I am doing the DC analysis of my Ethernet interface.

Interfacing SAMA5D2 with FS32K148HAT0MLUT. This is a mac to mac communication.

In the datasheet of FS32K148HAT0MLUT Voh(min) value is not available. From the GPIO spec:

I believe Voh(max) of FS32K148HAT0MLUT is VDD-0.8.

May I know where I can get the Voh(min) of FS32K148HAT0MLUT.

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  • 1
    \$\begingroup\$ Why do you believe VDD-0.8V is Voh(max)? It would mean for logic high all values up to VDD-0.8V are possible and values above VDD-0.8V are not possible. What sense that would make? \$\endgroup\$
    – Justme
    May 31 at 10:12
  • \$\begingroup\$ That is from the uC datasheet page no 32 ,Table 20 row 6 \$\endgroup\$
    – Hari
    May 31 at 10:22
  • \$\begingroup\$ I can see that, but you don't answer my question. \$\endgroup\$
    – Justme
    May 31 at 10:25
  • \$\begingroup\$ Voh(Max) can come upto Vdd \$\endgroup\$
    – Hari
    May 31 at 10:31

1 Answer 1


A datasheet can specify either the minimum VOH at a certain test current, or the minimum IOH at a certain test voltage.

The FS32K148HAT0MLUT datasheet uses the second choice. That test voltage (VDD − 0.8 V) indeed is VOH(min).

(And you should run both chips at 3.3 V.)


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