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Altera_Forum's avatar
Altera_Forum
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16 years ago

Connect DE kit to TTL signal

Can anyone tell me how to connect DE kit to TTL signal. I need to connect the kit to rotary encoder,the voltage input of 2 slots(40 pins) in DE kit is 0-3.3V,the pulse which the encoder create is ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

DE-1 has no clamp diodes at GPIO pins, so the input voltage should be basically limited externally. A resistive divider can do as a simple solution, otherwise 3.3V logic devices with 5 V input capability, e.g. 74LVC or VHC family, can be used as level translator.