ICS84327AMT View Datasheet(PDF) - Integrated Circuit Systems
Part Name
Description
MFG CO.
ICS84327AMT
Integrated Circuit Systems
'ICS84327AMT' PDF : 15 Pages View PDF
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84327
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
GENERAL DESCRIPTION
The ICS84327 is a Crystal-to-3.3V LVPECL
,&6
Clock Synthesizer/Fanout Buffer designed for
HiPerClockS™ SONET, 10 Gigabit Fibre Channel and 10 Giga-
bit Ethernet applications and is a member of the
HiperClockS family of High Performance Clock
Solutions from ICS. The output frequency can be set using
the frequency select pins and a 19.44MHz crystal for SONET
frequencies, or a 25MHz crystal for 10 Gigabit Ethernet fre-
quencies, or a 25.5MHz crystal for a 10 Gigabit Fibre Chan-
nel. The low phase noise characteristics of the ICS84327 make
it an ideal clock for these demanding applications.
FUNCTION TABLE
Inputs
F_XTAL MR
X
1
19.44MHz 0
19.44MHz 0
19.44MHz 0
19.44MHz 0
25MHz 0
25MHz 0
25MHz 0
25MHz 0
25.5MHz 0
SEL2
X
1
1
1
1
0
0
0
0
0
SEL1
X
0
0
1
1
0
0
1
1
0
SEL0
X
0
1
0
1
0
1
0
1
1
Output
Frequency
F_OUT
LOW
77.76MHz
155.52MHz
311.04MHz
622.08MHz
78.125MHz
156.25MHz
312.5 MHz
625MHz
159.375MHz
FEATURES
• 6 LVPECL outputs
• Crystal oscillator interface
• Output frequency range: 77.76MHz to 625MHz
• Crystal input frequency: 19.44MHz, 25MHz or 25.5MHz
• RMS phase jitter at 155.52MHz, using a 19.44MHz crystal
(12KHz to 20MHz): 3.4ps (typical)
Phase noise:
Offset
Noise Power
100Hz .................. -92 dBc/Hz
1KHz ................ -105 dBc/Hz
10KHz ................ -122 dBc/Hz
100KHz ................ -123 dBc/Hz
• Full 3.3V or 3.3V core, 2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL1
XTAL2
OSC
PLL
0
Output
/6 Q0:Q5
1
Divider
/6 nQ0:nQ5
Feedback
Divider
F_SEL2 MR PLL_SEL F_SEL1
F_SEL0
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
18 F_SEL2
1 7 VCCA
16 VCC
15 PLL_SEL
1 4 VEE
1 3 VCCO
ICS84327
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
84327AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 18, 2003
1
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