CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 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 • IDT7200L IDT7201LA IDT7202LA Industrial temperature range (–40oC to +85oC) is available (plastic packages only) Green parts available, see ordering information 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. FUNCTIONAL BLOCK DIAGRAM DATA INPUTS (D0-D8) W WRITE CONTROL WRITE POINTER R READ POINTER THREESTATE BUFFERS DATA OUTPUTS (Q0-Q8) READ CONTROL FLAG LOGIC XI RAM ARRAY 256 x 9 512 x 9 1,024 x 9 EXPANSION LOGIC EF FF XO/HF IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES 1 ©2012 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. RS RESET LOGIC FL/RT 2679 drw 01 JUNE 2012 DSC-2679/13 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 W D5 VCC D4 D3 INDEX D8 PIN CONFIGURATIONS W NC COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES 28 27 VCC D8 1 2 D3 3 26 D5 D2 5 29 D6 D2 4 25 D6 D1 D1 5 24 D7 28 27 D7 NC D0 XI 6 23 22 FF 8 9 26 7 FL/RT RS D0 XI 6 7 FL/RT RS FF 21 20 EF Q0 10 Q0 8 9 XO/HF Q1 11 24 23 Q1 10 19 Q7 NC Q2 13 D4 12 17 Q5 Q8 13 16 GND 14 15 Q4 R Q6 Q5 Q3 XO/HF Q7 14 15 16 17 18 19 20 Q4 Q6 NC R 18 EF 22 21 12 Q8 GND 11 25 Q3 Q2 4 3 2 1 32 31 30 2679 drw 02b 2679 drw 02a Package Type PLASTIC DIP(1) PLASTIC THIN DIP CERDIP(1) THIN CERDIP SOIC Reference Identifier Order Code P28-1 P28-2 D28-1 D28-3 SO28-3 P TP D TD SO Package Type LCC(1) PLCC Reference Identifier L32- 1 J32-1 Order Code L J TOP VIEW TOP VIEW NOTE: 1. The 600-mil-wide DIP (P28-1 and D28-1) and LCC are not available for the IDT7200. RECOMMENDED DC OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS Symbol VTERM TSTG IOUT Rating Terminal Voltage with Respect to GND Storage Temperature DC Output Current Symbol VCC Com’l & Ind'l –0.5 to +7.0 Mil. –0.5 to +7.0 Unit V –55 to +125 –65 to +155 °C –50 to +50 –50 to +50 mA GND VIH(1) VIH(1) VIL(2) TA TA TA 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. Parameter Supply Voltage Commercial/Industrial/Military Supply Voltage Input High Voltage Com'l/Ind'l Input High Voltage Military Input Low Voltage Commercial/Industrial/Military Operating Temperature Commercial Operating Temperature Industrial Operating Temperature Military Min. 4.5 Typ. 5.0 Max. Unit 5.5 V 0 2.0 2.2 — 0 — — — 0 — — 0.8 V V V V 0 –40 –55 — — — 70 85 125 °C °C °C NOTES: 1. For RT/RS/XI input, VIH = 2.6V (commercial). For RT/RS/XI input, VIH = 2.8V (military). 2. 1.5V undershoots are allowed for 10ns once per cycle. 2 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES DC ELECTRICAL CHARACTERISTICS (Commercial: VCC = 5V ± 10%, TA = 0oC to +70oC; Industrial: VCC = 5V ± 10%, TA = –40oC to +85oC; Military: VCC = 5V ± 10%, TA = –55oC to +125oC) Symbol ILI(3) ILO(4) VOH VOL ICC1(5,6,7) ICC2(5,8) IDT7200L IDT7201LA IDT7202LA Com'l & Ind'l(1) tA = 12, 15, 20, 25, 35, 50 ns Min. Max. 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 Standby Current (R=W=RS=FL/RT=VIH) –1 –10 2.4 — — — 1 10 — 0.4 80 5 IDT7200L IDT7201LA IDT7202LA Military(2) tA = 20, 30, 50, 80 ns Min. Max. Unit –10 –10 2.4 — — — μA μA V V mA mA 10 10 — 0.4 100 15 NOTES: 1. Industrial temperature range product for the 15ns and 25 ns speed grades are available as a standard device. 2. Military speed grades of 50ns and 80ns are only available for the IDT7201LA. 3. Measurements with 0.4 ≤ VIN ≤ VCC. 4. R ≥ VIH, 0.4 ≤ VOUT ≤ VCC. 5. Tested with outputs open (IOUT = 0). 6. Tested at f = 20 MHz. 7. Typical ICC1 = 15 + 2*fS + 0.02*CL*fS (in mA) with VCC = 5V, TA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive load (in pF). 8. All Inputs = VCC - 0.2V or GND + 0.2V. CAPACITANCE (TA = +25°C, f = 1.0 MHz) Symbol CIN COUT Parameter Input Capacitance Output Capacitance Condition VIN = 0V VOUT = 0V Max. 8 8 Unit pF pF NOTE: 1. Characterized values, not currently tested. 5V 1.1K AC TEST CONDITIONS Input Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load TO OUTPUT PIN 680Ω GND to 3.0V 5ns 1.5V 1.5V See Figure 1 30pF* 2679 drw 03 or equivalent circuit Figure 1. Output Load * Includes scope and jig capacitances. 3 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES AC ELECTRICAL CHARACTERISTICS(1) (Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = –40°C to +85°C; Military: VCC = 5V ± 10%, TA = –55°C to +125°C) Commercial IDT7200L12 IDT7201LA12 IDT7202LA12 Min. Max. Com'l & Ind'l(2) IDT7200L15 IDT7201LA15 IDT7202LA15 Min. Max. Com'l & Mil. IDT7200L20 IDT7201LA20 IDT7202LA20 Min. Max. Com'l & Ind'l(2) IDT7200L25 IDT7201LA25 IDT7202LA25 Min. Max. Unit Symbol Parameter tS Shift Frequency — 50 — 40 — 33.3 — 28.5 MHz tRC Read Cycle Time 20 — 25 — 30 — 35 — ns tA Access Time — 12 — 15 — 20 — 25 ns tRR Read Recovery Time 8 — 10 — 10 — 10 — ns tRPW Read Pulse Width(3) 12 — 15 — 20 — 25 — ns tRLZ Read Pulse Low to Data Bus at Low Z(4) 3 — 3 — 3 — 3 — ns tWLZ Write Pulse High to Data Bus at Low Z 5 — 5 — 5 — 5 — ns tDV Data Valid from Read Pulse High 5 — 5 — 5 — 5 — ns tRHZ Read Pulse High to Data Bus at High Z(4) — 12 — 15 — 15 — 18 ns tWC Write Cycle Time 20 — 25 — 30 — 35 — ns tWPW Write Pulse Width(3) 12 — 15 — 20 — 25 — ns tWR Write Recovery Time 8 — 10 — 10 — 10 — ns tDS Data Set-up Time 9 — 11 — 12 — 15 — ns tDH Data Hold Time 0 — 0 — 0 — 0 — ns tRSC Reset Cycle Time 20 — 25 — 30 — 35 — ns tRS Reset Pulse Width(3) 12 — 15 — 20 — 25 — ns tRSS Reset Set-up Time 12 — 15 — 20 — 25 — ns (4,5) (4) tRSR Reset Recovery Time 8 — 10 — 10 — 10 — ns tRTC Retransmit Cycle Time 20 — 25 — 30 — 35 — ns tRT Retransmit Pulse Width(3) 12 — 15 — 20 — 25 — ns tRTS Retransmit Set-up Time(4) 12 — 15 — 20 — 25 — ns tRTR Retransmit Recovery Time 8 — 10 — 10 — 10 — ns tEFL Reset to Empty Flag Low — 12 — 25 — 30 — 35 ns tHFH,FFH Reset to Half-Full and Full Flag High — 17 — 25 — 30 — 35 ns tRTF Retransmit Low to Flags Valid — 20 — 25 — 30 — 35 ns tREF Read Low to Empty Flag Low — 12 — 15 — 20 — 25 ns tRFF Read High to Full Flag High — 14 — 15 — 20 — 25 ns tRPE Read Pulse Width after EF High 12 — 15 — 20 — 25 — ns tWEF Write High to Empty Flag High — 12 — 15 — 20 — 25 ns tWFF Write Low to Full Flag Low — 14 — 15 — 20 — 25 ns tWHF Write Low to Half-Full Flag Low — 17 — 25 — 30 — 35 ns tRHF Read High to Half-Full Flag High — 17 — 25 — 30 — 35 ns tWPF Write Pulse Width after FF High 12 — 15 — 20 — 25 — ns tXOL Read/Write to XO Low — 12 — 15 — 20 — 25 ns tXOH Read/Write to XO High — 12 — 15 — 20 — 25 ns tXI XI Pulse Width 12 — 15 — 20 — 25 — ns tXIR XI Recovery Time 8 — 10 — 10 — 10 — ns tXIS XI Set-up Time 8 — 10 — 10 — 10 — ns (3) NOTES: 1. Timings referenced as in AC Test Conditions. 2. Industrial temperature range product for 15ns and 25ns speed grades are available as a standard device. 3. Pulse widths less than minimum value are not allowed. 4. Values guaranteed by design, not currently tested. 5. Only applies to read data flow-through mode 4 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES AC ELECTRICAL CHARACTERISTICS(1) (Continued) (Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = –40°C to +85°C; Military: VCC = 5V ± 10%, TA = –55°C to +125°C) Symbol Military IDT7200L30 IDT7201LA30 IDT7202LA30 Min. Max. Parameter Commercial IDT7200L35 IDT7201LA35 IDT7202LA35 Min. Max. Com'l & Mil.(2) IDT7200L50 IDT7201LA50 IDT7202LA50 Min. Max. Military(2) IDT7201LA80 Min. Max. Unit tS Shift Frequency — 25 — 22.2 — 15 — 10 MHz tRC Read Cycle Time 40 — 45 — 65 — 100 — ns tA Access Time — 30 — 35 — 50 — 80 ns tRR Read Recovery Time 10 — 10 — 15 — 20 — ns tRPW Read Pulse Width(3) 30 — 35 — 50 — 80 — ns tRLZ Read Pulse Low to Data Bus at Low Z 3 — 3 — 3 — 3 — ns tWLZ Write Pulse High to Data Bus at Low Z(4, 5) 5 — 5 — 5 — 5 — ns (4) tDV Data Valid from Read Pulse High 5 — 5 — 5 — 5 — ns tRHZ Read Pulse High to Data Bus at High Z(4) — 20 — 20 — 30 — 30 ns tWC Write Cycle Time 40 — 45 — 65 — 100 — ns tWPW Write Pulse Width(3) 30 — 35 — 50 — 80 — ns tWR Write Recovery Time 10 — 10 — 15 — 20 — ns tDS Data Set-up Time 18 — 18 — 30 — 40 — ns tDH Data Hold Time 0 — 0 — 5 — 10 — ns tRSC Reset Cycle Time 40 — 45 — 65 — 100 — ns tRS Reset Pulse Width(3) 30 — 35 — 50 — 80 — ns tRSS Reset Set-up Time 30 — 35 — 50 — 80 — ns tRSR Reset Recovery Time 10 — 10 — 15 — 20 — ns tRTC Retransmit Cycle Time 40 — 45 — 65 — 100 — ns tRT Retransmit Pulse Width(3) 30 — 35 — 50 — 80 — ns tRTS Retransmit Set-up Time 30 — 35 — 50 — 80 — ns tRTR Retransmit Recovery Time 10 — 10 — 15 — 20 — ns tEFL Reset to Empty Flag Low — 40 — 45 — 65 — 100 ns tHFH,FFH Reset to Half-Full and Full Flag High — 40 — 45 — 65 — 100 ns tRTF Retransmit Low to Flags Valid — 40 — 45 — 65 — 100 ns tREF Read Low to Empty Flag Low — 30 — 30 — 45 — 60 ns tRFF Read High to Full Flag High — 30 — 30 — 45 — 60 ns tRPE Read Pulse Width after EF High 30 — 35 — 50 — 80 — ns tWEF Write High to Empty Flag High — 30 — 30 — 45 — 60 ns tWFF Write Low to Full Flag Low — 30 — 30 — 45 — 60 ns tWHF Write Low to Half-Full Flag Low — 40 — 45 — 65 — 100 ns tRHF Read High to Half-Full Flag High — 40 — 45 — 65 — 100 ns tWPF Write Pulse Width after FF High 30 — 35 — 50 — 80 — ns tXOL Read/Write to XO Low — 30 — 35 — 50 — 80 ns tXOH Read/Write to XO High — 30 — 35 — 50 — 80 ns tXI XI Pulse Width(3) 30 — 35 — 50 — 80 — ns tXIR XI Recovery Time 10 — 10 — 10 — 10 — ns tXIS XI Set-up Time 10 — 10 — 15 — 15 — ns (4) (4) NOTES: 1. Timings referenced as in AC Test Conditions 2. Military speed grades of 50ns and 80ns are only available for IDT7201LA. 3. Pulse widths less than minimum value are not allowed. 4. Values guaranteed by design, not currently tested. 5. Only applies to read data flow-through mode. 5 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES SIGNAL DESCRIPTIONS Device Mode, this pin acts as the retransmit input. The Single Device Mode is initiated by grounding the Expansion In (XI). The IDT7200/7201A/7202A 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. This feature is useful when less than 256/512/1,024 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. 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). 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. OUTPUTS: 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. 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 256 writes for IDT7200, 512 writes for the IDT7201A and 1,024 writes for the IDT7202A. 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. This output acts as a signal to the next device in the Daisy Chain by providing a pulse to the next device when the previous device reaches the last location of memory. 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. 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. 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 6 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES tRSC tRS RS tRSR tRSS W tRSS R tEFL EF tHFH , tFFH HF, FF 2679 drw 04 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 tRC tRR tA tA tRPW R tDV tRLZ Q0-Q8 tRHZ DATA OUT VALID tWPW tWC DATA OUT VALID tWR W tDS D0-D8 tDH DATA IN VALID DATA IN VALID 2679 drw 05 Figure 3. Asynchronous Write and Read Operation LAST WRITE IGNORED WRITE FIRST READ ADDITIONAL READS FIRST WRITE R W tWFF tRFF 2679 drw 06 FF Figure 4. Full Flag From Last Write to First Read 7 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 LAST READ IGNORED READ COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES FIRST WRITE ADDITIONAL WRITES FIRST READ W R tWEF tREF EF tA DATA OUT VALID VALID 2679 drw 07 Figure 5. Empty Flag From Last Read to First Write tRTC tRT RT tRTS tRTR W,R tRTF HF, EF, FF FLAG VALID 2679 drw 08 Figure 6. Retransmit W tWEF EF tRPE R 2679 drw 09 Figure 7. Minimum Timing for an Empty Flag Coincident Read Pulse R tRFF FF tWPF W 2679 drw 10 Figure 8. Minimum Timing for a Full Flag Coincident Write Pulse 8 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 HALF-FULL OR LESS 2679 drw 11 Figure 9. Half-Full Flag Timing WRITE TO LAST PHYSICAL LOCATION W READ FROM LAST PHYSICAL LOCATION R tXOL tXOH tXOL tXOH 2679 drw 12 XO Figure 10. Expansion Out tXI tXIR XI tXIS W WRITE TO FIRST PHYSICAL LOCATION tXIS READ FROM FIRST PHYSICAL LOCATION R 2679 drw 13 Figure 11. Expansion In OPERATING MODES: depth can be attained by adding additional IDT7200/7201A/7202As. These FIFOs operate in the Depth Expansion mode when the following conditions are met: 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. 1. The first device must be designated by grounding the First Load (FL) control input. 2. All other devices 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. 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 For additional information, refer to Tech Note 9: Cascading FIFOs or FIFO Modules. 9 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES USAGE MODES: 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. WIDTH EXPANSION Word width may be increased simply by connecting the corresponding input control signals of multiple devices. Status flags (EF, FF and HF) can be detected from any one device. Figure 13 demonstrates an 18-bit word width by using two IDT7200/7201A/7202As. Any word width can be attained by adding additional IDT7200/7201A/7202As (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 IDT7200/7201A/7202As as shown in Figure 16. Both Depth Expansion and Width Expansion may be used in this mode. COMPOUND EXPANSION The two expansion techniques described above can be applied together in a straightforward manner to achieve large FIFO arrays (see Figure 15). 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), (HALF-FULL FLAG) (HF) WRITE (W) READ (R) 9 IDT 7200/ 7201A/ 7202A DATA IN (D) FULL FLAG (FF) RESET (RS) 9 DATA OUT (Q) EMPTY FLAG (EF) RETRANSMIT (RT) EXPANSION IN (XI) 2679 drw 14 Figure 12. Block Diagram of Single 256 x 9, 512 x 9, 1,024 x 9 FIFO HF HF 18 9 9 DATA IN (D) WRITE (W) FULL FLAG (FF) RESET (RS) IDT 7200/ 7201A/ 7202A READ (R) IDT 7200/ 7201A/ 7202A EMPTY FLAG (EF) RETRANSMIT (RT) 9 9 XI XI 18 DATA OUT (Q) 2679 drw 15 Figure 13. Block Diagram of 256 x 18, 512 x 18, 1,024 x 18 FIFO Memory Used in Width Expansion Mode 10 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES TABLE 1 — RESET AND RETRANSMIT Single Device Configuration/Width Expansion Mode RS Inputs RT XI Reset Retransmit 0 1 X 0 0 0 Location Zero Location Zero Location Zero Unchanged 0 X 1 X 1 X Read/Write 1 1 0 Increment(1) Increment(1) X X X Mode Read Pointer Internal Status Write Pointer EF Outputs FF HF NOTE: 1. Pointer will increment if flag is HIGH. TABLE 2 — RESET AND FIRST LOAD TRUTH TABLE Depth Expansion/Compound Expansion Mode RS Inputs FL XI Read Pointer Reset First Device Reset All Other Devices 0 0 0 1 (1) (1) Location Zero Location Zero Read/Write 1 X (1) Mode Internal Status Write Pointer Outputs Location Zero Location Zero X X EF FF 0 0 1 1 X X 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, XI = Expansion Input, HF = Half-Full Flag Output XO W D FF 9 9 IDT 7200/ 7201A/ 7202A R EF 9 FL Q VCC XI XO FF FULL 9 IDT 7200/ 7201A/ 7202A EF EMPTY FL XI XO FF 9 RS IDT 7200/ 7201A/ 7202A XI EF FL 2678 drw16 Figure 14. Block Diagram of 768 x 9, 1,536 x 9, 3,072 x 9 FIFO Memory (Depth Expansion) 11 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 R, W, RS COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES Q0-Q8 Q9-Q17 Q(N-8)-Qn Q0-Q8 Q9-Q17 Q(N-8)-Qn IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK D0-D8 IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK D9-D17 D(N-8)-DN D0-DN D9-DN D18-DN D(N-8)-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. Figure 15. Compound FIFO Expansion WA FFA IDT IDT 7200/ 7201A 7201A/ 7202A DA 0-8 RB EFB HFB QB 0-8 SYSTEM A SYSTEM B QA 0-8 RA HFA EFA DB 0-8 IDT 7200/ 7201A/ 7202A WB FFB Figure 16. Bidirectional FIFO Mode 12 2679 drw 18 2679 drw 17 IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9 COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES DATA IN W tRPE R EF tWLZ tWEF tREF tA DATA OUT DATA OUT VALID 2679 drw 19 Figure 17. Read Data Flow-Through Mode R tWPF W tRFF FF tDH tWFF DATA DATA IN VALID tDS tA DATA OUT IN DATA OUT VALID 2679 drw 20 Figure 18. Write Data Flow-Through Mode 13 ORDERING INFORMATION XXXX X XXX X Device Type Power Speed Package X X X Process/ Temperature Range Blank 8 Blank I (1) B G (3) (4) Tube or Tray Tape and Reel Commercial (0oC to +70oC) Industrial (-40oC to +85oC) Military (-55oC to +125oC) Compliant to MIL-STD-883, Class B Green P TP D TD J SO L Plastic DIP (7201 & 7202 Only) P28-1 Plastic Thin DIP P28-2 CERDIP (7201 & 7202 Only) D28-1 Thin CERDIP D28-3 Plastic Leaded Chip Carrier PLCC J32-1 SOIC SO28-3 Leadless Chip Carrier L32-1 (7201 & 7202 Only) LCC 12 15 20 25 30 35 50 80 Commercial Only Commercial and Industrial Commercial and Military Commercial and Industrial Military Only Commercial Only Commercial and (Military only for 7201) Military only for 7201 (2) LA Low Power 7200 7201 7202 7280 7281 7282 256 x 9-Bit FIFO 512 x 9-Bit FIFO 1,024 x 9-Bit FIFO 256 x 9-Bit DUAL FIFO 512 x 9-Bit DUAL FIFO 1,024 x 9-Bit DUAL FIFO NOTES: 1. Industrial temperature range product is available for the 15ns and 25ns as a standard product. 2. "A" to be included for IDT7201 and IDT7202 ordering part number. 3. Green parts are available. For specific speeds and packages contact your local sales office. 4. For "P", Plastic Dip, when ordering green package, the suffix is "PDG". Access Time (tA) Speed in Nanoseconds See 7280/7281/7282 data sheet for details 2679 drw 21 DATASHEET DOCUMENT HISTORY 05/02/2001 04/03/2006 10/22/2008 6/29/2012 pgs. pgs. pg. pgs. 1, 2, 3, 4, 5 and 14. 1 and 14. 1. 1 and 14. 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 14 for Tech Support: 408-360-1753 email: [email protected]