VSC7440 datasheet(399/444 Pages) MICROSEMI

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Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

382

The following table lists the AC characteristics for the 6G transmitter operating in PCIe mode. Applies to

the PCIE_TXN/P pins.

The following table lists the AC characteristics for the 6G receiver operating in PCIe mode. Applies to the

PCIE_RXN/P pins.

Wideband SyncE jitter

tolerance

WJT

312.5

UIP-P

10 Hz to 12.1 Hz.

Measured according to ITU-T

G.8262, section 9.2.

Wideband SyncE jitter

tolerance

WJT

3750/ƒ

UIP-P

12.1 Hz to 2.5 kHz (ƒ).

Measured according to ITU-T

G.8262, section 9.2.

Wideband SyncE jitter

tolerance

WJT

1.5

UIP-P

2.5 kHz to 50 kHz.

Measured according to ITU-T

G.8262, section 9.2.

Jitter requirements represent high-frequency jitter (above 637 kHz) and not low-frequency jitter or wander.

Table 295 •

PCIe Transmitter

Parameter

Symbol

Minimum

Typical Maximum

Unit

Condition

Data rate

2.5 – 300 ppm

2.5 + 300 ppm Gbps

Differential output return

loss

RLOSDD22

–10

50 MHz to 1.25 GHz

Common-mode return

loss

RLOSCC22

–6

50 MHz to 1.25 GHz

De-emphasized

differential output

voltage (ratio)

Tode

–3

–3.5

–4

Rise time and fall time1

Slew rate is programmable. Configure accordingly for compliance to supported standard.

tR, tF

20% to 80%.

Recommended value.

Total jitter

0.25

UIP-P

Differential amplitude

VTX_DIFF_PP

8002

Compatibility to supported standard requires VDD_VS = 1.2 V supply for driver.

1200

mVP-P

Table 296 •

PCIe Receiver

Parameter

Symbol

Minimum

Maximum

Unit

Condition

Data rate

2.5 – 300 ppm

2.5 + 300 ppm

Gbps

Differential input return loss

RLISDD11

–10

50 MHz to 1.25 GHz.

Common-mode return loss

RLISCC11

–6

80 MHz to 1.25 GHz.

Total jitter tolerance

0.60

UIP-P

Eye mask

R_X1

0.30

Eye mask

R_X2

0.70

Eye mask

R_Y1

Eye mask

R_Y2

600

Table 294 •

100BASE-FX, SGMII, SFP, 2.5G, 1000BASE-KX Receiver (continued)

Parameter

Symbol

Minimum

Maximum

Unit

Condition

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