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IDT7282 Datasheet(PDF) 7 Page - Integrated Device Technology

Part # IDT7282
Description  CMOS DUAL ASYNCHRONOUS FIFO DUAL 256 x 9, DUAL 512 x 9, DUAL 1024 x 9
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT7282 Datasheet(HTML) 7 Page - Integrated Device Technology

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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
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
application requirements are for 256/512/1,024/2,048/4,096/8,192 words or
less. These FIFOs are in a Single Device Configuration when the Expansion
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
Expansion mode when the following conditions are met:
1. ThefirstFIFOmustbedesignatedbygroundingtheFirstLoad(
FL)control
input.
2. All other FIFOs must have
FLin the HIGH state.
3. The Expansion Out (
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. The Retransmit (
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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