ICS843256AMLF Ver la hoja de datos (PDF) - Integrated Circuit Systems
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ICS843256AMLF
Integrated Circuit Systems
ICS843256AMLF Datasheet PDF : 13 Pages
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843256
FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
GENERAL DESCRIPTION
The ICS843256 is a Crystal-to-3.3V LVPECL
ICS
Clock Synthesizer/Fanout Buffer designed for
HiPerClockS™ Fibre Channel and Gigabit Ethernet applications
and is a member of the HiperClockS™ family of
High Performance Clock Solutions from ICS. The
output frequency can be set using the frequency select
pins and a 25MHz crystal for Ethernet frequencies, or a
19.44MHz crystal for SONET. The low phase noise charac-
teristics of the ICS843256 make it an ideal clock for these
demanding applications.
FEATURES
• Six LVPECL outputs
• Crystal oscillator interface
• Output frequency range: 53.125MHz to 333.3333MHz
• Crystal input frequency range: 25MHz to 33.333MHz
• RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz to 20MHz): 0.33ps (typical)
• Full 3.3V or 3.3V core, 2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
SELECT FUNCTION TABLE
Inputs
FB_SEL N_SEL1 N_SEL0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
M Divide
25
25
25
25
32
32
32
32
Function
N Divide
1
2
4
5
1
2
4
8
• Available in both standard and lead-free RoHS-compliant
packages
M/N
25
12.5
6.25
5
32
16
8
4
BLOCK DIAGRAM
PLL_BYPASS Pullup
XTAL_IN
XTAL_OUT
OSC
FB_SEL Pulldown
N_SEL1 Pullup
Pullup
N_SEL0
1
Output
PLL
Divider
0
Feedback
Divider
PIN ASSIGNMENT
Q0
nQ0
Q1
nQ1
Q2
nQ2
VCCO 1
VCCO 2
nQ2 3
Q2 4
nQ1 5
Q1 6
nQ0 7
Q0 8
PLL_BYPASS 9
VCCA 10
VCC 11
FB_SEL 12
24 Q3
23 nQ3
22 Q4
21 nQ4
20 Q5
19 nQ5
18 N_SEL1
17 VEE
16 VEE
15 N_SEL0
14 XTAL_OUT
13 XTAL_IN
Q3
ICS843256
24-Lead, 300-MIL SOIC
nQ3
7.5mm x 15.33mm x 2.3mm
body package
Q4
M Package
Top View
nQ4
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
Q5
body package
G Package
nQ5
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.
843256AM
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 29, 2005
1
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