andꢀOutputꢀEnableꢀinputs.
TheꢀactiveꢀLOWWriteꢀEnableꢀ(WE)ꢀ
performanceꢀCMOSꢀtechnology.Thisꢀhighlyꢀreliableꢀprocessꢀ
IS62WV25616DALL/DBLL, IS65WV25616DBLL
256Kꢀxꢀ16ꢀLOWꢀVOLTAGE,ꢀ
ULTRAꢀLOWꢀPOWERꢀCMOSꢀSTATICꢀSRAMꢀ
ꢀ
ꢀꢀꢀꢀꢀꢀꢀ
FEBRUARYꢀ2012
FEATURES
DESCRIPTION
TheꢀISSIꢀIS62WV25616DALLꢀandꢀIS62/65WV25616DBLLꢀ
areꢀꢀhigh-speed,ꢀlowꢀpower,ꢀ4MꢀbitꢀSRAMsꢀorganizedꢀasꢀ
256Kꢀwordsꢀbyꢀ16ꢀbits.ꢀItꢀisꢀfabricatedꢀusingꢀISSI'sꢀhigh-
•ꢀ High-speedꢀaccessꢀtime:ꢀ35,ꢀ45,ꢀ55ꢀnsꢀ
•ꢀ CMOSꢀlowꢀpowerꢀoperation
ꢀ 30ꢀmWꢀ(typical)ꢀoperating
coupledꢀ withꢀ innovativeꢀ circuitꢀdesignꢀ techniques,ꢀ yieldsꢀ
high-performanceꢀandꢀlowꢀpowerꢀconsumptionꢀdevices.
ꢀ 6ꢀµWꢀ(typical)ꢀCMOSꢀstandby
•ꢀ TTLꢀcompatibleꢀinterfaceꢀlevels
•ꢀ Singleꢀpowerꢀsupplyꢀꢀ
WhenꢀCS1ꢀisꢀHIGHꢀ(deselected)ꢀꢀorꢀwhenꢀCS2ꢀisꢀLOWꢀ
(deselcted)ꢀorꢀwhenꢀCS1ꢀisꢀLOW,ꢀCS2ꢀisꢀHIGHꢀandꢀbothꢀ
LBꢀandꢀUBꢀareꢀHIGH,ꢀtheꢀdeviceꢀassumesꢀaꢀstandbyꢀmodeꢀ
atꢀwhichꢀtheꢀpowerꢀdissipationꢀcanꢀbeꢀreducedꢀdownꢀwithꢀ
CMOSꢀinputꢀlevels.
ꢀ 1.65V--2.2VꢀVdd (IS62WV25616DALL)
ꢀ 2.5V--3.6VꢀVdd ꢀ(IS62/65WV25616DBLL)
EasyꢀmemoryꢀexpansionꢀisꢀprovidedꢀbyꢀusingꢀChipꢀEnableꢀ
•ꢀ Fullyꢀstaticꢀoperation:ꢀnoꢀclockꢀorꢀrefreshꢀ
required
controlsꢀbothꢀwritingꢀandꢀreadingꢀofꢀtheꢀmemory.ꢀAꢀdataꢀbyteꢀ
allowsꢀUpperꢀByteꢀ(UB)ꢀandꢀLowerꢀByteꢀ(LB)ꢀaccess.
•ꢀ Threeꢀstateꢀoutputs
•ꢀ Dataꢀcontrolꢀforꢀupperꢀandꢀlowerꢀbytes
•ꢀ IndustrialꢀandꢀAutomotiveꢀtemperatureꢀsupport
•ꢀ Lead-freeꢀavailable
TheꢀIS62WV25616DALLꢀandꢀIS62/65WV25616DBLLꢀareꢀ
packagedꢀinꢀtheꢀJEDECꢀstandardꢀ44-PinꢀTSOPꢀ(TYPEꢀII)ꢀ
andꢀ48-pinꢀminiꢀBGAꢀ(6mmx8mm).
•ꢀ 2ꢀCSꢀoptionꢀavailable
FUNCTIONALꢀBLOCKꢀDIAGRAM
256K x 16
MEMORY ARRAY
A0-A17
DECODER
V
DD
GND
I/O0-I/O7
Lower Byte
I/O
DATA
COLUMN I/O
CIRCUIT
I/O8-I/O15
Upper Byte
CS2
CS1
OE
CONTROL
CIRCUIT
WE
UB
LB
Copyrightꢀ©ꢀ2012ꢀIntegratedꢀSiliconꢀSolution,ꢀInc.ꢀꢀAllꢀrightsꢀreserved.ꢀꢀISSIꢀreservesꢀtheꢀrightꢀtoꢀmakeꢀchangesꢀtoꢀthisꢀspecificationꢀandꢀitsꢀproductsꢀatꢀanyꢀtimeꢀwithoutꢀ
notice.ꢀꢀꢀISSIꢀassumesꢀnoꢀliabilityꢀarisingꢀoutꢀofꢀtheꢀapplicationꢀorꢀuseꢀofꢀanyꢀinformation,ꢀproductsꢀorꢀservicesꢀdescribedꢀherein.ꢀCustomersꢀareꢀadvisedꢀtoꢀobtainꢀtheꢀlat-
estꢀversionꢀofꢀthisꢀdeviceꢀspecificationꢀbeforeꢀrelyingꢀonꢀanyꢀpublishedꢀinformationꢀandꢀbeforeꢀplacingꢀordersꢀforꢀproducts.ꢀꢀ
IntegratedꢀSiliconꢀSolution,ꢀInc.ꢀdoesꢀnotꢀrecommendꢀtheꢀuseꢀofꢀanyꢀofꢀitsꢀproductsꢀinꢀlifeꢀsupportꢀapplicationsꢀwhereꢀtheꢀfailureꢀorꢀmalfunctionꢀofꢀtheꢀproductꢀcanꢀreasonablyꢀbeꢀex-
pectedꢀtoꢀcauseꢀfailureꢀofꢀtheꢀlifeꢀsupportꢀsystemꢀorꢀtoꢀsignificantlyꢀaffectꢀitsꢀsafetyꢀorꢀeffectiveness.ꢀProductsꢀareꢀnotꢀauthorizedꢀforꢀuseꢀinꢀsuchꢀapplicationsꢀunlessꢀIntegratedꢀSiliconꢀ
Solution,ꢀInc.ꢀreceivesꢀwrittenꢀassuranceꢀtoꢀitsꢀsatisfaction,ꢀthat:
a.)ꢀtheꢀriskꢀofꢀinjuryꢀorꢀdamageꢀhasꢀbeenꢀminimized;
b.)ꢀtheꢀuserꢀassumeꢀallꢀsuchꢀrisks;ꢀand
c.)ꢀpotentialꢀliabilityꢀofꢀIntegratedꢀSiliconꢀSolution,ꢀIncꢀisꢀadequatelyꢀprotectedꢀunderꢀtheꢀcircumstances
Integrated Silicon Solution, Inc. — www.issi.com ꢀ
1
Rev.ꢀ B
02/07/2012