User guide

WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 35
Fastrack Xtend User Guide
Interfaces
Figure 8. Equivalent Circuit of V
IH
, Vref = 2.8V
Figure 9. Equivalent Circuit of V
OL
, Vref = 2.8V
Figure 10. Equivalent Circuit of V
OH
, Vref = 2.8V
With Vref > 2.8V, both GPIO21 and GPIO25 may be interfaced with a component that complies with
the following levels.
Table 11. GPIO Pin Operating Conditions when Vref > 2.8V
Parameter
Min
Typ
Max
Condition
V
IL
0.84V
Please refer to Figure 11.
V
IH
1.96V
Please refer to Figure 12.