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參數(shù)資料
| 型號： | IDT7207L25P |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 11/14頁 |
| 文件大小： | 0K |
| 描述： | IC FIFO 16384X18 25NS 28DIP |
| 標準包裝： | 13 |
| 系列： | 7200 |
| 功能： | 異步 |
| 存儲容量： | 288K（32K x 9） |
| 數(shù)據(jù)速率： | 28.5MHz |
| 訪問時間： | 25ns |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 28-PDIP |
| 包裝： | 管件 |
| 其它名稱： | 7207L25P |
6
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
IDT7203/7204/7205/7206/7207/7208 CMOS ASYNCHRONOUS FIFO
2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9 and 65,536 x 9
loaded(seeOperatingModes).TheSingleDeviceModeisinitiatedbygrounding
the Expansion In (XI).
TheIDT7203/7204/7205/7206/7207/7208canbemadetoretransmitdata
when the Retransmit Enable Control (RT) input is pulsed LOW. A retransmit
operationwillsettheinternalreadpointertothefirstlocationandwillnotaffectthe
writepointer. ThestatusoftheFlagswillchangedependingontherelativelocations
of the read and write pointers. Read Enable (R) and Write Enable (W) must be
intheHIGHstateduringretransmit. Thisfeatureisusefulwhenlessthan2,048/
4,096/8,192/16,384/32,768/65,536writesareperformedbetweenresets. The
retransmitfeatureisnotcompatiblewiththeDepthExpansionMode.
EXPANSIONIN(XI)—Thisinputisadual-purposepin. ExpansionIn(XI)
isgroundedtoindicateanoperationinthesingledevicemode. ExpansionIn(XI)
isconnectedtoExpansionOut(XO)ofthepreviousdeviceintheDepthExpansion
or Daisy-Chain Mode.
OUTPUTS:
FULLFLAG
(FF)—TheFullFlag(FF)willgoLOW,inhibitingfurtherwrite
operations,whenthedeviceisfull. IfthereadpointerisnotmovedafterReset(RS),
the Full Flag (FF) will go LOW after 2,048/4,096/8,192/16,384/32,768/65,536
writes.
EMPTYFLAG(EF)—TheEmptyFlag(EF)willgoLOW,inhibitingfurther
readoperations,whenthereadpointerisequaltothewritepointer,indicatingthat
thedeviceisempty.
EXPANSIONOUT/HALF-FULLFLAG(XO/HF)—Thisisadual-purpose
output. Inthesingledevicemode,whenExpansionIn(XI)isgrounded,thisoutput
actsasanindicationofahalf-fullmemory.
Afterhalfofthememoryisfilled,andatthefallingedgeofthenextwriteoperation,
theHalf-FullFlag(HF)willbesettoLOWandwillremainsetuntilthedifference
betweenthewritepointerandreadpointerislessthanorequaltoonehalfofthe
totalmemoryofthedevice. TheHalf-FullFlag(HF)isthenresetbytherisingedge
ofthereadoperation.
IntheDepthExpansionMode,ExpansionIn(XI)isconnectedtoExpansion
Out (XO)ofthepreviousdevice. Thisoutputactsasasignaltothenextdevice
intheDaisyChainbyprovidingapulsetothenextdevicewhenthepreviousdevice
reachesthelastlocationofmemory. TherewillbeanXOpulsewhentheWrite
pointerreachesthelastlocationofmemory,andanadditionalXOpulsewhenthe
Readpointerreachesthelastlocationofmemory.
DATA OUTPUTS (Q0-Q8) — Q0-Q8 are data outputs for 9-bit wide data.
Theseoutputsareinahigh-impedanceconditionwheneverRead(R)isinaHIGH
state.
SIGNAL DESCRIPTIONS
INPUTS:
DATA IN (D0–D8)
— Data inputs for 9-bit wide data.
CONTROLS:
RESET ( RS ) — Reset is accomplished whenever the Reset (RS) input is
takentoaLOWstate. Duringreset,bothinternalreadandwritepointersareset
tothefirstlocation.Aresetisrequiredafterpower-upbeforeawriteoperationcan
take place. Both the Read Enable (R) and Write Enable (W) inputs must
beintheHIGHstateduringthewindowshowninFigure2(i.e.tRSSbefore
the rising edge of RS) and should not change until tRSR after the rising
edge of RS.
WRITE ENABLE ( W ) — A write cycle is initiated on the falling edge of this
inputiftheFullFlag(FF)isnotset.Dataset-upandholdtimesmustbeadhered-
to,withrespecttotherisingedgeoftheWriteEnable(W).DataisstoredintheRAM
array sequentially and independently of any on-going read operation.
Afterhalfofthememoryisfilled,andatthefallingedgeofthenextwriteoperation,
theHalf-FullFlag(HF)willbesettoLOW,andwillremainsetuntilthedifference
betweenthewritepointerandreadpointerisless-thanorequaltoone-halfofthe
totalmemoryofthedevice.TheHalf-FullFlag(HF)isthenresetbytherisingedge
ofthereadoperation.
Topreventdataoverflow,theFullFlag(FF)willgoLOWonthefallingedge
ofthelastwritesignal,whichinhibitsfurtherwriteoperations. Uponthecompletion
of a valid read operation, the Full Flag (FF) will go HIGH after tRFF, allowing a
newvalidwritetobegin.WhentheFIFOisfull,theinternalwritepointerisblocked
from W,soexternalchangesinW willnotaffecttheFIFOwhenitisfull.
READENABLE(R)—A readcycleisinitiatedonthefallingedgeoftheRead
Enable (R), provided the Empty Flag (EF) is not set. The data is accessed on
aFirst-In/First-Outbasis,independentofanyongoingwriteoperations. AfterRead
Enable (R) goes HIGH, the Data Outputs (Q0 through Q8) will return to a high-
impedanceconditionuntilthenextReadoperation. Whenallthedatahasbeen
read from the FIFO, the Empty Flag (EF) will go LOW, allowing the “final” read
cyclebutinhibitingfurtherreadoperations,withthedataoutputsremaininginahigh-
impedancestate.Onceavalidwriteoperationhasbeenaccomplished,theEmpty
Flag (EF) will go HIGH after tWEF and a valid Read can then begin. When the
FIFOisempty,theinternalreadpointerisblockedfromRsoexternalchangeswill
notaffecttheFIFOwhenitisempty.
FIRST LOAD/RETRANSMIT ( FL/RT
) — This is a dual-purpose input. In
theDepthExpansionMode,thispinisgroundedtoindicatethatitisthefirstdevice
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| IDT7207L25PI | 功能描述:IC FIFO 16384X18 25NS 28DIP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:90 系列:7200 功能:同步 存儲容量:288K（16K x 18） 數(shù)據(jù)速率:100MHz 訪問時間:10ns 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應(yīng)商設(shè)備封裝:64-TQFP（14x14） 包裝:托盤 其它名稱:72271LA10PF |
| IDT7207L30DB | 制造商:Integrated Device Technology Inc 功能描述:IC MEM FIFO 32K X 9 ASYNC 28CDIP |
| IDT7207L30LB | 制造商:Integrated Device Technology Inc 功能描述:IC MEM FIFO 32K X 9 ASYNC 32LCC |
| IDT7207L30LB8 | 制造商:Integrated Device Technology Inc 功能描述:IC MEM FIFO 32K X 9 ASYNC 32LCC |
| IDT7207L35J | 功能描述:IC FIFO 16384X18 35NS 32PLCC RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:90 系列:7200 功能:同步 存儲容量:288K（16K x 18） 數(shù)據(jù)速率:100MHz 訪問時間:10ns 電源電壓:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應(yīng)商設(shè)備封裝:64-TQFP（14x14） 包裝:托盤 其它名稱:72271LA10PF |
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