Details

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BUY ICM7555ISA https://www.utsource.net/itm/p/119441.html
General Purpose timers

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	VCC	4.5	-	16	V
Operating Temperature	TA	-40	-	85	°C
Output Current (Source)	IOH	-	100	-	μA
Output Current (Sink)	IOL	-	100	-	μA
Trigger Level	VT	1/3VCC	-	2/3VCC	V
Threshold Level	VTH	2/3VCC	-	2/3VCC	V
Reset Input Level	VR	0.9	-	VCC	V
Control Voltage Range	VCTL	0.5	-	VCC	V
Maximum Output Voltage	VO	0	-	VCC - 1.5	V

Instructions for Using ICM7555ISA

1. Power Supply:

   • Connect the supply voltage (V_CC) 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 active low. It should be pulled low to start the timing cycle.
   • The trigger level is typically set at 1/3 of V_CC.

3. Threshold Input (Pin 6):

   • The threshold input is used to reset the timer. It should be pulled high to stop the timing cycle.
   • The threshold level is typically set at 2/3 of V_CC.

4. Discharge (Pin 7):

   • This pin is used to discharge the external capacitor during the timing cycle.
   • Connect it to the external capacitor and resistor to control the timing.

5. Reset (Pin 4):

   • The reset input can be used to reset the timer. It should be pulled high to reset the timer.
   • If not used, connect it to V_CC.

6. Control Voltage (Pin 5):

   • This pin can be used to vary the threshold and trigger levels.
   • If not used, connect it to ground through a 10nF capacitor.

7. Output (Pin 3):

   • The output pin provides the timing signal. It can source or sink up to 100μA.
   • Connect the load to this pin as required.

8. Operating Temperature:

   • Ensure the device operates within the temperature range of -40°C to 85°C.

9. Capacitor and Resistor Selection:

   • Choose appropriate values for the external capacitor and resistor to achieve the desired timing period.
   • The formula for the timing period in astable mode is: [ T = 0.693 times (R_1 + 2R_2) times C ]
   • For monostable mode: [ T = 1.1 times R times C ]

10. Decoupling Capacitor:

    • Place a 0.1μF decoupling capacitor between V_CC and GND close to the IC to reduce noise and improve stability.

By following these instructions, you can effectively use the ICM7555ISA in your circuits.

(For reference only)