VSC8658 datasheet(74/95 Pages) MICROSEMI

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Electrical Specifications

VMDS-10242 VSC8658 Datasheet Revision 4.1

6.3

AC Characteristics

The AC specifications are grouped according to specific device pins and associated timing

characteristics.

6.3.1

Reference Clock Input

The following table shows the specifications for the reference clock input frequency including various

frequencies, duty cycle, and accuracy.

If using the 25 MHz crystal clock input option, the additional specifications in the following table are

required.

6.3.2

Clock Output

The specifications in the following table show the AC characteristics for the clock output of the VSC8658

device when used in your design.

Table 73 •

AC Characteristics for REFCLK Input

Parameter

Symbol

Minimum

Typical Maximum

Unit

Frequency with 25 MHz input

fCLK25

MHz

Frequency with 125 MHz input

fCLK125

125

MHz

Frequency accuracy

fTOL

100

ppm

Duty cycle

%DUTY

Rise time with 25 MHz input (20% to 80%)

tR25

4ns

Rise time with 125 MHz input (20% to 80%) tR125

1ns

Fall time with 25 MHz input (20% to 80%)

tR25

4ns

Fall time with 125 MHz input (20% to 80%)

tF125

1ns

Table 74 •

AC Characteristics for REFCLK Input with 25 MHz Clock Input

Parameter

Minimum

Typical

Maximum

Unit

Crystal parallel load capacitance

Crystal equivalent series resistance

Ω

Crystal accuracy

ppm

Table 75 •

AC Characteristics for the CLKOUT Pin

Parameter

Symbol

Minimum

Typical

Maximum

Unit Condition

CLKOUT frequency

fCLK125

125.00

156.25

MHz 125 MHz output clock

156.25 MHz output clock

CLKOUT cycle time

tCYC

8.0

6.4

125 MHz output clock

156.25 MHz output clock

Frequency stability

fSTABILITY

100

ppm

Duty cycle

%DUTY

Clock rise and fall times

(20% to 80%)

tR and tF

1ns

Total jitter

JCLK

217

491

Measured peak-to-peak

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