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參數資料
| 型號： | IDT72281L20TFI8 |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數： | 18/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FIFO 32768X18 LP 20NS 64QFP |
| 標準包裝： | 1,250 |
| 系列： | 7200 |
| 功能： | 同步 |
| 存儲容量： | 589K（32K x 18） |
| 數據速率： | 50MHz |
| 訪問時間： | 20ns |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-LQFP |
| 供應商設備封裝： | 64-TQFP（10x10） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 72281L20TFI8 |
25
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72281/72291
CMOS SuperSync FIFO 65,536 x 9 and 131,072 x 9
DEPTH EXPANSION CONFIGURATION (FWFT MODE ONLY)
TheIDT72281caneasilybeadaptedtoapplicationsrequiringdepthsgreater
than 65,536 and 131,072 for the IDT72291 with a 9-bit bus width. In FWFT
mode, the FIFOs can be connected in series (the data outputs of one FIFO
connectedtothedatainputsofthenext)withnoexternallogicnecessary.The
resultingconfigurationprovidesatotaldepthequivalenttothesumofthedepths
associatedwitheachsingleFIFO.Figure24showsadepthexpansionusing
two IDT72281/72291 devices.
CareshouldbetakentoselectFWFTmodeduringMasterResetforallFIFOs
in the depth expansion configuration. The first word written to an empty
configurationwillpassfromoneFIFOtothenext("rippledown")untilitfinally
appears at the outputs of the last FIFO in the chain–no read operation is
necessarybuttheRCLKofeachFIFOmustbefree-running.Eachtimethedata
word appears at the outputs of one FIFO, that device's OR line goes LOW,
enabling a write to the next FIFO in line.
Foranemptyexpansionconfiguration,theamountoftimeittakesforORof
thelastFIFOinthechaintogoLOW(i.e.validdatatoappearonthelastFIFO's
outputs)afterawordhasbeenwrittentothefirstFIFOisthesumofthedelays
for each individual FIFO:
(N – 1)*(4*transfer clock) + 3*TRCLK
whereNisthenumberofFIFOsintheexpansionandTRCLKistheRCLKperiod.
Note that extra cycles should be added for the possibility that the tSKEW3
specificationisnotmetbetweenWCLKandtransferclock,orRCLKandtransfer
clock,fortheORflag.
The"rippledown"delayisonlynoticeableforthefirstwordwrittentoanempty
depthexpansionconfiguration.Therewillbenodelayevidentforsubsequent
wordswrittentotheconfiguration.
The first free location created by reading from a full depth expansion
configurationwill"bubbleup"fromthelastFIFOtothepreviousoneuntilitfinally
movesintothefirstFIFOofthechain.Eachtimeafreelocationiscreatedinone
FIFOofthechain,thatFIFO'sIRlinegoesLOW,enablingtheprecedingFIFO
to write a word to fill it.
Forafullexpansionconfiguration,theamountoftimeittakesforIRofthefirst
FIFO in the chain to go LOW after a word has been read from the last FIFO is
the sum of the delays for each individual FIFO:
(N – 1)*(3*transfer clock) + 2 TWCLK
where N is the number of FIFOs in the expansion and TWCLK is the WCLK
period.NotethatextracyclesshouldbeaddedforthepossibilitythatthetSKEW1
specificationisnotmetbetweenRCLKandtransferclock,orWCLKandtransfer
clock, for the IR flag.
TheTransferClocklineshouldbetiedtoeitherWCLKorRCLK,whichever
isfaster.Boththeseactionsresultindatamoving,asquicklyaspossible,tothe
end of the chain and free locations to the beginning of the chain.
Figure 22. Block Diagram of 131,072 x 9 and 262,144 x 9 Depth Expansion
Dn
INPUT READY
WRITE ENABLE
WRITE CLOCK
WEN
WCLK
IR
DATA IN
RCLK
READ CLOCK
RCLK
REN
OE
OUTPUT ENABLE
OUTPUT READY
Qn
Dn
IR
GND
WEN
WCLK
OR
REN
OE
Qn
READ ENABLE
OR
DATA OUT
IDT
72281
72291
TRANSFER CLOCK
4675 drw 25
n
FWFT/SI
IDT
72281
72291
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相關代理商/技術參數 |
參數描述 |
|---|---|
| IDT72285L10PF | 功能描述:IC FIFO 65536X18 LP 10NS 64-TQFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:15 系列:74F 功能:異步 存儲容量:256（64 x 4） 數據速率:- 訪問時間:- 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:24-DIP（0.300"，7.62mm） 供應商設備封裝:24-PDIP 包裝:管件 其它名稱:74F433 |
| IDT72285L10PF8 | 功能描述:IC FIFO 65536X18 LP 10NS 64-TQFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:15 系列:74F 功能:異步 存儲容量:256（64 x 4） 數據速率:- 訪問時間:- 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:24-DIP（0.300"，7.62mm） 供應商設備封裝:24-PDIP 包裝:管件 其它名稱:74F433 |
| IDT72285L10PFG | 功能描述:IC FIFO 65536X18 10NS 64TQFP RoHS:是 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:15 系列:74F 功能:異步 存儲容量:256（64 x 4） 數據速率:- 訪問時間:- 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:24-DIP（0.300"，7.62mm） 供應商設備封裝:24-PDIP 包裝:管件 其它名稱:74F433 |
| IDT72285L10PFG8 | 制造商:Integrated Device Technology Inc 功能描述:IC FIFO 65536X18 LP 10NS 64-TQFP |
| IDT72285L10TF | 功能描述:IC FIFO SUPSYNC 65536X18 64QFP RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:7200 標準包裝:90 系列:74ABT 功能:同步，雙端口 存儲容量:4.6K（64 x 36 x2） 數據速率:67MHz 訪問時間:- 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:120-LQFP 裸露焊盤 供應商設備封裝:120-HLQFP（14x14） 包裝:托盤 產品目錄頁面:1005 (CN2011-ZH PDF) 其它名稱:296-3984 |
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