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PDF ICS843251-04 Data sheet ( Hoja de datos )
| Número de pieza | ICS843251-04 | |
| Descripción | CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR | |
| Fabricantes | ICST | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251-04
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS843251-04 is a 10Gb/12Gb Ethernet
ICS Clock Generator and a member of the
HiPerClockS™ HiPerClocksTM family of high perfor mance
devices from ICS. The ICS843251-04 can
synthesize 10 Gigabit Ethernet and 12 Gigabit
Ethernet with a 25MHz crystal. It can also generate SATA
and 10Gb Fibre Channel reference clock frequencies with
the appropriate choice of crystals. The ICS843251-04 has
excellent phase jitter performance and is packaged in a
small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
• 1 differential 3.3V LVPECL output
• Crystal oscillator interface designed for
18pF parallel resonant crystals
• Crystal input frequency range: 19.33MHz - 30MHz
• Output frequency range: 145MHz - 187.5MHz
• VCO frequency range: 580MHz - 750MHz
• RMS phase jitter at 156.25MHz (1.875MHz - 20MHz):
0.39ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Available in both standard and lead-free compliant
packages
CONFIGURATION TABLE WITH 25MHZ CRYSTAL
Inputs
Crystal Frequency Feedback VCO Frequency
(MHz)
Divide
(MHz)
25 30 750
25 25 625
N Output Divide
4
4
Output Frequency
(MHz)
187.5
156.25
Application
12 Gigabit Ethernet
10 Gigabit Ethernet
CONFIGURATION TABLE WITH SELECTABLE CRYSTALS
Inputs
Crystal Frequency Feedback VCO Frequency
(MHz)
Divide
(MHz)
20 30 600
21.25
30 637.5
24 25 600
25.5
25 637.5
30 25 750
N Output Divide
4
4
4
4
4
Output Frequency
(MHz)
Application
150
159.375
150
159.375
187.5
SATA
10 Gigabit Fibre Channel
SATA
10 Gigabit Fibre Channel
12 Gigabit Ethernet
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
XTAL_OUT
OSC
FREQ_SEL Pulldown
Phase
Detector
VCO
580MHz-750MHz
0 = ÷25 (default)
1 = ÷30
DIV. N
÷4
VCCA 1
8 VCC
nQ
VEE 2
7Q
Q
XTAL_OUT 3
6 nQ
XTAL_IN 4
5 FREQ_SEL
ICS843251-04
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.
843251AG-04
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 12, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251-04
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
2V
VCC
LVPECL
VEE
-1.3V ± 0.165V
SCOPE
Qx
nQx
Phase Noise Plot
Phase Noise Mask
f1 Offset Frequency f2
RMS Jitter = Area Under the Masked Phase Noise Plot
3.3V OUTPUT LOAD AC TEST CIRCUIT
RMS PHASE JITTER
nQ0
Q0
t PW
t
PERIOD
odc = t PW x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
Clock
20%
Outputs
80%
tR
80%
tF
VSW I N G
20%
OUTPUT RISE/FALL TIME
843251AG-04
www.icst.com/products/hiperclocks.html
5
REV. A SEPTEMBER 12, 2005
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICS843251-04.PDF ] | |
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