ICS84325 データシートの表示（PDF） - Integrated Circuit Systems
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ICS84325 Datasheet PDF : 15 Pages
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Integrated
Circuit
Systems, Inc.
ICS84325
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER WITH FANOUT BUFFER
GENERAL DESCRIPTION
ICS
The ICS84325 is a Crystal-to-3.3V LVPECL
Frequency Synthesizer with Fanout Buffer and a
HiPerClockS™ member of the HiPerClockS™ family of High
Performance Clock Solutions from ICS. The
output frequency can be programmed using
frequency select pins. The low phase noise characteristics
of the ICS84325 make it an ideal clock source for Fibre
Channel 1, Fibre Channel 2, Infiniband and Gigabit
Ethernet applications.
FUNCTION TABLE
Inputs
XTAL Output Frequency
MR F_SEL1 F_SEL0
F_OUT
1
X
X
LOW
0
0
0
25.5MHz
106.25MHz
0
0
1 25.5MHz
212.5MHz
0
1
0
25MHz
125MHz
0
1
1
25MHz
250MHz
FEATURES
• 6 differential 3.3V LVPECL outputs
• Crystal oscillator interface
• Output frequency range: 106.25MHz to 250MHz
• Crystal input frequency: 25MHz and 25.5MHz
• Output skew: 60ps (maximum)
• RMS phase jitter at 212.5MHz, using a 25.5MHz crystal
(637KHz to 10MHz): 2.76ps
• Phase noise: Typical at 212.5MHz
Offset
Noise Power
100Hz ................. -92 dBc/Hz
1KHz ................. -112 dBc/Hz
10KHz ................. -120 dBc/Hz
100KHz ................. -122 dBc/Hz
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Lead-Free package available.
• Industrial temperature information available upon request
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL1
XTAL2
OSC
PLL
Feedback
Divider
F_SEL1 MR
0
Output
/6 Q0:Q5
1
Divider
/6 nQ0:nQ5
Q0 1
nQ0 2
Q1 3
nQ1 4
Q2 5
nQ2 6
Q3 7
nQ3 8
Q4 9
nQ4 10
Q5 11
nQ5 12
2 4 VCCO
23 F_SEL0
22 F_SEL1
21 MR
20 XTAL1
19 XTAL2
1 8 VEE
1 7 VCCA
16 VCC
15 PLL_SEL
1 4 VEE
1 3 VCCO
PLL_SEL
F_SEL0
ICS84325
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M Package
Top View
84325EM
www.icst.com/products/hiperclocks.html
1
REV. B OCTOBER 11, 2004
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