840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
1
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS840011 is a Fibre Channel Clock
Generator and a member of the HiPerClocksTM
family of high performance devices from ICS.
The ICS840011 uses a 26.5625MHz or 25MHz
crystal to synthesize 106.25MHz or 100MHz
respectively. The ICS840011 has excellent phase jitter
performance, from 637KHz – 10MHz integration range. The
ICS840011 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
FEATURES
•1 LVCMOS/LVTTL output, 7Ω output impedence
•Crystal oscillator interface designed for a 26.5625MHz or
25MHz, 18pF parallel resonant crystal
•Output frequency: 106.25MHz (typical)
•VCO range: 560MHz to 680MHz
•RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637KHz - 10MHz): 0.780ps (typical)
•RMS phase noise at 106.25MHz (typical)
Phase noise:
Offset Noise Power
100Hz ............... -95.7 dBc/Hz
1KHz ................ -121 dBc/Hz
10KHz ................ -129 dBc/Hz
100KHz .............. -129.6 dBc/Hz
•3.3V operating supply
•-30°C to 85°C ambient operating temperature
HiPerClockS™
ICS
ICS840011
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
VDDA
OE
XTAL_OUT
XTAL_IN
1
2
3
4
VDD
Q0
GND
nc
8
7
6
5
BLOCK DIAGRAM PIN ASSIGNMENT
OSC Phase
Detector
VCO
637.5MHz w/
26.5625MHz Ref.
M = ÷24 (fixed)
÷6
XTAL_IN
XTAL_OUT
OE
Q0
FREQUENCY TABLE
stupnI ycneuqerFtuptuO
)zHM(
)zHM(ycneuqerFlatsyrC
5265.6252.601
52001
(Pullup)
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
2
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 2. PIN CHARACTERISTICS
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
1V
ADD
rewoP.nipylppusgolanA
2EOtupnIpulluP .delbanesituptuo0Q,HGIHnehW.nipelbanetuptuO
.slevelecafretniLTTVL/SOMCV
L.etatsZiHot0Qsecrof,WOLnehW
,3
4
,TUO_LATX
NI_LATX tupnI ,tupniehtsiNI_LATX.ecafretnirotallicsolatsyrC
.tup
tuoehtsiTUO_LATX
5cndesunU.tcennocoN
6DNGrewoP.dnuorgylppusrewoP
70QtuptuO .slevelecafretniLTTVL/SOMCVL.tuptuokco
lcdedne-elgniS
7Ω.ecnadepmituptuo
8V
DD
rewoP.nipylppuseroC
:ETON
pulluP
.seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotsrefer
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
C
NI
ecnaticapaCtupnI 4Fp
C
DP
ecnaticapaCnoitapissiDrewoPV
DD
V,
ADD
V564.3=42Fp
R
PULLUP
rotsiseRpulluPtupnI 15KΩ
R
TUO
ecnadepmItuptuO 57 21Ω
TABLE 3. CONTROL FUNCTION TABLE
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EO0Q
0Z-iH
1evitcA
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
3
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, TA = -30°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
DD
egatloVylppuSeroC 531.33.3564.3V
V
ADD
egatloVylppuSgolanA 531.33.3564.3V
I
DD
tnerruCylppuSrewoP 08Am
I
ADD
tnerruCylppuSgolanA 01Am
TABLE 5. CRYSTAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
DD 4.6V
Inputs, VI-0.5V to VDD + 0.5 V
Outputs, VO-0.5V to VDD + 0.5V
Package Thermal Impedance, θJA 101.7°C/W (0 mps)
Storage Temperature, T
STG -65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics
or
AC Character-
istics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, TA = -30°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
V
HI
egatloVhgiHtupnI 2V
DD
3.0+V
V
LI
egatloVwoLtupnI 3.0-8.0V
I
HI
tnerruChgiHtupnIEOV
DD
V=
NI
V564.3=5Aµ
I
LI
tnerruCwoLtupnIEOV
DD
V,V564.3=
NI
V0=051-Aµ
V
HO
1ETON;egatloVhgiHtuptuO 6.2V
V
LO
1ETON;egatloVwoLtuptuO 5.0V
05htiwdetanimretstuptuO:1ETON ΩVot
DD
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."tiucriCtseTdaoLtuptuOV3.3"
retemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
noitallicsOfoedoM latnemadnuF
ycneuqerF 5265.62zHM
)RSE(ecnats
iseRseireStnelaviuqE 05 Ω
ecnaticapaCtnuhS 7Fp
TABLE 6. AC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, TA = -30°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
f
TUO
ycneuqerFtuptuO 33.3952.60133.311zHM
t
)Ø(tij ;)modnaR(rettiJesahPSMR
1ETON
,zHM52.601=TUOf
)zHM01otzHK736( 087.0sp
t
R
t/
F
emiTllaF/esiRtuptuO%08ot%02052006sp
cdoelcyCytuDtuptuOzHM52.601=TUOf8425%
.zHM52.601@deziretcarahcerasretemarapl
lA
.tolPesioNesahPehtotreferesaelP:1ETON
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
4
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TYPICAL PHASE NOISE AT 106.25MHZ
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100 1k 10k 100k 1M 10M 100M
106.25MHz
RMS Phase Jitter (Random)
637K to 10MHz = 0.780ps (typical)
OFFSET FREQUENCY (HZ)
NOISE POWER dBc
Hz
Phase Noise Result by adding
Fibre Channel Filter to raw data
Raw Phase Noise Data
Fibre Channel Filter
➤
➤
➤
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
5
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
PARAMETER MEASUREMENT INFORMATION
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD OUTPUT RISE/FALL TIME
3.3V OUTPUT LOAD AC TEST CIRCUIT
SCOPE
Qx
LVCMOS
1.65V ± 5%
-1.65V ± 5%
Clock
Outputs
20%
80% 80%
20%
t
R
t
F
Pulse Width
tPERIOD
tPW
tPERIOD
odc =
V
DD
2
Q0
GND
VDD
RMS PHASE JITTER
Phase Noise Mas
k
Offset Frequency
f1f2
Phase Noise Plot
RMS Jitter = Area Under the Masked Phase Noise Plot
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
6
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
APPLICATION INFORMATION
Figure 2. CRYSTAL INPUt INTERFACE
CRYSTAL INPUT INTERFACE
The ICS840011 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 2
below were determined using a 26.5625MHz, 18pF
parallel resonant crystal and were chosen to minimize the
ppm error. The optimum C1 and C2 values can be slightly
adjusted for different board layouts.
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. The ICS840011 provides separate
power supplies to isolate any high switching noise from the out-
puts to the internal PLL. VDD, and VDDA should be individually con-
nected to the power supply plane through vias, and bypass ca-
pacitors should be used for each pin. To achieve optimum
jitter performance, power supply isolation is required.
Figure 1
illustrates how a 10Ω resistor along with a 10µF and a .01µF
bypass capacitor should be connected to each VDDA pin.
POWER SUPPLY FILTERING T ECHNIQUES
FIGURE 1. POWER SUPPLY FILTERING
10Ω
VDDA
10µF
.01µF
3.3V
.01µF
VDD
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
7
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
APPLICATION SCHEMATIC
Figure 3A
shows a schematic example of the ICS840011. An
example of LVCMOS termination is shown in this schematic.
Additional LVCMOS termination approaches are shown in the
LVCMOS Termination Application Note. In this example, an 18pF
parallel resonant 26.5625MHz crystal is used for generating
106.25MHz output frequency. The C1 = 27pF and C2 = 33pF
are recommended for frequency accuracy. For different board
layout, the C1 and C2 values may be slightly adjusted for opti-
mizing frequency accuracy.
FIGURE 3A. ICS840011 SCHEMATIC EXAMPLE
PC BOARD LAYOUT EXAMPLE
Figure 3B
shows an example of P.C. board layout. The crystal
X1 footprint in this example allows either surface mount (HC49S)
or through hole (HC49) package. C3 is 0805. C1 and C2 are
0402. Other resistors and capacitors are 0603. This layout as-
sumes that the board has clean analog power and ground planes.
FIGURE 3B. ICS840011 PC BOARD LAYOUT EXAMPLE
R3
43 Zo = 50 Ohm
R2
10
OE
C5
0.1u
VDD
U1
ICS840011
1
2
3
4
8
7
6
5
VDDA
OE
XTA L _ O U T
XTA L _ I N
VDD
Q0
GND
NC
C4
0.1u
C3
10uF
C1
27pF
C2
33pF
VDD=3.3V
X1
VDDA
VDD
Q
LVCMOS
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
8
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
RELIABILITY INFORMATION
TRANSISTOR COUNT
The transistor count for ICS840011 is: 1521
TABLE 7. θJAVS. AIR FLOW TABLE FOR 8 LEAD TSSOP
θθ
θθ
θJA by Velocity (Meters Per Second)
0 1 2.5
Multi-Layer PCB, JEDEC Standard Test Boards 101.7°C/W 90.5°C/W 89.8°C/W
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
9
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
PACKAGE OUTLINE - G SUFFIX FOR 8 LEAD TSSOP
TABLE 8. PACKAGE DIMENSIONS
Reference Document: JEDEC Publication 95, MO-153
LOBMYS sretemilliM
muminiMmumixaM
N8
A--02.1
1A50.051.0
2A08.050.1
b91.003.0
c90.002.0
D09.201.3
ECISAB04.6
1E03.405.4
eCISAB56.0
L54
.057.0
α°0°8
aaa--01.0
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
10
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 9. ORDERING INFORMATION
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use
in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not
recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product
for use in life support devices or critical medical instruments.
rebmuNredrO/traPgnikraMegakcaPtnuoCerutarepmeT
GA110048SCIA110POSSTdael8ebutrep001C°58otC°03-
TGA110048SCIA110lee
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NLGA110048SCINA110POSST"delaennAeerFdaeL"dael8ebutrep001C°58otC°03-
TNLGA
110048SCINA110 POSST"delaennAeerFdaeL"dael8
leeRdnaepaTno 0052C°58otC°03-
The aforementioned trademarks, HiPerClockS™ and FemtoClocks™ are a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
840011AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 15, 2004
11
Integrated
Circuit
Systems, Inc.
ICS840011
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TEEHSYROTSIHNOISIVER
veRelbaTegaPegnahCfonoitpircseDetaD
A9T01 .001otebutrep451morftnuocdetcerroc-elbaTnoitamr
ofnIgniredrO 40/51/01
