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Altera_Forum
Honored Contributor I
1,045 Views

about MAX V open drain output maximum voltage

Hi, 

 

Where can I find info about MAX V open drain output max. voltage value? 

Can I drive directy LED ( 3,2V drop voltage at 10 mA) from MAX V open drain output if the LED Anode connected to the +5V power supplier via 150 Ohm resistor ( I assume the output transistor sauraion votage's 0,4V as datasheet says).? 

During LED off state 5V will be applied to the output transistor drain. Is it OK? 

 

BR
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2 Replies
Altera_Forum
Honored Contributor I
72 Views

No. You can't connect an LED directly to the pin in this way. Refer to the 'max v datasheet (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/max-v/mv51003.pdf)'. Absolute max on a pin is 4.6V let alone the recommended operating conditions of 3.6V max. 

 

Use an external transistor or FET if you want to operate at 5V. 

 

Cheers, 

Alex
Altera_Forum
Honored Contributor I
72 Views

Thanks for the info.

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