ICS650-47 Datasheet, PDF (6/10 Pages) Integrated Circuit Systems – Spread Spectrum Clock Synthesizer

P R E L I M I N A RY I N F O R M AT I O N
ICS650-47
Spread Spectrum Clock Synthesizer
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, VDDO = 2.5 V ±5%, Ambient Temperature 0 to +85° C
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Input Frequency
Spread Spectrum Modulation
Frequency
F_IN Crystal or clock input
25
MHz
50
kHz
Duty Cycle
t₂/t₁ At VDD/2, Note 1 and 45
50
55
%
Figures 1 and 2
Output Fall Time
t₃
80% to 20%, Note 1
and Figures 1 & 3
1.5
ns
Output Rise Time
t₄
20% to 80%, Note 1
and Figures 1 & 3
1.5
ns
One Sigma Clock Period Jitter
Note 1
30
ps
Absolute Jitter, Peak-to-Peak
t_ja
Deviation from mean,
±125
ps
SS_EN=0, Note1 &
Figures 1 and 6
Output Enable Time
t_EN PDTS high to PLL
locked to within 1% of
final value, Figure 5
2.5
5
ms
Output Disable Time
t_DIS PDTS low to tri-state,
20
ns
Figure 5
Power-up Time
t_P
PLL lock-time from
power-up to 1% of final
value, Figure 4
6
10 ms
Note 1: Measured with 15 pF load.
MDS 650-47 B
6
Revision 082305
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