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PDF ICS844252-04 Data sheet ( Hoja de datos )
| Número de pieza | ICS844252-04 | |
| Descripción | CRYSTAL-TO-LVDS CLOCK GENERATOR | |
| Fabricantes | ICS | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
GENERAL DESCRIPTION
FEATURES
The ICS844252-04 is a 10Gb/12Gb Ethernet
ICS Clock Generator and a member of the
HiPerClockS™ HiPerClocksTM family of high perfor mance
devices from ICS. The ICS844252-04 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 ICS844252-04 has
excellent phase jitter performance and is packaged in a
small 16-pin TSSOP, making it ideal for use in systems with
limited board space.
• Two differential LVDS outputs
• 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):
0.36ps (typical)
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
CONFIGURATION TABLE WITH 25MHZ CRYSTAL
• Available in both standard and lead-free compliant
packages
Inputs
Crystal Frequency Feedback VCO Frequency
(MHz)
Divide
(MHz)
N Output Divide
Output Frequency
(MHz)
Application
25 30 750
4
187.5
12 Gigabit Ethernet
25 25 625
4
156.25
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
OE Pullup
nPLL_SEL
Pulldown
REF_CLK
Pulldown
1
XTAL_IN
XTAL_OUT
CLK_SEL
OSC
Pulldown
0
D
Q
LE
Phase
Detector
1
VCO
580MHz-750MHz
0
DIV. N
÷4
0 = ÷25 (default)
1 = ÷30
PIN ASSIGNMENT
nQ1 1
Q1 2
VDDO 3
OE 4
nPLL_SEL 5
VDDO 6
Q0 Q0 7
nQ0 nQ0 8
16 XTAL_IN
15 XTAL_OUT
14 GND
13 REF_CLK
12 CLK_SEL
11 VDD
10 VDDA
9 FREQ_SEL
Q1
nQ1
ICS844252-04
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
FREQ_SEL
Pulldown
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.
844252AG-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 26, 2006
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
TYPICAL PHASE NOISE AT 156.25MHZ
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
Gb Ethernet Filter
156.25MHz
RMS Phase Noise Jitter
1.875MHz to 20MHz = 0.36ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding a
Gb Ethernet Filter Filter to raw data
10k 100k 1M 10M 100M
OFFSET FREQUENCY (HZ)
844252AG-04
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 26, 2006
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
PACKAGE OUTLINE - G SUFFIX FOR 16 LEAD TSSOP
844252AG-04
TABLE 8. PACKAGE DIMENSIONS
SYMBOL
Millimeters
Minimum
Maximum
N 16
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 4.90 5.10
E 6.40 BASIC
E1 4.30 4.50
e 0.65 BASIC
L 0.45 0.75
α 0° 8°
aaa -- 0.10
Reference Document: JEDEC Publication 95, MO-153
www.icst.com/products/hiperclocks.html
11
REV. A JANUARY 26, 2006
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ICS844252-04.PDF ] | |
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