Multisim and Ultiboard

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Multisim Oscilloscope showing wrong value rise time for comparator TLV3201

Hi, I created a PWM generating circuit in multisim for this purpose i have chosen 'Texas Instruments' TLV3201 comparator it has rise and fall time of near about 5ns. I verified it form TINA-TI software but in multisim simulation it's rise time appearing very significant(4 u Sec). My application require PWM of 50 kHZ with duty cycle from 0 to 100 %. But due significant rise time I cannot achieve precise duty cycle.I have tried other comparator also but issue remains same
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Please Find Attachment of schematic files and wave forms

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