ICST ICS8431CM-01, ICS8431CM-01T Datasheet
Integrated
Circuit
Systems, Inc.
ICS8431-01
200MHZ, LOW JITTER,
L VPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
,&6
HiPerClockS™
bandwidth PLL timing channel. A 16.666MHz crystal is used
as the input to the on-chip oscillator. The M is configured to
produce a fixed output frequency of 200MHz.
Programmable features of the ICS8431-01 support four
operational modes. The four modes are spread spectrum
clocking (SSC), non-spread spectrum clock and two test
modes which are controlled by the SSC_CTL[1:0] pins. Unlike other synthesizers, the ICS8431-01 can immediately
change spread-spectrum operation without having to reset
the device.
In SSC mode, the output clock is modulated in order to
achieve a reduction in EMI. In one of the PLL bypass test
modes, the PLL is disconnected as the source to the
differential output allowing an external source to be
connnected to the TEST_I/O pin. This is useful for incircuit testing and allows the differential output to be driven
at a lower frequency throughout the system clock tree. In the
other PLL bypass mode, the oscillator divider is used as the
source to both the M and the Fout divide by 2. This is useful
for characterizing the oscillator and internal dividers.
The ICS8431-01 is a general purpose clock
frequency synthesizer for IA64/32 application and
a member of the HiPerClockS™ family of High
Performance Clock Solutions from ICS. The
ICS8431-01 consists of one independent low
FEATURES
• Fully integrated PLL
• Differential 3.3V L VPECL output
• 200MHz output frequency
• 48% to 52% duty cycle
• Crystal oscillator interface
• Spread Spectrum Clocking (SSC) fixed at 1/2% modulation
for environments requiring ultra low EMI. T ypical10dB EMI
reduction can be achieved with spread spectrum modulation
• LVTTL / L VCMOS control inputs
• PLL bypass modes supporting in-circuit testing and on-chip
functional block characterization
• 28 lead SOIC
• RMS cycle-to-cycle jitter of 2ps
• Typical cycle-to-cycle jitter of 18ps
• 0° to 85°C ambiant operating temperature
BLOCK DIAGRAM PIN ASSIGNMENT
nc
XTAL1
XTAL2
SSC_CTL0
SSC_CTL1
ICS8431CM-01 www.icst.com/products/hiperclocks.html REV. A JUNE 5, 2001
OSC
÷ 16
PHASE
DETECTOR
÷ M
SSC
Control
Logic
PLL
VCO
÷ 2
FOUT
nFOUT
TEST_I/O
1
SSC_CTL0
SSC_CTL1
TEST_I/O
1
nc
2
nc
3
nc
4
nc
5
nc
6
nc
7
nc
8
nc
9
10
11
VEE
12
13
VDD
14
ICS8431-01
28-Lead SOIC
M Package
Top View
28
27
26
25
24
23
22
21
20
19
18
17
16
15
nc
VDDI
XTAL2
XTAL1
nc
nc
VDDA
VEE
RESERVED
nc
VDDO
FOUT
nFOUT
VEE
Integrated
Circuit
Systems, Inc.
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
,91,9-1
82,42,32
11,01
21DNGrewoP.tuptuotsetdnaerocrofnipdnuorG
31O/I_TSET
72,41DDVrewoP.tuptuotsetdnaerocrofnipylppusrewoP
51DNGrewoP.tuptuorofnipdnuorG
71,61TUOF,TUOFntuptuO
81ODDVrewoP.tuptuorofnipylppusrewoP
02DEVRESERevreseR.nipevreseR
12EEVrewoP.nipdnuorG
22ADDVrewoP.nipylppusrewopLLP
62,522LATX,1LATXtupnI.tupnirotallicsolatsyrC
72IDDVrewoP.V3.3ottcennoC.nipylppusrewoperocdnatupnI
cndesunU.snipdesunU
,0LTC_CSS
1LTC_CSS
tupnIpulluP.slevelecafretniSOMCVL/LTTVL.sniplortnocCSS
/tupnI
tuptuO
ICS8431-01
200MHZ, LOW JITTER,
L VPECL FREQUENCY SYNTHESIZER
..elbaTnoitcnuF3elbaTnidenifedsademmargorP
.rezisehtnysehtrofsrevirdtuptuoniamerastuptuolaitnereffidesehT
LCEPVLdecnereferevitisopdetanimrethtiwelbitapmocerayehT
.cigol
TABLE 2. PIN CHARACTERISTICS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
NICecnaticapaCniPtupnI 4Fp
PULLUPRrotsiseRpulluPtupnI 15KΩ
NWODLLUPRrotsiseRnwodlluPtupnI 15KΩ
TABLE 3. SSC CONTROL INPUTS FUNCTION TABLE
stupnI
1LTC_CSS0LTC_CSS
00 lanretnIdelbasiDLATXf ÷ 23
01LLPdelbanEzHM002Z-iHtnecreP½=rotcaFnoitaludoM;CSStluafeD
10 lanretxEdelbasiDklCtseTtupnI
11LLPdelbasiDzHM002Z-iHnoitaludoMCSSoN
O/I_TSET
ecruoS
CSS
,TUOF
TUOFn
.noitaziretcarahcdnagubedesuohnirofdesU:1ETON
stuptuO
LATXf ÷ 61
÷ M
sedoMlanoitarepO
O/I_TSET
1ETON.edomtsetsredivid
1ETON;edoMcitsongaiD
zHM1( ≤ klCtseT ≤ )zHM002
NdnaM,rotallicso,rotallicsO;ssapybLLP
ICS8431CM-01 www.icst.com/products/hiperclocks.html REV. A JUNE 5, 2001
2
Integrated
Circuit
Systems, Inc.
ICS8431-01
200MHZ, LOW JITTER,
L VPECL FREQUENCY SYNTHESIZER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage 4.6V
Inputs -0.5V to VDD + 0.5V
Outputs -0.5V to VDDO + 0.5V
Ambient Operating T emperature 0°C to 85°C
Storage T emperature -65°C to 150°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings
are stress specifications only and functional operation of product at these condition or any conditions beyond those listed in
DC Characteristics
the
periods may affect product reliability.
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = VDDI = VDDO = 3.3V±5%, TA = 0°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
DDVegatloVylppuSrewoP 531.33.3564.3V
ODDVegatloVylppuSrewoPtuptuO 531.33.3564.3V
ADDVegatloVylppuSrewoPgolanA 531.33.3564.3V
IDDVegatloVylppuSrewoPtupnI 531.33.3564.3V
EEI 041Am
or
AC Characteristics
is not implied. Exposure to absolute maximum rating conditions for extended
TABLE 4B. L VCMOS / LVTTL DC CHARACTERISTICS, VDD = VDDA = VDDI = VDDO = 3.3V±5%, TA = 0°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
,0LTC_CSS
HIVegatloVhgiHtupnI
LIVegatloVwoLtupnI
HIItnerruChgiHtupnI
LIItnerruCwoLtupnI
,1LTC_CSS
O/I_TSET
,0LTC_CSS
,1LTC_CSS
O/I_TSET
,0LTC_CSS
,1LTC_CSS
OI_TSET
,0LTC_CSS
,1LTC_CSS
OI_TSET
V531.3 ≤ DDV ≤ V564.32 3.0+DDVV
V531.3 ≤ DDV ≤ V564.33.0-8.0V
V564.3=NIV=DDV5Aµ
V0=NIV,V564.3=DDV051-Aµ
TABLE 4C. L VPECL DC CHARACTERISTICS, VDD = VDDA = VDDI = VDDO = 3.3V±5%, TA = 0°C TO 85°C
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
HOV1ETON;egatloVhgiHtuptuO 82.1-ODDV089.0-ODDVV
LOVegatloVwoLtuptuO1ETON;0.2-ODDV7.1-ODDVV
GNIWSVgniwSegatloVtuptuOkaeP-ot-kaeP006007058Vm
05htiwdetanimrettuptuO:1ETON Ω .V2-ODDVot
ICS8431CM-01 www.icst.com/products/hiperclocks.html REV. A JUNE 5, 2001
3
Integrated
Circuit
Systems, Inc.
ICS8431-01
200MHZ, LOW JITTER,
L VPECL FREQUENCY SYNTHESIZER
TABLE 5. CRYST AL CHARACTERISTICS
retemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
noitallicsOfoedoM latnemadnuF
ycneuqerF 666.61zHM
ecnareloTycneuqerF 05-05+mpp
ytilibatSycneuqerF 001-001+mpp
leveLevirD 001Wµ
)RSE(ecnatsiseRseireStnelaviuqE 05
ecnaiticapaCtnuhS 37Fp
ecnaiticapaCdaoL 018123Fp
ecnatcudnIniPseireS 37Hn
egnaRerutarepmeTgnitarepO 007C°
gnigAC°52@raeyreP5-5+mpp
TABLE 6. AC CHARACTERISTICS, VDD = VDDA = VDDI = VDDO = 3.3V±5%, TA = 0°C TO 85°C, 16.666MHZ CRYST AL
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
DOIREPt2ETON;doirePtuptuOegarevAzHM002=TUOF59945005sp
t
j)cc(ti
cdo;elcyCytuDtuptuO2ETONzHM002=TUOF8425%
Rt2,1ETON;emiTesiRtuptuO%08ot%02003054006sp
Ft2,1ETON;emiTllaFtuptuO%08ot%02003054006sp
latxFegnaRtupnIlatsyrC41666.6181zHM
mF
fmF
derCSS;noitcudeRlartcepS2,1ETON701Bd
ELBATSttuptuOkcolCelbatSotpu-rewoP 01sm
t
j.snoitinifed56DSEJCEDEJotmrofnoccdo,Ft,Rt,)cc(ti
2,1ETON
2,1ETON
2ETON;rettiJelcyC-ot-elcyCzHM002=TUOF8103sp
;ycneuqerFnoitaludoMCSS
;rotcaFnoitaludoMCSS
.delbanegnikcolcmurtcepSdaerpS:1ETON
05htiwdetanimretstuptuO:2ETON Ω .V2-ODDVot
0333.33zHK
4.06.0%
Ω
ICS8431CM-01 www.icst.com/products/hiperclocks.html REV. A JUNE 5, 2001
4
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