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参数资料
| 型号： | IDT72V225L15TFI8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 22/25页 |
| 文件大小： | 0K |
| 描述： | IC FIFO SYNC 1024X18 15NS 64QFP |
| 标准包装： | 1,250 |
| 系列： | 72V |
| 功能： | 同步 |
| 存储容量： | 18.4K（1K x 18） |
| 访问时间： | 15ns |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-TQFP（10x10） |
| 包装： | 带卷 (TR) |
| 其它名称： | 72V225L15TFI8 |
6
IDT72V205/72V215/72V225/72V235/72V245 3.3V CMOS SyncFIFOTM
256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
MARCH 2013
FUNCTIONALDESCRIPTION
TIMING MODES: IDT STANDARD vs FIRST WORD FALL THROUGH
(FWFT) MODE
The IDT72V205/72V215/72V225/72V235/72V245 support two different
timing modes of operation. The selection of which mode will operate is
determinedduringconfigurationatReset(RS).Duringa RSoperation,theFirst
Load(FL),ReadExpansionInput(RXI),andWriteExpansionInput(WXI)pins
areusedtoselectthetimingmodeperthetruthtableshowninTable3.InIDT
StandardMode,thefirstwordwrittentoanemptyFIFOwillnotappearonthe
dataoutputlinesunlessaspecificreadoperationisperformed.Areadoperation,
which consists of activating Read Enable (REN) and enabling a rising Read
Clock(RCLK)edge,willshiftthewordfrominternalmemorytothedataoutput
lines.InFWFTmode,thefirstwordwrittentoanemptyFIFOisclockeddirectly
tothedataoutputlinesafter threetransitionsoftheRCLKsignal.ARENdoes
not have to be asserted for accessing the first word.
Varioussignals,bothinputandoutputsignalsoperatedifferentlydepending
onwhichtimingmodeisineffect.
IDT STANDARD MODE
In this mode, the status flags, FF, PAF, HF, PAE, and EF operate in the
manneroutlinedinTable1.TowritedataintototheFIFO,WriteEnable(WEN)
mustbeLOW.DatapresentedtotheDATAINlineswillbeclockedintotheFIFO
on subsequent transitions of the Write Clock (WCLK). After the first write is
performed,theEmptyFlag(EF)willgoHIGH.Subsequentwriteswillcontinue
tofilluptheFIFO.TheProgrammableAlmost-Emptyflag(PAE)willgoHIGH
aftern + 1wordshavebeenloadedintotheFIFO,wherenistheemptyoffset
value.ThedefaultsettingforthisvalueisstatedinthefootnoteofTable1.This
parameter is also user programmable. See section on Programmable Flag
OffsetLoading.
If one continued to write data into the FIFO, and we assumed no read
operationsweretakingplace,theHalf-FullFlag(HF)wouldtoggletoLOWonce
the129th(72V205), 257th(72V215),513th(72V225),1,025th(72V235),and
2,049th(72V245)wordrespectivelywaswrittenintotheFIFO. Continuingto
writedataintotheFIFOwillcausetheProgrammableAlmost-FullFlag(PAF)
togoLOW.Again,ifnoreadsareperformed, thePAFwillgoLOWafter(256-m)
writesfortheIDT72V205,(512-m)writesfortheIDT72V215,(1,024-m)writes
fortheIDT72V225,(2,048-m)writesfortheIDT72V235and(4,096–m)writes
fortheIDT72V245. Theoffset“m”isthefulloffsetvalue. Thisparameterisalso
userprogrammable.SeesectiononProgrammableFlagOffsetLoading. Ifthere
isnofulloffsetspecified,thePAFwillbeLOWwhenthedeviceis31awayfrom
completelyfullforIDT72V205,63awayfromcompletelyfullforIDT72V215,and
127 away from completely full for the IDT72V225/72V235/72V245.
WhentheFIFOisfull,theFullFlag(FF)willgoLOW,inhibitingfurtherwrite
operations. Ifnoreadsareperformedafterareset,FFwillgoLOWafterDwrites
totheFIFO. D=256writesfortheIDT72V205,512fortheIDT72V215,1,024
for the IDT72V225, 2,048 for the IDT72V235 and 4,096 for the IDT72V245,
respectively.
If the FIFO is full, the first read operation will cause FF to go HIGH.
SubsequentreadoperationswillcausePAFandtheHalf-FullFlag(HF)togo
HIGHattheconditionsdescribedinTable1.Iffurtherreadoperationsoccur,
withoutwriteoperations,theProgrammableAlmost-EmptyFlag(PAE)willgo
LOW when there are n words in the FIFO, where n is the empty offset value.
Ifthereisnoemptyoffsetspecified,thePAEwillbeLOWwhenthedeviceis31
awayfromcompletelyemptyforIDT72V205,63awayfromcompletelyempty
forIDT72V215,and127awayfromcompletelyemptyforIDT72V225/72V235/
72V245. Continuing read operations will cause the FIFO to be empty. When
thelastwordhasbeenreadfromtheFIFO,theEFwillgoLOWinhibitingfurther
read operations. REN is ignored when the FIFO is empty.
FIRST WORD FALL THROUGH MODE (FWFT)
In this mode, the status flags, IR, PAF, HF, PAE, and OR operate in the
manneroutlinedinTable2.TowritedataintototheFIFO,WENmustbeLOW.
DatapresentedtotheDATAINlineswillbeclockedintotheFIFOonsubsequent
transitionsofWCLK.Afterthefirstwriteisperformed,theOutputReady(OR)
flagwillgoLOW.SubsequentwriteswillcontinuetofilluptheFIFO.PAEwillgo
HIGHaftern + 2wordshavebeenloadedintotheFIFO,wherenistheempty
offsetvalue.ThedefaultsettingforthisvalueisstatedinthefootnoteofTable2.
Thisparameterisalsouserprogrammable.SeesectiononProgrammableFlag
OffsetLoading.
If one continued to write data into the FIFO, and we assumed no read
operations were taking place, the HF would toggle to LOW once the 130th
(72V205), 258th (72V215), 514th (72V225), 1,026th (72V235), and 2,050th
(72V245)wordrespectivelywaswrittenintotheFIFO. Continuingtowritedata
intotheFIFOwillcausethePAFtogoLOW.Again,ifnoreadsareperformed,
the PAF will go LOW after (257-m) writes for the IDT72V205, (513-m) writes
fortheIDT72V215,(1,025-m)writesfortheIDT72V225,(2,049–m)writesfor
the IDT72V235 and (4,097–m) writes for the IDT72V245, where m is the full
offsetvalue. ThedefaultsettingforthisvalueisstatedinthefootnoteofTable
2.
WhentheFIFOisfull,theInputReady(IR)flagwillgoHIGH,inhibitingfurther
writeoperations. Ifnoreadsareperformedafterareset,IRwillgoHIGHafter
DwritestotheFIFO. D=257writesfortheIDT72V205,513fortheIDT72V215,
1,025 for the IDT72V225, 2,049 for the IDT72V235 and 4,097 for the
IDT72V245.NotethattheadditionalwordinFWFTmodeisduetothecapacity
ofthememoryplusoutputregister.
If the FIFO is full, the first read operation will cause the IR flag to go LOW.
Subsequent read operations will cause the PAF and HF to go HIGH at the
conditionsdescribedinTable2.Iffurtherreadoperationsoccur,withoutwrite
operations,thePAEwillgoLOWwhentherearen+1wordsintheFIFO,where
nistheemptyoffsetvalue.Ifthereisnoemptyoffsetspecified,thePAEwillbe
LOW when the device is 32 away from completely empty for IDT72V205, 64
away from completely empty for IDT72V215, and 128 away from completely
emptyforIDT72V225/72V235/72V245.Continuingreadoperationswillcause
the FIFO to be empty. When the last word has been read from the FIFO, OR
willgoHIGHinhibitingfurtherreadoperations.RENisignoredwhentheFIFO
isempty.
PROGRAMMABLEFLAGLOADING
FullandEmptyflagoffsetvaluescanbeuserprogrammable.TheIDT72V205/
72V215/72V225/72V235/72V245 has internal registers for these offsets.
DefaultsettingsarestatedinthefootnotesofTable1andTable2.Offsetvalues
are loaded into the FIFO using the data input lines D0-D11. To load the offset
registers,theLoad(LD)pinandWENpinmustbeheldLOW.Datapresenton
D0-D11willbetransferredintotheEmptyOffsetregisteronthefirstLOW-to-HIGH
transitionofWCLK.BycontinuingtoholdtheLDandWENpinlow, datapresent
onD0-D11willbetransferredintotheFullOffsetregisteronthenexttransition
oftheWCLK.ThethirdtransitionagainwritestotheEmptyOffsetregister. Writing
alloffsetregistersdoesnothavetooccuratonetime.Oneortwooffsetregisters
can be written and then by bringing the LD pin HIGH, the FIFO is returned to
normal read/write operation. When the LD pin and WEN are again set LOW,
thenextoffsetregisterinsequenceiswritten.
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| IDT72V225L20PF | 功能描述:IC FIFO SYNC 1024X18 20NS 64TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:80 系列:7200 功能:同步 存储容量:18.4K（1K x 18） 数据速率:- 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（10x10） 包装:托盘 其它名称:72225LB10TF |
| IDT72V225L20PF8 | 功能描述:IC FIFO SYNC 1024X18 20NS 64TQFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:80 系列:7200 功能:同步 存储容量:18.4K（1K x 18） 数据速率:- 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（10x10） 包装:托盘 其它名称:72225LB10TF |
| IDT72V225L20TF | 功能描述:IC FIFO SYNC 1024X18 20NS 64QFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:80 系列:7200 功能:同步 存储容量:18.4K（1K x 18） 数据速率:- 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（10x10） 包装:托盘 其它名称:72225LB10TF |
| IDT72V225L20TF8 | 功能描述:IC FIFO SYNC 1024X18 20NS 64QFP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72V 标准包装:80 系列:7200 功能:同步 存储容量:18.4K（1K x 18） 数据速率:- 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（10x10） 包装:托盘 其它名称:72225LB10TF |
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