Details

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BUY 5555 https://www.utsource.net/itm/p/12611186.html

Parameter	Description	Value/Range
Part Number	The specific identifier for this component	5555
Type	Type of IC	Timer/Controller
Function	Primary function of the IC	Monostable/Multivibrator
Supply Voltage (Vcc)	Operating voltage range	4.5V to 16V
Output Current	Maximum output current the IC can source or sink	200mA
Trigger Input (Vtr)	Voltage level that triggers the timer	1/3 Vcc
Threshold Input (Vth)	Voltage level that resets the timer	2/3 Vcc
Discharge Pin	Used to discharge the timing capacitor	Open Collector
Operating Temperature	Temperature range in which the IC can operate reliably	-40掳C to +85掳C
Power Dissipation	Maximum power dissipation	600mW
Quiescent Current	Current drawn by the IC when not active	3mA (typical)
Output Voltage Swing	Range of output voltage levels	0V to Vcc - 1.5V
Package	Physical package type	DIP-8, SOIC-8

Instructions for Use

1. Pin Configuration:

   • Pin 1 (GND): Ground reference.
   • Pin 2 (TRIG): Trigger input; a low pulse here starts the timing cycle.
   • Pin 3 (OUT): Output pin; provides the output signal.
   • Pin 4 (RESET): Reset input; a low pulse here resets the timer.
   • Pin 5 (CTRL): Control voltage input; used to adjust the threshold voltage.
   • Pin 6 (THRES): Threshold input; determines the end of the timing cycle.
   • Pin 7 (DISCH): Discharge pin; used to discharge the external capacitor.
   • Pin 8 (Vcc): Positive supply voltage.

2. Monostable Mode:

   • Connect a resistor (R) between Vcc and Pin 7 (DISCH).
   • Connect a capacitor (C) between Pin 6 (THRES) and GND.
   • Apply a low pulse to Pin 2 (TRIG) to start the timing cycle.
   • The output (Pin 3) will remain high for a time period ( T = 1.1 times R times C ).

3. Astable Mode:

   • Connect a resistor (R1) between Vcc and Pin 7 (DISCH).
   • Connect another resistor (R2) between Pin 7 (DISCH) and Pin 6 (THRES).
   • Connect a capacitor (C) between Pin 6 (THRES) and GND.
   • The output (Pin 3) will oscillate with a frequency ( f = frac{1.44}{(R1 + 2R2) times C} ).

4. Power Supply:

   • Ensure the supply voltage (Vcc) is within the specified range (4.5V to 16V).
   • Use a decoupling capacitor (e.g., 0.1渭F) between Vcc and GND close to the IC to filter out noise.

5. Reset Function:

   • A low signal on Pin 4 (RESET) will immediately reset the timer, regardless of the state of other inputs.

6. Control Voltage:

   • Pin 5 (CTRL) can be used to adjust the threshold voltage, allowing for precise control of the timing cycle. If not used, it should be bypassed to GND with a 10nF capacitor to avoid noise interference.

7. Output Load:

   • The output can drive loads up to 200mA. For higher currents, use a transistor or other driver circuit.

8. Temperature Considerations:

   • Ensure the operating temperature is within the specified range (-40掳C to +85掳C) to maintain reliable operation.

(For reference only)