May 2008

ASM3P2187A/B

rev 0.2

Spread Spectrum Clock Generator for Mobile Applications

4 of 9

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

DC Electrical Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Input low voltage

VSS – 0.3

0.8

V

Input high voltage

2.0

VDD+ 0.3

V

Input low current

-50

µA

Input high current

+50

µA

Output low voltage

VSS

0.4

V

Output high voltage

2.4

VDD

V

Dynamic supply current (Unloaded Outputs)

17

mA

Static supply current standby mode

(CLKIN/XIN pulled LOW)

8

mA

VDD

Operating voltage

3.3

3.3

3.6

V

Power up time (first locked clock cycle after power up)

2

5

mS

Clock output impedance

50

Ω

Input Capacitance

7

pF

Load Capacitance

15

pF

AC Electrical Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

CLKIN/XIN

Input Clock frequency

12.5

15

20

MHz

REFOUT

12.5

15

20

CLKOUT

Output Clock

frequency

ModOUT

50

60

80

MHz

Modulation Frequency

32.4

39

52

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 (REFOUT)

±150

±200

pS

Output duty cycle

45

50

55

%