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Altera_Forum
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17 years ago

Cyclone3 Power Up level doesn't work

A design with an EP3C40F324I7 has the pin U18 as an registered output. This pin is used to control another dcdc's nSHDN (Shutdown negativ logic) The fpga is configured via epcs. this dcdc is ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

You can expect about 100 ohm output resistance at LVTTL3.3V 4 mA respectively 50 ohm at 8 mA. Additionally, the 4 mA setting causes current limit at about 18 mA.