VSC8541XMV-05 datasheet(77/101 Pages) MICROCHIP

77 / 101 page

Electrical Specifications

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

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.

The following illustration shows the test circuit for the CLKOUT, RCVRD_CLK, and RMII_CLKOUT

outputs.

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%

Peak-to-peak jitter, copper media interface,

1000BASE-T, slave mode

JPPCLK_Cu

400

10k samples.

Table 98 •

RefClk (continued)

Parameter

Symbol

Minimum

Typical

Maximum

Unit

Condition

C1EXT C2EXT

-----------------------------------------

VSC8541XMV-05 Datasheet(PDF) 77 Page - Microchip Technology

VSC8541XMV-05 Datasheet(HTML) 77 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL