Led Driver Signals; Fc Differential Output - Seagate Cheetah ST3450657FC Product Manual

11.6.2 LED driver signals

Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 30 for the output characteristics of the
LED drive signals.
Table 30 LED drive signal
S
TATE
LED off, high
LED on, low

11.6.3 FC Differential output

The serial output signal voltage characteristics are provided in Table 31. 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 isolate potentially different DC
characteristics of the outputs and the receiver.
Table 31 FC Differential output characteristics
D
ESCRIPTION
Serial output voltage swing
Figure 16 provides the data output valid eye diagram relative to the bit cell time.
Figure 16. Transmit eye diagram
C 15K.7 FC P
HEETAH RODUCT
C
URRENT DRIVE AVAILABLE
0 < I < 100μA
OH
I < -30 mA
OL
P N
ARAMETER
600 < V < 1300 mV
out
Bit Time
XMIT Eye
M , R . E
ANUAL EV
O
UTPUT VOLTAGE
0 < V < 0.8V
OL
OTES
Centered at 1.32V
64