Seagate Cheetah 15K Cheetah 15K.5 FC Product Manual - Page 80
LED driver signals, FC Differential output, FC Differential input
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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 29 for the output characteristics of the LED drive signals. Table 29: LED drive signal State LED off, high LED on, low Current drive available 0 < IOH < 100µA IOL < -30 mA Output voltage 0 < VOL < 0.8V 9.6.3 FC Differential output The serial output signal voltage characteristics are provided in Table 30. 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 30: FC Differential output characteristics Description Serial output voltage swing Parameter 600 < Vout < 1300 mV Notes Centered at 1.32V Figure 18 provides the data output valid eye diagram relative to the bit cell time. Bit Time Vout (mv) Figure 18. XMIT Eye Transmit eye diagram 9.6.4 FC Differential input The serial input signal voltage characteristics are provided in Table 31. Table 31: FC Differential input characteristics Description Serial input voltage swing Parameter 200 < Vin < 1.300 mV Notes AC coupled 72 Cheetah 15K.5 FC Product Manual, Rev. F