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ICS843246AM

Description
FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
File Size194KB,15 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS843246AM Overview

FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843246
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-3.3V LVPECL
F
REQUENCY
S
YNTHESIZER W
/I
NTEGRATED
F
ANOUT
B
UFFER
F
EATURES
Six LVPECL outputs
Crystal oscillator interface
Output frequency range: 53.125MHz to 333.3333MHz
Crystal input frequency range: 25MHz to 33.333MHz
RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz to 20MHz):
0.41ps
(typical)
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
Available in both standard and lead-free RoHS-compliant
packages
Function
G
ENERAL
D
ESCRIPTION
The ICS843246 is a Crystal-to-3.3V LVPECL
Clock Synthesizer/Fanout Buffer designed for
HiPerClockS™
Fibre Channel and Gigabit Ethernet appli-
cations and is a member of the HiperClockS™
family of High Performance Clock Solutions
from ICS. The output frequency can be set using the fre-
quency select pins and a 25MHz crystal for Ethernet
frequencies, or a 26.5625MHz crystal for a Fibre Channel.
The low phase noise characteristics of the ICS843246
make it an ideal clock for these demanding applications.
IC
S
S
ELECT
F
UNCTION
T
ABLE
Inputs
FB_SEL
0
0
0
0
1
1
1
1
N_SEL1
0
0
1
1
0
0
1
1
N_SEL0
0
1
0
1
0
1
0
1
M Divide
20
20
20
20
24
24
24
24
N Divide
2
4
5
8
3
4
6
12
M/N
10
5
4
2.5
8
6
4
2
B
LOCK
D
IAGRAM
Q0
nQ0
PLL_BYPASS
Pullup
P
IN
A
SSIGNMENT
V
CCO
V
CCO
nQ2
Q2
nQ1
Q1
nQ0
Q0
PLL_BYPASS
V
CCA
V
CC
FB_SEL
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Q3
nQ3
Q4
nQ4
Q5
nQ5
N_SEL1
V
EE
V
EE
N_SEL0
XTAL_OUT
XTAL_IN
Q1
1
XTAL_IN
XTAL_OUT
nQ1
OSC
PLL
0
Output
Divider
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Feedback
Divider
FB_SEL
N_SEL1
N_SEL0
Pulldown
Pullup
Pullup
ICS843246
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm
body package
M Package
Top View
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
body package
G 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.
843246AM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 29, 2005
1

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Description FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
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