ICST ICS8520DY Datasheet
PRELIMINARY
Integrated
Circuit
Systems, Inc.
DIFFERENTIAL-TO-3.3V LVHSTL FANOUT BUFFER
GENERAL DESCRIPTION
,&6
HiPerClockS™
pair can accept most standard differential input levels.
Guaranteed output skew, part-to-part skew and crossover
voltage characteristics make the ICS8520 ideal for interfacing to today’s most advanced microprocessor and static
RAMs.
The ICS8520 is a low skew, high performance
1-to-16 Differential-to-3.3V L VHSTL Fanout Buf fer
and a member of the HiPerClockS™ family of
High Performance Clock Solutions from ICS. The
ICS8520 has 1 clock input pair . The CLK, nCLK
ICS8520
LOW SKEW, 1-TO-16
FEATURES
• 16 differential 3.3V L VHSTL outputs each with the ability to
drive 50Ω to ground
• 1 differential CLK, nCLK input pair
• CLK, nCLK pair can accept the following differential input
levels: L VDS, L VPECL, L VHSTL, SSTL, HCSL
• Maximum output frequency up to 500MHz
• Translates single ended input levels to L VHSTL levels with
resistor bias nCLK input
• Output skew: 50ps (maximum)
• Part-to-part skew: 250ps (maximum)
• Propagation delay: 1.6ns (maximum)
• VOH: 1.2V (maximum)
• 40% of VOH ≤ Vcrossover ≤ 60% of VOH
• 3.3V core, 1.8V output operating supply voltages
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM PIN ASSIGNMENT
CLK
nCLK
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
nQ7
Q15
nQ15
Q14
nQ14
Q13
nQ13
Q12
nQ12
Q11
nQ11
Q10
nQ10
Q9
nQ9
Q8
nQ8
VCCO
Q11
nQ11
Q10
nQ10
GND
Q9
nQ9
Q8
nQ8
VCCO
VCC
VCCO
nQ12
Q12
48 47 46 45 44 43 42 41 40 39 38 37
1
2
3
4
5
6
7
8
9
10
11
12
13 14 15 16 17 18 19 20 21 22 23 24
nQ7
Q7
VCCO
VCC
48-Lead LQFP
nQ14
nQ13
GND
Q13
ICS8520
GND
nQ6
Q6
Q5
7mm x 7mm x 1.4mm body package
Y Package
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.
ICS8520DY www.icst.com/products/hiperclocks.html REV. B JULY 5, 2001
1
Q14
nQ15
nQ5
Q15
Q4
VCCO
nCLK
VCCO
nQ4
36
35
34
33
32
31
30
29
28
27
26
25
CLK
VCCO
nQ0
Q0
nQ1
Q1
GND
nQ2
Q2
nQ3
Q3
VCCO
PRELIMINARY
Integrated
Circuit
Systems, Inc.
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
,11,1
,42,41
,53,52
84,83
3,211Qn,11QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
5,401Qn,01QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
,91,6
34,03
8,79Qn,9QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
01,98Qn,8QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
31,21CCVrewoP.V3.3ottcennoC.snipylppusevitisoP
61,517Qn,7QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
81,716Qn,6QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
12,025Qn,5QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
32,224Qn,4QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
72,623Qn,3QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
92,822Qn,2QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
63KLCtupnInwodlluP.tupnikcolclaitnereffidgnitrevninoN
73KLCntupnIpulluP.tupnikcolclaitnereffidgnitrevnI
04,9351Qn,51QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
24,1441Qn,41QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
54,4431Qn,31QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
74,6421Qn,21QtuptuO.slevelecafretniLTSHVL.riaptuptuolaitnereffiD
:ETON
pulluP
OCCVrewoP.V8.1ottcennoC.snipylppustuptuO
EEVrewoP.dnuorgottcennoC.snipylppusevitageN
dna
nwodlluP
ICS8520
LOW SKEW, 1-TO-16
DIFFERENTIAL-TO-3.3V LVHSTL FANOUT BUFFER
.seulavlacipytrof,scitsiretcarahCniP,2elbaTeeS.srotsisertupnilanretniotsrefer
ICS8520DY www.icst.com/products/hiperclocks.html REV. B JULY 5, 2001
2
PRELIMINARY
Integrated
Circuit
Systems, Inc.
LOW SKEW, 1-TO-16
ICS8520
DIFFERENTIAL-TO-3.3V LVHSTL FANOUT BUFFER
TABLE 2. PIN CHARACTERISTICS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
NICecnaticapaCtupnIKLCn,KLC4Fp
PULLUPRrotsiseRpulluPtupnI 15KΩ
NWODLLUPRrotsiseRnwodlluPtupnI 15KΩ
TABLE 3. FUNCTION TABLE
stupnIstuptuO
KLCKLCn51Qurht0Q51Qnurht0Qn
01 WOLHGIHlaitnereffiDotlaitnereffiDgnitrevnInoN
10 HGIHWOLlaitnereffiDotlaitnereffiDgnitrevnInoN
01ETON;desaiBWOLHGIHlaitnereffiDotdednEelgniSgnitrevnInoN
11ETON;desaiBHGIHWOLlaitnereffiDotdednEelgniSgnitrevnInoN
1ETON;desaiB0HGIHWOLlaitnereffiDotdednEelgniSgnitrevnI
1ETON;desaiB1WOLHGIHlaitnereffiDotdednEelgniSgnitrevnI
1.0adnadnuorgoteulavlauqeforotsisera,CCVot µ sitniophctiwsgnitluserehT.dnuorgottupniehtmorfroticapacF
.Vm003±2/CCVyletamixorppa
edoMtuptuOottupnIytiraloP
ehtstestupnidesaibehttaegatlovehT.desaibebstupnilaitnereffidehtfoenotahtseriuqeresudedneelgniS:1ETON
rotsiserasikrowtensaibtupnidednemmocerehtslevelLTTVLdnaSOMCVLroF.tupnidedneelgnisehtroftniophctiws
ICS8520DY www.icst.com/products/hiperclocks.html REV. B JULY 5, 2001
3
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