Seagate ST373454FC Cheetah 15K.4 FC Product Manual - Page 84
LED driver signals, Differential PECL output, Differential PECL input
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9.6.2 LED driver signals Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector (J6). See Table 28 for the output characteristics of the LED drive signals. Table 28: 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 Differential PECL output The serial PECL output signal voltage characteristics are provided in Table 29. 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 29: Differential PECL output characteristics Description Serial output voltage swing Parameter 600 < Vout < 1300 mV Notes Centered at 1.32V Figure 22 provides the data output valid eye diagram relative to the bit cell time. 941 ps Vout (mv) Figure 22. 800 ps Transmit eye diagram 9.6.4 Differential PECL input The serial PECL input signal voltage characteristics are provided in Table 30. Table 30: Differential PECL input characteristics Description Serial input voltage swing Parameter 200 < Vin < 1.300 mV Notes AC coupled 72 Cheetah 15K.4 FC Product Manual, Rev. C