
FEMTOCLOCKS CRYSTAL-TO-2.5V LVPECL
FREQUENCY SYNTHESIZER
ICS843001-40
IDT / ICS 2.5V LVPECL FREQUENCY SYNTHESIZER
1
ICS843001AK-40 REV. A OCTOBER 10, 2007
GENERAL DESCRIPTION
The ICS843001-40 is an LVPECL output Synthesizer
and is a member of the HiPerClocksTM family of high
performance devices from IDT. The device uses a
40MHz crystal to provide a 40MHz reference clock
output and to synthesize a 50MHz, 100MHz, or
106.25MHz output. The ICS843001-40 has excellent <1ps phase
jitter performance over the 637kHz – 5MHz integration range.
The ICS843001-40 is packaged in a 3mm x 3mm 16-pin VFQFN,
making it ideal for use on space constrained boards.
FEATURES
One differential 2.5V LVPECL output
One reference clock output, 30
Ω typical output impedance
40MHz, 10pF parallel resonant crystal
Output frequencies: 50MHz, 100MHz, or 106.25MHz
RMS phase jitter @ 106.25MHz, using a 40MHz crystal
(637kHz –5MHz): 0.35ps (typical)
2.5V operating supply
0°C to 70°C ambient operating temperature
Availabe in lead-free (RoHS 6) package
HiPerClockS
ICS
BLOCK DIAGRAM
PIN ASSIGNMENT
OSC
Synthesizer
2
Q
nQ
REF_OUT
XTAL_IN
XTAL_OUT
SEL[1:0] Pulldown
ICS843001-40
16-Lead VFQFN
3mm x 3mm x 0.925 package body
K Package
Top View
SEL1
XTAL_OUT
XTAL_IN
SEL0
nQ
VCCO_LVPECL
VCC
REF_OUT
V
EE
nc
V
CCO
_
REF
_
OUT
V
EE
V
CCA
nc
Q
1
2
3
4
12
11
10
9
5
6
7
8
16 15 14 13
FUNCTION TABLE
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0
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00
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6
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10
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