72V851L20TF IDT, 72V851L20TF Datasheet

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72V851L20TF

Manufacturer Part Number
72V851L20TF
Description
FIFO
Manufacturer
IDT
Datasheet

Specifications of 72V851L20TF

Part # Aliases
IDT72V851L20TF
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
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DESCRIPTION:
dual synchronous (clocked) FIFOs. The device is functionally equivalent to
two IDT72V201/72V211/72V221/72V231/72V241/72V251 FIFOs in a single
package with all associated control, data, and flag lines assigned to separate
pins.
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The TeraSync FIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
©2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
The IDT72V801 is equivalent to two IDT72V201 256 x 9 FIFOs
The IDT72V811 is equivalent to two IDT72V211 512 x 9 FIFOs
The IDT72V821 is equivalent to two IDT72V221 1,024 x 9 FIFOs
The IDT72V831 is equivalent to two IDT72V231 2,048 x 9 FIFOs
The IDT72V841 is equivalent to two IDT72V241 4,096 x 9 FIFOs
The IDT72V851 is equivalent to two IDT72V251 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
5V input tolerant
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 plastic Thin Quad Flat Pack (TQFP/
STQFP)
Industrial temperature range (–40° ° ° ° ° C to +85° ° ° ° ° C) is available
Green parts available, see ordering information
The IDT72V801/72V811/72V821/72V831/72V841/72V851/72V851 are
WRITE CONTROL
WRITE POINTER
WCLKA
RESET LOGIC
LOGIC
WENA1
RSA
WENA2
OEA
OUTPUT REGISTER
1,024 x 9, 2,048 x 9,
4,096 x 9, 8,192 x 9
INPUT REGISTER
256 x 9, 512 x 9,
RAM ARRAY
DA
QA
0
0
- DA
- QA
8
8
3.3 VOLT 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
RENA1
LOGIC
LOGIC
FLAG
RENA2
LDA
EFA
PAEA
PAFA
FFA
1
IDT72V801/72V811/72V821/72V831/72V841/72V851 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.
lends itself to many flexible configurations such as:
technology.
WRITE CONTROL
WCLKB
WRITE POINTER
• 2-level priority data buffering
• Bidirectional operation
• Width expansion
• Depth expansion
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 IDT72V801/72V811/72V821/72V831/72V841/72V851 architecture
This FIFO is fabricated using IDT's high-performance submicron CMOS
LOGIC
WENB1
RSB
WENB2
OEB
OUTPUT REGISTER
1,024 x 9, 2,048 x 9,
INPUT REGISTER
4,096 x 9, 8,192 x 9
256 x 9, 512 x 9,
RAM ARRAY
DB
QB
0
0
- DB
- QB
8
8
OFFSET REGISTER
OCTOBER 2008
READ CONTROL
READ POINTER
RCLKB
LOGIC
LOGIC
RENB1
FLAG
RENB2
IDT72V801
IDT72V811
IDT72V821
IDT72V831
IDT72V841
IDT72V851
LDB
4093 drw 01
DSC-4093/4
EFB
PAEB
PAFB
FFB

Related parts for 72V851L20TF

72V851L20TF Summary of contents

Page 1

... IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The TeraSync FIFO is a trademark of Integrated Device Technology, Inc. COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES ©2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. ...

Page 2

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL PIN CONFIGURATION WENA /LDA 2 WCLKA WENA 1 RSA ...

Page 3

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL PIN DESCRIPTIONS The IDT72V801/72V811/72V821/72V831/72V841/72V851's two FIFOs, referred to as FIFO A and FIFO B, are identical in every respect. The following Symbol Name I Data Inputs I A0 ...

Page 4

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL ABSOLUTE MAXIMUM RATINGS Symbol Rating V Terminal Voltage with TERM Respect to GND T Storage Temperature STG I DC Output Current OUT NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device ...

Page 5

... Programmable Almost-Empty Flag and Programmable Almost-Full Flag NOTES: 1. Industrial temperature range product for the 15ns speed grade is available as a standard device. 2. Pulse widths less than minimum values are not allowed. 3. Values guaranteed by design, not currently tested. AC TEST CONDITIONS In Pulse Levels Input Rise/Fall Times ...

Page 6

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL SIGNAL DESCRIPTIONS 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 ...

Page 7

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL contains four 8-bit offset registers which can be loaded with data on the inputs, or read on the outputs. See Figure 3 for details of the size of the registers and the default values ...

Page 8

... Full Flag (FFA, FFB) — FFA (FFB) will go LOW, inhibiting further write operations, when Array A (B) is full reads are performed after reset, FFA (FFB) will go LOW after 256 writes to the IDT72V801's FIFO A (B), 512 writes to the IDT72V811's FIFO A (B), 1,024 writes to the IDT72V821's FIFO A (B), 2,048 writes to the IDT72V831's FIFO A (B), 4,096 writes to the IDT72V841's FIFO A (B), or 8,192 writes to the IDT72V851's FIFO A (B) ...

Page 9

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL RSA (RSB) RENA1, RENA2 (RENB1, RENB2) WENA1 (WENB1) (1) WENA2/LDA (WENB2/LDB) EFA, PAEA (EFB, PAEB) FFA, PAFA (FFA, PAFA ( NOTES: 1 ...

Page 10

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL 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) edge and a rising RCLKA (RCLKB) edge for EFA (EFB) to change during the current clock cycle. If the time 1 ...

Page 11

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL WRITE WCLKA (WCLKB) t SKEW1 ( FFA (FFB) WENA1 (WENB1) WENA2 (WENB2) (If Applicable) RCLKA (RCLKB) t ENH t ENS RENA1 (RENB2) OEA ...

Page 12

... NOTES PAF offset. 2. (256-m) words for the IDT72V801, (512-m) words the IDT72V811, (1,024-m) words for the IDT72V821, (2,048-m) words for the IDT72V831, (4,096-m) words for the IDT72V841, or (8,192-m) words for the IDT72V851. 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 3 ...

Page 13

... IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFO DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL CLK t CLKH WCLKA (WCLKB) t LDA (LDB) t ENS WENA1 (WENB1 ( PAE OFFSET (LSB) t CLK t CLKH RCLKA (RCLKB) t ENS LDA (LDB) ...

Page 14

... WRITE ENABLE/LOAD FFA FULL FLAG FFB Figure 15. Block diagram of the two FIFOs contained in one IDT72V801/72V811/72V821/72V831/72V841/72V851 TM be grounded (see Figure 14). In this configuration, the Write Enable 2/Load WENA2/LDA (WENB2/LDB) pin is set LOW at Reset so that the pin operates as a control to load and read the programmable flag offsets. ...

Page 15

... DUAL 256 x 9, DUAL 512 x 9, DUAL DUAL DUAL DUAL TWO PRIORITY DATA BUFFER CONFIGURATION The two FIFOs contained in the IDT72V801/72V811/72V821/72V831/ 72V841/72V851 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 ...

Page 16

... WENA2/LDA and WENB2/LDB pins are held HIGH during Reset so that these pins operate as second Write Enables. 2. External logic is used to control the flow of data. Please see the Application Note "DEPTH EXPANSION OF IDT'S SYN- CHRONOUS FIFOs USING THE RING COUNTER APPROACH" for details of this configuration. ...

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