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參數(shù)資料
| 型號： | IDT72V04L15J |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 0K |
| 描述： | IC FIFO ASYNCH 4KX9 15NS 32PLCC |
| 標準包裝： | 32 |
| 系列： | 72V |
| 功能： | 異步 |
| 存儲容量： | 36K（4K x 9） |
| 訪問時間： | 15ns |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-LCC（J 形引線） |
| 供應商設(shè)備封裝： | 32-PLCC（13.97x11.43） |
| 包裝： | 管件 |
| 其它名稱： | 72V04L15J |
4
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72V01/72V02/72V03/72V04/72V05/72V06 3.3V ASYNCHRONOUS FIFO
512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9 and 16,384 x 9
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 taken to a LOW
state. During reset, both internal read and write pointers are set to the first
location. A reset is required after power up before a write operation can take
place. Both the Read Enable (R) and Write Enable (W) inputs must be
in the HIGH state during the window shown in Figure 2, (i.e., tRSS
before the rising edge of RS ) and should not change until tRSR after
the rising edge of RS. Half-Full Flag (HF) will be reset to HIGH after
Reset (RS).
WRITE ENABLE (W)
A write cycle is initiated on the falling edge of this input if the Full Flag (FF)
isnotset. Datasetupandholdtimesmustbeadheredtowithrespecttotherising
edgeoftheWriteEnable(W). DataisstoredintheRAMarraysequentiallyand
independently of any ongoing read operation.
After half of the memory is filled and at the falling edge of the next write
operation,theHalf-FullFlag(HF)willbesettoLOWandwillremainsetuntilthe
difference between the write pointer and read pointer is less than or equal to
onehalfofthetotalmemoryofthedevice. TheHalf-FullFlag(HF)isthenreset
by the rising edge of the read operation.
Topreventdataoverflow,theFullFlag(FF)willgoLOW,inhibitingfurther
write operations. Upon the completion of a valid read operation, the Full Flag
(FF) will go HIGH after tRFF, allowing a valid write to begin. When the FIFO
isfull,theinternalwritepointerisblockedfromW,soexternalchangesinWwill
notaffecttheFIFOwhenitisfull.
READ ENABLE (R)
AreadcycleisinitiatedonthefallingedgeoftheReadEnable(R)provided
theEmptyFlag(EF)isnotset.ThedataisaccessedonaFirst-In/First-Outbasis,
independent of any ongoing write operations. After Read Enable (R) goes
HIGH,theDataOutputs(Q0–Q8)willreturntoahighimpedanceconditionuntil
thenextReadoperation. WhenalldatahasbeenreadfromtheFIFO,theEmpty
Flag(EF)willgoLOW,allowingthe“final”readcyclebutinhibitingfurtherread
operationswiththedataoutputsremaininginahighimpedancestate.Oncea
validwriteoperationhasbeenaccomplished,theEmptyFlag(EF)willgoHIGH
aftertWEFandavalidReadcanthenbegin. WhentheFIFOisempty,theinternal
readpointerisblockedfromRsoexternalchangesinRwillnotaffecttheFIFO
when it is empty.
FIRST LOAD/RETRANSMIT (FL/RT)
This is a dual-purpose input. In the Depth Expansion Mode, this pin is
groundedtoindicatethatitisthefirstloaded(seeOperatingModes).IntheSingle
DeviceMode,thispinactsastheretransmitinput. TheSingleDeviceModeis
initiated by grounding the Expansion In (XI).
TheseFIFOscanbemadetoretransmitdatawhentheRetransmitEnable
control(RT)inputispulsedLOW. Aretransmitoperationwillsettheinternalread
pointertothefirstlocationandwillnotaffectthewritepointer.ReadEnable(R)
andWriteEnable(W)mustbeintheHIGHstateduringretransmit.Thisfeature
is useful when less than 512/1,024/2,048/4,096/8,192/16,384 writes are
performed between resets. The retransmit feature is not compatible with the
Depth Expansion Mode and will affect the Half-Full Flag (HF), depending on
the relative locations of the read and write pointers.
EXPANSION IN (XI)
Thisinputisadual-purposepin.ExpansionIn(XI)isgroundedtoindicate
an operation in the single device mode. Expansion In (XI) is connected to
Expansion Out (XO) of the previous device in the Depth Expansion or Daisy
Chain Mode.
OUTPUTS:
FULL FLAG (FF)
TheFullFlag(FF)willgoLOW,inhibitingfurtherwriteoperation,whenthe
writepointerisonelocationlessthanthereadpointer,indicatingthatthedevice
is full. If the read pointer is not moved after Reset (RS), the Full-Flag (FF)will
go LOW after 512/1,024/2,048/4,096/8,192/16,384 writes to the IDT72V01/
72V02/72V03/72V04/72V05/72V06.
EMPTY FLAG (EF)
TheEmptyFlag(EF)willgoLOW,inhibitingfurtherreadoperations,when
thereadpointerisequaltothewritepointer,indicatingthatthedeviceisempty.
EXPANSION OUT/HALF-FULL FLAG (XO/HF)
Thisisadual-purposeoutput. Inthesingledevicemode,whenExpansion
In (XI) is grounded, this output acts as an indication of a half-full memory.
After half of the memory is filled and at the falling edge of the next write
operation,theHalf-FullFlag(HF)willbesetLOWandwillremainsetuntilthe
difference between the write pointer and read pointer is less than or equal to
onehalfofthetotalmemoryofthedevice.TheHalf-FullFlag(HF)isthenreset
by using rising edge of the read operation.
IntheDepthExpansionMode,ExpansionIn(XI)isconnectedtoExpansion
Out(XO)ofthepreviousdevice.Thisoutputactsasasignaltothenextdevice
in the Daisy Chain by providing a pulse to the next device when the previous
devicereachesthelastlocationofmemory.
DATA OUTPUTS (Q0 – Q8)
Dataoutputsfor9-bitwidedata. Thisdataisinahighimpedancecondition
whenever Read (R) is in a HIGH state.
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| IDT72V04L25J | 功能描述:IC FIFO ASYNCH 4KX9 25NS 32PLCC RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:72V 標準包裝:80 系列:7200 功能:同步 存儲容量:18.4K（1K x 18） 數(shù)據(jù)速率:- 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 供應商設(shè)備封裝:64-TQFP（10x10） 包裝:托盤 其它名稱:72225LB10TF |
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