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SM843251-156 Datasheet, PDF (4/7 Pages) Micrel Semiconductor – ClockWorks™ 10-Gigabit Ethernet, 156.25MHz, Ultra-Low Jitter LVPECL Clock Frequency Synthesizer
Micrel, Inc.
SM843251-156
AC Electrical Characteristics(5)
VDD = VDDA = 2.5V ±5% or 3.3V ±5%, TA = –40°C to +85°C, unless noted.
Symbol Parameter
Condition
Min. Typ. Max. Units
FOUT
Output Frequency
25MHz Crystal
156.25
MHz
tJITTER
RMS Phase Jitter (Output = 156.25 MHz)
Integration Range: 1.875MHz to 20MHz
110
fs
tR / tF
Output Rise/Fall Time
20% to 80%
80
175
350
ps
ODC
Output Duty Cycle
48
50
52
%
Note:
5. The circuit is designed to meet the AC specifications shown in the above table(s) after thermal equilibrium has been established with a transverse
airflow greater than 500 lfpm.
Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
Condition
12pF Load
Min.
Typ.
Max.
Fundamental, Parallel Resonant
25
50
3
7
100
300
Units
MHz
Ω
pF
uW
October 2010
4
M9999-100110-A
hbwhelp@micrel.com or (408) 955-1690