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参数资料
| 型号： | IDT7201LA20SO8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC MEM FIFO 512X9 20NS 28-SOIC |
| 标准包装： | 1,000 |
| 系列： | 7200 |
| 功能： | 异步 |
| 存储容量： | 4.6K（512 x 9） |
| 数据速率： | 33.3MHz |
| 访问时间： | 20ns |
| 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： | 28-SOIC（0.345"，8.77mm 宽） |
| 供应商设备封装： | 28-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | 7201LA20SO8 |
6
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO
256 x 9, 512 x 9 and 1,024 x 9
DeviceMode,thispinactsastheretransmitinput. TheSingleDeviceModeis
initiated by grounding the Expansion In (XI).
The IDT7200/7201A/7202A can be made to retransmit data when the
RetransmitEnablecontrol(RT)inputispulsedLOW. Aretransmitoperationwill
settheinternalreadpointertothefirstlocationandwillnotaffectthewritepointer.
Read Enable (R) and Write Enable (W) must be in the HIGH state during
retransmit. This feature is useful when less than 256/512/1,024 writes are
performedbetweenresets. Theretransmitfeatureisnotcompatiblewiththe
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
write pointer is one location less than the read pointer, indicating that the
device is full. If the read pointer is not moved after Reset (RS), the Full-Flag
(FF)willgoLOWafter256writesforIDT7200,512writesfortheIDT7201Aand
1,024 writes for the IDT7202A.
EMPTY FLAG (EF)
TheEmptyFlag(EF)willgoLOW,inhibitingfurtherreadoperations,when
the read pointer is equal to the write pointer, indicating that the device is
empty.
EXPANSION OUT/HALF-FULL FLAG (XO/HF)
This is a dual-purpose output. In the single device mode, when
Expansion 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 one half of the total memory of the device. The Half-Full Flag (HF) is then
reset 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.
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. Dataset-upandholdtimesmustbeadheredtowithrespecttotherising
edgeoftheWriteEnable(W). DataisstoredintheRAMarraysequentiallyand
independently of any on-going 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)willgoHIGHaftertRFF,allowingavalidwritetobegin. WhentheFIFO
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
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| IDT7201LA20TDB | 制造商:Integrated Device Technology Inc 功能描述:IC MEM FIFO 512X9 ASYNC 28CDIP |
| IDT7201LA20TP | 功能描述:IC MEM FIFO 512X9 20NS 28-PDIP RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:7200 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 |
| IDT7201LA25J | 功能描述:IC MEM FIFO 512X9 25NS 32-PLCC RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:7200 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 |
| IDT7201LA25J8 | 功能描述:IC MEM FIFO 512X9 25NS 32-PLCC RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:7200 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 |
| IDT7201LA25JI | 功能描述:IC MEM FIFO 512X9 25NS 32-PLCC RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:7200 标准包装:90 系列:74ABT 功能:同步，双端口 存储容量:4.6K（64 x 36 x2） 数据速率:67MHz 访问时间:- 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:120-LQFP 裸露焊盘 供应商设备封装:120-HLQFP（14x14） 包装:托盘 产品目录页面:1005 (CN2011-ZH PDF) 其它名称:296-3984 |
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