VSC8541-01 datasheet(78/100 Pages) MICROSEMI

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Electrical Specifications

VMDS-10496 VSC8541-01 Datasheet Revision 4.2

5.2.1.1

XTAL Reference Clock

When using the 25 MHz crystal clock input option (REFCLK_SEL[1:0] = 00), the additional specifications

listed in the following table are required.

5.2.2

Recovered Clock

This section provides the AC characteristics for the recovered clock output signal. The following table

shows the AC specifications for the RCVRD_CLK output.

REFCLK frequency,

REFCLK_SEL[1:0]= 01

–100 ppm 25

100 ppm

MHz

Rise time and fall time

tR, tF

1.5

20% to 80%, 5.1 pF load

Duty cycle

Phase jitter—Gaussian

psRMS Bandwidth from 10 kHz to 10 MHz

Total jitter, peak-to-peak

200

psPP

10K samples.

Table 99 •

XTAL RefClk

Parameter

Symbol

Minimum

Typical

Maximum

Unit

CL1

where

C1EXT =C1 +CINEXT

C2EXT = C2 + COUTEXT

CINEXT represents input (XTAL1) I/O, bond pad, package pin, and routing parasitic

capacitance

and COUTEXT represents output (XTAL2) I/O, bond pad, package pin, and routing parasitic

capacitance.

For a reference tank circuit, see Figure 10, page 14.

8pF

Crystal ESR

Ω

Table 100 •

Recovered Clock AC Characteristics

Parameter

Symbol

Minimum

Typical Maximum

Unit Condition

Recovered clock frequency

125

MHz

Recovered clock frequency

31.25

MHz

Recovered clock frequency

MHz

Recovered clock cycle time

tRCYC

8ns

Recovered clock cycle time

tRCYC

Recovered clock cycle time

tRCYC

Frequency stability

ƒSTABILITY

ppm

Duty cycle

Clock rise time and fall time

tR, tF

1.2

20% to 80%

Table 98 •

RefClk (continued)

Parameter

Symbol

Minimum

Typical

Maximum

Unit

Condition

C1EXT C2EXT

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