IS42VS16400E-75TL datasheet(4/58 Pages) ISSI

Part #	IS42VS16400E-75TL

Description	Random column address every clock cycle

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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IS42VS16400E

4

Integrated Silicon Solution, Inc. — www.issi.com

Rev. A

05/15/09

PIN FUNCTIONS

Symbol

Pin No.

Type

Function (In Detail)

A0-A11

23to26

InputPin

AddressInputs:A0-A11aresampledduringtheACTIVE

29to34

command(row-addressA0-A11)andREAD/WRITEcommand(A0-A7

22,35

withA10definingautoprecharge)toselectonelocationoutofthememoryarray

intherespectivebank.A10issampledduringaPRECHARGEcommandtodeter-

mineifallbanksaretobeprecharged(A10HIGH)orbankselectedby

BA0,BA1(LOW).Theaddressinputsalsoprovidetheop-codeduringaLOAD

MODEREGISTERcommand.

BA0,BA1

20,21

InputPin

BankSelectAddress:BA0andBA1defineswhichbanktheACTIVE,READ,WRITE

orPRECHARGEcommandisbeingapplied.Thesepinsalsoselectbetweenthe

moderegisterandtheextendedmoderegister.

CAS

17

InputPin

CAS

, in conjunction with the RAS and WE, forms the device command. See the

"Command Truth Table" for details on device commands.

CKE

37

InputPin

TheCKEinputdetermineswhethertheCLKinputisenabled.Thenextrisingedge

oftheCLKsignalwillbevalidwhenisCKEHIGHandinvalidwhenLOW.WhenCKE

isLOW,thedevicewillbeineitherpower-downmode,clocksuspendmode,orself

refresh mode. CKEisan asynchronous input.

CLK

38

InputPin

CLKisthemasterclockinputforthisdevice.ExceptforCKE,allinputstothisdevice

areacquiredinsynchronizationwiththerisingedgeofthispin.

CS

19

InputPin

The CS input determines whether command input is enabled within the device.

Command input is enabled when CSisLOW,anddisabledwithCSisHIGH.The

device remains in the previous state when CSisHIGH.

DQ0to

2,4,5,7,8,10,

DQPin

DQ0toDQ15areI/Opins.I/Othroughthesepinscanbecontrolledinbyteunits

DQ15

11,13,42,44,45,

usingtheLDQMandUDQMpins.

47,48,50,51,53

LDQM,

15,39

InputPin

LDQMandUDQMcontrolthelowerandupperbytesoftheI/Obuffers.Inread

UDQM

mode,LDQMandUDQMcontroltheoutputbuffer.WhenLDQMorUDQMisLOW,

thecorrespondingbufferbyteisenabled,andwhenHIGH,disabled.Theoutputs

gototheHIGHimpedancestatewhenLDQM/UDQMisHIGH.Thisfunctioncor-

responds to OEinconventionalDRAMs.Inwritemode,LDQMandUDQMcontrol

theinputbuffer.WhenLDQMorUDQMisLOW,thecorrespondingbufferbyteisen-

abled,anddatacanbewrittentothedevice.WhenLDQMorUDQMisHIGH,input

data is masked and cannot be written to the device.

RAS

18

InputPin

RAS

, in conjunction with CAS and WE, forms the device command. See the "Com-

mand Truth Table" item for details on device commands.

WE

16

InputPin

WE

, in conjunction with RAS and CAS, forms the device command. See the "Com-

mand Truth Table" item for details on device commands.

VDDq

3,9,43,49

PowerSupplyPinVDDq is the output buffer power supply.

VDD

1,14,27

PowerSupplyPinVDD is the device internal power supply.

GNDq

6,12,46,52

PowerSupplyPinGNDq is the output buffer ground.

GND

28,41,54

PowerSupplyPinGND is the device internal ground.

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IS42VS16400E-75TL Datasheet(PDF) 4 Page - Integrated Silicon Solution, Inc

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