VSC7440 datasheet(396/444 Pages) MICROSEMI

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Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

379

6.2.2

PLL Clock Outputs

The following table lists the AC specifications for the PLL outputs. Applies to the CLKOUTPLL and

CLKOUTPLL2 pins.

6.2.3

SERDES1G

This section describes the AC specifications for the SERDES1G transceiver. The transceiver supports

100BASE-FX, SFP, 1000BASE-KX, and SGMII modes.

The following table lists the AC characteristics for the 1G transmitter. Applies to S[4:0]_TXN/P pins.

The following table lists AC characteristics for the 1G receiver. Applies to the S[4:0]_RXN/P pins.

Table 290 •

PLL Clock Outputs

Parameter

Symbol

Minimum

Maximum

Unit

Condition

Output frequency

625

MHz

Clock duty cycle

Measured at 50% threshold

Rise time and fall time

tR, tF

100

300

20% to 80% of VS

Intrapair skew

tSKEW

100

Jitter generation, 10 kHz to

50 MHz

4psRMS Jitter-free input used for

REFCLK/REFCLK2

Table 291 •

100BASE-FX, SGMII, SFP, 1000BASE-KX Transmitter

Parameter

Symbol

Minimum

Maximum

Unit

Condition

Data rate

125 – 100 ppm

125 + 100 ppm

Mbps

100BASE-FX.

Data rate

1.25 – 100 ppm

1.25 + 100 ppm

Gbps

SGMII, SFP, 1000BASE-KX.

Differential output return

loss

RLOSDD22

–10

50 MHz to 625 MHz.

Differential output return

loss

RLOSDD22

–10 + 10 x log

(ƒ/625 MHz)

625 MHz to 1250 MHz.

Rise time and fall time1

Slew rate is programmable.

tR, tF

300

20% to 80%.

Interpair skew

tSKEW

Deterministic jitter

Measured according to

IEEE 802.3 Clause 38.5.

Total jitter

192

Measured according to

IEEE 802.3 Clause 38.5.

Wideband SyncE jitter

WJT

0.5

UIP-P

Measured according to ITU-T

G.8262, section 8.3.

Table 292 •

100BASE-FX, SGMII, SFP, 1000BASE-KX Receiver

Parameter

Symbol

Minimum

Maximum

Unit

Condition

Data rate

125 – 100 ppm

125 + 100 ppm

Mbps

100BASE-FX.

Data rate

1.25 – 100 ppm

1.25 + 100 ppm

Gbps

SGMII, SFP, 1000BASE-KX.

Differential input return loss RLISDD11

–10

50 MHz to 625 MHz.

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