Operating Voltage
- 4.5 V to 16 V
- Supply Current
- 3 mA to 15 mA (VCC = 5 V, RL = ∞)
- Interface
- GPIO, ADC (Control), GPIO (Trigger), GPIO (Reset), GPIO (Threshold), GPIO (Discharge)
- Resolution
- 1.5 % over temperature
- Range
- Microseconds to hours
- Accuracy
- 1 % initial, 0.30 % supply drift over temperature
- Temperature Range
- -65°C to 70°C
- Package
- 8-pin PDIP, SOIC, VSSOP
Pinout
8| Pin | Name | Functions | Notes |
|---|---|---|---|
| 1 | V+ | POWER | Supply voltage |
| 2 | TRIGGER | GPIO | Responsible for transition of the flip-flop from set to reset, external trigger pulse applied here |
| 3 | OUTPUT | GPIO | Output driven waveform |
| 4 | RESET | GPIO | Negative pulse applied to disable or reset the timer, connect to VCC for normal operation |
| 5 | CONTROL | GPIO | Controls threshold and trigger levels, external voltage can modulate output waveform |
| 6 | THRESHOLD | GPIO | Compares applied voltage with 2/3 of supply voltage to set flip-flop state |
| 7 | DISCHARGE | GPIO | Open collector output, toggles from high to low when voltage reaches 2/3 of the supply voltage |
| 8 | GND | GND | Ground reference voltage |
Interactive pinout
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LM555
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