IS61WV25616EDBLL
IS64WV25616EDBLL
256K x 16 HIGH SPEED ASYNCHRONOUS
CMOS STATIC RAM WITH ECC
OCTOBER 2011
DESCRIPTION
FEATURES
Theꢀ ISSIꢀ IS61/64WV25616EDBLLꢀ isꢀ aꢀ ꢀ high-speed,ꢀ
4,194,304-bitꢀstaticꢀRAMsꢀorganizedꢀasꢀ262,144ꢀwordsꢀ
byꢀ16ꢀbits.ꢀItꢀisꢀfabricatedꢀusingꢀISSI'sꢀhigh-performanceꢀ
CMOSꢀtechnology.ꢀThisꢀhighlyꢀreliableꢀprocessꢀcoupledꢀ
withꢀ innovativeꢀ circuitꢀ designꢀ techniques,ꢀ yieldsꢀ high-
performanceꢀandꢀlowꢀpowerꢀconsumptionꢀdevices.
•ꢀ High-speedꢀaccessꢀtime:ꢀ8,ꢀ10ꢀns
•ꢀ LowꢀActiveꢀPower:ꢀ85ꢀmWꢀ(typical)
•ꢀ LowꢀStandbyꢀPower:ꢀ7ꢀmWꢀ(typical)ꢀ
CMOSꢀstandby
•ꢀ Singleꢀpowerꢀsupply
ꢀ —ꢀꢀVddꢀ2.4Vꢀtoꢀ3.6Vꢀ(10ꢀns)
—ꢀꢀVdd 3.3Vꢀ ꢀ10%ꢀ(8ꢀns)
WhenꢀCEꢀisꢀHIGHꢀ(deselected),ꢀtheꢀdeviceꢀassumesꢀaꢀ
standbyꢀmodeꢀatꢀwhichꢀtheꢀpowerꢀdissipationꢀcanꢀbeꢀre-
ducedꢀdownꢀwithꢀCMOSꢀinputꢀlevels.
•ꢀ Fullyꢀstaticꢀoperation:ꢀnoꢀclockꢀorꢀrefreshꢀꢀ
required
EasyꢀmemoryꢀexpansionꢀisꢀprovidedꢀbyꢀusingꢀChipꢀEnableꢀ
andꢀOutputꢀEnableꢀinputs,ꢀCEꢀandꢀOE.ꢀTheꢀactiveꢀLOWꢀ
WriteꢀEnableꢀ(WE)ꢀcontrolsꢀbothꢀwritingꢀandꢀreadingꢀofꢀtheꢀ
memory.ꢀꢀAꢀdataꢀbyteꢀallowsꢀUpperꢀByteꢀ(UB)ꢀandꢀLowerꢀ
Byteꢀ(LB)ꢀaccess.
•ꢀ Threeꢀstateꢀoutputs
•ꢀ Dataꢀcontrolꢀforꢀupperꢀandꢀlowerꢀbytes
•ꢀ IndustrialꢀandꢀAutomotiveꢀtemperatureꢀsupport
•ꢀ Lead-freeꢀavailable
•ꢀ ErrorꢀDetectionꢀandꢀErrorꢀCorrection
TheꢀIS61/64WV25616EDBLLꢀisꢀꢀpackagedꢀinꢀtheꢀJEDECꢀ
standardꢀ44-pinꢀTSOP-IIꢀꢀandꢀ48-pinꢀMiniꢀBGAꢀ(6mmꢀxꢀ
8mm).
FUNCTIONAL BLOCK DIAGRAM
Memory
Lower IO
Array-
Memory
Upper IO
Array-
A0-A17
ECC
Array-
256K
x4
ECC
Array-
256K
x4
Decoder
256Kx8
256Kx8
8
4
8
4
8
8
8
8
12
12
IO0-7
ECC
ECC
I/O Data
Circuit
Column I/O
IO8-15
/CE
/OE
/WE
/UB
/LB
Control
Circuit
Copyrightꢀ©ꢀ2011ꢀIntegratedꢀSiliconꢀSolution,ꢀInc.ꢀꢀAllꢀrightsꢀreserved.ꢀꢀISSIꢀreservesꢀtheꢀrightꢀtoꢀmakeꢀchangesꢀtoꢀthisꢀspecificationꢀandꢀitsꢀproductsꢀatꢀanyꢀtimeꢀwithoutꢀ
notice.ꢀꢀꢀISSIꢀassumesꢀnoꢀliabilityꢀarisingꢀoutꢀofꢀtheꢀapplicationꢀorꢀuseꢀofꢀanyꢀinformation,ꢀproductsꢀorꢀservicesꢀdescribedꢀherein.ꢀCustomersꢀareꢀadvisedꢀtoꢀobtainꢀtheꢀlat-
estꢀversionꢀofꢀthisꢀdeviceꢀspecificationꢀbeforeꢀrelyingꢀonꢀanyꢀpublishedꢀinformationꢀandꢀbeforeꢀplacingꢀordersꢀforꢀproducts.
IntegratedꢀSiliconꢀSolution,ꢀInc.ꢀdoesꢀnotꢀrecommendꢀtheꢀuseꢀofꢀanyꢀofꢀitsꢀproductsꢀinꢀlifeꢀsupportꢀapplicationsꢀwhereꢀtheꢀfailureꢀorꢀmalfunctionꢀofꢀtheꢀproductꢀcanꢀreason-
ablyꢀbeꢀexpectedꢀtoꢀcauseꢀfailureꢀofꢀtheꢀlifeꢀsupportꢀsystemꢀorꢀtoꢀsignificantlyꢀaffectꢀitsꢀsafetyꢀorꢀeffectiveness.ꢀProductsꢀareꢀnotꢀauthorizedꢀforꢀuseꢀinꢀsuchꢀapplicationsꢀ
unlessꢀIntegratedꢀSiliconꢀSolution,ꢀInc.ꢀreceivesꢀwrittenꢀassuranceꢀtoꢀitsꢀsatisfaction,ꢀthat:
a.)ꢀtheꢀriskꢀofꢀinjuryꢀorꢀdamageꢀhasꢀbeenꢀminimized;
b.)ꢀtheꢀuserꢀassumeꢀallꢀsuchꢀrisks;ꢀand
c.)ꢀpotentialꢀliabilityꢀofꢀIntegratedꢀSiliconꢀSolution,ꢀIncꢀisꢀadequatelyꢀprotectedꢀunderꢀtheꢀcircumstancesꢀꢀ
Integrated Silicon Solution, Inc. — www.issi.comꢀ
1
Rev. A
09/29/2011