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bc557 100khz frequency switching doubts

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raman00084

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from pic micro controller i am generating 100khz square wave signal. i am feeding the square wave to 6n136 optocoupler but the output of optocoupler is phase inverted in order to correct it i am using 557 transistor. my doubt is can i use 557 transistor for switching 100khz frequency is there any other way. i want to just optoisolate (separating two grounds) with the same phase of pic wave form.

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kalyan
 

Hi,

If you see the transistors datasheet its transition frequency is quoted a 100 Mhz Minimum so think as a simple inverter it will just about manage 100Khz.
 
Depends on your duty cycle requirements. You'll observe a certain asymmetry due to saturated switching.
 
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