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Altera_Forum
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16 years ago

MAX3000 CPLD bi-directional I/O with 5V pull-up

Hi How would I create a bi-directional pin with open-collector output on a MAX3000 CPLD? I have started the design with an open collector driver driving the pin and a 541 type buffer fo...
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Altera_Forum
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16 years ago

It's basically correct. If Quartus doesn't accept the parallel connection of open drain driver and input to the bidirectional pin (it generally works in HDL entry), you can place bidir instead of open drain IO elements.