參數(shù)資料
型號(hào): IDT7284L20PA
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 10/12頁(yè)
文件大?。?/td> 0K
描述: IC FIFO 2048X18 20NS 56TSSOP
標(biāo)準(zhǔn)包裝: 34
系列: 7200
功能: 異步
存儲(chǔ)容量: 36.8K(2K x 18)
訪問(wèn)時(shí)間: 20ns
電源電壓: 4.5 V ~ 5.5 V
工作溫度: 0°C ~ 70°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 56-TFSOP(0.240",6.10mm 寬)
供應(yīng)商設(shè)備封裝: 56-TSSOP
包裝: 管件
其它名稱: 7284L20PA
7
COMMERCIALTEMPERATURERANGE
IDT7280/7281/7282/7283/7284/7285 5V ASYNCHRONOUS FIFO
DUAL 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9
JUNE 29, 2012
Figure 9. Half-Full Flag Timing
Figure 10. Expansion Out
Figure 11. Expansion In
OPERATING MODES:
Care must be taken to assure that the appropriate flag is monitored by
eachsystem(i.e.FFismonitoredonthedevicewhereWisused;EFismonitored
on the device where R is used).
SINGLE DEVICE MODE
A single IDT7280/7281/7282/7283/7284/7285 may be used when the
applicationrequirementsarefor256/512/1,024/2,048/4,096/8,192wordsor
less. TheseFIFOsareinaSingleDeviceConfigurationwhentheExpansion
In (XI) control input is grounded (see Figure 12).
DEPTH EXPANSION
These devices can easily be adapted to applications when the require-
ments are for greater than 256/512/1,024/2,048/4,096/8,192 words. Figure
14 demonstrates a four-FIFO Depth Expansion using two IDT7280/7281/
7282/7283/7284/7285s. Any depth can be attained by adding additional
IDT7280/7281/7282/7283/7284/7285s. These FIFOs operate in the Depth
Expansionmodewhenthefollowingconditionsaremet:
1. ThefirstFIFOmustbedesignatedbygroundingtheFirstLoad(FL)control
input.
2. All other FIFOs must have FLin the HIGH state.
3. TheExpansionOut(XO)pinofeachdevicemustbetiedtotheExpansion
In (XI) pin of the next device. See Figure 14.
4. ExternallogicisneededtogenerateacompositeFullFlag(FF)andEmpty
Flag (EF). This requires the ORing of all EFs and ORing of all FFs (i.e. all
must be set to generate the correct composite FFor EF). See Figure 14.
5. TheRetransmit(RT)functionandHalf-FullFlag(HF)arenotavailablein
the Depth Expansion Mode.
R
W
HF
tRHF
3208 drw 11
HALF-FULL OR LESS
MORE THAN HALF-FULL
HALF-FULL OR LESS
tWHF
R
W
XO
3208 drw 12
WRITE TO
LAST PHYSICAL
LOCATION
tXOL
tXOH
READ FROM
LAST PHYSICAL
LOCATION
tXOL
tXOH
W
XI
R
3208 drw 13
WRITE TO
FIRST PHYSICAL
LOCATION
READ FROM
FIRST PHYSICAL
LOCATION
tXIS
tXIR
tXI
tXIS
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