9

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03/31/15

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PI6C49021B

Low Power High Integration Clock Generator

and spread spectrum modulation.

8. Defined as the total variation of all crossing voltages of rising 100M+ and falling 100M–.

9. Refer to section 4.3.2.1 of the PCI Express Base Specification, Revision 1.1 for information regarding PPM considerations.

10. PPM refers to parts per million and is a DC absolute period accuracy specification. 1 PPM is 1/1,000,000th of 100 MHz exactly or 100 Hz. For 300 PPM there

is an error budget of 100Hz/PPM * 300 PPM = 30 kHz. The period is measured with a frequency counter with measurement window set at 100 ms or greater. With

spread spectrum turned off the error is less than ±300 ppm. With spread spectrum turned on there is an additional +2500 PPM nominal shift in maximum period

resulting from the -0.5% down spread.

Electrical Characteristics - 25MHz LVPECL outputs

Symbol

Parameter

Min

Typ

Max

Unit

Cycle Time

-

40

-

ns

Duty Cycle

45

-

55

%

Rise/Fall Time (20%-80%)

0.3

-

0.6

ns

RMS Jitter (12kHz-5 MHz)

-

-

2 (spur off) ps-RMS

Clock Tolerance (25MHz)

-50

-

+50

ppm

Output High Voltage

V

V

V

Output Low Voltage

V

V

Peak to Peak Output Voltage Swing

0.6

1.0

15-0042