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PDF ICS843251I-12 Data sheet ( Hoja de datos )
| Número de pieza | ICS843251I-12 | |
| Descripción | LVPECL CLOCK GENERATOR | |
| Fabricantes | ICST | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251I-12
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS843251I-12 is a 10Gb Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS843251I-12 uses an 18pF parallel resonant
crystal over the range of 23.2MHz - 30MHz. For
Ethernet applications, a 25MHz crystal is used. The device
has excellent <1ps phase jitter performance, over the
1.875MHz - 20MHz integration range. The ICS843251I-12
is packaged in a small 8-pin TSSOP, making it ideal for
use in systems with limited board space.
FEATURES
• One Differential LVPECL output
• Crystal oscillator interface, 18pF parallel resonant crystal
(23.2MHz - 30MHz)
• Output frequency range: 290MHz - 750MHz
• VCO range: 580MHz - 750MHz
• RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.36ps (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
COMMON CONFIGURATION TABLE
Crystal Frequency
(MHz)
25
Inputs
FREQ_SEL M
0 25
25 1 25
Output Frequency
N
Multiplication Value
M/N
(MHz)
1 25
625
2 12.5
312.5
BLOCK DIAGRAM
FREQ_SEL Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
580MHz - 750MHz
M = ÷25 (fixed)
FREQ_SEL N
0 ÷1
1 ÷2
PIN ASSIGNMENT
VCCA 1
8 VCC
VEE 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS843251I-12
8-Lead TSSOP
4.4mm 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.
843251BGI-12
www.icst.com/products/hiperclocks.html
REV. A JANUARY 10, 2006
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251I-12
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
TYPICAL PHASE NOISE AT 312.5MHZ (3.3V)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
Raw Phase Noise Data
10GigE Filter
312.5MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.36ps (typical)
Phase Noise Result by adding
10GigE Filter to raw data
1k
10k
100k
1M
10M
100M
OFFSET FREQUENCY
843251BGI-12
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 10, 2006
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251I-12
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
PACKAGE OUTLINE - G SUFFIX FOR 8 LEAD TSSOP
843251BGI-12
TABLE 7. PACKAGE DIMENSIONS
SYMBOL
Millimeters
Minimum
Maximum
N8
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 2.90 3.10
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 10, 2006
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ICS843251I-12.PDF ] | |
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