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CY28800
Document #: 38-07723 Rev *B
Page 9 of 16
Output Enable Clarification
OE functionality allows for enabling and disabling individual
outputs. OE_[7:0] are Active High or Active Low inputs
depending on the strapped value of the OE_INV input.
Disabling the outputs may be implemented in two ways, via
writing a ‘0’ to SMBus register bit corresponding to output of
interest or by deasserting the OE input pin. In both methods,
if SMBus registered bit has been written low or the OE pin is
deasserted or both, the output of interest will be tri-stated. (The
assertion and deassertion of this signal is absolutely
asynchronous.)
DIFC (Stoppable)
DIFT (Stoppable)
DIFC(Free Running
DIFT(Free Running
PWRDWN
1 ms
SRC_STP
Figure 9. SRC_STP = Driven, PWRDWN = Driven, OE_INV = 1
DIFC (Stoppable)
DIFC(Free Running
DIFT(Free Running
PWRDWN
1 ms
SRC_STP
DIFT (Stoppable)
Figure 10. SRC_STP = Tri-state, PWRDWN = Driven, OE_INV = 1
DIFC(Free Running
DIFT(Free Running
DIFT (Stoppable)
DIFC (Stoppable)
PWRDWN
1 ms
SRC_STP
Figure 11. SRC_STP = Tri-state, PWRDWN = Tri-state, OE_INV = 1
Table 6. OE Functionality
OE_INV
OE (Pin)
OE (SMBus Bit)
DIF[T/C]
0
0
0
Tri-State
0
0
1
Tri-State
0
1
0
Tri-State
0
1
1
Enabled
1
0
0
Tri-State
1
0
1
Enabled
1
1
0
Tri-State
1
1
1
Tri-State
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