Details

---

BUY NE555 https://www.utsource.net/itm/p/12541861.html

Parameter	Symbol	Min	Typical	Max	Unit
Supply Voltage	Vcc	4.5	-	16	V
Output Current (Sink)	Iol	-	200	-	mA
Output Current (Source)	Ioh	-	200	-	mA
Trigger Input Current	Itr	-	0.5	-	μA
Threshold Input Current	Ith	-	0.5	-	μA
Reset Input Current	Irs	-	0.1	-	μA
Control Voltage Range	Vcon	2	-	7	V
Maximum Output Voltage	Vo	-	Vcc-1.5	-	V
Minimum Output Voltage	Vo	-	0.25	-	V
Power Dissipation	Pd	-	-	640	mW
Operating Temperature	Toper	-40	-	85	°C
Storage Temperature	Tstg	-65	-	150	°C

Instructions for Using the NE555 Timer IC

1. Power Supply:

   • Connect the supply voltage (Vcc) to pin 8 and ground (GND) to pin 1.
   • Ensure the supply voltage is within the range of 4.5V to 16V.

2. Trigger Input (Pin 2):

   • The trigger input is used to start the timing cycle. It is active low, meaning it triggers when the voltage drops below 1/3 of Vcc.
   • Connect a capacitor to ground and a resistor to Vcc to create a timing circuit.

3. Threshold Input (Pin 6):

   • The threshold input is used to stop the timing cycle. It is active high, meaning it resets when the voltage rises above 2/3 of Vcc.
   • In monostable mode, this pin is often connected to the capacitor that charges and discharges through the resistor.

4. Discharge (Pin 7):

   • This pin is used to discharge the external capacitor during the timing cycle.
   • In astable mode, connect this pin to the capacitor and resistor to control the timing.

5. Control Voltage (Pin 5):

   • This pin allows you to adjust the internal comparator thresholds. If not used, it should be bypassed to ground with a 10nF capacitor to avoid noise issues.

6. Reset (Pin 4):

   • The reset input can be used to stop the timer before the timing cycle is complete. It is active low, meaning it resets the timer when pulled to ground.
   • If not used, connect this pin to Vcc.

7. Output (Pin 3):

   • The output pin provides the timing signal. It can source or sink current up to 200mA.
   • Connect the load or next stage of the circuit to this pin.

8. Ground (Pin 1):

   • Connect this pin to the common ground of the circuit.

Example Circuits:

• Monostable Mode:

  • Use a single pulse to trigger the timer, which then outputs a fixed duration pulse.
  • Connect a capacitor between pin 2 and ground, and a resistor between pin 2 and Vcc.

• Astable Mode:

  • Create a continuous oscillating signal.
  • Connect a capacitor between pins 6 and 7, and two resistors in series between Vcc and pin 7. Connect the junction of the resistors to pin 6 and pin 2.

Safety Precautions:

• Ensure all connections are secure and correct to avoid damaging the IC.
• Do not exceed the maximum ratings for any parameter.
• Use appropriate decoupling capacitors to stabilize the power supply and reduce noise.

By following these instructions, you can effectively use the NE555 timer IC in various applications.

(For reference only)