IDT72841 Integrated Device Technology, Inc., IDT72841 Datasheet

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IDT72841

Manufacturer Part Number
IDT72841
Description
DUAL CMOS SyncFIFO? IDT72841DUAL CMOS SyncFIFO?
Manufacturer
Integrated Device Technology, Inc.
Datasheet

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(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.
SyncFIFO is a trademark and the IDT logo is a registered trademark of Integrated Device Technology, Inc.
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 (excluding the IDT72851)
15 ns read/write cycle time for the IDT72851
Separate control lines and data lines for each FIFO
Separate Empty, Full, Programmable Almost-Empty and Almost-
Full 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)
WRITE CONTROL
2001
WRITE POINTER
The IDT72801/72811/72821/72831/72841/72851 are dual synchronous
WCLKA
Industrial temperature range (–40 C to +85 C) is available
RESET LOGIC
LOGIC
WENA1
RSA
Integrated Device Technology, Inc.
WENA2
OEA
OUTPUT REGISTER
INPUT REGISTER
1024 x 9, 2048 x 9,
4096 x 9, 8192 x 9
256 x 9, 512 x 9,
RAM ARRAY
QA0 - QA8
DA0 - DA8
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
OFFSET REGISTER
READ CONTROL
READ POINTER
RCLKA
LOGIC
LOGIC
RENA1
FLAG
RENA2
LDA
EFA
PAEA
PAFA
FFA
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.
(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.
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.
to many flexible configurations such as:
CMOS technology.
WRITE CONTROL
WRITE POINTER
• 2-level priority data buffering
• Bidirectional operation
• Width expansion
• Depth expansion
WCLKB
RESET LOGIC
Each of the two FIFOs (designated FIFO A and FIFO B) contained in the
The output port of each FIFO bank is controlled by its associated clock pin
Each of the two FIFOs has two fixed flags, Empty (EFA, EFB) and Full (FFA,
The IDT72801/72811/72821/72831/72841/72851 architecture lends itself
These FIFOs is fabricated using IDT's high-performance submicron
WENB1
LOGIC
RSB
WENB2
OEB
OUTPUT REGISTER
INPUT REGISTER
1024 x 9, 2048 x 9,
4096 x 9, 8192 x 9
256 x 9, 512 x 9,
RAM ARRAY
DB0 - DB8
QB0 - QB8
OFFSET REGISTER
READ POINTER
READ CONTROL
RCLKB
LOGIC
LOGIC
RENB1
FLAG
RENB2
LDB
IDT72801
IDT72811
IDT72821
IDT72831
IDT72841
IDT72851
DSC-3034/1
3034 drw 01
PAFB
EFB
PAEB
FFB

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IDT72841 Summary of contents

Page 1

... 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, ...

Page 2

IDT72801/728211/72821/72831/72841/72851 WENA2/LDA WCLKA WENA1 RSA Commercial And Industrial Temperature Range ...

Page 3

IDT72801/728211/72821/72831/72841/72851 The IDT72801/72811/72821/72831/72841/72851s two FIFOs, referred to as FIFO A and FIFO B, are identical in every respect. The following Symbol Name I/O DA0-DA8 A Data Inputs I DB0-DB8 B Data Inputs I RSA RSB , Reset I WCLKA Write ...

Page 4

... Commercial And Industrial Temperature Range Symbol Com'l & Ind'l Unit V CC –0.5 to +7.0 V GND –55 to +125 C – ± 10 IDT72801 IDT72811 IDT72821 IDT72831 IDT72841 Commercial and Industrial t = 10, 15 CLK Min. Typ. –1 –10 = – — — — Max. Unit = OUT 4 Parameter Min. ...

Page 5

... GND to 3.0V 3ns 1.5V 1.5V See Figure 1 5 Com'l & (1) Ind'l IDT72801L25 IDT72811L25 IDT72821L25 IDT72831L25 IDT72841L25 IDT72851L25 Max. Min Max. Unit 66.7 — 40 MHz — 25 — ns — 10 — ns — 10 — ns — ...

Page 6

IDT72801/728211/72821/72831/72841/72851 FIFO A and FIFO B are identical in every respect. The following description explains the interaction of input and output signals for FIFO A. The correspond- ing signal names for FIFO B are provided in parentheses. — Data In ...

Page 7

... LOW after 256 writes to the IDT72801's FIFO A (B); 512 writes to the IDT72811's FIFO A (B); 1,024 writes to the IDT72821's FIFO A (B); 2,048 writes to the IDT72831's FIFO A (B); 4,096 writes to the IDT72841's FIFO A (B); or 8,192 writes to the IDT72851's FIFO A (B). FFA (FFB) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock WCLKA (WCLKB). Empty Flag (EFA, EFB) — ...

Page 8

... IDT72801's FIFO A (B); (512-m) writes to the IDT72811's FIFO A (B); (1,024-m) writes to the IDT72821's FIFO A (B); (2,048-m) writes to the IDT72831's FIFO A (B); (4,096-m) writes to the IDT72841's FIFO A (B); or (8,192-m) writes to the IDT72851's FIFO A (B). FFA (FFB) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock WCLKA (WCLKB). The offset “ ...

Page 9

IDT72801/728211/72821/72831/72841/72851 RSA (RSB) RENA1, RENA2 (RENB1, RENB2) WENA1 (WENB1) (1) WENA2/LDA (WENB2/LDB) EFA, PAEA (EFB, PAEB) FFA, PAFA (FFB, PAFB ( NOTES: 1. Holding WENA2/LDA (WENB2/LDB) HIGH during reset will ...

Page 10

IDT72801/728211/72821/72831/72841/72851 RCLKA (RCLKB) t ENS RENA1, RENA2 (RENB1, RENB2) EFA (EFB ( OEA (OEB) WCLKA (WCLKB) WENA1 (WENB1) WENA2 (WENB2) NOTE: is the minimum time between a rising WCLKA (WCLKB) ...

Page 11

IDT72801/728211/72821/72831/72841/72851 NO WRITE WCLKA (WCLKB) t SKEW1 ( FFA (FFB) WENA1 (WENB1) WENA2 (WENB2) (If Applicable) RCLKA (RCLKB) t ENH t ENS RENA1 (RENB2) OEA LOW (OEB ...

Page 12

... NOTES PAF offset. 2. (256-m) words for the IDT72801; (512-m) words the IDT72811; (1,024-m) words for the IDT72821; (2,048-m) words for the IDT72831; (4,096-m) words for the IDT72841; or (8,192-m) words for the IDT72851. is the minimum time between a rising RCLKA (RCLKB) edge and a rising WCLKA (WCLKB) edge for PAFA (PAFB) to change during that clock cycle. If the time between the 3 ...

Page 13

IDT72801/728211/72821/72831/72841/72851 t CLK WCLKA (WCLKB) LDA (LDB) WENA1 (WENB1 ( PAE OFFSET (LSB) t CLK t CLKH RCLKA (RCLKB) t LDA (LDB) t ENS RENA1, RENA2 (RENB1, RENB2 ...

Page 14

IDT72801/728211/72821/72831/72841/72851 SINGLE DEVICE CONFIGURATION — When FIFO A ( Single Device Configuration, the Read Enable 2 RENA2 (RENB2) control input WENA1 (WENB1) WENA2/LDA (WENB2/LDB Figure 14. Block Diagram of One of the IDT72801/72811/72821/72831/72841/72851's two FIFOs ...

Page 15

IDT72801/728211/72821/72831/72841/72851 The two FIFOs contained in the IDT72801/72811/72821/72831/72841/ 72851 can be used to prioritize two different types of data shared on a system bus. When writing from the bus to the FIFO, control logic sorts the intermixed Processor Clock Address ...

Page 16

... Stender Way Santa Clara, CA 95054 The SyncFIFO is a trademark and the IDT logo is a registered trademark of Integrated Device Technology, Inc. access from one device to the next in a sequential manner. These FIFOs operate in the Depth Expansion configuration when the following conditions are met: 1 ...

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