Seagate Cheetah 73LP FC ST336605FC, Product Manual

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58 Cheetah 73LP FC Product Manual, Rev. D
9.6.3 Differential PECL output
The serial PECL output signal voltage characteristics are provided in Table 26. 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.
Figure 20 provides the data output valid eye diagram relative to the bit cell time. Table 28 lists the data values.
Figure 20. Transmit eye diagram
9.6.4 Differential PECL input
The serial PECL input signal voltage characteristics are provided in Table 27.
Figure 21 provides the data valid eye diagram for typical and minimum requirements to recover data at the
specified interface error rate. The inputs are AC coupled on the drive. Table 28 lists the data values.
Figure 21. Receive eye diagram
Table 26: Differential PECL output characteristics
Description Parameter
Serial output voltage swing 600 < V
out
< 1300 mV
Table 27: Differential PECL input characteristics
Description Parameter Notes
Serial input voltage swing 400 < V
in
< 2.000 mV AC coupled
Bit Time
Vout (mv)
XMIT Eye
Bit Time
(typical)
RCV Eye
Vin (mv)
(minimum)