Si8410/20/21
2.3. Device Operation
Device behavior during start-up, normal operation, and shutdown is shown in Table 12.
Table 12. Si84xx Logic Operation Table
V I Input 1,4 VDDI State 1,2,3 VDDO State 1,2,3 V O Output 1,4
Comments
H
P
P
H
L
X 5
P
UP
P
P
L
L
Normal operation.
Upon transition of VDDI from unpowered to pow-
ered, V O returns to the same state as V I in less
than 1 μs.
X 5
P
UP
Upon transition of VDDO from unpowered to pow-
Undetermined ered, V O returns to the same state as V I within
1 μs.
Notes:
1. VDDI and VDDO are the input and output power supplies. V I and V O are the respective input and output terminals.
2. Powered (P) state is defined as 2.70 V < VDD < 5.5 V.
3. Unpowered (UP) state is defined as VDD = 0 V.
4. X = not applicable; H = Logic High; L = Logic Low.
5. Note that an I/O can power the die for a given side through an internal diode if its source has adequate current.
Rev. 1.5
19
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