CY28401
1mS
1mS
1mS
SRC_STOP#
PWRDWN#
DIFT(Free Running
DIFC(Free Running
DIFT (Stoppable)
DIFC (Stoppable)
Figure 5. SRC_STOP# =Driven, PWRDWN# = Three-state
SRC_STOP#
PWRDWN#
DIFT(Free Running
DIFC(Free Running
DIFT (Stoppable)
DIFC (Stoppable)
Figure 6. SRC_STOP# =Three-state, PWRDWN# = Driven
SRC_STOP#
PWRDWN#
DIFT(Free Running
DIFC(Free Running
DIFT (Stoppable)
DIFC (Stoppable)
Figure 7. SRC_STOP# =Three-state, PWRDWN# = Three-state
Output Enable Clarification
The OE function may be implemented in two ways, via writing
a ‘0’ to SMBus register bit corresponding to output of interest
or by asserting an OE input pin LOW. In both methods, if
SMBus registered bit has been written LOW or the OE pin is
LOW or both, the output of interest will be three-stated. (The
assertion and deassertion of this signal is absolutely
asynchronous.)
Table 6. OE Functionality
OE (Pin)#
OE (SMBus Bit)
DIFT
DIFC
Normal
Low
1
1
0
0
1
0
1
0
Normal
Three-state
Three-state
Three-state
Low
Low
Rev 1.0,November 21, 2006
Page 8 of 13
SPECTRALINEAR [ SPECTRALINEAR INC ]
