May 2008

PCS3P2189A

rev 0.2

Spread Spectrum Clock Generator

4 of 7

Notice: The information in this document is subject to change without notice.

AC Electrical Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

XIN/CLKIN

Input Clock frequency

10

15

25

MHz

ModOUT

Output Modulated Clock frequency

40

60

100

MHz

Modulation Frequency

26

39

65

KHz

Output rise time ( Measured from 20% to 80% )

2

2.5

nS

Output fall time ( Measured from 80% to 20% )

1.5

2

nS

Cycle to Cycle Jitter

±250

±325

Period Jitter (With SSOFF)

±200

±250

pS

Output duty cycle

45

50

55

%

Typical Crystal Oscillator Circuit

Typical Crystal Specifications

Fundamental AT cut parallel resonant crystal

Nominal frequency

15MHz

Frequency tolerance

± 50 ppm or better at 25°C

Operating temperature range

-25°C to +85°C

Storage temperature

-40°C to +85°C

Load capacitance

18pF

Shunt capacitance

7pF maximum

ESR

25Ω

R1 = 510Ω

C1

C2