Seagate ST373307FC, ST3146807FC, ST336607FC manual Differential Pecl input, Transmit eye diagram

Cheetah 10K.6 FC Product Manual, Rev. B 61

9.6.3Differential PECL output

The serial PECL output signal voltage characteristics are provided in Table 27. 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 27: Differential PECL output characteristics

Description	Parameter
Serial output voltage swing	600 < Vout < 1300 mV

Figure 24 provides the data output valid eye diagram relative to the bit cell time. Table 29 lists the data values.

Bit Time

Vout (mv)

XMIT Eye

Figure 24. Transmit eye diagram

9.6.4Differential PECL input

The serial PECL input signal voltage characteristics are provided in Table 28.

Table 28:	Differential PECL input characteristics
Description		Parameter	Notes
Serial input voltage swing		400 < Vin < 2.000 mV	AC coupled

Figure 25 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 29 lists the data values.

Vin (mv)

Bit Time

RCV Eye

(typical)

(minimum)

Figure 25. Receive eye diagram