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72V81L15PAGI8 Datasheet(PDF) 7 Page - Integrated Device Technology

Part # 72V81L15PAGI8
Description  3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

72V81L15PAGI8 Datasheet(HTML) 7 Page - Integrated Device Technology

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IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO
512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL ANDINDUSTRIAL
TEMPERATURERANGES
Figure 9. Half-Full Flag Timing
Figure 10. Expansion Out
Figure 11. Expansion In
OPERATINGMODES:
Caremustbetakentoassurethattheappropriateflagismonitoredbyeach
system(i.e.FFismonitoredonthedevicewhere Wisused;EFismonitoredon
the device where R is used).
Single Device Mode
A single IDT72V81/72V82/72V83/72V84/72V85 may be used when the
applicationrequirementsarefor512/1,024/2,048/4,096/8,192wordsorless.
TheseFIFOsareinaSingleDeviceConfigurationwhentheExpansionIn(XI)
control input is grounded (see Figure 12).
Depth Expansion
Thesedevicescaneasilybeadaptedtoapplicationswhentherequirements
are for greater than 512/1,024/2,048/4,096/8,192 words. Figure 14 demon-
strates a four-FIFO Depth Expansion using two IDT72V81/72V82/72V83/
72V84/72V85s. Any depth can be attained by adding additional IDT72V81/
72V82/72V83/72V84/72V85s.TheseFIFOsoperateintheDepthExpansion
mode when the following conditions are met:
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.
W
XI
R
WRITE TO
FIRST PHYSICAL
LOCATION
READ FROM
FIRST PHYSICAL
LOCATION
tXIS
tXIR
tXI
tXIS
3966 drw 13
R
W
XO
3966 drw 12
WRITE TO
LAST PHYSICAL
LOCATION
tXOL
tXOH
READ FROM
LAST PHYSICAL
LOCATION
tXOL
tXOH
R
W
HF
tRHF
3966 drw 11
HALF-FULL OR LESS
MORE THAN HALF-FULL
HALF-FULL OR LESS
tWHF


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