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PDF ICS844051I Data sheet ( Hoja de datos )
| Número de pieza | ICS844051I | |
| Descripción | CRYSTAL-TO- LVDS CLOCK GENERATOR | |
| Fabricantes | ICS | |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844051I is a Gigabit Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS.
The ICS844051I can synthesize 10 Gigabit
Ethernet, SONET, or Serial ATA reference clock
frequencies with the appropriate choice of crystal and output
divider. The ICS844051I has excellent phase jitter perfor-
mance and is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
FEATURES
• One Differential LVDS output
• Crystal oscillator interface designed for
18pF parallel resonant crystals (18.125MHz - 23.4375MHz)
• Output frequency range: 145MHz - 187.5MHz and
72.5MHz - 93.75MHz
• VCO range: 580MHz - 750MHz
• RMS phase jitter @156.25MHz (1.875MHz - 20MHz):
0.45ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
BLOCK DIAGRAM
PIN ASSIGNMENT
FREQ_SEL Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
÷32
(fixed)
0 ÷4 (default)
1 ÷8
VDDA
GND
Q XTAL_OUT
nQ XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 FREQ_SEL
ICS844051I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
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.
844051CGI
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 23, 2005
1
1 page  
844051CGI
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 156.25MHZ @ 3.3V
Gb Ethernet Filter
156.25MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.45ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Gb Ethernet Filter to raw data
1k
10k
100k
1M
10M
100M
OFFSET FREQUENCY (HZ)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
TYPICAL PHASE NOISE AT 156.25MHZ @ 2.5V
Gb Ethernet Filter
156.25MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.45ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Gb Ethernet Filter to raw data
1k 10k 100k 1M
OFFSET FREQUENCY (HZ)
www.icst.com/products/hiperclocks.html
10M
5
100M
REV. A NOVEMBER 23, 2005
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
TABLE 8. ORDERING INFORMATION
Part/Order Number
Marking
Package
Shipping Packaging Temperature
ICS844051CGI
451CI
8 Lead TSSOP
tube -40°C to 85°C
ICS844051CGIT
451CI
8 Lead TSSOP
2500 tape & reel
-40°C to 85°C
ICS844051CGILF
TBD
8 Lead "Lead-Free" TSSOP
tube
-40°C to 85°C
ICS844051CGILFT
TBD
8 Lead "Lead-Free" TSSOP 2500 tape & reel
-40°C to 85°C
NOTE: Parts thar are ordered with an "LF" suffix to the part number are the Pb-Free configuraiton and are RoHS compliant.
The aforementioned trademarks, HiPerClockS and FemtoClocks are trademarks of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use
in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not
recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product
for use in life support devices or critical medical instruments.
844051CGI
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 23, 2005
11
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