str912 voltages levels (CMOS/TTL)

[r_lghoul]

Posted on April 14, 2008 at 13:47

str912 voltages levels (CMOS/TTL)

[r_lghoul]

Posted on May 17, 2011 at 09:52

Hi every body,

is it possible to connect STR912 I/Os to low voltage CMOS interface (exemple SPI), and TTL interface (exemple UART),please advise

:)

[kais]

Posted on May 17, 2011 at 09:52

Hi,

As you know the VDDQ voltage range in STR9 is from 2.7 to 3.6V

Referring to STR9 datasheet:

-VIH= 2.0v

-VIL= 0.8v

-VOH = VDDQ – 0.7

-VOL = 0.4v

To be TTL Compliant :

you must have VDDQ – 0.7 >= 2.4V

So VDDQ >=3.1v

Kind regards,

Eris.