IDT72801
IDT72811
IDT72821
IDT72831
IDT72841
IDT72851
DUAL CMOS SyncFIFO™
DUAL 256 x 9, DUAL 512 x 9,
DUAL 1,024 x 9, DUAL 2,048 x 9,
DUAL 4,096 x 9, DUAL 8,192 x 9
FEATURES:
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Each of the two FIFOs (designated FIFO A and FIFO B) contained in the
IDT72801/72811/72821/72831/72841/72851 has a 9-bit input data port (DA0
- DA8, DB0 - DB8) and a 9-bit output data port (QA0 - QA8, QB0 - QB8). Each
input port is controlled by a free-running clock (WCLKA, WCLKB), and two Write
Enable pins (WENA1, WENA2, WENB1, WENB2). Data is written into each of
the two arrays on every rising clock edge of the Write Clock (WCLKA, WCLKB)
when the appropriate write enable pins are asserted.
The output port of each FIFO bank is controlled by its associated clock pin
(RCLKA, RCLKB) and two Read Enable pins (RENA1, RENA2, RENB1,
RENB2). The Read Clock can be tied to the Write Clock for single clock operation
or the two clocks can run asynchronous of one another for dual clock operation.
An Output Enable pin (OEA, OEB) is provided on the read port of each FIFO
for three-state output control.
Each of the two FIFOs has two fixed flags, Empty (EFA, EFB) and Full (FFA,
FFB). Two programmable flags, Almost-Empty (PAEA, PAEB) and Almost-Full
(PAFA, PAFB), are provided for each FIFO bank to improve memory utilization.
If not programmed, the programmable flags default to empty+7 for PAEA and
PAEB, and full-7 for PAFA and PAFB.
The IDT72801/72811/72821/72831/72841/72851 architecture lends itself
to many flexible configurations such as:
• 2-level priority data buffering
• Bidirectional operation
• Width expansion
• Depth expansion
These FIFOs is fabricated using IDT's high-performance submicron
CMOS technology.
The IDT72801 is equivalent to two IDT72201 256 x 9 FIFOs
The IDT72811 is equivalent to two IDT72211 512 x 9 FIFOs
The IDT72821 is equivalent to two IDT72221 1,024 x 9 FIFOs
The IDT72831 is equivalent to two IDT72231 2,048 x 9 FIFOs
The IDT72841 is equivalent to two IDT72241 4,096 x 9 FIFOs
The IDT72851 is equivalent to two IDT72251 8,192 x 9 FIFOs
Offers optimal combination of large capacity, high speed,
design flexibility and small footprint
Ideal for prioritization, bidirectional, and width expansion
applications
10 ns read/write cycle time for the IDT72801/72811/72821/72831/
72841/72851
Separate control lines and data lines for each FIFO
Separate Empty, Full, Programmable Almost-Empty and AlmostFull flags for each FIFO
Enable puts output data lines in high-impedance state
Space-saving 64-pin Thin Quad Flat Pack (TQFP) and Slim Thin
Quad Flatpack (STQFP)
Industrial temperature range (–40°C to +85°C) is available
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Green parts available, see ordering information
DESCRIPTION:
The IDT72801/72811/72821/72831/72841/72851 are dual synchronous
(clocked) FIFOs. The device is functionally equivalent to two IDT72201/72211/
72221/72231/72241/72251 FIFOs in a single package with all associated
control, data, and flag lines assigned to separate pins.
FUNCTIONAL BLOCK DIAGRAM
WCLKA
WENA1
WENA2
EFA
PAEA
PAFA
LDA
FFA
DA0 - DA8
INPUT REGISTER
WCLKB
WENB1
OFFSET REGISTER
INPUT REGISTER
FLAG
LOGIC
WRITE CONTROL
LOGIC
RAM ARRAY
256 x 9, 512 x 9,
1024 x 9, 2048 x 9,
4096 x 9, 8192 x 9
WRITE POINTER
DB0 - DB8
WRITE CONTROL
LOGIC
READ POINTER
WRITE POINTER
OFFSET REGISTER
EFB
PAEB
PAFB
FFB
FLAG
LOGIC
RAM ARRAY
256 x 9, 512 x 9,
1024 x 9, 2048 x 9,
4096 x 9, 8192 x 9
READ CONTROL
LOGIC
READ POINTER
READ CONTROL
LOGIC
OUTPUT REGISTER
OUTPUT REGISTER
RESET LOGIC
RSA
LDB
WENB2
RESET LOGIC
OEA
QA0 - QA8
RSB
RCLKA
RENA1
RENA2
OEB
QB0 - QB8
RCLKB
RENB1
RENB2
3034 drw 01
IDT, IDT logo and the SyncFIFO logo are trademarks of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
FEBRUARY 2006
1
©2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-3034/3
