ICS281 Datasheet, PDF (6/8 Pages) Integrated Circuit Systems – Triple PLL Field Prog. Spread Spectrum Clock Synthesizer

PRELIMINARY INFORMATION
ICS281
Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Conditions
Min.
Input Frequency
F_IN Fundamental crystal
5
Clock input
3
Output Frequency
VDDO=VDD
0.314
1.8 V<VDDO<2.8 V
0.314
Output Rise/Fall Time
t_OF 80% to 20%, high drive,
Note 1
Output Rise/Fall Time
t_OF 80% to 20%, low drive,
Note 1
Output Rise/Fall Time
t_OF 80% to 20%, high drive,
1.8 V<VDDO<2.8
Note 2
Duty Cycle
Note 2
40
Output Frequency Synthesis Error
Configuration Dependent
Power-up Time
PLL lock-time from
power-up
PDTS goes high until
stable CLK output,
Spread Spectrum Off
PDTS goes high until
stable CLK output,
Spread Spectrum On
One Sigma Clock Period Jitter
Configuration Dependent
Maximum Absolute Jitter
t_ja Deviation from Mean.
Configuration Dependent
Typ.
1.0
2.0
2.0
49-51
TBD
4
0.6
4
50
+200
Max.
27
166
200
150
60
10
2
7
Units
MHz
MHz
MHz
MHz
ns
ns
ns
%
ppm
ms
ms
ms
ps
ps
Note 1: Measured with 15 pF load.
Note 2: Duty Cycle is configuration dependent. Most configurations are min 45% / max 55%.
Thermal Characteristics
Parameter
Symbol Conditions
Thermal Resistance Junction to
Ambient
θ_JA Still air
θ_JA 1 m/s air flow
θ_JA 3 m/s air flow
Thermal Resistance Junction to Case θ_JC
Min.
Typ.
78
70
68
37
Max.
Units
°C/W
°C/W
°C/W
°C/W
MDS 281 C
6
Revision 062205
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