5V Tolerant IOs

[abird]

Posted on June 29, 2006 at 09:29

5V Tolerant IOs

[abird]

Posted on May 17, 2011 at 09:30

Hi

The data sheet says that the general purpose IOs (section 2.23) are 5V tolerant, meaning ''... they can be driven safely by a voltage up to 5.5V''. But in Electrical Characteristics - Absolute maximum ratings (section 6.1) it says that Vin max is 4.0V, which is as I would expect if diodes are used on the inputs for ESD protection. The two pieces of information seem to conflict. Perhaps I have misunderstood? So, is it acceptable to drive the inputs from 5V logic in practice, or will this result in very high current usage or some other undesirable effects? Thanks, Andy

[shangdawei1]

Posted on May 17, 2011 at 09:30

i want to know too.

[abird]

Posted on May 17, 2011 at 09:30

UPDATE:

I received the following response from ST technical support: ''Hello, There is in fact some missing information in the data sheet - rev 1. I will send you by separate email the rev 2 of this data sheet ( see on table 8) We will update the Absolute Maximum table in the next version'' In the rev 2 data sheet, Table 8 ''DC Electrical Characteristics'' now has a note for VIH max for General Inputs that says ''Input pins are 5V tolerant, max input voltage is 5.5V''. VIH min is shown as 2.0V for General Inputs. So I think that the GPIO pins can be driven at 5.5V under normal operation. I guess the updated data sheet (rev 2) will be on the website in due course. Andy