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PDF ICS8430252-45 Data sheet ( Hoja de datos )
| Número de pieza | ICS8430252-45 | |
| Descripción | FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ICS8430252-45 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8430252-45www.DataSheet4U.com
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS8430252-45 is a 2 output LVPECL and
ICS LVCMOS/LVTTL Synthesizer optimized to gen-
HiPerClockS™ erate Ethernet reference clock frequencies and
is a member of the HiPerClocks™ family of high
performance clock solutions from ICS. Using a
25MHz, 18pF parallel resonant crystal, the following fre-
quencies can be generated: 156.25MHz LVPECL output
and, 125MHz LVCMOS output. The 8430252-45 uses ICS’
3rd generation low phase noise VCO technology and can
achieve 1ps or lower typical rms phase jitter, easily meet-
ing Ethernet jitter requirements. The ICS8430252-45 is
packaged in a small 16-pin TSSOP package.
FEATURES
• One differential 3.3V LVPECL output and
One LVCMOS/LVTTL output
• Crystal oscillator interface designed for a 25MHz,
18pF parallel resonant crystal
• A 25MHz crystal generates both an output frequency of
156.25MHz (LVPECL) and 125MHz (LVCMOS)
• VCO frequency: 625MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz) using
a 25MHz crystal: 0.39ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature available upon request
• Available in both standard and lead-free RoHS compliant
packages
BLOCK DIAGRAM
OE Pullup
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
625MHz
Pullup
CLK_EN
Feedback Divider
÷25
÷5 QA
QB
÷4 nQB
PIN ASSIGNMENT
OE
VEE
QA
VCCO_A
nc
nc
VCCA
VCC
1
2
3
4
5
6
7
8
16 CLK_EN
15 VEE
14 QB
13 nQB
1 2 VCCO_B
11 XTAL_IN
10 XTAL_OUT
9 VEE
ICS8430252-45
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
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.
8430252CG-45
www.icst.com/products/hiperclocks.html
REV. B DECEMBER 9, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8430252-45www.DataSheet4U.com
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
TYPICAL PHASE NOISE AT 156.25MHZ
10Gb Ethernet Filter
156.25MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.39ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
10Gb Ethernet Filterto raw data
10k
100k
1M
10M
100M
OFFSET FREQUENCY (HZ)
8430252CG-45
www.icst.com/products/hiperclocks.html
5
REV. B DECEMBER 9, 2005
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8430252-45www.DataSheet4U.com
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
RELIABILITY INFORMATION
TABLE 8. θJAVS. AIR FLOW TABLE FOR 16 LEAD TSSOP
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
137.1°C/W
89.0°C/W
200
118.2°C/W
81.8°C/W
500
106.8°C/W
78.1°C/W
NOTE: Most modern PCB designs use multi-layered boards.The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS8430252-45 is: 2070
8430252CG-45
www.icst.com/products/hiperclocks.html
11
REV. B DECEMBER 9, 2005
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ICS8430252-45.PDF ] | |
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