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IDT7281LA30SOGI8 View Datasheet(PDF) - Integrated Device Technology

Part NameIDT7281LA30SOGI8 IDT
Integrated Device Technology IDT
DescriptionCMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9


IDT7281LA30SOGI8 Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY
TEMPERATURE RANGES
W
tRHF
R
tWHF
HF
HALF-FULL OR LESS
MORE THAN HALF-FULL
Figure 9. Half-Full Flag Timing
HALF-FULL OR LESS
2679 drw 11
WRITE TO
LAST PHYSICAL
LOCATION
W
R
tXOL
tXOH
READ FROM
LAST PHYSICAL
LOCATION
tXOL
tXOH
XO
Figure 10. Expansion Out
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tXI
tXIR
XI
tXIS
WRITE TO
W
FIRST PHYSICAL
LOCATION
tXIS
READ FROM
R
FIRST PHYSICAL
LOCATION
Figure 11. Expansion In
2679 drw 13
OPERATING MODES:
Care must be taken to assure that the appropriate flag is monitored by
each system (i.e. FF is monitored on the device where W is used; EF is monitored
on the device where R is used). For additional information, refer to Tech Note
8: Operating FIFOs on Full and Empty Boundary Conditions and Tech Note
6: Designing with FIFOs.
SINGLE DEVICE MODE
A single IDT7200/7201A/7202A may be used when the application
requirements are for 256/512/1,024 words or less. These devices are in a
Single Device Configuration when the Expansion In (XI) control input is
grounded (see Figure 12).
DEPTH EXPANSION
The IDT7200/7201A/7202A can easily be adapted to applications when
the requirements are for greater than 256/512/1,024 words. Figure 14
demonstrates Depth Expansion using three IDT7200/7201A/7202As. Any
depth can be attained by adding additional IDT7200/7201A/7202As. These
FIFOs operate in the Depth Expansion mode when the following conditions
are met:
1. ThefirstdevicemustbedesignatedbygroundingtheFirstLoad(FL)control
input.
2. All other devices must have FL in 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 FF or EF). See Figure
14.
5. The Retransmit (RT) function and Half-Full Flag (HF) are not available in
the Depth Expansion Mode.
For additional information, refer to Tech Note 9: Cascading FIFOs or
FIFO Modules.
9
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DESCRIPTION:
The IDT7200/7201/7202 are dual-port memories that load and empty data on a first-in/first-out basis. The devices use Full and Empty flags to prevent data overflow and underflow and expansion logic to allow for unlimited expansion capability in both word size and depth.
The reads and writes are internally sequential through the use of ring pointers, with no address information required to load and unload data. Data is toggled in and out of the devices through the use of the Write (W) and Read (R) pins.
The devices utilize a 9-bit wide data array to allow for control and parity bits at the user’s option. This feature is especially useful in data communications applications where it is necessary to use a parity bit for transmission/reception error checking. It also features a Retransmit (RT) capability that allows for reset of the read pointer to its initial position when RT is pulsed LOW to allow for retransmission from the beginning of data. A Half-Full Flag is available in the single device mode and width expansion modes.
These FIFOs are fabricated using high-speed CMOS technology. They are designed for those applications requiring asynchronous and simultaneous read/writes in multiprocessing and rate buffer applications. Military grade product is manufactured in compliance with MIL-STD-883, Class B.

FEATURES:
• First-In/First-Out dual-port memory
• 256 x 9 organization (IDT7200)
• 512 x 9 organization (IDT7201)
• 1,024 x 9 organization (IDT7202)
• Low power consumption
   — Active: 440mW (max.)
   —Power-down: 28mW (max.)
• Ultra high speed—12ns access time
• Asynchronous and simultaneous read and write
• Fully expandable by both word depth and/or bit width
• 720x family is pin and functionally compatible from 256 x 9 to 64k x 9
• Status Flags: Empty, Half-Full, Full
• Auto-retransmit capability
• High-performance CEMOS™ technology
• Military product compliant to MIL-STD-883, Class B
• Standard Military Drawing #5962-87531, 5962-89666, 5962-89863 and 5962-89536 are listed on this function
• Dual versions available in the TSSOP package. For more information, see IDT7280/7281/7282 data sheet
   IDT7280 = 2 x IDT7200
   IDT7281 = 2 x IDT7201
   IDT7282 = 2 x IDT7202

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