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Altera_Forum
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13 years ago

specifications of external clock signal DE2 Board and Starter Development Board

Hi, im trying to synchronize a comunication system with a 10MHz clock, for that, I'm using a PLL IC (MM74HC4046), then the main issue is that this IC gives 5 Volts signal, and after research of my bo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I've seen the datasheet of the FPGA, and it says that voltage accepted by the pins depends on the duty cycle of the signal (DC 4.0V, 10% duty Cycle 4.5V).

I dont see the minimun voltaje level for a HIGH, but If it dont work I'll just decrease the serial resistor to get more than 2.5V

Thanks for the advice