Details

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BUY LM555 https://www.utsource.net/itm/p/12536103.html

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	Vcc	4.5	-	16	V
Output Current (Sink)	Ios	-	200	-	mA
Output Current (Source)	Iol	-	200	-	mA
Trigger Input Voltage	Vtr	1/3 Vcc	-	2/3 Vcc	V
Threshold Input Voltage	Vth	1/3 Vcc	-	2/3 Vcc	V
Control Voltage	Vc	-	-	-	V
Reset Input Voltage	Vres	-	-	-	V
Power Dissipation	Pd	-	-	600	mW
Operating Temperature	Topr	0	-	70	°C

Instructions for Using LM555 Timer IC:

1. Power Supply:

   • Connect the supply voltage (Vcc) between pin 8 and ground (pin 1). The typical operating range is from 4.5V to 16V.

2. Trigger Input (Pin 2):

   • This pin is used to trigger the timer into the active state when the voltage drops below 1/3 of Vcc. It can be connected to external signals or switches.

3. Output (Pin 3):

   • Provides the output signal. Can source or sink up to 200mA current, suitable for driving LEDs, relays, etc.

4. Reset Input (Pin 4):

   • A low logic level on this pin will reset the timer regardless of other inputs. If not used, connect it to Vcc.

5. Control Voltage (Pin 5):

   • Allows direct access to the internal voltage divider. It can be used to adjust the threshold and trigger levels. Typically bypassed to ground with a capacitor to avoid noise.

6. Threshold Input (Pin 6):

   • When the voltage at this pin exceeds 2/3 of Vcc, it resets the timer. Often connected to an external resistor-capacitor network for timing purposes.

7. Discharge (Pin 7):

   • Internally connected to the open collector transistor which can be used to discharge a capacitor in monostable or astable configurations.

8. Ground (Pin 1):

   • Connect this pin directly to the ground.

9. Configuration:

   • For monostable mode, apply a pulse to the trigger input; the output goes high for a period determined by an external RC network.
   • For astable mode, configure pins 2, 6, and 7 with resistors and capacitors to create a continuous oscillation.

10. Temperature Considerations:

    • Ensure that the operating temperature stays within the specified range (0°C to 70°C) to maintain reliable operation.

(For reference only)