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3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO DUAL 512 x 9, DUAL 1,024 x 9 DUAL 2,048 x 9, DUAL 4,096 X 9 DUAL 8,192 X 9
IDT72V81 IDT72V82 IDT72V83 IDT72V84 IDT72V85
FEATURES:
* * * * * *
DESCRIPTION:
The IDT72V81/72V82/72V83/72V84/72V85 are dual-FIFO memories that load and empty data on a first-in/first-out basis. These devices are functional and compatible to two IDT72V01/72V02/72V03/72V04/72V05 FIFOs in a single package with all associated control, data, and flag lines assigned to separate pins. 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 IDT's high-speed CMOS technology. They are designed for those applications requiring asynchronous and simultaneous read/writes in multiprocessing and rate buffer applications.
* * * * * * * * * *
The IDT72V81 is equivalent to two IDT72V01 - 512 x 9 FIFOs The IDT72V82 is equivalent to two IDT72V02 - 1,024 x 9 FIFOs The IDT72V83 is equivalent to two IDT72V03 - 2,048 x 9 FIFOs The IDT72V84 is equivalent to two IDT72V04 - 4,096 x 9 FIFOs The IDT72V85 is equivalent to two IDT72V05 - 8,192 x 9 FIFOs Low power consumption -- Active: 330 mW (max.) -- Power-down: 18 mW (max.) Ultra high speed--15 ns access time Asynchronous and simultaneous read and write Offers optimal combination of data capacity, small foot print and functional flexibility Ideal for bidirectional, width expansion, depth expansion, busmatching, and data sorting applications Status Flags: Empty, Half-Full, Full Auto-retransmit capability High-performance CEMOSTM technology Space-saving TSSOP package Industrial temperature range (-40C to +85C) is available Green parts available, see ordering information
FUNCTIONAL BLOCK DIAGRAM
DATA INPUTS (DA0-DA8) WA WRITE CONTROL WRITE POINTER THREESTATE BUFFERS
RSA
WB WRITE CONTROL WRITE POINTER
DATA INPUTS (DB0-DB8)
RSB
RAM ARRAY A 512 x 9 1,024 x 9 2,048 x 9 4,096 x 9 8,192 x 9
READ POINTER
RAM ARRAY A 512 x 9 1,024 x 9 2,048 x 9 4,096 x 9 8,192 x 9
READ POINTER
THREESTATE BUFFERS
RA
READ CONTROL FLAG LOGIC EXPANSION LOGIC
RESET LOGIC
READ CONTROL FLAG LOGIC EXPANSION LOGIC
RESET LOGIC
XIA
XOA/HFA
FFA
EFA
DATA OUTPUTS (QA0-QA8)
FLA/RTA
RB
XIB
XOB/HFB
FFB
EFB
DATA OUTPUTS (QB0-QB8)
FLB/RTB
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IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The AsyncFIFOTM is a trademark of Integrated Device Technology, Inc.
COMMERICAL TEMPERATURE RANGE
FEBRUARY 2009
DSC-3966/3
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(c) 2009 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
FFA QA0 QA1 QA2 QA3 QA8 GND RA QA4 QA5 QA6 QA7 XOA/HFA EFA FFB QB0 QB1 QB2 QB3 QB8 GND RB QB4 QB5 QB6 QB7 XOB/HFB EFB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 XIA DA0 DA1 DA2 DA3 DA8 WA VCC DA4 DA5 DA6 DA7 FLA/RTA RSA XIB DB0 DB1 DB2 DB3 DB8 WB VCC DB4 DB5 DB6 DB7 FLB/RTB RSB
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ABSOLUTE MAXIMUM RATINGS
Symbol VTERM TSTG IOUT Rating Terminal Voltage with Respect to GND Storage Temperature DC Output Current Commercial -0.5 to +7.0 -55 to +125 -50 to +50 Unit V C mA
NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
Symbol VCC GND VIH(1) VIL(2) TA Parameter Supply Voltage Supply Voltage Input High Voltage Input Low Voltage Operating Temperature Commercial Min. 3.0 0 2.0 -- 0 Typ. 3.3 0 -- -- -- Max. 3.6 0 VCC+0.5 0.8 70 Unit V V V V C
NOTES: 1. For RT/RS/XI input, VIH = 2.6V (commercial). 2. 1.5V undershoots are allowed for 10ns once per cycle.
TSSOP (SO56-2, order code: PA) TOP VIEW
CAPACITANCE (TA = +25C, f = 1.0 MHz)
Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Condition VIN = 0V VOUT = 0V Max. 8 8 Unit pF pF
DC ELECTRICAL CHARACTERISTICS(1)
(Commercial: VCC = 3.3V0.3V, TA = 0C to +70C)
IDT72V81 IDT72V82 IDT72V83 IDT72V84 IDT72V85 Commercial tA = 15, 20 ns Symbol ILI(1) ILO(2) VOH VOL ICC1(3,4) ICC2(3,5) Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic "1" Voltage IOH = -2mA Output Logic "0" Voltage IOL = 8mA Active Power Supply Current (both FIFOs) Standby Current (R=W=RS=FL/RT=VIH) Min. -1 -10 2.4 -- -- -- Max. 1 10 -- 0.4 100 5 Unit A A V V mA mA
NOTE: 1. Characterized values, not currently tested.
AC TEST CONDITIONS
Input Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load GND to 3.0V 5ns 1.5V 1.5V See Figure 1
3.3V
330 TO OUTPUT PIN 510
30pF*
NOTES: 1. Measurements with 0.4 VIN VCC. 2. R VIH, 0.4 VOUT VCC. 3. Tested with outputs open (IOUT = 0). 4. Tested at f = 20 MHz. 5. All Inputs = VCC - 0.2V or GND + 0.2V.
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or equivalent circuit Figure 1. Output Load *Includes scope and jib capacitances.
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS(1)
(Commercial: VCC = 3.3V0.3V, TA = 0C to +70C)
Commercial IDT72V81L15 IDT72V82L15 IDT72V83L15 IDT72V84L15 IDT72V85L15 Symbol tS tRC tA tRR tRPW tRLZ tWLZ tDV tRHZ tWC tWPW tWR tDS tDH tRSC tRS tRSS tRSR tRTC tRT tRTS tRTR tEFL tHFH,FFH tRTF tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tXOL tXOH tXI tXIR tXIS Parameter Shift Frequency Read Cycle Time Access Time Read Recovery Time Read Pulse Width(2) Read Pulse Low to Data Bus at Low Z(3) Write Pulse High to Data Bus at Low Z(3, 4) Data Valid from Read Pulse High Read Pulse High to Data Bus at High Z(3) Write Cycle Time Write Pulse Width(2) Write Recovery Time Data Set-up Time Data Hold Time Reset Cycle Time Reset Pulse Width(2) Reset Set-up Time(3) Reset Recovery Time Retransmit Cycle Time Retransmit Pulse Width(2) Retransmit Set-up Time(3) Retransmit Recovery Time Reset to Empty Flag Low Reset to Half-Full and Full Flag High Retransmit Low to Flags Valid Read Low to Empty Flag Low Read High to Full Flag High Read Pulse Width after EF High Write High to Empty Flag High Write Low to Full Flag Low Write Low to Half-Full Flag Low Read High to Half-Full Flag High Write Pulse Width after FF High Read/Write to XO Low Read/Write to XO High XI Pulse Width(2) XI Recovery Time XI Set-up Time Min. -- 25 -- 10 15 3 5 5 -- 25 15 10 11 0 25 15 15 10 25 15 15 10 -- -- -- -- -- 15 -- -- -- -- 15 -- -- 15 10 10 Max. 40 -- 15 -- -- -- -- -- 15 -- -- -- -- -- -- -- -- -- -- -- -- -- 25 25 25 15 15 -- 15 15 25 25 -- 15 15 -- -- -- IDT72V81L20 IDT72V82L20 IDT72V83L20 IDT72V84L20 IDT72V85L20 Min. -- 30 -- 10 20 3 5 5 -- 30 20 10 12 0 30 20 20 10 30 20 20 10 -- -- -- -- -- 20 -- -- -- -- 20 -- -- 20 10 10 Max. 33.3 -- 20 -- -- -- -- -- 15 -- -- -- -- -- -- -- -- -- -- -- -- -- 30 30 30 20 20 -- 20 20 30 30 -- 20 20 -- -- -- Unit MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
NOTES: 1. Timings referenced as in AC Test Conditions. 2. Pulse widths less than minimum value are not allowed. 3. Values guaranteed by design, not currently tested. 4. Only applies to read data flow-through mode.
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
SIGNAL DESCRIPTIONS INPUTS:
DATA IN (D0 - D8) Data inputs for 9-bit wide data.
CONTROLS:
RESET ( RS ) Reset is accomplished whenever the Reset (RS) input is taken to a low state. During reset, both internal read and write pointers are set to the first location. A reset is required after power up before a write operation can take place. Both the Read Enable ( R ) and Write Enable ( W ) inputs must be in the high state during the window shown in Figure 2, (i.e., tRSS before the rising edge of RS ) and should not change until tRSR after the rising edge of RS. Half-Full Flag ( HF ) will be reset to high after Reset ( RS ). WRITE ENABLE ( W ) A write cycle is initiated on the falling edge of this input if the Full Flag (FF) is not set. Data set-up and hold times must be adhered to with respect to the rising edge of the Write Enable (W). Data is stored in the RAM array sequentially and independently of any on-going read operation. After half of the memory is filled and at the falling edge of the next write operation, the Half-Full Flag (HF) will be set to low and will remain set until the difference between the write pointer and read pointer is less than or equal to one half of the total memory of the device. The Half-Full Flag (HF) is then reset by the rising edge of the read operation. To prevent data overflow, the Full Flag (FF) will go low, inhibiting further write operations. Upon the completion of a valid read operation, the Full Flag (FF) will go high after tRFF, allowing a valid write to begin. When the FIFO is full, the internal write pointer is blocked from W, so external changes in W will not affect the FIFO when it is full. READ ENABLE ( R ) A read cycle is initiated on the falling edge of the Read Enable (R) provided the Empty Flag (EF) is not set. The data is accessed on a First-In/First-Out basis, independent of any ongoing write operations. After Read Enable (R) goes high, the Data Outputs (Q0 - Q8) will return to a high impedance condition until the next Read operation. When all data has been read from the FIFO, the Empty Flag (EF) will go low, allowing the "final" read cycle but inhibiting further read operations with the data outputs remaining in a high impedance state. Once a valid write operation has been accomplished, the Empty Flag (EF) will go high after tWEF and a valid Read can then begin. When the FIFO is empty, the internal read pointer is blocked from R so external changes in R will not affect the FIFO when it is empty. FIRST LOAD/RETRANSMIT ( FL/RT ) This is a dual-purpose input. In the Depth Expansion Mode, this pin is grounded to indicate that it is the first loaded (see Operating Modes). In the
Single Device Mode, this pin acts as the retransmit input. The Single Device Mode is initiated by grounding the Expansion In (XI). The IDT72V81/72V82/72V83/72V84/72V85 can be made to retransmit data when the Retransmit Enable control (RT) input is pulsed low. A retransmit operation will set the internal read pointer to the first location and will not affect the write pointer. Read Enable (R) and Write Enable (W) must be in the high state during retransmit for the IDT72V81/72V82/72V83/72V84/72V85 respectively. This feature is useful when less than 512/1,024/2,048/4,096/8,192 writes are performed between resets. The retransmit feature is not compatible with the Depth Expansion Mode and will affect the Half-Full Flag (HF), depending on the relative locations of the read and write pointers. EXPANSION IN ( XI ) This input is a dual-purpose pin. Expansion In (XI) is grounded to indicate an operation in the single device mode. Expansion In (XI) is connected to Expansion Out (XO) of the previous device in the Depth Expansion or Daisy Chain Mode.
FULL FLAG ( FF ) The Full Flag (FF) will go low, inhibiting further write operation, when the write pointer is one location less than the read pointer, indicating that the device is full. If the read pointer is not moved after Reset (RS), the Full-Flag (FF) will go low after 512 writes for the IDT72V81, 1,024 writes for the IDT72V82, 2,048 writes for the IDT72V83, 4,096 writes for the IDT72V84 and 8,192 writes for the IDT72V85. EMPTY FLAG ( EF ) The Empty Flag (EF) will go low, inhibiting further read operations, when the read pointer is equal to the write pointer, indicating that the device is empty. EXPANSION OUT/HALF-FULL FLAG ( XO/HF ) This is a dual-purpose output. In the single device mode, when Expansion In (XI) is grounded, this output acts as an indication of a half-full memory. After half of the memory is filled and at the falling edge of the next write operation, the Half-Full Flag (HF) will be set low and will remain set until the difference between the write pointer and read pointer is less than or equal to one half of the total memory of the device. The Half-Full Flag (HF) is then reset by using rising edge of the read operation. In the Depth Expansion Mode, Expansion In (XI) is connected to Expansion Out (XO) of the previous device in the Daisy Chain by providing a pulse to the next device when the previous device reaches the last location of memory. DATA OUTPUTS ( Q0 - Q8 ) Data outputs for 9-bit wide data. This data is in a high impedance condition whenever Read (R) is in a high state.
OUTPUTS:
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
tRSC RS W tRSS R tEFL EF tHFH, tFFH HF, FF
NOTES: 1. EF, FF, HF may change status during Reset, but flags will be valid at tRSC. 2. W and R = VIH around the rising edge of RS. Figure 2. Reset
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tRS tRSS tRSR
tRC tA R tRLZ Q0-Q8 tWPW W tDS D0-D8
tRPW tRR tDV tA
tRHZ DATA OUT VALID
DATA OUT VALID tWC tWR
tDH DATA IN VALID
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DATA IN VALID
Figure 3. Asynchronous Write and Read Operation
LAST WRITE R
IGNORED WRITE
FIRST READ
ADDITIONAL READS
FIRST WRITE
W tWFF FF
Figure 4. Full Flag From Last Write to First Read
tRFF
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
LAST READ W
IGNORED READ
FIRST WRITE
ADDITIONAL WRITES
FIRST READ
R tREF EF tA DATA OUT VALID
Figure 5. Empty Flag From Last Read to First Write
tWEF
VALID
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tRTC tRT RT tRTS W,R tRTF HF, EF, FF
Figure 6. Retransmit
tRTR
FLAG VALID
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W
tWEF
EF tRPE R
Figure 7. Minimum Timing for an Empty Flag Coincident Read Pulse
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R
tRFF
FF tWPF W
Figure 8. Minimum Timing for an Full Flag Coincident Write Pulse
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
W
tRHF
R tWHF HF
HALF-FULL OR LESS MORE THAN HALF-FULL HALF-FULL OR LESS
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Figure 9. Half-Full Flag Timing
WRITE TO LAST PHYSICAL LOCATION
W R tXOL XO tXOH
READ FROM LAST PHYSICAL LOCATION
tXOL
tXOH
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Figure 10. Expansion Out
tXI XI tXIS W
WRITE TO FIRST PHYSICAL LOCATION
tXIR
tXIS R
Figure 11. Expansion In
READ FROM FIRST PHYSICAL LOCATION
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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). Single Device Mode A single IDT72V81/72V82/72V83/72V84/72V85 may be used when the application requirements are for 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 requirements are for greater than 512/1,024/2,048/4,096/8,192 words. Figure 14 demon7
strates a four-FIFO Depth Expansion using two IDT72V81/72V82/72V83/ 72V84/72V85s. Any depth can be attained by adding additional IDT72V81/ 72V82/72V83/72V84/72V85s. These FIFOs operate in the Depth Expansion mode when the following conditions are met: 1. The first FIFO must be designated by grounding the First Load (FL) control input. 2. All other FIFOs must have FL in the high state. 3. The Expansion Out (XO) pin of each device must be tied to the Expansion In (XI) pin of the next device. See Figure 14. 4. External logic is needed to generate a composite Full Flag (FF) and Empty 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.
FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
USAGE MODES:
Width Expansion Word width may be increased simply by connecting the corresponding input control signals of multiple FIFOs. Status flags (EF, FF and HF) can be detected from any one FIFO. Figure 13 demonstrates an 18-bit word width by using the two FIFOs contained in the IDT72V81/72V82/72V83/72V84/72V85s. Any word width can be attained by adding FIFOs (Figure 13). Bidirectional Operation Applications which require data buffering between two systems (each system capable of Read and Write operations) can be achieved by pairing IDT72V81/72V82/72V83/72V84/72V85s as shown in Figure 16. Both Depth Expansion and Width Expansion may be used in this mode. Data Flow-Through Two types of flow-through modes are permitted, a read flow-through and write flow-through mode. For the read flow-through mode (Figure 17), the
FIFO permits a reading of a single word after writing one word of data into an empty FIFO. The data is enabled on the bus in (tWEF + tA) ns after the rising edge of W, called the first write edge, and it remains on the bus until the R line is raised from low-to-high, after which the bus would go into a three-state mode after tRHZ ns. The EF line would have a pulse showing temporary deassertion and then would be asserted. In the write flow-through mode (Figure 18), the FIFO permits the writing of a single word of data immediately after reading one word of data from a full FIFO. The R line causes the FF to be deasserted but the W line being low causes it to be asserted again in anticipation of a new data word. On the rising edge of W, the new word is loaded in the FIFO. The W line must be toggled when FF is not asserted to write new data in the FIFO and to increment the write pointer. Compound Expansion The two expansion techniques described above can be applied together in a straightforward manner to achieve large FIFO arrays (see Figure 15).
(HALF-FULL FLAG) WRITE (W)
(HF) READ (R)
9
DATA IN (D) FULL FLAG (FF) RESET (RS)
FIFO A or B IDT 72V81 72V82 72V83 72V84 72V85
9
DATA OUT (Q) EMPTY FLAG (EF) RETRANSMIT (RT)
EXPANSION IN (XI)
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Figure 12. Block Diagram of One 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 FIFO Used in Single Device Mode
9 HFA 18 DATA
IN
HFB
9 FIFO A FIFO B READ (R) EMPTY FLAG (EFB)
(D)
WRITE (W) FULL FLAG (FFA) RESET (RS) 9
72V81/72V82/72V83
RETRANSMIT (RT)
XIA
9 72V84/72V85
XIB
18 DATA
OUT (Q)
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Figure 13. Block Diagram of One 512 x 18, 1,024 x 18, 2,048 x 18, 4,096 x 18 and 8,192 x 18 FIFO Memory Used in Width Expansion Mode
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
TABLE I--RESET AND RETRANSMIT
Single Device Configuration/Width Expansion Mode
Mode Reset Retransmit Read/Write
NOTE: 1. Pointer will increment if flag is High.
RS 0 1 1
Inputs RT X 0 1
XI 0 0 0
Read Pointer Location Zero Location Zero Increment(1)
Internal Status Write Pointer Location Zero Unchanged Increment(1)
EF 0 X X
Outputs FF 1 X X
HF 1 X X
TABLE II--RESET AND FIRST LOAD TRUTH TABLE
Depth Expansion/Compound Expansion Mode
Mode Reset First Device Reset All Other Devices Read/Write RS 0 0 1 Inputs FL 0 1 X XI (1) (1) (1) Internal Status Read Pointer Write Pointer Location Zero Location Zero Location Zero Location Zero X X Outputs EF 0 0 X FF 1 1 X
XI = Expan-
NOTE: 1. XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output, sion Input, HF = Half-Full Flag Output
XOA EFA
FFA
FIFO A
FLA XIA
72V81/72V82 72V83/72V84 72V85 W
FFB
XOB EFB
R 9 Q V CC
D
9
9
FIFO B
FLB XIB XOA
FULL 9
FFA
EFA
EMPTY
FIFO A
FLA
72V81/72V82 72V83/72V84 72V85
FFB
XIA
XOB EFB
9 RSA
FIFO B
FLB XIB
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Figure 14. Block Diagram of 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9 and 32,768 x 9 FIFO Memory (Depth Expansion)
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
Q0-Q8 Q0-Q8
IDT 72V81/72V82/72V83 72V84/72V85
COMMERCIAL TEMPERATURE RANGE
Q(N-8)-QN Q(N-8)-QN
IDT 72V81/72V82/72V83 72V84/72V85
Q9-Q17 Q9-Q17
IDT 72V81/72V82/72V83 72V84/72V85
R, W, RS
DEPTH EXPANSION BLOCK
DEPTH EXPANSION BLOCK
DEPTH EXPANSION BLOCK
D0-D8 D0-DN
NOTES: 1. For depth expansion block see section on Depth Expansion and Figure 14. 2. For Flag detection see section on Width Expansion and Figure 13.
D9-D17 D9-DN D18-DN D(N-8)-DN
D(N-8)-DN
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Figure 15. Compound FIFO Expansion
WA FFA DA 0-8
IDT 72V81 72V82 72V83 72V84 72V85 FIFO A IDT 7201A
RA EFA HFA QA 0-8
SIDE 1
SIDE 2
QB 0-8 RB HFB EFB
FIFO B
DA 0-8 WB FFB
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Figure 16. Bidirectional FIFO Mode
DATA IN W tRPE R EF tWLZ DATA OUT
Figure 17. Read Data Flow-Through Mode
tWEF
tA
tREF DATA
OUT
VALID
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FEBRUARY 5, 2009
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
COMMERCIAL TEMPERATURE RANGE
R W FF tRFF tWFF DATA IN tA DATA OUT DATA
OUT
tWPF
tDH
IN
DATA
VALID
tDS VALID
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Figure 18. Write Data Flow-Through Mode
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FEBRUARY 5, 2009
ORDERING INFORMATION
XXXX Device Type X Power XXX Speed X Package X X Process/ Temperature Range Blank I(1) G(2) PA 15 20 L 72V81 72V82 72V83 72V84 72V85
NOTES: 1. Industrial temperature range is available by special order. 2. Green parts are available. For specific speeds contact your local sales office.
Commercial (0C to +70C) Industrial (-40C to +85C) Green Thin Shrink SOIC (TSSOP, SO56-2) Commercial Access Time (tA) Speed in Nanoseconds
Low Power 512 x 9 3.3V Dual FIFO 1,024 x 9 3.3V Dual FIFO 2,048 x 9 3.3V Dual FIFO 4,096 x 9 3.3V Dual FIFO 8,192 x 9 3.3V Dual FIFO
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DATASHEET DOCUMENT HISTORY
07/17/2006 02/05/2009 pgs. 1 and 12. pg. 12. CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com
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for Tech Support: 408-360-1753 email: FIFOhelp@idt.com

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