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Si840x
3.4. Input and Output Characteristics for Non-I 2 C Digital Channels
The Si84xx inputs and outputs for unidirectional channels are standard CMOS drivers/receivers. The nominal
output impedance of an isolator driver channel is approximately 85 ? , ±40%, which is a combination of the value of
the on-chip series termination resistor and channel resistance of the output driver FET. When driving loads where
transmission line effects will be a factor, output pins should be appropriately terminated with controlled impedance
PCB traces. Table 12 details powered and unpowered operation of the Si84xx’s non-I 2 C digital channels.
Table 12. Si84xx Operation Table
V I Input 1,2 VDDI State 1,3,4 VDDO State 1,3,4 V O Output 1,2
Comments
H
L
X 5
P
P
UP
P
P
P
H
L
L 6
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. X = not applicable; H = Logic High; L = Logic Low.
3. Powered (P) state is defined as 3.0 V < VDD < 5.5 V.
4. Unpowered (UP) state is defined as VDD = 0 V.
5. Note that an I/O can power the die for a given side through an internal diode if its source has adequate current.
6. For I 2 C channels, the outputs for a given side go to Hi-Z when power is lost on the opposite side.
Rev. 1.6
15
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