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| 型號(hào)： | IDT72T18115L6-7BB |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 34/55頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FIFO 262KX18 6-7NS 240BGA |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | 72T |
| 功能： | 異步 |
| 存儲(chǔ)容量： | 4.7Mb（262k x 18） |
| 數(shù)據(jù)速率： | 10MHz |
| 訪問時(shí)間： | 3.8ns |
| 電源電壓： | 2.375 V ~ 2.625 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 240-BGA |
| 供應(yīng)商設(shè)備封裝： | 240-PBGA（19x19） |
| 包裝： | 托盤 |
| 其它名稱： | 72T18115L6-7BB |
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COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72T1845/55/65/75/85/95/105/115/125 2.5V TeraSync 18-BIT/9-BIT FIFO 2Kx18/4Kx9, 4Kx18/
8Kx9, 8Kx18/16Kx9, 16Kx18/32Kx9, 32Kx18/64Kx9, 64Kx18/128Kx9, 128Kx18/256Kx9, 256Kx18/512Kx9, 512Kx18/1Mx9
FEBRUARY 10, 2009
DESCRIPTION:
The IDT72T1845/72T1855/72T1865/72T1875/72T1885/72T1895/
72T18105/72T18115/72T18125 are exceptionally deep, extremely high
speed, CMOS First-In-First-Out (FIFO) memories with clocked read and write
controls and a flexible Bus-Matching x18/x9 data flow. These FIFOs offer
several key user benefits:
Flexible x18/x9 Bus-Matching on both read and write ports
A user selectable MARK location for retransmit
User selectable I/O structure for HSTL or LVTTL
Asynchronous/Synchronous translation on the read or write ports
The first word data latency period, from the time the first word is written to an
empty FIFO to the time it can be read, is fixed and short.
High density offerings up to 9 Mbit
Bus-Matching TeraSync FIFOs are particularly appropriate for network,
video, telecommunications, data communications and other applications that
need to buffer large amounts of data and match busses of unequal sizes.
Each FIFO has a data input port (Dn) and a data output port (Qn), both of
which can assume either a 18-bit or a 9-bit width as determined by the state of
external control pins Input Width (IW) and Output Width (OW) pin during the
Master Reset cycle.
TheinputportcanbeselectedaseitheraSynchronous(clocked)interface,
or Asynchronous interface. During Synchronous operation the input port is
controlledbyaWriteClock(WCLK)inputandaWriteEnable(
WEN)input. Data
present on the Dn data inputs is written into the FIFO on every rising edge of
WCLK when
WEN is asserted. During Asynchronous operation only the WR
input is used to write data into the FIFO. Data is written on a rising edge of WR,
the
WEN input should be tied to its active state, (LOW).
TheoutputportcanbeselectedaseitheraSynchronous(clocked)interface,
or Asynchronous interface. During Synchronous operation the output port is
controlled by a Read Clock (RCLK) input and Read Enable (
REN)input. Data
is read from the FIFO on every rising edge of RCLK when
REN is asserted.
During Asynchronous operation only the RD input is used to read data from the
FIFO. Data is read on a rising edge of RD, the
REN input should be tied to its
activestate,LOW.WhenAsynchronousoperationisselectedontheoutputport
the FIFO must be configured for Standard IDT mode, also the
RCSshouldbe
tiedLOWandthe
OEinputusedtoprovidethree-statecontroloftheoutputs,Qn.
The output port can be selected for either 2.5V LVTTL or HSTL operation,
thisoperationisselectedbythestateoftheRHSTLinputduringamasterreset.
AnOutputEnable(
OE)inputisprovidedforthree-statecontroloftheoutputs.
AReadChipSelect(
RCS)inputisalsoprovided,theRCSinputissynchronized
to the read clock, and also provides three-state control of the Qn data outputs.
When
RCS is disabled, the data outputs will be high impedance. During
Asynchronousoperationoftheoutputport,
RCSshouldbeenabled,heldLOW.
Echo Read Enable,
EREN and Echo Read Clock, ERCLK outputs are
provided. These are outputs from the read port of the FIFO that are required
forhighspeeddatacommunication,toprovidetightersynchronizationbetween
the data being transmitted from the Qn outputs and the data being received by
theinputdevice.Datareadfromthereadportisavailableontheoutputbuswith
respect to
EREN and ERCLK, this is very useful when data is being read at
highspeed.TheERCLKand
ERENoutputsarenon-functionalwhentheRead
port is setup for Asynchronous mode.
The frequencies of both the RCLK and the WCLK signals may vary from 0
tofMAXwithcompleteindependence. Therearenorestrictionsonthefrequency
of the one clock input with respect to the other.
There are two possible timing modes of operation with these devices: IDT
Standard mode and First Word Fall Through (FWFT) mode.
InIDTStandardmode,thefirstwordwrittentoanemptyFIFOwillnotappear
on the data output lines unless a specific read operation is performed. A read
operation, which consists of activating
RENandenablingarisingRCLKedge,
will shift the word from internal memory to the data output lines.
In FWFT mode, the first word written to an empty FIFO is clocked directly
to the data output lines after three transitions of the RCLK signal. A
RENdoes
not have to be asserted for accessing the first word. However, subsequent
words written to the FIFO do require a LOW on
REN for access. The state of
the FWFT/SI input during Master Reset determines the timing mode in use.
For applications requiring more data storage capacity than a single FIFO
canprovide,theFWFTtimingmodepermitsdepthexpansionbychainingFIFOs
in series (i.e. the data outputs of one FIFO are connected to the corresponding
data inputs of the next). No external logic is required.
These FIFOs have five flag pins,
EF/OR (Empty Flag or Output Ready),
FF/IR (Full Flag or Input Ready), HF (Half-full Flag), PAE (Programmable
Almost-Emptyflag)and
PAF(ProgrammableAlmost-Fullflag). TheEFandFF
functions are selected in IDT Standard mode. The
IR and OR functions are
selected in FWFT mode.
HF, PAE and PAF are always available for use,
irrespective of timing mode.
PAE and PAFcanbeprogrammedindependentlytoswitchatanypointin
memory. Programmableoffsetsdeterminetheflagswitchingthresholdandcan
beloadedbytwomethods:parallelorserial. Eightdefaultoffsetsettingsarealso
provided, so that
PAEcanbesettoswitchatapredefinednumberoflocations
from the empty boundary and the
PAF threshold can also be set at similar
predefinedvaluesfromthefullboundary. Thedefaultoffsetvaluesaresetduring
Master Reset by the state of the FSEL0, FSEL1, and
LD pins.
For serial programming,
SEN together with LD on each rising edge of
SCLK, are used to load the offset registers via the Serial Input (SI). For parallel
programming,
WEN together withLD oneachrisingedgeofWCLK,areused
to load the offset registers via Dn.
REN together with LD on each rising edge
ofRCLKcanbeusedtoreadtheoffsetsinparallelfromQnregardlessofwhether
serial or parallel offset loading has been selected.
During Master Reset (
MRS)thefollowingeventsoccur: thereadandwrite
pointers are set to the first location of the FIFO. The FWFT pin selects IDT
Standard mode or FWFT mode.
The Partial Reset (
PRS) also sets the read and write pointers to the first
location of the memory. However, the timing mode, programmable flag
programmingmethod,anddefaultorprogrammedoffsetsettingsexistingbefore
PartialResetremainunchanged.Theflagsareupdatedaccordingtothetiming
modeandoffsetsineffect.
PRSisusefulforresettingadeviceinmid-operation,
when reprogramming programmable flags would be undesirable.
Itisalsopossibletoselectthetimingmodeofthe
PAE(ProgrammableAlmost-
Empty flag) and
PAF (Programmable Almost-Full flag) outputs. The timing
modes can be set to be either asynchronous or synchronous for the
PAEand
PAFflags.
If asynchronous
PAE/PAF configuration is selected, the PAE is asserted
LOWontheLOW-to-HIGHtransitionofRCLK.
PAEisresettoHIGHontheLOW-
to-HIGH transition of WCLK. Similarly, the
PAFisassertedLOWontheLOW-
to-HIGH transition of WCLK and
PAF is reset to HIGH on the LOW-to-HIGH
transition of RCLK.
Ifsynchronous
PAE/PAFconfigurationisselected,thePAEisassertedand
updated on the rising edge of RCLK only and not WCLK. Similarly,
PAF is
assertedandupdatedontherisingedgeofWCLKonlyandnotRCLK.Themode
desiredisconfiguredduringMasterResetbythestateoftheProgrammableFlag
Mode (PFM) pin.
ThisdeviceincludesaRetransmitfromMarkfeaturethatutilizestwocontrol
inputs, MARK and ,
RT(Retransmit).IftheMARKinputisenabledwithrespect
to the RCLK, the memory location being read at that point will be marked. Any
subsequent retransmit operation,
RTgoesLOW,willresetthereadpointerto
this‘marked’location.
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| IDT72T18125L10BB | 功能描述:IC FIFO 524X18 2.5V 10NS 240BGA RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:72T 標(biāo)準(zhǔn)包裝:90 系列:74ABT 功能:同步，雙端口 存儲(chǔ)容量:4.6K（64 x 36 x2） 數(shù)據(jù)速率:67MHz 訪問時(shí)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(yīng)商設(shè)備封裝:120-HLQFP（14x14） 包裝:托盤 產(chǎn)品目錄頁面:1005 (CN2011-ZH PDF) 其它名稱:296-3984 |
| IDT72T18125L4-4BB | 功能描述:IC FIFO 524X18 2.5V 4NS 240BGA RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:72T 標(biāo)準(zhǔn)包裝:15 系列:74F 功能:異步 存儲(chǔ)容量:256（64 x 4） 數(shù)據(jù)速率:- 訪問時(shí)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(yīng)商設(shè)備封裝:24-PDIP 包裝:管件 其它名稱:74F433 |
| IDT72T18125L4-4BBG | 功能描述:IC FIFO 524X18 2.5V 4NS 240BGA RoHS:是 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:72T 標(biāo)準(zhǔn)包裝:90 系列:74ABT 功能:同步，雙端口 存儲(chǔ)容量:4.6K（64 x 36 x2） 數(shù)據(jù)速率:67MHz 訪問時(shí)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(yīng)商設(shè)備封裝:120-HLQFP（14x14） 包裝:托盤 產(chǎn)品目錄頁面:1005 (CN2011-ZH PDF) 其它名稱:296-3984 |
| IDT72T18125L5BB | 功能描述:IC FIFO 524X18 2.5V 5NS 240BGA RoHS:否 類別:集成電路 (IC) >> 邏輯 - FIFO 系列:72T 標(biāo)準(zhǔn)包裝:15 系列:74F 功能:異步 存儲(chǔ)容量:256（64 x 4） 數(shù)據(jù)速率:- 訪問時(shí)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(yīng)商設(shè)備封裝:24-PDIP 包裝:管件 其它名稱:74F433 |
| IDT72T18125L5BBGI | 制造商:Integrated Device Technology Inc 功能描述:IC FIFO 524X18 2.5V 5NS 240BGA |
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