IDT71P74104S250BQ

18Mb Pipelined QDR™II SRAM Burst of 4 Features x x x x x x Description Advance Information IDT71P74204 IDT71P74104 IDT71P74804 IDT71P74604 x x x x x x 18Mb Density (2Mx8, 2Mx9, 1Mx18, 512kx36) Separate, Independent Read and Write Data Ports Supports concurrent transactions Dual Echo Clock Output 4-Word Burst on all SRAM accesses Multiplexed Address Bus One Read or One Write request per clock cycle DDR (Double Data Rate) Data Bus Four word burst data per two clock cycles on each port Four word transfers per clock cycle Depth expansion through Control Logic HSTL (1.5V) inputs that can be scaled to receive signals from 1.4V to 1.9V. Scalable output drivers Can drive HSTL, 1.8V TTL or any voltage level from 1.4V to 1.9V. Output Impedance adjustable from 35 ohms to 70 ohms 1.8V Core Voltage (VDD) 165-ball, 1.0mm pitch, 15mm x 17mm fBGA Package JTAG Interface The IDT QDRIITM Burst of four SRAMs are high-speed synchronous memories with independent, double-data-rate (DDR), read and write data ports. This scheme allows simultaneous read and write access for the maximum device throughput, with four data items passed with each read or write. Four data word transfers occur per clock cycle, providing quad-data-rate (QDR) performance. Comparing this with standard SRAM common I/O (CIO), single data rate (SDR) devices, a four to one increase in data access is achieved at equivalent clock speeds. Considering that QDRII allows clock speeds in excess of standard SRAM devices, the throughput can be increased well beyond four to one in most applications. Using independent ports for read and write data access, simplifies system design by eliminating the need for bi-directional buses. All buses associated with the QDRII are unidirectional and can be optimized for signal integrity at very high bus speeds. The QDRII has scalable output impedance on its data output bus and echo clocks, allowing the user to tune the bus for low noise and high performance. The QDRII has a single SDR address bus with read addresses and write addresses multiplexed. The read and write addresses interleave with each occurring a maximum of every other cycle. In the event that no operation takes place on a cycle, the subsequest cycle may begin with either a read or write. During write operations, the writing of individual bytes may be blocked through the use of byte or nibble write control signals. The QDRII has echo clocks, which provide the user with a clock Functional Block Diagram D (Note1) DATA REG WRITE DRIVER SENSE AMPS OUTPUT REG SA OUTPUT SELECT OUTPUT SELECT (Note2) ADD REG WRITE/READ DECODE (Note2) R W BWx (Note3) CTRL LOGIC 18M MEMORY ARRAY (Note1) Q K K C C CLK GEN SELECT OUTPUT CONTROL CQ CQ 6111 drw16 Notes 1) Represents 8 data signal lines for x8, 9 signal lines for x9, 18 sig nal lines for x18, and 36 sig nal lines for x36 2) Represents 19 address signal lines for x8 and x9, 18 address signal lines for x18, and 17 address signal lines for x36. 3) Represents 1 sig nal line for x9, 2 signal lines for x18, and four signal lines for x36. On x8 parts, the BW is a “nibble write” and there are 2 signal lines. MARCH 2004 1 ©2003 Integrated Device Technology, Inc. “QDR SRAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress Semiconductor, IDT, and Micron Technology, Inc. “ DSC-6111/00 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range that is precisely timed to the data output, and tuned with matching impedance and signal quality. The user can use the echo clock for downstream clocking of the data. Echo clocks eliminate the need for the user to produce alternate clocks with precise timing, positioning, and signal qualities to guarantee data capture. Since the echo clocks are generated by the same source that drives the data output, the relationship to the data is not significantly affected by voltage, temperature and process, as would be the case if the clock were generated by an outside source. All interfaces of the QDRII SRAM are HSTL, allowing speeds beyond SRAM devices that use any form of TTL interface. The interface can be scaled to higher voltages (up to 1.9V) to interface with 1.8V systems if necessary. The device has a VDDQ and a separate Vref, allowing the user to designate the interface operational voltage, independent of the device core voltage of 1.8V VDD. The output impedance control allows the user to adjust the drive strength to adapt to a wide range of loads and transmission lines. The device is capable of sustaining full bandwidth on both the input and output ports simultaneously. All data is in two word bursts, with addressing capability to the burst level. edge of CQ, and the falling edge of CQ. The rising edge of C generates the rising edge of CQ and the falling edge of CQ. This scheme improves the correlation of the rising and falling edges of the echo clock and will improve the duty cycle of the individual signals. The echo clock is very closely aligned with the data, guaranteeing that the echo clock will remain closely correlated with the data, within the tolerances designated. Read and Write Operations QDRII devices internally store the 4 words of the burst as a single, wide word and will retain their order in the burst. There is no ability to address to the single word level or reverse the burst order; however, the byte and nibble write signals can be used to prevent writing any individual bytes, or combined to prevent writing one word of the burst. Read and write operations may be interleaved with each occurring on every other clock cycle. In the event that two reads or two writes are requested on adjacent clock cycles, the operation in progress will complete and the second request will be ignored. In the event that both a read and write are requested simultaneously, the read operation will win and the write operation will be ignored. Read operations are initiated by holding the read port select (R) low, and presenting the read address to the address port during the rising edge of K which will latch the address. The data will then be read and will appear at the device output at the designated time in correspondence with the C and C clocks. Write operations are initiated by holding the write port select (W) low and presenting the designated write address to the address bus. The QDRII SRAM will receive the address on the rising edge of clock K. On the following rising edge of K clock, the QDRII SRAM will receive the first data item of the four word burst on the data bus. Along with the data, the byte (BW) or nibble write (NW) inputs will be accepted, indicating which bytes of the data inputs should be written to the SRAM. On the rising edge of K, the next word of the write burst and BW/NW will be accepted. The following K and K will receive the last two words of the four word burst, with their BW/NW enables. Clocking The QDRII SRAM has two sets of input clocks, namely the K, K clocks and the C, C clocks. In addition, the QDRII has an output “echo” clock, CQ, CQ. The K and K clocks are the primary device input clocks. The K clock is, used to clock in the control signals (R, W and BWx/NWx), the address, first and third words of the data burst during a write operation. The K clock is used to clock in the control signals (BWx or NWx) and the second and fourth words of the data burst during a write operation. The K and K clocks are also used internally by the SRAM. In the event that the user disables the C and C clocks, the K and K clocks will be used to clock the data out of the output register and generate the echo clocks. The C and C clocks may be used to clock the data out of the output register during read operations and to generate the echo clocks. C and C must be presented to the SRAM within the timing tolerances. The output data from the QDRII will be closely aligned to the C and C input, through the use of an internal DLL. When C is presented to the QDRII SRAM, the DLL will have already internally clocked the data to arrive at the device output simultaneously with the arrival of the C clock. The C and second data item of the burst will also correspond. The third and fourth data items will follow on the next clock cycle. Output Enables The QDRII SRAM automatically enables and disables the Q[X:0] outputs. When a valid read is in progress, and data is present at the output, the output will be enabled. If no valid data is present at the output (read not active), the output will be disabled (high impedance). The echo clocks will remain valid at all times and cannot be disabled or turned off. During power-up the Q outputs will come up in a high impedance state. Single Clock Mode The QDRII SRAM may be operated with a single clock pair. C and C may be disabled by tying both signals high, forcing the outputs and echo clocks to be controlled instead by the K and K clocks. DLL Operation The DLL in the output structure of the QDRII SRAM can be used to closely align the incoming clocks C and C with the output of the data, generating very tight tolerances between the two. The user may disable the DLL by holding Doff low. With the DLL off, the C and C (or K and K if C and C are not used) will directly clock the output register of the SRAM. With the DLL off, there will be a propagation delay from the time the clock enters the device until the data appears at the output. Programmable Impedance An external resistor, RQ, must be connected between the ZQ pin on the SRAM and Vss to allow the SRAM to adjust its output drive impedance. The value of RQ must be 5X the value of the intended drive impedance of the SRAM. The allowable range of RQ to guarantee impedance matching with a tolerance of +/- 10% is between 175 ohms and 350 ohms, with VDDQ = 1.5V. The output impedance is adjusted every 1024 clock cycles to correct for drifts in supply voltage and temperature. If the user wishes to drive the output impedance of the SRAM to it’s lowest value, the ZQ pin may be tied to VDDQ. Echo Clock The echo clocks, CQ and CQ, are generated by the C and C clocks (or K, K if C, C are disabled). The rising edge of C generates the rising 6.42 2 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Definitions Symbol Pin Function Description Data input signals, sampled on the rising edge of K and K c locks during valid write operations 2M x 8 -- D[7:0] 2M x 9 -- D[8:0] 1M x 18 -- D[17:0] 512K x 36 -- D[35:0] Byte Write Select 0, 1, 2, and 3 are active LOW. Sampled on the rising edge of the K and again on the rising edge of K clocks during write operations. Used to select which byte is written into the device during the current portion of the write operations . Bytes not written remain unaltered. All the byte writes are sampled on the same edge as the data. Deselecting a Byte Write Select will cause the corresponding byte of data to be ignored and not written in to the device. 2M x 9 -- BW0 c ontrols D[8:0] 1M x 18 -- BW0 controls D[8:0] and BW1 controls D[17:9] 512K x 36 -- BW0 controls D[8:0], BW1 c ontrols D[17:9], BW2 c ontrols D[26:18] and BW3 controls D[35:27] Nibble Write Select 0 and 1 are active LOW. Available only on x8 bit parts instead of Byte Write Selects. Sampled on the rising edge of the K and K c locks during write op erations. Used to select which nibble is written into the device during the current portion of the write operations. Nibbles no t written remain unaltered. All the nibble writes are sampled on the same edge as the data. Deselecting a Nibble Write Select will cause the corresponding nibble of data to be ignored and not written in to the device. Address inputs are sampled on the rising edge of K clock during active read or write operations. These address inputs are multiplexed so a read and write can be initiated on alternate clock cycles. These inputs are ignored when the appropriate port is deselected. D[X:0] Input Synchronous BW0, BW1 BW2, BW3 Input Synchronous NW0, NW1 Input Synchronous SA Input Synchronous Q[X:0] Data Output signals. These pins drive out the requested data during a Read operation. Valid data is driven out on the rising Output Synchronous edge of both the C and C clocks during Read operations or K and K when operating in single clock mode. When the Read port is deselected, Q[X:0] are automatically three-stated. Write Control Logic active Low. Sampled on the rising edge of the positive input clock (K). When asserted active, a write operation in initiated. Deasserting will deselect the Write port, causing D[X:0] to be ignored. If a write operation has successfully been initiated, it will continue to completion, ignoring the W on the following clock cycle. This allows the user to continuously hold W low while bursting data into the SRAM. Read Control Logic, active LOW. Sampled on the rising edge of Positive Input Clock (K). When active, a read operation is initiated. Deasserting will cause the Read port to be deselected. When deselected, the pending access is allowed to complete and the output drivers are automatically three-stated following the next rising edge of the C clock. Each read access consists of a burst of four sequential transfer. If a read operation has successfully been initiate d, it will continue to completion, ignoring the R o n the following clock cycle. This allows the user to continuously hold R low while bursting data from the SRAM. Positive Output Clock Input. C is used in conjunction with C to clock out the Read data from the device. C and C can be used together to deskew the flight times of various devices on the board back to the controller. See application example for further details. Negative Output Clock Input. C is used in conjunction with C to clock out the Read data from the device. C and C can be used together to deskew the flight times of various devices on the board back to the controller. See application example for further details. Positive Input Clock Input. The rising edge of K is used to capture synchronous inputs to the device and to drive out data through Q[X:0] when in single cloc k mode. All accesses are initiated on the rising edge of K. Negative Input Clock Input. K is used to capture synchronous inputs being presented to the device and to drive out data through Q[X:0] when in single clock mode. Synchronous Echo clock outputs. The rising edges of these outputs are tightly matched to the synchronous data outputs and can be used as a data valid indication. These signals are free running and do not stop when the output data is threestated. Output Impedance Matching Input. This input is us ed to tune the device outputs to the sys tem data bus impedance. Q[X:0] output impedance is set to 0.2 x RQ, where RQ is a resistor connected between ZQ and ground. Alternately, this pin can be connected directly to VDDQ, which enables the minimum impedance mode. This pin cannot be connected directly to GND or left unconnected. 6111 tbl 02a W Input Synchronous R Input Synchronous C Input Clock C Input Clock K Input Clock K Input Clock CQ, CQ Output Clock ZQ Input 6.42 3 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Definitions continued Symbol Pin Function Description DLL Turn Off. When low this input will turn off the DLL inside the device. The AC timings with the DLL turned off will be different from those listed in this data sheet. There will be an increased propagation delay from the incidence of C and C to Q, or K and K to Q as configured. The propagation delay is not a tested parameter, but will be similar to the propagation delay of other SRAM devic es in this speed grade. TDO pin for JTAG. TCK pin for JTAG. TDI pin for JTAG. An internal resistor will pull TDI to V DD when the pin is unconnected. TMS pin for JTAG. An internal resistor will pull TMS to V DD when the pin is unconnected. No connects inside the package. Can be tied to any voltage level Reference Voltage input. Static input used to set the reference le vel for HSTL inputs and Outputs as well as AC measurement points. Power supply inputs to the co re of the device. Should be connected to a 1.8V power supply. Ground for the device. Should be connected to ground of the system. Power supply for the outputs of the device. Should be connected to a 1.5V power supply for HSTL or scaled to the desired output voltage. 6111 tbl 02b Doff Input TDO TCK TDI TMS NC Output Input Input Input No Connect Input Reference Power Supply Ground Power Supply VREF VDD VSS VDDQ 6.42 4 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Configuration 2M x 8 1 A B C D E F G H J K L M N P R 2 VSS/ SA (2) NC NC D4 NC NC D5 V REF NC NC Q6 NC D7 NC TCK 3 SA NC NC NC Q4 NC Q5 VDDQ NC NC D6 NC NC Q7 SA 4 5 6 7 NC 8 9 SA NC NC NC NC NC NC VDDQ NC NC NC NC NC NC SA 10 VSS/ SA (1) NC NC NC D2 NC NC VREF Q1 NC NC NC NC NC TMS 6111 tbl 12 11 CQ Q3 D3 NC Q2 NC NC ZQ D1 NC Q0 D0 NC NC TDI CQ NC NC NC NC NC NC W SA VSS VSS V DDQ V DDQ V DDQ V DDQ V DDQ V DDQ V DDQ VSS VSS SA SA NW1 NC SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS SA C R SA V SS V SS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ V SS V SS SA SA NW0 SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA Doff NC NC NC NC NC NC TDO C 165-ball FBGA Pinout TOP VIEW NOTES: 1. A10 is reserved for the 36Mb expansion address. 2. A2 is reserved for the 72Mb expansion address. 6.42 5 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Configuration 2M x 9 1 A B C D E F G H J K L M N P R 2 VSS/ SA (2) NC NC D4 NC NC D5 VREF NC NC Q6 NC D7 NC TCK 3 SA NC NC NC Q4 NC Q5 VDDQ NC NC D6 NC NC Q7 SA 4 5 NC NC SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA 6 7 NC 8 9 SA NC NC NC NC NC NC VDDQ NC NC NC NC NC NC SA 10 VSS/ SA ( 1) NC NC NC D2 NC NC VREF Q1 NC NC NC NC D8 TMS 11 CQ Q3 D3 NC Q2 NC NC ZQ D1 NC Q0 D0 NC Q8 TDI CQ NC NC NC NC NC NC W SA VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS SA SA K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS SA C R SA VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS SA SA BW SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA Doff NC NC NC NC NC NC TDO C 6111 tbl 12a 165-ball FBGA Pinout TOP VIEW NOTES: 1. A10 is reserved for the 36Mb expansion address. 2. A2 is reserved for the 72Mb expansion address. 6.42 6 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Configuration 1M x 18 1 A B C D E F G H J K L M N P R 2 VSS/ SA ( 3) Q9 NC D11 NC Q12 D13 V REF NC NC Q15 NC D17 NC TCK 3 NC/ SA ( 1) D9 D10 Q10 Q11 D12 Q13 VDDQ D14 Q14 D15 D16 Q16 Q17 SA 4 5 6 7 NC 8 9 SA NC NC NC NC NC NC VDDQ NC NC NC NC NC NC SA 10 VSS/ SA ( 2) NC Q7 NC D6 NC NC VREF Q4 D3 NC Q1 NC D0 TMS 11 CQ Q8 D8 D7 Q6 Q5 D5 ZQ D4 Q3 Q2 D2 D1 Q0 TDI CQ NC NC NC NC NC NC W SA VSS VSS V DDQ V DDQ V DDQ V DDQ V DDQ V DDQ V DDQ VSS VSS SA SA BW1 NC SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS SA C R SA V SS V SS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ V SS V SS SA SA BW0 SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA Doff NC NC NC NC NC NC TDO C 6111 tbl 12b 165-ball FBGA Pinout TOP VIEW NOTES: 1. A3 is reserved for the 36Mb expansion address. 2. A10 is reserved for the 72Mb expansion address. This must be tied or driven to VSS on the 1M x 18 QDRII Burst of 4 (71P74804) devices. 3. A2 is reserved for the 144Mb expansion address. This must be tied or driven to VSS on the 1M x 18 QDRII Burst of 4 (71P74804) devices. 6.42 7 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Pin Configuration 512K x 36 1 A B C D E F G H J K L M N P R 2 VSS/ SA ( 4) Q18 Q28 D20 D29 Q21 D22 VREF Q31 D32 Q24 Q34 D26 D35 TCK 3 NC/ SA ( 2) D18 D19 Q19 Q20 D21 Q22 VDDQ D23 Q23 D24 D25 Q25 Q26 SA 4 5 6 7 8 9 NC/ SA ( 1) D17 D16 Q16 Q15 D14 Q13 VDDQ D12 Q12 D11 D10 Q10 Q9 SA 10 VSS SA ( 3) Q17 Q7 D15 D6 Q14 D13 VREF Q4 D3 Q11 Q1 D9 D0 TMS 6111 tb l 12c 11 CQ Q8 D8 D7 Q6 Q5 D5 ZQ D4 Q3 Q2 D2 D1 Q0 TDI CQ Q27 D27 D28 Q29 Q30 D30 W SA VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS SA SA BW2 BW3 SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS SA C BW1 BW0 SA VSS VSS VDD VDD VDD VDD VDD VSS VSS SA SA SA R SA VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS SA SA Doff D31 Q32 Q33 D33 D34 Q35 TDO C 165-ball FBGA Pinout TOP VIEW NOTES: 1. A9 is reserved for the 36Mb expansion address. 2. A3 is reserved for the 72Mb expansion address. 3. A10 is reserved for the 144Mb expansion address. This must be tied or driven to VSS on the 512K x 36 QDRII Burst of 4 (71P74604) devices. 4. A2 is reserved for the 288Mb expansion address. This must be tied or driven to VSS on the 512K x 36 QDRII Burst of 4 (71P74604) devices. 6.42 8 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Absolute Maximum Ratings(1) (2) Symbol VTERM VTERM VTERM VTERM TBIAS TSTG IOUT Rating Supply Voltage on VDD with Respect to GND Supply Voltage on VDDQ with Respect to GND Voltage on Input terminals with respect to GND Voltage on Output and I/O terminals with respect to GND. Temperature Under Bias Storage Temperature Continuous Current into Outputs Value –0.5 to +2.9 –0.5 to VDD + 0.3 –0.5 to VDD + 0.3 –0.5 to VDDQ + 0.3 –55 to +125 –65 to +150 + 20 Unit V V V V °C °C mA Capacitance (TA = +25°C, f = 1.0MHz)(1) Symbol CIN CCLK CO Parameter Input Capacitance Clock Input Capacitance Output Capacitance V DD = 1.8V VDDQ = 1.5V Conditions Max. 5 6 7 Unit pF pF pF 6111 tbl 06 NOTE: 1. Tested at characterization and retested after any design or process change that may affect these parameters. NOTES: 6111 tbl 05 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. 2. VDDQ must not exceed VDD during normal operation. Recommended DC Operating and Temperture Conditions Symbol VDD VDDQ VSS VREF TA Parameter Power Supply Voltage I/O Supply Voltage Ground Input Reference Voltage Ambient Temperature (1) Min. 1.7 1.4 0 0.68 0 Typ. 1.8 1.5 0 V DDQ/2 25 Max. 1.9 1.9 0 0.95 +70 Unit V V V V o c Write Descriptions (1,2) Signal Write Byte 0 Write Byte 1 Write Byte 2 Write Byte 3 Write Nibble 0 Write Nibble 1 NOTE: 1. During production testing, the case temperarure equals the ambient temperature. 6111 tbl 04 BW0 L X X X X X BW1 X L X X X X BW2 X X L X X X BW3 X X X L X X NW0 X X X X L X NW1 X X X X X L 6111 tbl 09 NOTES: 1) All byte write (BW x) and nibble write (NWx) signals are sampled on the rising edge of K and again on K. The data that is present on the data bus in the designated byte/nibble will be latched into the input if the corresponding BWx or NW x is held low. The rising edge of K will sample the first and third bytes/ nibbles of the four word burst and the rising edge of K will sample the second and fourth bytes/nibbles of the four word burst. 2) The availability of the BWx or NWx on designated devices is described in the pin description table. 3) The QDRII Burst of four SRAM has data forwarding. A read request that is initiated on the cycle following a write request to the same address will produce the newly written data in response to the read request. 6.42 9 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Application Example W SRAM #1 D SA R W B W 0 B W 1 C C ZQ Q KK 250 SRAM #4 VT R Data In Data Out Address R W BWx/NWx MEMORY CONTROLLER Return CLK Source CLK Return CLK Source CLK Ω D SA R W BW0 BW1 CC ZQ Q KK R R R R R 250 Ω VT VT VT R R R = 50Ω VT = VREF 6111 drw 20 610 .42 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range DC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range (VDD = 1.8 ± 100mV, VDDQ = 1.4V to 1.9V) Param eter Inp ut Le akag e Curre nt Outp ut Le akag e Curre nt Sym bol IIL IOL Test Conditions V DD = M ax V IN = V SS to V DD Q Outp ut Disab le d 333M H Z Op e rating Curre nt (x36,x18,x 9,x 8): DDR V DD = M ax , IO UT = 0 m A (o utp uts o p e n), Cyc le Tim e > tKH K H M in 300M H Z 250M H Z 300M Hz 167M Hz 333M H Z De vice De s e le cte d (in NOP state ) IO UT = 0 m A (o utp uts o p e n), f=M ax, All Inp uts < 0.2V o r > V DD -0.2V 300M H Z 250M H Z 200M Hz 167M Hz Outp ut Hig h Vo ltag e Outp ut Lo w Vo ltag e Outp ut Hig h Vo ltag e Outp ut Lo w Vo ltag e V O H1 V OL1 V O H2 V OL2 RQ = 250Ω, IOH = - 15m A RQ = 250Ω, IOL = 1 5mA IOH = - 0.1m A IOL = 0 .1m A Min -10 -10 V DD Q /2-0.12 V DD Q /2-0.12 V DD Q -0.2 V SS Max +10 +10 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD V DD Q /2+0.12 V DD Q /2+0.12 V DD Q 0.2 V V V V 3,7 4,7 5 6 6111 tb l 10 c Unit µA µA Note IDD mA 1 Stand b y Curre nt: NOP IS B1 mA 2 NOTES: 1. Operating Current is measured at 100% bus utilization. 2. Standby Current is only after all pending read and write burst operations are completed. 3. Outputs are impedance-controlled. IOH = -(VDDQ/2)/(RQ/5) and is guaranteed by device characterization for 175Ω < RQ < 350 Ω. This parameter is tested at RQ = 250Ω, which gives a nominal 50Ω output impedance. 4. Outputs are impedance-controlled. IOL = (V DDQ/2)/(RQ/5) and is guaranteed by device characterization for 175Ω < RQ < 350Ω. This parameter is tested at RQ = 250Ω, which gives a nominal 50Ω output impedance. 5. This measurement is taken to ensure that the output has the capability of pulling to the VDDQ rail, and is not intended to be used as an impedance measurement point. 6. This measurement is taken to ensure that the output has the capability of pulling to Vss, and is not intended to be used as an impedance measurement point. 7. Programmable Impedance Mode. 611 .42 IDT71P74204 (2M x 8-Bit), 71P74104 (2M x 9-Bit), 71P74804 (1M x 18-Bit) 71P74604 (512K x 36-Bit) Advance Information 18 Mb QDR II SRAM Burst of 4 Commercial Temperature Range Input Electrical Characteristics Over the Operating Temperature and Supply Voltage Range (VDD = 1.8 ± 100mV, VDDQ = 1.4V to 1.9V) PARAMETER Input High Voltage, DC Input Low Voltage, DC Input High Voltage, AC Input Low Voltage, AC SYMBOL VIH (DC ) V IL (DC) VIH (AC) V IL (AC) MIN VREF + 0.1 -0.3 VREF + 0.2 MAX VDDQ + 0.3 VREF -0.1 VREF -0.2 UNIT V V V V NOTES 1,2 1,3 4,5 4,5 6111 tbl 10d NOTES : 1. These are DC test criteria. DC design criteria is VREF + 50mV. The AC VIH/VIL levels are defined separately for measuring timing parameters. 2. VIH (Max) DC = VDDQ+0.3, VIH (Max) AC = VDD +0.5V (pulse width