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9.6.2
LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 27 for the output character-
istics of the LED drive signals.
Table 27:
LED drive signal
State
LED off, high
LED on, low
9.6.3
FC Differential output
The serial output signal voltage characteristics are provided in Table 28. The outputs are not AC coupled in
order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to iso-
late potentially different DC characteristics of the outputs and the receiver.
Table 28:
FC Differential output characteristics
Description
Serial output voltage swing
Figure 13 provides the data output valid eye diagram relative to the bit cell time.
Figure 13.
Transmit eye diagram
9.6.4
FC Differential input
The serial input signal voltage characteristics are provided in Table 29.
Table 29:
FC Differential input characteristics
Description
Serial input voltage swing
Cheetah NS FC Product Manual, Rev. A
Current drive available
0 < I
< 100µA
OH
I
< -30 mA
OL
Parameter
600 < V
< 1300 mV
out
Bit Time
XMIT Eye
Parameter
200 < V
< 1.300 mV
in
Output voltage
0 < V
< 0.8V
OL
Notes
Centered at 1.32V
Notes
AC coupled
69
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