CY7C1265V18-300BZXC

CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 36-Mbit QDR™-II+ SRAM 4-Word Burst Architecture (2.5 Cycle Read Latency) Features • Separate independent read and write data ports — Supports concurrent transactions • 300 MHz to 400 MHz clock for high bandwidth • 4-Word Burst for reducing address bus frequency • Double Data Rate (DDR) interfaces on both read and write ports (data transferred at 800 MHz) at 400 MHz • Read latency of 2.5 clock cycles • Two input clocks (K and K) for precise DDR timing — SRAM uses rising edges only • Echo clocks (CQ and CQ) simplify data capture in high-speed systems • Single multiplexed address input bus latches address inputs for both read and write ports • Separate Port Selects for depth expansion • Data valid pin (QVLD) to indicate valid data on the output • Synchronous internally self-timed writes • Available in x8, x9, x18, and x36 configurations • Full data coherency providing most current data • Core VDD = 1.8V ± 0.1V; IO VDDQ = 1.4V to VDD[1] • HSTL inputs and Variable drive HSTL output buffers • Available in 165-ball FBGA package (15 x 17 x 1.4 mm) • Offered in both Pb-free and non Pb-free packages • JTAG 1149.1 compatible test access port • Delay Lock Loop (DLL) for accurate data placement Functional Description The CY7C1261V18, CY7C1276V18, CY7C1263V18, and CY7C1265V18 are 1.8V Synchronous Pipelined SRAMs, equipped with Quad Data Rate-II+ (QDR-II+) architecture. QDR-II+ architecture consists of two separate ports to access the memory array. The read port has dedicated data outputs to support read operations and the write port has dedicated data inputs to support write operations. QDR-II+ architecture has separate data inputs and data outputs to completely eliminate the need to “turn around” the data bus required with common IO devices. Each port is accessed through a common address bus. Addresses for read and write addresses are latched on alternate rising edges of the input (K) clock. Accesses to the QDR-II+ read and write ports are completely independent of one another. To maximize data throughput, both read and write ports are equipped with Double Data Rate (DDR) interfaces. Each address location is associated with four 8-bit words (CY7C1261V18), 9-bit words (CY7C1276V18), 18-bit words (CY7C1263V18), or 36-bit words (CY7C1265V18) that burst sequentially into or out of the device. Because data can be transferred into and out of the device on every rising edge of both input clocks (K and K), memory bandwidth is maximized while simplifying system design by eliminating bus “turn-arounds”. Depth expansion is accomplished with Port Selects for each port. Port selects enable each port to operate independently. All synchronous inputs pass through input registers controlled by the K or K input clocks. All data outputs pass through output registers controlled by the K or K input clocks. Writes are conducted with on-chip synchronous self-timed write circuitry. Configurations With Read Cycle Latency of 2.0 cycles: CY7C1261V18 – 4M x 8 CY7C1276V18 – 4M x 9 CY7C1263V18 – 2M x 18 CY7C1265V18 – 1M x 36 Selection Guide 400 MHz Maximum Operating Frequency Maximum Operating Current 400 1330 375 MHz 375 1240 333 MHz 333 1120 300 MHz 300 1040 Unit MHz mA Note 1. The QDR consortium specification for VDDQ is 1.5V + 0.1V. The Cypress QDR devices exceed the QDR consortium specification and are capable of supporting VDDQ = 1.4V to VDD. Cypress Semiconductor Corporation Document Number: 001-06366 Rev. *C • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600 Revised May 14, 2007 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Logic Block Diagram (CY7C1261V18) D[7:0] 8 Write Reg Write Reg Write Reg Write Reg Write Add. Decode A(19:0) 20 Read Add. Decode Address Register Address Register 20 A(19:0) 1M x 8 Array 1M x 8 Array 1M x 8 Array 1M x 8 Array K K CLK Gen. Control Logic RPS DOFF Read Data Reg. 32 Control Logic 16 16 Reg. Reg. 8 Reg. 8 CQ CQ Q[7:0] QVLD VREF WPS NWS[1:0] Logic Block Diagram (CY7C1276V18) D[8:0] 9 Write Reg Write Reg Write Reg Write Reg Write Add. Decode A(19:0) 20 Read Add. Decode Address Register Address Register 20 A(19:0) 1M x 9 Array 1M x 9 Array 1M x 9 Array 1M x 9 Array K K CLK Gen. Control Logic RPS DOFF Read Data Reg. 36 Control Logic 18 18 Reg. Reg. 9 Reg. 9 CQ CQ Q[8:0] QVLD VREF WPS BWS[0] Document Number: 001-06366 Rev. *C Page 2 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Logic Block Diagram (CY7C1263V18) D[17:0] 18 Write Reg Write Reg Write Reg Write Reg Write Add. Decode A(18:0) 19 Read Add. Decode Address Register Address Register 19 A(18:0) 512K x 18 Array 512K x 18 Array 512K x 18 Array 512K x 18 Array K K CLK Gen. Control Logic RPS DOFF Read Data Reg. 72 Control Logic 36 36 Reg. Reg. 18 Reg. CQ CQ Q[17:0] 18 QVLD VREF WPS BWS[1:0] Logic Block Diagram (CY7C1265V18) D[35:0] 36 Write Reg Write Reg Write Reg Write Reg Write Add. Decode A(17:0) 18 Read Add. Decode Address Register Address Register 18 A(17:0) 256K x 36 Array 256K x 36 Array 256K x 36 Array 256K x 36 Array K K CLK Gen. Control Logic RPS DOFF VREF WPS BWS[3:0] Read Data Reg. 144 Control Logic 72 72 Reg. Reg. 36 Reg. 36 CQ CQ Q[35:0] QVLD Document Number: 001-06366 Rev. *C Page 3 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Pin Configurations 165-Ball FBGA (15 x 17 x 1.4 mm) Pinout CY7C1261V18 (4M x 8) 1 A B C D E F G H J K L M N P R CQ NC NC NC NC NC NC DOFF NC NC NC NC NC NC TDO 2 NC/72M NC NC D4 NC NC D5 VREF NC NC Q6 NC D7 NC TCK 3 A NC NC NC Q4 NC Q5 VDDQ NC NC D6 NC NC Q7 A 4 WPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 5 NWS1 NC/288M A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 6 K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS A QVLD NC 7 NC/144M NWS0 A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 8 RPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 9 A NC NC NC NC NC NC VDDQ NC NC NC NC NC NC A 10 A NC NC NC D2 NC NC VREF Q1 NC NC NC NC NC TMS 11 CQ Q3 D3 NC Q2 NC NC ZQ D1 NC Q0 D0 NC NC TDI CY7C1276V18 (4M x 9) 1 A B C D E F G H J K L M N P R CQ NC NC NC NC NC NC DOFF NC NC NC NC NC NC TDO 2 NC/72M NC NC D5 NC NC D6 VREF NC NC Q7 NC D8 NC TCK 3 A NC NC NC Q5 NC Q6 VDDQ NC NC D7 NC NC Q8 A 4 WPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 5 NC NC/288M A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 6 K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS A QVLD NC 7 NC/144M BWS0 A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 8 RPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 9 A NC NC NC NC NC NC VDDQ NC NC NC NC NC NC A 10 A NC NC NC D3 NC NC VREF Q2 NC NC NC NC D0 TMS 11 CQ Q4 D4 NC Q3 NC NC ZQ D2 NC Q1 D1 NC Q0 TDI Document Number: 001-06366 Rev. *C Page 4 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Pin Configurations (continued) 165-Ball FBGA (15 x 17 x 1.4 mm) Pinout CY7C1263V18 (2M x 18) 1 A B C D E F G H J K L M N P R CQ NC NC NC NC NC NC DOFF NC NC NC NC NC NC TDO 2 NC/144M Q9 NC D11 NC Q12 D13 VREF NC NC Q15 NC D17 NC TCK 3 A D9 D10 Q10 Q11 D12 Q13 VDDQ D14 Q14 D15 D16 Q16 Q17 A 4 WPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 5 BWS1 NC A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 6 K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS A QVLD NC 7 NC/288M BWS0 A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 8 RPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 9 A NC NC NC NC NC NC VDDQ NC NC NC NC NC NC A 10 NC/72M 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 CY7C1265V18 (1M x 36) 1 A B C D E F G H J K L M N P R CQ Q27 D27 D28 Q29 Q30 D30 DOFF D31 Q32 Q33 D33 D34 Q35 TDO 2 Q18 Q28 D20 D29 Q21 D22 VREF Q31 D32 Q24 Q34 D26 D35 TCK 3 D18 D19 Q19 Q20 D21 Q22 VDDQ D23 Q23 D24 D25 Q25 Q26 A 4 WPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 5 BWS2 BWS3 A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 6 K K NC VSS VSS VSS VSS VSS VSS VSS VSS VSS A QVLD NC 7 BWS1 BWS0 A VSS VSS VDD VDD VDD VDD VDD VSS VSS A A A 8 RPS A VSS VSS VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VDDQ VSS VSS A A 9 A D17 D16 Q16 Q15 D14 Q13 VDDQ D12 Q12 D11 D10 Q10 Q9 A 10 NC/144M Q17 Q7 D15 D6 Q14 D13 VREF Q4 D3 Q11 Q1 D9 D0 TMS 11 CQ Q8 D8 D7 Q6 Q5 D5 ZQ D4 Q3 Q2 D2 D1 Q0 TDI NC/288M NC/72M Document Number: 001-06366 Rev. *C Page 5 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Pin Definitions Pin Name D[x:0] IO Pin Description Data input signals. Sampled on the rising edge of K and K clocks during valid write operations. InputSynchronous CY7C1261V18 – D[7:0] CY7C1276V18 – D[8:0] CY7C1263V18 – D[17:0] CY7C1265V18 – D[35:0] InputWrite Port Select, Active LOW. Sampled on the rising edge of the K clock. When asserted Synchronous active, a write operation is initiated. Deasserting deselects the write port. Deselecting the write port causes D[x:0] to be ignored. InputNibble Write Select 0, 1, Active LOW (CY7C1261V18 Only). Sampled on the rising edge of Synchronous the K and K clocks when write operations are active. Used to select which nibble is written into the device during the current portion of the write operations. NWS0 controls D[3:0] and NWS1 controls D[7:4]. All the Nibble Write Selects are sampled on the same edge as the data. The corresponding nibble of data is ignored by deselecting a nibble write select and is not written into the device. Byte Write Select 0, 1, 2, and 3, Active LOW. Sampled on the rising edge of the K and K clocks InputSynchronous 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. CY7C1276V18 – BWS0 controls D[8:0] CY7C1263V18 – BWS0 controls D[8:0] and BWS1 controls D[17:9]. CY7C1265V18 – BWS0 controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3 controls D[35:27]. All the Byte Write Selects are sampled on the same edge as the data. Deselecting a Byte Write Select causes the corresponding byte of data to be ignored and not written into the device. A InputAddress Inputs. Sampled on the rising edge of the K clock during active read and write operaSynchronous tions. These address inputs are multiplexed for both read and write operations. Internally, the device is organized as 4M x 8 (4 arrays each of 1M x 8) for CY7C1261V18, 4M x 9 (4 arrays each of 1M x 9) for CY7C1276V18, 2M x 18 (4 arrays each of 512K x 18) for CY7C1263V18 and 1M x 36 (4 arrays each of 256K x 36) for CY7C1265V18. Therefore, only 20 address inputs are needed to access the entire memory array of CY7C1261V18 and CY7C1276V18, 19 address inputs for CY7C1263V18 and 18 address inputs for CY7C1265V18. These inputs are ignored when the appropriate port is deselected. OutputsData Output Signals. These pins drive out the requested data during a read operation. Valid Synchronous data is driven out on the rising edge of both the K and K clocks during read operations. When the read port is deselected, Q[x:0] are automatically tri-stated. CY7C1261V18 – Q[7:0] CY7C1276V18 – Q[8:0] CY7C1263V18 – Q[17:0] CY7C1265V18 – Q[35:0] InputRead Port Select, Active LOW. Sampled on the rising edge of Positive Input Clock (K). When Synchronous active, a read operation is initiated. Deasserting causes the read port to be deselected. When deselected, the pending access is allowed to complete and the output drivers are automatically tri-stated following the next rising edge of the K clock. Each read access consists of a burst of four sequential transfers. Valid Output Indicator InputClock InputClock Valid Output Indicator. The Q Valid indicates valid output data. QVLD is edge aligned with CQ and CQ. 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 clock 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. WPS NWS0, NWS1, BWS0, BWS1, BWS2, BWS3 Q[x:0] RPS QVLD K K Document Number: 001-06366 Rev. *C Page 6 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Pin Definitions (continued) Pin Name CQ IO Echo Clock Pin Description Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the QDR-II+. The timing for the echo clocks is shown in “Switching Characteristics” on page 23. Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input clock (K) of the QDR-II+. The timing for the echo clocks is shown in “Switching Characteristics” on page 23. Output Impedance Matching Input. This input is used to tune the device outputs to the system data bus impedance. CQ, CQ, and Q[x:0] output impedance are set to 0.2 x RQ, where RQ is a resistor connected between ZQ and ground. Alternatively, 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. DLL Turn Off, Active LOW. Connecting this pin to ground turns off the DLL inside the device. The timing in the DLL turned off operation is different from that listed in this data sheet. For normal operation, this pin can be connected to a pull up through a 10 Kohm or less pull up resistor. The device behaves in QDR-I mode when the DLL is turned off. In this mode, the device can be operated at a frequency of up to 167 MHz with QDR-I timing. TDO for JTAG. TCK pin for JTAG. TDI pin for JTAG. TMS pin for JTAG. Not connected to the die. Can be tied to any voltage level. Not connected to the die. Can be tied to any voltage level. Not connected to the die. Can be tied to any voltage level. Not connected to the die. Can be tied to any voltage level. Reference Voltage Input. Static input used to set the reference level for HSTL inputs, outputs, and AC measurement points. CQ Echo Clock ZQ Input DOFF Input TDO TCK TDI TMS NC NC/72M Output Input Input Input N/A N/A N/A N/A InputReference NC/144M NC/288M VREF VDD VSS VDDQ Power Supply Power supply inputs to the core of the device. Ground Ground for the device. Power Supply Power supply inputs for the outputs of the device. Document Number: 001-06366 Rev. *C Page 7 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Functional Overview The CY7C1261V18, CY7C1276V18, CY7C1263V18, and CY7C1265V18 are synchronous pipelined Burst SRAMs equipped with a read port and a write port. The read port is dedicated to read operations and the write port is dedicated to write operations. Data flows into the SRAM through the write port and out through the read port. These devices multiplex the address inputs to minimize the number of address pins required. By having separate read and write ports, the QDR-II+ completely eliminates the need to “turn around” the data bus and avoids any possible data contention, thereby simplifying system design. Each access consists of four 8-bit data transfers in the case of CY7C1261V18, four 9-bit data transfers in the case of CY7C1276V18, four 18-bit data transfers in the case of CY7C1263V18, and four 36-bit data transfers in the case of CY7C1265V18, in two clock cycles. Accesses for both ports are initiated on the Positive Input Clock (K). All synchronous input and output timing refer to the rising edge of the Input clocks (K/K). All synchronous data inputs (D[x:0]) inputs pass through input registers controlled by the input clocks (K and K). All synchronous data outputs (Q[x:0]) outputs pass through output registers controlled by the rising edge of the Input clocks (K and K). All synchronous control (RPS, WPS, BWS[x:0]) inputs pass through input registers controlled by the rising edge of the input clocks (K/K). CY7C1263V18 is described in the following sections. The same basic descriptions apply to CY7C1261V18, CY7C1276V18, and CY7C1265V18. Read Operations The CY7C1263V18 is organized internally as 4 arrays of 512K x 18. Accesses are completed in a burst of four sequential 18-bit data words. Read operations are initiated by asserting RPS active at the rising edge of the Positive Input Clock (K). The addresses presented to address inputs are stored in the Read address register. Following the next two K clock rising edges, the corresponding lowest order 18-bit word of data is driven onto the Q[17:0] using K as the output timing reference. On the subsequent rising edge of K the next 18-bit data word is driven onto the Q[17:0]. This process continues until all four 18-bit data words have been driven out onto Q[17:0]. The requested data is valid 0.45 ns from the rising edge of the Input clock (K or K). To maintain the internal logic, each read access must be allowed to complete. Each read access consists of four 18-bit data words and takes two clock cycles to complete. Therefore, read accesses to the device cannot be initiated on two consecutive K clock rises. The internal logic of the device ignores the second read request. Read accesses can be initiated on every other K clock rise. Doing so pipelines the data flow such that data is transferred out of the device on every rising edge of the input clocks (K and K). When the read port is deselected, the CY7C1263V18= completes the pending read transactions. Synchronous internal circuitry automatically tri-states the outputs following the next rising edge of the negative Input Clock (K). This enables a seamless transition between devices without the insertion of wait states in a depth expanded memory. Write Operations Write operations are initiated by asserting WPS active at the rising edge of the Positive Input Clock (K). On the following K clock rise, the data presented to D[17:0] is latched and stored into the lower 18-bit Write Data register, provided BWS[1:0] are both asserted active. On the subsequent rising edge of the Negative Input Clock (K), the information presented to D[17:0] is also stored into the Write Data register, provided BWS[1:0] are both asserted active. This process continues for one more cycle until four 18-bit words (a total of 72 bits) of data are stored in the SRAM. The 72 bits of data are then written into the memory array at the specified location. Therefore, write accesses to the device cannot be initiated on two consecutive K clock rises. The internal logic of the device ignores the second write request. Write accesses can be initiated on every other rising edge of the Positive Input Clock (K). Doing so pipelines the data flow such that 18 bits of data can be transferred into the device on every rising edge of the input clocks (K and K). When deselected, the write port ignores all inputs after the pending write operations have been completed. Byte Write Operations Byte write operations are supported by the CY7C1263V18. A write operation is initiated as described in the Write Operations section. The bytes that are written are determined by BWS0 and BWS1, which are sampled with each set of 18-bit data words. Asserting the appropriate Byte Write Select input during the data portion of a write enables the data being presented to be latched and written into the device. Deasserting the Byte Write Select input during the data portion of a write enables the data stored in the device for that byte to remain unaltered. This feature can be used to simplify read/modify/write operations to a byte write operation. Concurrent Transactions The read and write ports on the CY7C1263V18 operate completely independently of one another. Because each port latches the address inputs on different clock edges, the user can read or write to any location, regardless of the transaction on the other port. If the ports access the same location when a read follows a write in successive clock cycles, the SRAM delivers the most recent information associated with the specified address location. This includes forwarding data from a write cycle that was initiated on the previous K clock rise. Read accesses and write access must be scheduled such that one transaction is initiated on any clock cycle. If both ports are selected on the same K clock rise, the arbitration depends on the previous state of the SRAM. If both ports are deselected, the read port takes priority. If a read was initiated on the previous cycle, the Write port assumes priority (because read operations cannot be initiated on consecutive cycles). If a write was initiated on the previous cycle, the read port assumes priority (because write operations cannot be initiated on consecutive cycles). Therefore, asserting both port selects active from a deselected state results in alternating read/write operations being initiated, with the first access being a read. Depth Expansion The CY7C1263V18 has a Port Select input for each port. This enables easy depth expansion. Both Port Selects are sampled on the rising edge of the Positive Input Clock only (K). Each Page 8 of 28 Document Number: 001-06366 Rev. *C [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 port select input can deselect the specified port. Deselecting a port does not affect the other port. All pending transactions (read and write) are completed before the device is deselected. Programmable Impedance An external resistor, RQ, must be connected between the ZQ pin on the SRAM and VSS to enable the SRAM to adjust its output driver impedance. The value of RQ must be 5X the value of the intended line impedance driven by the SRAM. The allowable range of RQ to guarantee impedance matching with a tolerance of ±15% is between 175Ω and 350Ω, with VDDQ = 1.5V. The output impedance is adjusted every 1024 cycles upon power up to account for drifts in supply voltage and temperature. Echo Clocks Echo clocks are provided on the QDR-II+ to simplify data capture on high speed systems. Two echo clocks are generated by the QDR-II+. CQ is referenced with respect to K and CQ is referenced with respect to K. These are free running clocks and are synchronized to the input clock of the QDR-II+. The timing for the echo clocks is shown in “Switching Characteristics” on page 23. Valid Data Indicator (QVLD) QVLD is provided on the QDR-II+ to simplify data capture on high speed systems. The QVLD is generated by the QDR-II+ device along with data output. This signal is also edge aligned with the echo clock and follows the timing of any data pin. This signal is asserted half a cycle before valid data arrives. Delay Lock Loop (DLL) These chips use a DLL that is designed to function between 120 MHz and the specified maximum clock frequency. To disable the DLL, apply ground to the DOFF pin. When the DLL is turned off, the device behaves in QDR-I mode (with 1.0 cycle latency and a longer access time). For more information, refer to the application note, DLL Considerations in QDRII/DDRII/QDRII+/DDRII+. The DLL can also be reset by slowing or stopping the input clocks K and K for a minimum of 30 ns. However, it is not necessary for the DLL to be reset to lock to the frequency you want. During power up, when the DOFF is tied HIGH, the DLL is locked after 2048 cycles of stable clock. Document Number: 001-06366 Rev. *C Page 9 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Application Example Figure 1 shows the use of four QDR-II+ SRAMs in an application. Figure 1. Application Example ZQ CQ/CQ SRAM #1 Q D A RPS WPS BWS K K RQ = 250ohms D A ZQ CQ/CQ SRAM #4 Q RPS WPS BWS K K RQ = 250ohms Vt R DATA IN DATA OUT Address R R Vt Vt BUS MASTER RPS (CPU or ASIC) WPS BWS CLKIN/CLKIN Source K Source K R = 50ohms, Vt = VDDQ /2 Truth Table The truth table for the CY7C1261V18, CY7C1276V18, CY7C1263V18, and CY7C1265V18 follows.[2, 3, 4, 5, 6, 7] Operation K RPS WPS H [8] DQ DQ DQ DQ Write Cycle: L-H Load address on the rising edge of K; input write data on two consecutive K and K rising edges. Read Cycle: L-H (2.5 cycle Latency) Load address on the rising edge of K; wait two and half cycle; read data on two consecutive K and K rising edges. NOP: No Operation Standby: Clock Stopped L-H L[9] D(A) at K(t + 1) ↑ D(A + 1) at K(t +1) ↑ D(A + 2) at K(t + 2) ↑ D(A + 3) at K(t + 2) ↑ L[9] X Q(A) at K(t + 2) ↑ Q(A + 1) at K(t + 3) ↑ Q(A + 2) at K(t + 3) ↑ Q(A + 3) at K(t + 4) ↑ H H X D=X Q = High-Z Previous State D=X Q = High-Z Previous State D=X Q = High-Z Previous State D=X Q = High-Z Previous State Stopped X Notes 2. X = “Don't Care,” H = Logic HIGH, L = Logic LOW, ↑ represents rising edge. 3. Device powers up deselected with the outputs in a tri-state condition. 4. “A” represents address location latched by the devices when transaction was initiated. A + 1, A + 2, and A + 3 represent the address sequence in the burst. 5. “t” represents the cycle at which a read/write operation is started. t + 1, t + 2, t + 3 and t + 4 are the first, second, third, and fourth clock cycles, respectively, succeeding the “t” clock cycle. 6. Data inputs are registered at K and K rising edges. Data outputs are delivered on K and K rising edges. 7. Cypress recommends that K = K = HIGH when clock is stopped. This is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically. 8. If this signal was LOW to initiate the previous cycle, this signal becomes a “Don’t Care” for this operation. 9. This signal was HIGH on previous K clock rise. Initiating consecutive read or write operations on consecutive K clock rises is not permitted. The device will ignore the second read or write request. Document Number: 001-06366 Rev. *C Page 10 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Write Cycle Descriptions The write cycle descriptions table for CY7C1261V18 and CY7C1263V18 follows.[2, 10] BWS0/ BWS1/ NWS0 L NWS1 L K L–H K – Comments During the data portion of a write sequence : CY7C1261V18 − both nibbles (D[7:0]) are written into the device, CY7C1263V18 − both bytes (D[17:0]) are written into the device. L L – L-H During the data portion of a write sequence : CY7C1261V18 − both nibbles (D[7:0]) are written into the device, CY7C1263V18 − both bytes (D[17:0]) are written into the device. – During the data portion of a write sequence : CY7C1261V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered. CY7C1263V18 − only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered. L H L–H L H – L–H During the data portion of a write sequence : CY7C1261V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered. CY7C1263V18 − only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered. – During the data portion of a write sequence : CY7C1261V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered. CY7C1263V18 − only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered. H L L–H H L – L–H During the data portion of a write sequence : CY7C1261V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered. CY7C1263V18 − only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered. – No data is written into the devices during this portion of a write operation. L–H No data is written into the devices during this portion of a write operation. H H H H L–H – Write Cycle Descriptions The write cycle descriptions table for CY7C1276V18 follows.[2, 10] BWS0 L L H H K L–H – L–H – K – L–H – L–H Comments During the data portion of a write sequence, the single byte (D[8:0]) is written into the device. During the data portion of a write sequence, the single byte (D[8:0]) is written into the device. No data is written into the device during this portion of a write operation. No data is written into the device during this portion of a write operation. Note 10. Assumes a write cycle was initiated per the Write Cycle Descriptions table. NWS0, NWS1, BWS0, BWS1, BWS2, and BWS3 can be altered on different portions of a write cycle, as long as the setup and hold requirements are met. Document Number: 001-06366 Rev. *C Page 11 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Write Cycle Descriptions The write cycle descriptions table for CY7C1265V18 follows.[2, 10] BWS0 L L L L H H H H H H H H BWS1 L L H H L L H H H H H H BWS2 L L H H H H L L H H H H BWS3 L L H H H H H H L L H H K L–H – L–H – L–H – L–H – L–H – L–H – K – Comments During the data portion of a write sequence, all four bytes (D[35:0]) are written into the device. L–H During the data portion of a write sequence, all four bytes (D[35:0]) are written into the device. – During the data portion of a write sequence, only the lower byte (D[8:0]) is written into the device. D[35:9] remains unaltered. L–H During the data portion of a write sequence, only the lower byte (D[8:0]) is written into the device. D[35:9] remains unaltered. – During the data portion of a write sequence, only the byte (D[17:9]) is written into the device. D[8:0] and D[35:18] remain unaltered. L–H During the data portion of a write sequence, only the byte (D[17:9]) is written into the device. D[8:0] and D[35:18] remain unaltered. – During the data portion of a write sequence, only the byte (D[26:18]) is written into the device. D[17:0] and D[35:27] remain unaltered. L–H During the data portion of a write sequence, only the byte (D[26:18]) is written into the device. D[17:0] and D[35:27] remain unaltered. – During the data portion of a write sequence, only the byte (D[35:27]) is written into the device. D[26:0] remains unaltered. L–H During the data portion of a write sequence, only the byte (D[35:27]) is written into the device. D[26:0] remains unaltered. – No data is written into the device during this portion of a write operation. L–H No data is written into the device during this portion of a write operation. Document Number: 001-06366 Rev. *C Page 12 of 28 [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 IEEE 1149.1 Serial Boundary Scan (JTAG) These SRAMs incorporate a serial boundary scan test access port (TAP) in the FBGA package. This part is fully compliant with IEEE Standard #1149.1-2001. The TAP operates using JEDEC standard 1.8V IO logic levels. Disabling the JTAG Feature It is possible to operate the SRAM without using the JTAG feature. To disable the TAP controller, tie TCK LOW (VSS) to prevent device clocking. TDI and TMS are internally pulled up and may be unconnected. They may alternatively be connected to VDD through a pull up resistor. TDO must be left unconnected. Upon power up, the device comes up in a reset state, which does not interfere with the operation of the device. Test Access Port – Test Clock The test clock is used only with the TAP controller. All inputs are captured on the rising edge of TCK. All outputs are driven from the falling edge of TCK. Test Mode Select The TMS input is used to give commands to the TAP controller and is sampled on the rising edge of TCK. You can leave this pin unconnected if the TAP is not used. The pin is pulled up internally, resulting in a logic HIGH level. Test Data-In (TDI) The TDI pin is used to serially input information into the registers and can be connected to the input of any of the registers. The register between TDI and TDO is chosen by the instruction that is loaded into the TAP instruction register. For information on loading the instruction register, see the “TAP Controller State Diagram” on page 15. TDI is internally pulled up and can be unconnected if the TAP is unused in an application. TDI is connected to the most significant bit (MSB) on any register. Test Data-Out (TDO) The TDO output pin is used to serially clock data-out from the registers. Whether the output is active depends on the current state of the TAP state machine (see “Instruction Codes” on page 18). The output changes on the falling edge of TCK. TDO is connected to the least significant bit (LSB) of any register. Performing a TAP Reset A Reset is performed by forcing TMS HIGH (VDD) for five rising edges of TCK. This RESET does not affect the operation of the SRAM and may be performed while the SRAM is operating. At power up, the TAP is reset internally to ensure that TDO comes up in a high-Z state. TAP Registers Registers are connected between the TDI and TDO pins and enable data to be scanned into and out of the SRAM test circuitry. Only one register can be selected at a time through the instruction registers. Data is serially loaded into the TDI pin on the rising edge of TCK. Data is output on the TDO pin on the falling edge of TCK. Instruction Register Three-bit instructions can be serially loaded into the instruction register. This register is loaded when it is placed between the TDI and TDO pins as shown in “TAP Controller Block Diagram” on page 16. Upon power up, the instruction register is loaded with the IDCODE instruction. It is also loaded with the IDCODE instruction if the controller is placed in a reset state as described in the previous section. When the TAP controller is in the Capture IR state, the two least significant bits are loaded with a binary ‘01’ pattern to enable fault isolation of the board level serial test path. Bypass Register To save time when serially shifting data through registers, it is sometimes advantageous to skip certain chips. The bypass register is a single-bit register that can be placed between TDI and TDO pins. This enables data to be shifted through the SRAM with minimal delay. The bypass register is set LOW (VSS) when the BYPASS instruction is executed. Boundary Scan Register The boundary scan register is connected to all of the input and output pins on the SRAM. Several no connect (NC) pins are also included in the scan register to reserve pins for higher density devices. The boundary scan register is loaded with the contents of the RAM input and output ring when the TAP controller is in the Capture-DR state and is then placed between the TDI and TDO pins when the controller is moved to the Shift-DR state. The EXTEST, SAMPLE/PRELOAD, and SAMPLE Z instructions can be used to capture the contents of the input and output ring. “Boundary Scan Order” on page 19 shows the order in which the bits are connected. Each bit corresponds to one of the bumps on the SRAM package. The MSB of the register is connected to TDI, and the LSB is connected to TDO. Identification (ID) Register The ID register is loaded with a vendor-specific, 32-bit code during the Capture-DR state when the IDCODE command is loaded in the instruction register. The IDCODE is hardwired into the SRAM and can be shifted out when the TAP controller is in the Shift-DR state. The ID register has a vendor code and other information described in “Identification Register Definitions” on page 18. TAP Instruction Set Eight different instructions are possible with the three-bit instruction register. All combinations are listed in “Instruction Codes” on page 18. Three of these instructions are listed as RESERVED and must not be used. The other five instructions are described in this section in detail. Instructions are loaded into the TAP controller during the Shift-IR state when the instruction register is placed between TDI and TDO. During this state, instructions are shifted through the instruction register through the TDI and TDO pins. To execute the instruction after it is shifted in, the TAP controller must be moved into the Update-IR state. Document Number: 001-06366 Rev. *C Page 13 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 IDCODE The IDCODE instruction causes a vendor-specific, 32-bit code to be loaded into the instruction register. It also places the instruction register between the TDI and TDO pins and enables the IDCODE to be shifted out of the device when the TAP controller enters the Shift-DR state. The IDCODE instruction is loaded into the instruction register upon power-up or whenever the TAP controller is in a Test-Logic-Reset state. SAMPLE Z The SAMPLE Z instruction causes the boundary scan register to be connected between the TDI and TDO pins when the TAP controller is in a Shift-DR state. The SAMPLE Z command puts the output bus into a High-Z state until the next command is issued during the Update-IR state. SAMPLE/PRELOAD SAMPLE/PRELOAD is a 1149.1 mandatory instruction. When the SAMPLE/PRELOAD instructions are loaded into the instruction register and the TAP controller is in the Capture-DR state, a snapshot of data on the inputs and output pins is captured in the boundary scan register. Be aware that the TAP controller clock can only operate at a frequency up to 20 MHz, although the SRAM clock operates more than an order of magnitude faster. Because there is a large difference in the clock frequencies, it is possible that during the Capture-DR state, an input or output may undergo a transition. The TAP may then try to capture a signal while in transition (metastable state). This does not harm the device, but there is no guarantee as to the value that is captured. Repeatable results may not be possible. To guarantee that the boundary scan register captures the correct value of a signal, the SRAM signal must be stabilized long enough to meet the TAP controller's capture setup plus hold times (tCS and tCH). The SRAM clock input might not be captured correctly if there is no way in a design to stop (or slow) the clock during a SAMPLE/PRELOAD instruction. If this is an issue, it is still possible to capture all other signals and simply ignore the value of the CK and CK captured in the boundary scan register. After the data is captured, it is possible to shift out the data by putting the TAP into the Shift-DR state. This places the boundary scan register between the TDI and TDO pins. PRELOAD enables an initial data pattern to be placed at the latched parallel outputs of the boundary scan register cells before the selection of another boundary scan test operation. The shifting of data for the SAMPLE and PRELOAD phases can occur concurrently when required — that is, while data captured is shifted out, the preloaded data can be shifted in. BYPASS When the BYPASS instruction is loaded in the instruction register and the TAP is placed in a Shift-DR state, the bypass register is placed between the TDI and TDO pins. The advantage of the BYPASS instruction is that it shortens the boundary scan path when multiple devices are connected together on a board. EXTEST The EXTEST instruction enables the preloaded data to be driven out through the system output pins. This instruction also selects the boundary scan register to be connected for serial access between the TDI and TDO in the Shift-DR controller state. EXTEST OUTPUT BUS TRI-STATE IEEE Standard 1149.1 mandates that the TAP controller be able to put the output bus into a tri-state mode. The boundary scan register has a special bit located at bit #108. When this scan cell, called the “extest output bus tri-state,” is latched into the preload register during the Update-DR state in the TAP controller, it directly controls the state of the output (Q-bus) pins, when the EXTEST is entered as the current instruction. When HIGH, it enables the output buffers to drive the output bus. When LOW, this bit places the output bus into a High-Z condition. This bit can be set by entering the SAMPLE/PRELOAD or EXTEST command, and then shifting the desired bit into that cell, during the Shift-DR state. During Update-DR” the value loaded into that shift register cell latches into the preload register. When the EXTEST instruction is entered, this bit directly controls the output Q-bus pins. Note that this bit is preset HIGH to enable the output when the device is powered up, and also when the TAP controller is in the Test-Logic-Reset state. Reserved These instructions are not implemented but are reserved for future use. Do not use these instructions. Document Number: 001-06366 Rev. *C Page 14 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 TAP Controller State Diagram The state diagram for the TAP Controller follows.[11] 1 TEST-LOGIC RESET 0 1 0 TEST-LOGIC/ IDLE 1 SELECT DR-SCAN 0 1 CAPTURE-DR 0 SHIFT-DR 1 EXIT1-DR 0 PAUSE-DR 1 0 EXIT2-DR 1 UPDATE-DR 1 0 1 SELECT IR-SCAN 0 1 CAPTURE-IR 0 0 SHIFT-IR 1 0 1 EXIT1-IR 0 1 0 PAUSE-IR 1 0 EXIT2-IR 1 UPDATE-IR 1 0 0 Note 11. The 0/1 next to each state represents the value at TMS at the rising edge of TCK Document Number: 001-06366 Rev. *C Page 15 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 TAP Controller Block Diagram 0 Bypass Register TDI Selection Circuitry 2 Instruction Register 31 30 29 . . 2 1 0 1 0 Selection Circuitry TDO Identification Register 108 . . . . 2 1 0 Boundary Scan Register TCK TMS TAP Controller TAP Electrical Characteristics Over the Operating Range[12, 13, 14] Parameter VOH1 VOH2 VOL1 VOL2 VIH VIL IX Description Output HIGH Voltage Output HIGH Voltage Output LOW Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input and Output Load Current GND ≤ VI ≤ VDD Test Conditions IOH = −2.0 mA IOH = −100 µA IOL = 2.0 mA IOL = 100 µA –0.3 –5 Min 1.4 1.6 0.4 0.2 0.65VDD VDD + 0.3 0.35VDD 5 Max Unit V V V V V V µA Notes 12. These characteristics apply to the TAP inputs (TMS, TCK, TDI and TDO). Parallel load levels are specified in “Electrical Characteristics” on page 21. 13. Overshoot: VIH(AC) < VDDQ + 0.3V (pulse width less than tCYC/2). Undershoot: VIL(AC) > −0.3V (pulse width less than tCYC/2). 14. All voltage refer to Ground. Document Number: 001-06366 Rev. *C Page 16 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 TAP AC Switching Characteristics Over the Operating Range[15, 16] Parameter tTCYC tTF tTH tTL Setup Times tTMSS tTDIS tCS Hold Times tTMSH tTDIH tCH Output Times tTDOV tTDOX TCK Clock LOW to TDO Valid TCK Clock LOW to TDO Invalid 0 10 ns ns TMS Hold after TCK Clock Rise TDI Hold after Clock Rise Capture Hold after Clock Rise 5 5 5 ns ns ns TMS Setup to TCK Clock Rise TDI Setup to TCK Clock Rise Capture Setup to TCK Rise 5 5 5 ns ns ns TCK Clock Cycle Time TCK Clock Frequency TCK Clock HIGH TCK Clock LOW 20 20 Description Min 50 20 Max Unit ns MHz ns ns TAP Timing and Test Conditions[16] 0.9V 50Ω TDO Z0 = 50Ω 0V CL = 20 pF ALL INPUT PULSES 1.8V 0.9V (a) GND tTH tTL Test Clock TCK tTMSS tTMSH tTCYC Test Mode Select TMS tTDIS tTDIH Test Data In TDI Test Data Out TDO tTDOV tTDOX Notes 15. tCS and tCH refer to the setup and hold time requirements of latching data from the boundary scan register. 16. Test conditions are specified using the load in TAP AC test conditions. tR/tF = 1 ns. Document Number: 001-06366 Rev. *C Page 17 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Identification Register Definitions Instruction Field Revision Number (31:29) Cypress Device ID (28:12) Cypress JEDEC ID (11:1) ID Register Presence (0) Value CY7C1261V18 000 CY7C1276V18 000 CY7C1263V18 000 CY7C1265V18 000 Description Version number. 11010010001000111 11010010001001111 11010010001010111 11010010001100111 Defines the type of SRAM. 00000110100 00000110100 00000110100 00000110100 Enables unique identification of SRAM vendor. Indicates the presence of an ID register. 1 1 1 1 Scan Register Sizes Register Name Instruction Bypass ID Boundary Scan Bit Size 3 1 32 109 Instruction Codes Instruction EXTEST IDCODE SAMPLE Z RESERVED SAMPLE/PRELOAD RESERVED RESERVED BYPASS Code 000 001 010 011 100 101 110 111 Description Captures the input/output ring contents. Loads the ID register with the vendor ID code and places the register between TDI and TDO. This operation does not affect SRAM operation. Captures the input/output contents. Places the boundary scan register between TDI and TDO. Forces all SRAM output drivers to a High-Z state. Do Not Use: This instruction is reserved for future use. Captures the input/output ring contents. Places the boundary scan register between TDI and TDO. Does not affect the SRAM operation. Do Not Use: This instruction is reserved for future use. Do Not Use: This instruction is reserved for future use. Places the bypass register between TDI and TDO. This operation does not affect SRAM operation. Document Number: 001-06366 Rev. *C Page 18 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Boundary Scan Order Bit # 0 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 Bump ID 6R 6P 6N 7P 7N 7R 8R 8P 9R 11P 10P 10N 9P 10M 11N 9M 9N 11L 11M 9L 10L 11K 10K 9J 9K 10J 11J 11H Bit # 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Bump ID 10G 9G 11F 11G 9F 10F 11E 10E 10D 9E 10C 11D 9C 9D 11B 11C 9B 10B 11A 10A 9A 8B 7C 6C 8A 7A 7B 6B Bit # 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 Bump ID 6A 5B 5A 4A 5C 4B 3A 2A 1A 2B 3B 1C 1B 3D 3C 1D 2C 3E 2D 2E 1E 2F 3F 1G 1F 3G 2G 1H Bit # 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 Bump ID 1J 2J 3K 3J 2K 1K 2L 3L 1M 1L 3N 3M 1N 2M 3P 2N 2P 1P 3R 4R 4P 5P 5N 5R Internal Document Number: 001-06366 Rev. *C Page 19 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Power Up Sequence in QDR-II+ SRAM QDR-II+ SRAMs must be powered up and initialized in a predefined manner to prevent undefined operations. During power up, when the DOFF is tied HIGH, the DLL is locked after 2048 cycles of stable clock. DLL Constraints • DLL uses K clock as its synchronizing input. The input must have low phase jitter, which is specified as tKC Var. • The DLL functions at frequencies down to 120 MHz. • If the input clock is unstable and the DLL is enabled, then the DLL may lock onto an incorrect frequency, causing unstable SRAM behavior. To avoid this, provide 2048 cycles stable clock to relock to the clock frequency you want. Power Up Sequence • Apply power with DOFF tied HIGH (All other inputs can be HIGH or LOW) — Apply VDD before VDDQ — Apply VDDQ before VREF or at the same time as VREF • Provide stable power and clock (K, K) for 2048 cycles to lock the DLL Power Up Waveforms Figure 2. Power Up Waveforms K K ~ ~ Unstable Clock > 2048 Stable Clock Start Normal Operation Clock Start (Clock Starts after VDD/VDDQ is Stable) VDD/VDDQ VDD/VDDQ Stable (< + 0.1V DC per 50 ns) Fix HIGH (tie to VDDQ) DOFF Document Number: 001-06366 Rev. *C ~ ~ Page 20 of 28 [+] [+] Feedback CY7C1261V18 CY7C1276V18 CY7C1263V18 CY7C1265V18 Maximum Ratings Exceeding maximum ratings may shorten the battery life of the device. User guidelines are not tested. Storage Temperature ................................ –65°C to + 150°C Ambient Temperature with Power Applied . –55°C to + 125°C Supply Voltage on VDD Relative to GND....... –0.5V to + 2.9V Supply Voltage on VDDQ Relative to GND ..... –0.5V to + VDD DC Applied to Outputs in High-Z .........–0.5V to VDDQ + 0.3V DC Input Voltage[13] ...............................–0.5V to VDD + 0.3V Current into Outputs (LOW)......................................... 20 mA Static Discharge Voltage (MIL-STD-883, M. 3015)... >2001V Latch up Current..................................................... >200 mA Operating Range Range Com’l Ind’l Ambient Temperature (TA) 0°C to +70°C –40°C to +85°C VDD[17] 1.8 ± 0.1V VDDQ[17] 1.4V to VDD Electrical Characteristics Over the Operating Range[14] DC Electrical Characteristics Parameter VDD VDDQ VOH VOL VOH(LOW) VOL(LOW) VIH VIL IX IOZ VREF IDD Description Power Supply Voltage I/O Supply Voltage Output HIGH Voltage Output LOW Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input Leakage Current Output Leakage Current Input Reference Voltage[20] VDD Operating Supply GND ≤ VI ≤ VDDQ GND ≤ VI ≤ VDDQ, Output Disabled Typical Value = 0.75V VDD = Max., IOUT = 0mA, f = fMAX = 1/tCYC 300 MHz 333 MHz 375 MHz 400 MHz ISB1 Automatic Power-down Current Max. VDD, Both Ports Deselected, VIN ≥ VIH or VIN ≤ VIL f = fMAX = 1/tCYC, Inputs Static 300 MHz 333 MHz 375 MHz 400 MHz Note 18 Note 19 IOH = −0.1 mA, Nominal Impedance IOL = 0.1 mA, Nominal Impedance Test Conditions Min 1.7 1.4 VDDQ/2 – 0.12 VDDQ/2 – 0.12 VDDQ – 0.2 VSS VREF + 0.1 –0.15 −2 −2 0.68 0.75 Typ 1.8 1.5 Max 1.9 VDD VDDQ/2 + 0.12 VDDQ/2 + 0.12 VDDQ 0.2 VDDQ + 0.15 VREF – 0.1 2 2 0.95 1040 1120 1240 1330 280 300 310 320 Unit V V V V V V V V µA µA V mA mA mA mA mA mA mA mA AC Electrical Characteristics Over the Operating Range [13] Parameter VIH VIL Description Input HIGH Voltage Input LOW Voltage Test Conditions Min. VREF + 0.2 –0.24 Typ. – – Max. VDDQ + 0.24 VREF – 0.2 Unit V V Notes 17. Power up: assumes a linear ramp from 0V to VDD(min) within 200 ms. During this time VIH < VDD and VDDQ < VDD. 18. Outputs are impedance controlled. IOH = −(VDDQ/2)/(RQ/5) for values of 175Ω