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PDF ICS843252-04 Data sheet ( Hoja de datos )
| Número de pieza | ICS843252-04 | |
| Descripción | CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR | |
| Fabricantes | ICST | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252-04
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
FEATURES
The ICS843252-04 is a 10Gb/12Gb Ethernet
ICS Clock Generator and a member of the
HiPerClockS™ HiPerClocksTM family of high perfor mance
devices from ICS. The ICS843252-04 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 ICS843252-04 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 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
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
BLOCK DIAGRAM
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
PIN ASSIGNMENT
OE
nPLL_SEL
REF_CLK
Pullup
Pulldown
Pulldown
XTAL_IN
XTAL_OUT
CLK_SEL
OSC
Pulldown
1
0
D
Q
LE
Phase
Detector
1
VCO
580MHz-750MHz
0
DIV. N
÷4
0 = ÷25 (default)
1 = ÷30
nQ1 1
Q1 2
VCCO 3
OE 4
nPLL_SEL 5
VCCO 6
Q0 Q0 7
nQ0 nQ0 8
16 XTAL_IN
15 XTAL_OUT
14 VEE
13 REF_CLK
12 CLK_SEL
11 VCC
10 VCCA
9 FREQ_SEL
Q1
nQ1
ICS843252-04
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.
843252AG-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 25, 2006
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252-04
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
2V
VCC,
VCCA,
V
CCO
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
nQx
Qx
nQy
Qy
t sk(o)
Clock
20%
Outputs
80%
tR
80%
tF
VSW I N G
20%
OUTPUT SKEW
OUTPUT RISE/FALL TIME
nQ0, nQ1
Q0, Q1
t PW
t
PERIOD
odc = t PW x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
843252AG-04
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 25, 2006
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252-04
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
PACKAGE OUTLINE - G SUFFIX FOR 16 LEAD TSSOP
843252AG-04
TABLE 7. 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
9
REV. A JANUARY 25, 2006
11 Page | ||
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| PDF Descargar | [ Datasheet ICS843252-04.PDF ] | |
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