ICST ICS8543BG, ICS8543BGT Datasheet
PRELIMINARY
Integrated
Circuit
Systems, Inc.
GENERAL DESCRIPTION
,&6
HiPerClockS™
provides a low power, low noise, solution for distributing clock
signals over controlled impedances of 100Ω. The ICS8543
accepts any differential input level and translates it to 3.3V
L VDS output levels.
Guaranteed output and part-to-part skew characteristics
make the ICS8543 ideal for those applications demanding
well defined performance and repeatability .
The ICS8543 is a low skew, high performance
1-to-4 clock fanout buffer and a member of
the HiPerClockS™ family of High Performance
Clock Solutions from ICS. Utilizing Low Voltage
Differential Signaling (LVDS) the ICS8543
ICS8543
LOW SKEW, 1-TO-4
LVDS FANOUT BUFFER
FEATURES
• 4 L VDS outputs
• Designed to meet or exceed the requirements of ANSI
TIA/EIA-644
• Selectable differential HSTL or L VPECL clock inputs
• L VCMOS / L VTTL control inputs
• 3.3V operating supply
• 20 lead TSSOP
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM PIN ASSIGNMENT
CLK_EN
HCLK
nHCLK
PCLK
nPCLK
CLK_SEL
OE
nD
Q
LE
0
1
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
VEE
CLK_EN
CLK_SEL
HCLK
nHCLK
PCLK
nPCLK
OE
VEE
VDD
20-Lead TSSOP
20
1
19
2
18
3
17
4
16
5
15
6
14
7
13
8
12
9
11
10
ICS8543
G Package
Top View
Q0
nQ0
VDD
Q1
nQ1
Q2
nQ2
VEE
Q3
nQ3
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.
ICS8543BG www.icst.com/products/hiperclocks.html REV. C MAY 21, 2001
1
PRELIMINAR Y
Integrated
Circuit
Systems, Inc.
TABLE 1. PIN DESCRIPTIONS
rebmuNemaNepyTnoitpircseD
31,9,1EEVrewoP.dnuorgottcennoC.dnuorgylppusrewoP
2NE_KLCtupnIpulluP
3LES_KLCtupnInwodlluP
4KLCHtupnInwodlluP.tupnikcolcLTSHlaitnereffidgnitrevni-noN
5KLCHntupnIpulluP.tupnikcolcLTSHlaitnereffidgnitrevnI
6KLCPtupnInwodlluP.tupnikcolcLCEPlaitnereffidgnitrevni-noN
7KLCPntupnIpulluP.tupnikcolcLCEPlaitnereffidgnitrevnI
8EOtupnIpulluP
81,01DDVrewoP.V3.3ottcennoC.nipylppusrewoP
21,113Q,3QntuptuO.slevelecafretniSDVL.stuptuokcolclaitnereffiD
51,412Q,2QntuptuO.slevelecafretniSDVL.stuptuokcolclaitnereffiD
71,611Q,1QntuptuO.slevelecafretniSDVL.stuptuokcolclaitnereffiD
02,910Q,0QntuptuO.slevelecafretniSDVL.stuptuokcolclaitnereffiD
ICS8543
LOW SKEW, 1-TO-4
L VDS FANOUT BUFFER
kcolcswollofstuptuokcolcHGIHnehW.elbanekcolcsuonorhcnyS
.hgihecroferastuptuoQn,wolecroferastuptuoQ,WOLnehW.tupni
.slevelecafretniLTTVL/SOMCVL
.stupniLCEPlaitnereffidstcelesHGIHnehW.tupnitceleskcolC
.stupniLTSHlaitnereffidstcelesWOLnehW
.slevelecafretniLTTVL/SOMCVL
0Qn,0QstuptuofognilbasiddnagnilbaneslortnoC.elbanetuptuO
3Qn,3Qurht
TABLE 2. PIN CHARACTERISTICS
lobmySretemaraPsnoitidnoCtseTmuminiMlacipyTmumixaMstinU
NICecnaticapaCtupnI
PULLUPRrotsiseRpulluPtupnI 15KΩ
NWODLLUPRrotsiseRnwodlluPtupnI 15KΩ
KLCHn,KLCH4Fp
KCLPn,KLCP4Fp
,NE_KLC
LES_KLC
4Fp
ICS8543BG www.icst.com/products/hiperclocks.html REV. C MAY 21, 2001
2
PRELIMINARY
Integrated
Circuit
Systems, Inc.
TABLE 3A. CONTROL INPUTS FUNCTION TABLE
stupnIstuptuO
EONE_KLCLES_KLC3Qurht1Q3Qnurht1Qn
0XX ZiHZiH
100 woLhgiH
10 1 woLhgiH
110 EVITCAEVITCA
111 EVITCAEVITCA
.B3elbaT
TABLE 3B. CLOCK INPUTS FUNCTION TABLE
stupnIstuptuO
KLCP,KLCHKLCPn,KLCHn3Qurht0Q3Qnurht0Qn
01 WOLHGIHlaitnereffiDotlaitnereffiDgnitrevnInoN
10 HGIHWOLlaitnereffiDotlaitnereffiDgnitrevnInoN
01ETON;desaiBWOLHGIHlaitnereffiDotdednEelgniSgnitrevnInoN
11ETON;desaiBHGIHWOLlaitnereffiDotdednEelgniSgnitrevnInoN
1ETON;desaiB0HGIHWOLlaitnereffiDotdednEelgniSgnitrevnI
1ETON;desaiB1WOLHGIHlaitnereffiDotdednEelgniSgnitrevnI
.Vm003±2/CCVyletamixorppa
ICS8543
LOW SKEW, 1-TO-4
LVDS FANOUT BUFFER
nidebircsedsastupniKLCPn,KLCPdnaKLCHn,KLCHehtfonoitcnufasituptuoehtfoetatsehtedomevitcaehtnI
edoMtuptuOottupnIytiraloP
ehtstestupnidesaibehttaegatlovehT.desaibebstupnilaitnereffidehtfoenotahtseriuqeresudedneelgniS:1ETON
otrotsiserasikrowtensaibtupnidednemmocerehtslevelLTTVLdnaSOMCVLroF.tupnidedneelgnisehtroftniophctiws
1.0adnadnuorgoteulavlauqeforotsisera,CCV µ sitniophctiwsgnitluserehT.dnuorgottupniehtmorfroticapacF
ICS8543BG www.icst.com/products/hiperclocks.html REV. C MAY 21, 2001
3
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