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Thread: logic gate speeds
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face BY : Ted Mawson email (remove spam text)



The maximum clock speed I understand that a PIC can count at is 50 MHz - correct?

I want to count at higher frequencies - up to 500 MHz and I'm looking to use a logic counter to divide 500 by 16 and give an input frequency into the PIC of  500/16 = 31.25 MHz.

There's a 7400 series chip, the 74F161 that divides by 16 but the max i/p frequency is 100 MHz.  Are there any 7400 series other than F that can go faster or any equivalents that y'all know of?

Can anyone point me to a counter, ideally pre-settable and with accessible (to read) outputs, that could take a clock input for counting faster than 100 MHz and divide by 16?

Ted Mawson
RemoveMEPICman.....spam.....portfoliopm.com

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