SSRAM Austin Semiconductor, Inc. 256K x 18 SSRAM PIN ASSIGNMENT (Top View) Synchronous Burst SRAM, Flow-Through SA SA CE\ CE2 NC MARKING -8* -9 -10 SA NC NC VDDQ V SS NC DQPa DQa DQa V SS VDDQ DQa DQa V SS NC VDD ZZ DQa DQa VDDQ V SS DQa DQa NC NC V SS VDDQ NC NC NC **pins 42,43 reserved for future address expansion for 8Mb, 16Mb densities. DQ No. 1001 CE2), burst control inputs (ADSC\, ADSP\, ADV\), byte write enables (BWx\) and global write (GW\). Asynchronous inputs include the output enable (OE\), clock (CLK) and snooze enable (ZZ). There is also a burst mode input (MODE) that selects between interleaved and linear burst modes. The data-out (Q), enabled by OE\, is also asynchronous. WRITE cycles can be from one to two bytes wide, as controlled by the write control inputs. Burst operation can be initiated with either address status processor (ADSP\) or address status controller (ADSC\) inputs. Subsequent burst addresses can be internally generated as controlled by the burst advance input (ADV\). Address and write control are registered on-chip to simplify WRITE cycles. This allows self-timed WRITE cycles. Individual byte enables allow individual bytes to be written. During WRITE cycles on this x18 device BWa\ controls DQa pins and DQPa; BWb\ controls DQb pins and DQPb. GW\ LOW causes all bytes to be written. Parity bits are available on this device. ASI’s 4Mb Synchronous Burst SRAMs operate from a +3.3V VDD power supply, and all inputs and outputs are TTL-compatible. The device is ideally suited for 486, Pentium®, and PowerPC systems and those systems that benefit from a wide synchronous data bus. IT XT *available as IT only. For more products and information please visit our web site at www.austinsemiconductor.com GENERAL DESCRIPTION The Austin Semiconductor, Inc. Synchronous Burst SRAM family employs high-speed, low power CMOS designs that are fabricated using an advanced CMOS process. ASI’s 4Mb Synchronous Burst SRAMs integrate a 256K x 18, SRAM core with advanced synchronous peripheral circuitry and a 2-bit burst counter. All synchronous inputs pass through registers controlled by a positive-edge-triggered single clock input (CLK). The synchronous inputs include all addresses, all data inputs, active LOW chip enable (CE\), two additional chip enables for easy depth expansion (CE2\, AS5SS256K18 Rev. 2.1 06/05 1 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 2 79 3 78 4 77 5 76 6 75 7 74 8 73 9 72 10 71 11 70 12 69 13 68 14 67 15 66 16 65 17 64 18 63 19 62 20 61 21 60 22 59 23 58 24 57 25 56 26 55 27 54 28 53 29 52 30 51 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 MODE SA SA SA SA • Timing 7.5ns/8ns/113 MHz 8.5ns/10ns/100 MHz 10ns/15ns/66 MHz • Packages 100-pin TQFP • Operating Temperature Ranges: - Military -55oC to +125oC - Industrial -45oC to +85oC NC NC NC VDDQ V SS NC NC DQb DQb V SS VDDQ DQb DQb V SS VDD NC V SS DQb DQb VDDQ V SS DQb DQb DQPb NC V SS VDDQ NC NC NC SA1 SA0 DNU DNU VSS VDD NF** NF** SA SA SA SA SA SA SA • Fast access times: 8, 10, and 15ns • Fast clock speed: 113, 100, and 66 MHz • Fast clock and OE\ access times • Single +3.3V +0.3V/-0.165V power supply (VDD) • SNOOZE MODE for reduced-power standby • Common data inputs and data outputs • Individual BYTE WRTIE control and GLOBAL WRITE • Three chip enables for simple depth expansion and address pipelining • Clock-controlled and registered addresses, data I/Os and control signals • Interally self-timed WRITE cycle • Burst control pin (interleaved or linear burst) • Automatic power-down • Low capacitive bus loading • Operating Temperature Ranges: - Military -55oC to +125oC - Industrial -40oC to +85oC NC bwB\ BWa\ CE2\ VDD V SS CLK GW\ BWE\ OE\ ADSC\ ADSP\ ADV\ SA SA 100-pin TQFP FEATURES OPTIONS AS5SS256K18 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 1 SSRAM Austin Semiconductor, Inc. AS5SS256K18 PIN DESCRIPTIONS PIN NUMBERS SYM TYPE DESCRIPTION 37, 36, 32-35, 44-50, 80-82, 99, 100 93, 94 SA0, SA1, SA BWa\ BWb\ Input 87 BWE\ Input 88 GW\ Input 89 CLK Input 98 CE\ Input 92 CE2\ Input Synchronous Address Inputs: These inputs are registered and must meet the setup and hold times around the rising edge of CLK. Synchronous Byte Write Enables: These active LOW inputs allow individual bytes to be written and must meet the setup and hold times around the rising edge of CLK. A byte write enables is LOW for a WRITE cycle and HIGH for a READ cycle. BWa\ controls DQa pins and DQPa; BWb\ controls DQb pins and DQPb. Byte Write Enable: This active LOW input permits BYTE WRITE operations and must meet the setup and hold times around the rising edge of CLK. Global Write: This active LOW input allows a full 18-bit WRITE to occur independent of the BWE\ and BWx\ lines and must meet the setup and hold times around the rising edge of CLK. Clock: This signal registers the addresses, data, chip enables, byte write enables and burst control inputs on its rising edge. All synchronous inputs must meet setup and hold times around the clock’s rising edge. Synchronous Chip Enable: This active LOW input is used to enable the device and Conditions the internal use of ADSP\. CE\ is sampled only when a new external address is loaded. Synchronous Chip Enable: This active LOW input is used to enable the device and is sampled only when a new external address is loaded. 97 CE2 Input Synchronous Chip Enable: This active HIGH input is used to enable the device and is sampled only when a new external address is loaded. 86 OE\ Input Output Enable: This active LOW, asynchronous input enables the data I/O output drivers. 83 ADV\ Input 84 ADSP\ Input 85 ADSC\ Input 31 MODE Input 64 ZZ Input (a) 58, 59, 62, 63, 68, 69, 72, 73 (b) 8, 9, 12,13, 18, 19, 22, 23 74, 24 DQa DQb Input/ Output Synchronous Address Advance: This active LOW input is used to advance the internal burst counter, controlling burst access after the external address is loaded. A HIGH on this pin effectively causes wait states to be generated (no address advance). To ensure use of correct address during WRITE cycle, ADV\ must be HIGH at the rising edge of the first clock after an ADSP\ cycle is initiated. Synchronous Address Status Processor: This active LOW input interrupts any ongoing burst, causing a new external address to be registered. A READ is performed using the new address, independent of the byte write enables and ADSC\, but dependent upon CE\, CE2, and CE2\. ADSP\ is ignored if CE\ is HIGH. Power-down state is entered if CE2 if LOW or CE2\ is HIGH. Synchronous Address Status Controller: This active LOW input interrupts any ongoing burst, causing a new external address to be registered. A READ or WRITE is performed using the new address if CE\ is LOW. ADSC\ is also used to place the chip into powerdown state when CE\ is HIGH. Mode: This input selects the burst sequence. A LOW on this pin selects LINEAR BURST. A NC or HIGH on this pin selects INTERLEAVED BURST. Do not alter input state while device is operating. Snooze Enable: This active HIGH, asynchronous input causes the device to enter a lowpower standby mode in which all data in the memory array is retained. When ZZ is active, all other inputs are ignored. SRAM Data I/Os: Byte "a" is DQa pins; Byte "b" is DQb pins. Input data must meet setup and hold times around the rising edge of CLK. NC/DQPa NC/DQPb NC/ I/O No Connect/Parity Data I/Os: Byte "a" is DQPa pins; Byte "b" is DQPb pins. 15, 41,65, 91 VDD Supply Power Supply: See DC Electrical Characteristics and Operating Conditions for range. 4, 11, 20, 27, 54, 61, 70, 77 VDDQ Supply Isolated Output Buffer Supply: See DC Electrical Characterics and Operating Conditions for range. 5, 10, 14, 17, 21, 26, 40, 55, 60, 67 71, 76, 90 38, 39 VSS Supply Ground: GND DNU --- 1-3, 6, 7, 16,25, 28-30, 51-53, 56,57, 66, 75, 78, 79, 95, 96 NC ----- 42, 43 NF AS5SS256K18 Rev. 2.1 06/05 Input Do Not Use: These signals may either be unconnected or wired to GND to improve package heat dissipation. No Connect: These signals are not internally connected and may be connected to ground to improve package heat dissipation. No Function: These pins are internally connected to the die and will have the capacitance of input pins. It is allowable to leave these pins unconnected or driven by signals. Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 2 SSRAM AS5SS256K18 Austin Semiconductor, Inc. INTERLEAVED BURST ADDRESS TABLE (MODE=NC OR HIGH) FIRST ADDRESS (EXTERNAL) SECOND ADDRESS (INTERNAL) THIRD ADDRESS (INTERNAL) FOURTH ADDRESS (INTERNAL) X…X00 X…X01 X…X10 X…X11 X…X01 X…X00 X…X11 X…X10 X…X10 X…X11 X…X00 X…X01 X…X11 X…X10 X…X01 X…X00 LINEAR BURST ADDRESS TABLE (MODE=LOW) FIRST ADDRESS (EXTERNAL) SECOND ADDRESS (INTERNAL) THIRD ADDRESS (INTERNAL) FOURTH ADDRESS (INTERNAL) X…X00 X…X01 X…X10 X…X11 X…X01 X…X10 X…X11 X…X00 X…X10 X…X11 X…X00 X…X01 X…X11 X…X00 X…X01 X…X10 PARTIAL TRUTH TABLE FOR WRITE COMMANDS FUNCTION READ READ WRITE Byte "a" WRITE Byte "b" WRITE All Bytes WRITE All Bytes GW\ H H H H H L BWE\ H L L L L X BWa\ X H L H L X BWb\ X H H L L X NOTE: Using BWE\ and BWa\ through BWb\, any one or more bytes may be written. FUNCTIONAL BLOCK DIAGRAM 18 SA0, SA1, SA MODE ADV\ CLK 18 ADDRESS REGISTER 16 2 Q1 BINARY COUNTER AND LOGIC Q0 CLR 18 SA0-SA1 SA1' SA0' ADSC\ ADSP\ BWb\ 9 BYTE "b" WRITE REGISTER 9 BWa\ BWE\ GW\ CE\ CE2 CE2\ OE\ BYTE "a" WRITE REGISTER BYTE "b" WRITE DRIVER BYTE "a" WRITE DRIVER 9 9 256K x 9 x 2 MEMORY ARRAY 18 SENSE AMPS 18 OUTPUT BUFFERS 18 DQs DQPa DQPb INPUT REGISTERS 18 ENABLE REGISTER 2 NOTE: The Functional Block Diagram illustrates simplified device operation. See Truth Table, pin descriptions and timing diagrams for detailed information. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 3 SSRAM AS5SS256K18 Austin Semiconductor, Inc. TRUTH TABLE OPERATION DESELECT Cycle, Power-Down DESELECT Cycle, Power-Down DESELECT Cycle, Power-Down DESELECT Cycle, Power-Down DESELECT Cycle, Power-Down SNOOZE MODE, Power-Down READ Cycle, Begin Burst READ Cycle, Begin Burst WRITE Cycle, Begin Burst READ Cycle, Begin Burst READ Cycle, Begin Burst READ Cycle, Continue Burst READ Cycle, Continue Burst READ Cycle, Continue Burst READ Cycle, Continue Burst WRITE Cycle, Continue Burst WRITE Cycle, Continue Burst READ Cycle, Suspend Burst READ Cycle, Suspend Burst READ Cycle, Suspend Burst READ Cycle, Suspend Burst WRITE Cycle, Suspend Burst WRITE Cycle, Suspend Burst ADDRESS USED NONE NONE NONE NONE NONE NONE EXTERNAL EXTERNAL EXTERNAL EXTERNAL EXTERNAL NEXT NEXT NEXT NEXT NEXT NEXT CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT CE\ CE2\ CE2 ZZ ADSP\ ADSC\ ADV\ WRITE\ OE\ CLK H L L L L X L L L L L X X H H X H X X H H X H X X H X H X L L L L L X X X X X X X X X X X X X L X L X X H H H H H X X X X X X X X X X X X L L L L L H L L L L L L L L L L L L L L L L L X L L H H X L L H H H H H X X H X H H X X H X L X X L L X X X L L L H H H H H H H H H H H H X X X X X X X X X X X L L L L L L H H H H H H X X X X X X X X L H H H H H H L L H H H H L L X X X X X X L H X L H L H L H X X L H L H X X L-H L-H L-H L-H L-H X L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H L-H DQ High-Z High-Z High-Z High-Z High-Z High-Z Q High-Z D Q High-Z Q High-Z Q High-Z D D Q High-Z Q High-Z D D NOTES: 1. X means “Don’t Care.” \ means active LOW. H means logic HIGH. L means logic LOW. 2. For WRITE\, L means any one or more byte write enable signals (BWa\, BWb\) and BWE\ are LOW or GW\ is LOW. WRITE\ = H for all BWx\, BWE\, GW\ HIGH. 3. BWa\ enables WRITEs to DQas and DQPa. BWb\ enables WRITEs to DQbs and DQPb. 4. All inputs except OE\ and ZZ must meet setup and hold times around the rising edge (LOW to HIGH) of CLK. 5. Wait states are inserted by suspending burst. 6. For a WRITE operation following a READ operation, OE\ must be HIGH before the input data setup time and held HIGH throughout the input data hold time. 7. This device contains circuitry that will ensure the outputs will be in High-Z during power-up. 8. ADSP\ LOW always initiates an internal READ at the L-H edge of CLK. A WRITE is performed by setting one or more byte write enable signals and BWE\ LOW or GW\ LOW for the subsequent L-H edge of CLK. Refer to WRITE timing diagram for clarification. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 4 SSRAM AS5SS256K18 Austin Semiconductor, Inc. ABSOLUTE MAXIMUM RATINGS* *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. **Maximum junction temperature depends upon package type, cycle time, loading, ambient temperature and airflow. Voltage on VDD Supply Relative to VSS............-0.5V to +4.6V Voltage on VDDQ Supply Relative to VSS.........-0.5V to +4.6V Storage Temperature (plastic) .....................-55°C to +125°C Max Junction Temperature**.......................................+150°C Short Circuit Output Current..........…...........................100mA DC ELECTRICAL CHARACTERISTICS AND RECOMMENDED OPERATING CONDITIONS (-55oC < TA < +125oC and -40oC<TA<+85oC; VDD = +3.3V +0.3V/-0.165V unless otherwise noted) DESCRIPTION Input High (Logic 1) Voltage Input Low (Logic 0) Voltage CONDITIONS SYMBOL VIH VIL MIN 2.0 -0.3 MAX VDD +0.3 0.8 UNITS V V NOTES 1, 2 1, 2 Input Leakage Current (0V<VIN<VDD) ILI -2 2 µΑ 3 Output(s) disabled; 0V<VIN<VDD ILO -2 2 µΑ VOH VOL VDD VDDQ 2.4 -3.135 3.135 -0.5 3.6 3.6 V V V V CI MAX 4 UNITS pF NOTES 6 TA = 25°C; f = 1MHz; CO 5 pF 6 VDD = 3.3V CA 3.5 pF 6 CCK 3.5 pF 6 CONDITIONS SYM TYP UNITS NOTES Test conditions follow standard test methods and procedures for measuring thermal impedance, per EIA/JESD51 θJA 46 °C/W 6 θJC 2.8 °C/W 6 Output Leakage Current IOH = -4.0mA IOL = 8.0 mA Output High Voltage Output Low Voltage Supply Voltage Isolated Output Buffer Supply 1, 4 1, 4 1 1, 5 CAPACITANCE DESCRIPTION Control Input Capacitance CONDITIONS Input/Output Capacitance (DQ) Address Capacitance SYM Clock Capacitance THERMAL RESISTANCE DESCRIPTION Thermal Resistance (Junction to Ambient) Thermal Resistance (Junction to Top of Case) NOTES: 1. All voltages referenced to VSS (GND) 2. Overshoot: VIH < +4.6V for t < tKC/2 for I < 20mA Undershoot: VIL > -0.7V for t < tKC/2 for I < 20mA Power-up: VIH < +3.6V and VDD<3.135V for t < 200ms 3. MODE pin has an internal pull-up, and input leakage = ±10µA. 4. The load used for VOH, VOL testing is shown in Figure 2 for 3.3V I/O. AC load current is higher then the stated DC values. 5. VDDQ should never exceed VDD. VDD and VDDQ can be connected together, for 3.3V I/O operation only. 6. This parameter is sampled. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 5 SSRAM AS5SS256K18 Austin Semiconductor, Inc. IDD ELECTRICAL CHARACTERISTICS AND RECOMMENDED OPERATING CONDITIONS (-55oC < TA < +125oC and -40oC<TA<+85oC; VDD = +3.3V +0.3V/-0.165V unless otherwise noted) PARAMETER CONDITIONS Power Supply Current: Operating Device selected; all inputs < VIL or > VIH; Cycle time > tKC (MIN); VDD = MAX; Outputs Open Power Supply Current: Idle ADV\, GW\, BWx\ > VIH; All inputs < VSS +0.2 or SYM -8 MAX -9 -10 IDD 375 325 250 mA 2, 3, 4 IDD1 100 85 65 mA 2, 3, 4 ISB2 10 10 10 mA 3, 4 ISB3 25 25 25 mA 3, 4 ISB4 100 85 65 mA 3, 4 UNITS NOTES Device selected; VDD = MAX; ADSC\, ADSP\, t > VDDQ -0.2; Cycle time > KC (MIN); Outputs Open Device deselected; VDD = MAX; CMOS Standby TTL Standby All inputs < Vss +0.2 or > VDDQ -0.2; All inputs static; CLK frequency =0 Device deselected; VDD = MAX; All inputs < VIL or > VIH; All inputs static; CLK frequency = 0 Device deselected; VDD = MAX; Clock Running ASDP\, ADV\, GW\, BWx\ > VIH; All inputs < VSS +0.2 or > VDDQ -0.2; t Cycle time > KC (MIN) NOTES: 1. VDDQ = +3.3V +0.3V/-0.165V for 3.3V I/O configuration. 2. IDD is specified with no output current and increases with faster cycle times. IDDQ increases with faster cycle times and greater output loading. 3. “Device deselected” means device is in power-down mode as defined in the truth table. “Device selected” means device is active (not in power-down mode). 4. Typical values are measured at 3.3V, 25°C and 15ns cycle time. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 6 SSRAM AS5SS256K18 Austin Semiconductor, Inc. ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS (Note 1) -55oC < TA < +125oC and -40oC<TA<+85oC; VDD = +3.3V +0.3V/-0.165V unless otherwise noted) DESCRIPTION SYMBOL -8 MIN -9 MAX MIN -10 MAX MIN MAX UNITS NOTES CLOCK Clock cycle time tKC 8.8 10 15 ns Clock frequency tKF Clock HIGH time tKH 2.5 3.0 4.0 ns 2 Clock LOW time tKL 2.5 3.0 4.0 ns 2 113 100 66 MHz OUTPUT TIMES Clock to output valid tKQ Clock to output invalid tKQX 1.5 3.0 3.0 ns 3 Clock to output in Low-Z tKQLZ 1.5 3.0 3.0 ns 3, 4, 5 Clock to output in High-Z tKQHZ 4.2 5.0 5.0 ns 3, 4, 5 OE\ to output valid tOEQ 4.2 5.0 5.0 ns 6 ns 3, 4, 5 ns 3, 4, 5 OE\ to output in Low-Z tOELZ OE\ to output in High-Z SETUP TIMES tOEHZ 7.5 0 8.5 0 4.2 10 0 5.0 5.0 ns tAS 1.5 1.8 2.0 ns 7, 8 Address status (ADSC\, ADSP\) tADSS 1.5 1.8 2.0 ns 7, 8 Address advance (ADV\) tAAS 1.5 1.8 2.0 ns 7, 8 Byte write enables (BWa\-BWb\, GW\, BWE\) tWS 1.5 1.8 2.0 ns 7, 8 Data-in tDS 1.5 1.8 2.0 ns 7, 8 Chip enable (CE\) HOLD TIMES tCES 1.5 1.8 2.0 ns 7, 8 Address tAH 0.5 0.5 0.5 ns 7, 8 Address status (ADSC\, ADSP\) tADSH 0.5 0.5 0.5 ns 7, 8 Address advance (ADV\) tAAH 0.5 0.5 0.5 ns 7, 8 Byte write enables (BWa\-BWb\, GW\, BWE\) tWH 0.5 0.5 0.5 ns 7, 8 Data-in tDH 0.5 0.5 0.5 ns 7, 8 Chip enable (CE\) tCEH 0.5 0.5 0.5 ns 7, 8 Address NOTES: 1. Test conditions as specified with the output loading shown in Figure 1 for 3.3V I/O (VDDQ = +3.3V +0.3V/-0.165V) unless otherwise noted. 2. Measured as HIGH above VIH and LOW below VIL. 3. This parameter is measured with the output loading shown in Figure 2 for 3.3V I/O. 4. This parameter is sampled. 5. Transition is measured ±500mV from steady state voltage. 6. OE\ is a “Don’t Care” when a byte write enable is sampled LOW. 7. A READ cycle is defined by byte write enables all HIGH or ADSP\ LOW for the required setup and hold times. A WRITE cycle is defined by at least one byte write enable LOW and ADSP\ HIGH for the required setup and hold times. 8. This is a synchronous device. All addresses must meet the specified setup and hold times for all rising edges of CLK when either ADSP\ or ADSC\ is LOW and chip enabled. All other synchronous inputs must meet the setup and hold times with stable logic levels for all rising edges of clock (CLK) when the chip is enabled. Chip enable must be valid at each rising edge of CLK when either ADSP\ or ADSC\ is LOW to remain enabled. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 7 SSRAM AS5SS256K18 Austin Semiconductor, Inc. AC TEST CONDITIONS OUTPUT LOADS VIH = (VDD/2.2) + 1.5V Input pulse levels VIL = (VDD/2.2) - 1.5V 1ns VDD/2.2 Input rise and fall times Input timing reference levels Output reference levels Output load DQ Z 0=50Ω 50Ω VDDQ/2.2 See Figures 1 and 2 Vt = 1.5V Fig. 1 OUTPUT LOAD EQUIVALENT LOAD DERATING CURVES ASI’s 256K x 18 Synchronous Burst SRAM timing is dependent upon the capacitive loading on the outputs. 3.3v SNOOZE MODE 317Ω SNOOZE MODE is a low-current, “power-down” mode in which the device is deselected and current is reduced to ISB2Z. The duration of SNOOZE MODE is dictated by the length of time ZZ is in a HIGH state. After the device enters SNOOZE MODE, all inputs except ZZ become gated inputs and are ignored. ZZ is an asynchronous, active HIGH input that causes the device to enter SNOOZE MODE. When ZZ becomes a logic HIGH, ISB2Z is DQ 5 pF 351Ω guaranteed after the setup time tZZ is met. Any READ or WRITE operation pending when the device enters SNOOZE MODE is not quaranteed to complete successfully. Therefore, SNOOZE MODE must not be initiated until valid pending operations are completed. Fig. 2 OUTPUT LOAD EQUIVALENT SNOOZE MODE ELECTRICAL CHARACTERISTICS DESCRIPTION Current during SNOOZE MODE CONDITIONS SYM ZZ > VIH MIN UNITS mA NOTES ISB2Z MAX 10 ZZ active to input ignored tZZ tKC ns 1 ZZ inactive to input sampled tRZZ ns 1 ZZ active to snooze current tZZI ns 1 ZZ inactive to exit snooze current tRZZI ns 1 tKC tKC 0 NOTE: 1. This parameter is sampled. SNOOZE MODE WAVEFORM CLK t RZZ t ZZ ZZ ISUPPLY ALL INPUTS* * Except ZZ AS5SS256K18 Rev. 2.1 06/05 t ZZI ISB2 t RZZI 12345 11234567890 12345 12 12345 11234567890 12345 12 12345 1234567890 1 12345 12 12345 11234567890 12345 12 1234 1234 1234Don’t Care 1234 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 8 SSRAM AS5SS256K18 Austin Semiconductor, Inc. READ TIMING t KC tKL ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Burst wraps around to its initial state. ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ BURST READ tKQHZ 123 12 123 12 Q(A2) 123 123 Q(A2+1) 12 12 Q(A2+2) ○ 12 12 12 12 Q(A2+3) 12 12 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Q(A2+2) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456789012 123456 1 123456789012 123456 1 123456789012 1 123456789012 1123456 123456 123456789012 1 123456789012 1123456 123456 123456789012 123456 ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 123456 123456 ADV\ suspends burst. ○ ○ ○ ○ ○ ○ (NOTE 1) ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tOELZ tKQ t KQX 123 1234 12 12 123 1234 12 123 123 Q(A2)1234 1234 Q(A2+1) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ Q(A1) SINGLE READ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 12345 12345 12345 12345 12345 12345 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ tKQ tOEHZ ○ ○ ○ ○ ○ ○ ○ ○ High-Z ○ Q 1234 1234 1234 1234 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tOEQ ○ ○ tKQLZ Deselect Cycle ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ tAAS tAAH 123456 1234567890123456 1234567890123456 1234567890123456 1234567890123456 1234567890123456 1234567890123456 ○ ○ ○ ○ OE\ 123456 123456 123456 123456 123456 123456 123456 123456789012345678901234567890121234567890123456789012345678901212345678901234567 123456789012345678901234567890121234567890123456789012345678901212345678901234567 123456789012345678901234567890121234567890123456789012345678901212345678901234567 123456789012345678901234567890121234567890123456789012345678901212345678901234567 123456789012345678901234567890121234567890123456789012345678901212345678901234567 123456789012345678901234567890121234567890123456789012345678901212345678901234567 ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 12345 12345 12345 12345 12345 12345 ○ ○ 123456 123456 123456 123456 123456 123456 123456 12345678 12 12345678901234567890123456789012123456789012345678901234567890121234567890123456789 12345678 12 12345678901234567890123456789012123456789012345678901234567890121234567890123456789 12345678 12 12345678 1212345678901234567890123456789012123456789012345678901234567890121234567890123456789 12345678901234567890123456789012123456789012345678901234567890121234567890123456789 12345678 12 12345678901234567890123456789012123456789012345678901234567890121234567890123456789 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ 12345 12345 12345 12345 12345 12345 12345 ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 tADSH (Note 4) 12345678 12 12345678901234567890123456789012123456789012345678901234567890121234567890123456789 ○ ○ 1234567890123456789012 123456 12 1234567890123456789012 123456 12 1234567890123456789012 123456 12 1234567890123456789012 123456 12 123456 12 1234567890123456789012 ADV\ 1234567890123456789012 123456 12 1234567890123456789012 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 t CES CEH t WS t WH 1234567 1234567890123 1 12345 123456789 12345 1234567 1234567890123 12345 123456789 12345 123456789 12345 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ 1234567890123456789012 123456 12 1234567890123456789012 123456 12 11 1234567890123 CE\ 1234567 1234567 1234567890123 11 1234567 1234567890123 1234567 1234567890123 (Note 2) 1234567 1 1234567890123 1234567 1234567 1234567 1234567 1234567 1234567 1234567 A2 ○ ○ ○ ○ ○ tAH 123456 12 BWE\, GW\, 1234567890123456789012 1234567890123456789012 123456 12 1234567890123456789012 123456 12 123456 12 BWa\-BWb\ 1234567890123456789012 t 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ t ADSS 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ A1 ○ 123456 123456 123456 123456 123456 123456 123456 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 ○ t AS ○ ○ 12345678 12345678 12 12345678 12345678 12 12345678 12345678 12 12345678 12 ADDRESS 12345678 12345678 12345678 12 12345678 12345678 12 ○ ○ ○ ○ ○ ○ ○ ○ tADSH 1234 123456789 12345 1234 1234 123456789 12345 1234 123456789 1234 12345 1234 123456789 1234 12345 1234 123456789 1234 12345 1234 1234 123456789 12345 1234 1234 12345 ○ 12345 12345 12345 ADSC\ 12345 12345 12345 tKH ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ 1234567 1234567 1234567 1234567 1234567 ○ ○ ○ t ADSS 1234567 ○ 12345 12345 12345 ADSP\ 12345 12345 12345 ○ ○ ○ ○ ○ ○ ○ CLK READ TIMING PARAMETERS -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 8.8 10 15 ns tKC 113 tKF MHz tADSS 1.5 1.8 2.0 ns 2.5 3.0 4.0 ns tAAS 1.5 1.8 2.0 ns tKL 2.5 3.0 4.0 ns tWS 1.5 1.8 2.0 ns ns tCES 1.5 1.8 2.0 ns 7.5 8.5 10 tKQX 1.5 3.0 3.0 ns tAH 0.5 0.5 0.5 ns tKQLZ 1.5 3.0 3.0 ns tADSH 0.5 0.5 0.5 ns 5.0 ns tAAH 0.5 0.5 0.5 ns 5.0 ns tWH 0.5 0.5 0.5 ns ns tCEH 0.5 0.5 0.5 ns 4.2 tKQHZ tOELZ tOEHZ 5.0 4.2 tOEQ 1. 2. 3. 4. 66 tKH tKQ NOTE: 100 -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 1.5 1.8 2.0 ns tAS 0 5.0 0 4.2 0 5.0 5.0 ns Q(A2) referes to output from address A2. Q(A2+1) refers to output from the next internal burst address following A2. CE2\ and CE2 have timing identical to CE\. On this diagram, when CE\ is LOW, CE2\ is LOW and CE2 is HIGH. When CE\ is HIGH, CE2\ is HIGH and CE2 is LOW. Timing is shown assuming that the device was not enabled before entering into this sequence. Outputs are disabled tKQHZ after deselect. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 9 SSRAM AS5SS256K18 Austin Semiconductor, Inc. t KC tKL WRITE TIMING ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 123456789 123456789 123456789 123456789 123456789 123456789 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456789 123456789 123456789 123456789 123456789 123456789 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tAAS t AAH 123456 12345 1234 123456789 1234 123456 1234 12345 123456789 1234 123456 1234 12345 1234 123456789 123456 1234 12345 123456789 1234 123456 1234123456789 12345 1234 123456 1234 12345 123456789 1234 123456 ○ ○ ○ 1234567 1234567890123456789012345 12 1234567 1234567890123456789012345 12 1234567890123456789012345 1234567 12 1234567 12 1234567890123456789012345 1234567 1234567890123456789012345 12 1234567 12 1234567890123456789012345 1234567 1234567890123456789012345 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234567 1234567 1234567 1234567 1234567 1234567 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ t WH ○ ○ ○ t WS 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ 12345678 123456789012345678901 12 123456789012345678901 12345678 12 123456789012345678901 12345678 12 12345678 123456789012345678901 12 12345678 123456789012345678901 12 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ A3 ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 tADSH 12345678 123456789012345678901 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ADV\ suspends burst. ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ (Note 3) tDS t DH ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 123456789 1234567890123456789012345678901212345678901234567890123456789012123456789012 12345 ○ ○ 1234567 1234567 1234567 1234567 1234567 1234567 1234567 ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ t WH ○ ○ ○ ○ ○ t WS 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 12 Q 12 12 -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 8.8 10 15 ns tKC NOTE: ○ ○ Extended BURST WRITE BURST WRITE 12345 12345 12345 12345Don’t WRITE TIMING PARAMETERS 113 100 MHz tCES 1.5 1.8 2.0 ns 2.5 3.0 4.0 ns tAH 0.5 0.5 0.5 ns tKL 2.5 3.0 4.0 ns tADSH 0.5 0.5 0.5 ns ns tAAH 0.5 0.5 0.5 ns 4.2 66 5.0 5.0 Care -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 1.5 1.8 2.0 ns tDS tKH tOEHZ ○ (Note 1) SINGLE WRITE tKF 12 12 12 12 12 12 D(A3+1) 12 D(A3+2) 12 12 ○ ○ D(A3) ○ ○ ○ ○ 12 12 12 12 D(A2+3) 12 12 ○ 123 123 12 D(A2+1) 12 D(A2+1) 123 D(A2+2) ○ 12 12 ○ ○ ○ ○ t OEHZ 12 12 12 BURST READ ○ ○ High-Z ○ ○ ○ 1234 12 123456 12345 12 12 12 123456 12345 12 12 1234 12 12345 12 123456 D(A1) 1234 D(A2) 12 ○ D ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ (Note 4) ○ 123456 123456 123456 123456 123456 123456 123456 12345 1234567890123456789012345678901212345678901234567890 12345 12345 1234567890123456789012345678901212345678901234567890 12345 1234567890123456789012345678901212345678901234567890 12345 12345 12345 12345 1234567890123456789012345678901212345678901234567890 12345 1234567890123456789012345678901212345678901234567890 12345 12345 12345 1234567890123456789012345678901212345678901234567890 12345 1234567890123456789012345678901212345678901234567890 12345 12345 1234 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 12345 12345 1234 1234567890 1234 12345 1234567890 12345 1234 1234 12345 12345 1234 1234567890 1234 12345 1234567890 12345 1234 ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ADSC\ extends burst. t 123456 123456 123456 ADSS 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 ○ OE\ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ CES CEH 123456 123456789012 12 1234 1234567890 12345 1234 123456 123456789012 12 1234 1234567890 12345 123456 1234567890 1234 123456789012 12 1234 12345 123456789012 12 1234 12345 1234 123456 1234567890 1234 123456 123456789012 12 1234 1234567890 12345 1234 123456789012 12 1234 12345 123456 1234567890 1234 123456 123456789012 1234 1234567890 12345 12345 12345 12345 12345 ADV\ 12345 12345 (Note 5) 12345 1234 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 12345 12345 1234 1234567890 1234 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 ○ ○ t 123456 123456 123456 123456 123456 123456 123456 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 123456789 12345 12345 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t 123456 123456 123456 123456 123456 123456 123456 123456 BYTE WRITE signals are ignored when ADSP\ is12345 LOW. 1234 123456789 1234 123456789 12345 1234 123456789 12345 1234 123456789 12345 1234 123456789 12345 123456789 1234 12345 ○ ○ ○ ○ ○ ○ ○ 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 12345 123456789 12345 123456789 12345 12345 123456789 12345 ○ CE\ (NOTE 2) ○ ○ ○ ○ ○ ○ ○ ○ ○ t ○ ○ ○ ○ ○ ○ ○ AH 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 123456 123456 123456 123456 123456 123456 123456 12345678 1234567890123456789012345678901212345678901234 12 12345678 1 12345678 1234567890123456789012345678901212345678901234 12 12345678 1 1234567890123456789012345678901212345678901234 12345678 12 12345678 1 1234567890123456789012345678901212345678901234 12345678 12 12345678 1 12345678 1234567890123456789012345678901212345678901234 12 12345678 1 12345678 1234567890123456789012345678901212345678901234 12 12345678 1 A2 ○ ○ ○ ○ A1 ○ 1234 1234 1234 GW\ 1234 1234 1234 ○ ○ ○ ○ ○ 1234 1234567890 1234 1234 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234567890 1234 12345 12345 1234 1234 12345 1234567890 12345 1234 1234 1234 12345 1234567890 12345 1234 12345 1234567890 12345 12345678 12345678 123 12345678 12345678 123 123 12345678 12345678 123 12345678 12345678 12345678 12345678 123 12345678 12345678 123 ○ 1234 1234 BEW\, 1234 1234 1234 BWa\ - BWb\ 1234 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ tAS tKH ○ ○ ○ ○ ○ ○ ○ tADSH 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 123456789 12345 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 1234567 12345678 12 1234567 12345678 12 1234567 12345678 12 1234567 12345678 12 ADDRESS 1234567 12345678 12 1234567 12345678 12 ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ tADSS 123456 ○ 1234 1234 1234 1234 ADSC\ 1234 1234 1234 ○ ○ 1234 1234 1234 ADSP\ 1234 1234 1234 ○ ○ ○ CLK tAS 1.5 1.8 2.0 ns tWH 0.5 0.5 0.5 ns tADSS 1.5 1.8 2.0 ns tDH 0.5 0.5 0.5 ns tAAS 1.5 1.8 2.0 ns tCEH 0.5 0.5 0.5 ns tWS 1.5 1.8 2.0 ns 1. D(A2) refers to output from address A2. D(A2+1) refres to output from the next internal burst address following A2. 2. CE2\ and CE2 have timing identical to CE\. On this diagram, when CE\ is LOW, CE2\ is LOW and CE2 is HIGH. When CE\ is HIGH, CE2\ is HIGH and CE2 is LOW. 3. OE\ must be HIGH before the input data setup and held HIGH throughout the data hold time. This prevents input/output data contention for the time period prior to the byte write enable inputs being sampled. 4. ADV\ must be HIGH to permit a WRITE to the loaded address. 5. Full-width WRITE can be initiated by GW\ LOW; or GW\ HIGH and BWE\, BWa\ and BWb\ LOW. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 10 SSRAM AS5SS256K18 Austin Semiconductor, Inc. READ/WRITE TIMING6 tKC tKL ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 12345 12345 12345 12345 12345 12345 12345 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 12345 12345 12345 12345 12345 12345 12345 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tOELZ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tDS tDH ○ ○ ○ ○ OE\ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 ○ ○ ○ ○ 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ tCEH 12345678901234567890123456789012123456789012 123456 12 12345678901234567890123456789012123456789012 123456 12 123456 12 12345678901234567890123456789012123456789012 123456 12 12345678901234567890123456789012123456789012 ADV\ 12345678901234567890123456789012123456789012 123456 12 123456 12 12345678901234567890123456789012123456789012 ○ 12345 1234567890123456789012345678901212345678 1234 12345 1234567890123456789012345678901212345678 1234 1234 12345 1234567890123456789012345678901212345678 1234 1234 12345 1234 1234567890123456789012345678901212345678 1234 12345 1234567890123456789012345678901212345678 1234 1234 12345 1234567890123456789012345678901212345678 1234 1234 12345 1234567890123456789012345678901212345678 1234 1234 ○ t WH 1234 12345 1234 123456789 1234 12345 123456789 1234 1234 12345 123456789 1234 1234 12345 1234 123456789 1234 12345 123456789 1234 1234123456789 12345 1234 123456789 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 123456789 12345 12345 12345 123456789 12345 123456789 12345 12345 ○ ○ ○ CES 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ A6 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123 123 123 123 123 123 A5 ○ ○ 1234567890123 1234567890123 1234567890123 1234567890123 1234567890123 1234567890123 ○ 123456789012345 123456789012345 123456789012345 123456789012345 123456789012345 123456789012345 ○ ○ ○ ○ A4 ○ ○ ○ t WS ○ ○ 12345678 12345678901234567890123456789012123 12 12345678 1 12345678 12345678901234567890123456789012123 12 12345678 1 12345678 12 12345678 1 12345678901234567890123456789012123 12345678 12 12345678 1 12345678901234567890123456789012123 12345678 12345678901234567890123456789012123 12 12345678 1 12345678 12 12345678 1 12345678901234567890123456789012123 ○ ○ ○ ○ ○ 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 A3 ○ ○ ○ ○ ○ ○ ○ ○ t ○ ○ ○ ○ CE\ (Note 2) 123456 123456 123456 123456 123456 123456 123456 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 ○ ○ ○ ○ t 123456 123456 123456 123456 123456 123456 123456 ○ A2 AH 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 ○ ○ ○ BWE\, GW\ BWa\ - BWb\ tKH ○ ○ ○ ○ ○ ○ ○ t AS ○ ○ ○ A1 ○ ADDRESS 123456 123456 123456 123456 123456 123456 ○ ○ ○ 123 123 123 123 123 123 tADSH 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ 12345 12345 12345 ADSC\ 12345 12345 12345 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ t ADSS 123456 123456 123456 123456 123456 123456 123456 ○ 12345 12345 12345 12345 ADSP\ 12345 12345 ○ CLK Q D(A3) tOEHZ 1234 123 1234 123 1234 1234 Q(A1) 123 123 Q(A2) Back-to-Back READS (NOTE 5) D(A5) ○ High-Z ○ D 11 11 tKQ Q(A4) SINGLE WRITE (NOTE 1)12 12 12 12 Q(A4+1) 12 12 113 66 Care 12345 12345 12345 Undefined 12345 12345 -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 1.5 1.8 2.0 ns tWS MHz tDS 1.5 1.8 2.0 ns tKH 2.5 3.0 4.0 ns tCES 1.5 1.8 2.0 ns tKL 2.5 3.0 4.0 ns tAH 0.5 0.5 0.5 ns ns tADSH 0.5 0.5 0.5 ns ns tWH 0.5 0.5 0.5 ns ns tDH 0.5 0.5 0.5 ns tCEH 0.5 0.5 0.5 ns 7.5 tKQ tOELZ 0 8.5 0 3.5 tOEHZ NOTE: 100 Back-to-Back WRITE’s 123456 123456 123456Don’t 123456 123456 -8 -9 -10 SYM MIN MAX MIN MAX MIN MAX UNITS 8.8 10 15 ns tKC 10 0 4.2 5.0 tAS 1.5 1.8 2.0 ns tADSS 1.5 1.8 2.0 ns D(A6) Q(A4+3) BURST READ READ/WRITE PARAMETERS tKF Q(A4+2) 12 12 12 1. Q(A4) refers to output from address A4. Q(A4+1) refers to output from the next internal burst address following A4. 2. CE2\ and CE2 have timing identical to CE\. On this diagram, when CE\ is LOW, CE2\ is LOW and CE2 is HIGH. When CE\ is HIGH, CE2\ is HIGH and CE2 is LOW. 3. The data bus (Q) remains in High-Z following a WRITE cycle unless an ADSP\, ADSC\, or ADV\ cycle is performed. 4. GW\ is HIGH. 5. Back-to-back READs may be controlled by either ADSP\ or ADSC\. 6. Timing is shown assuming that the device was not enabled before entering into this sequence. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 11 SSRAM AS5SS256K18 Austin Semiconductor, Inc. MECHANICAL DEFINITIONS ASI Case #1001 (Package Designator DQ) 16.00 +0.20/-0.05 14.00 + 0.10 Pin #1 ID 20.10 + 0.10 22.10 + 0.10/-0.15 DETAIL A 0.25 Gage Plane 0.10 +0.10/-0.05 1.00 TYP 0.62 See Detail A 1.40 + 0.05 0.10 0.15 +0.03/-0.02 1.50 + 0.10 NOTE: 0.32 +0.06/-0.10 0.65 0.60 + 0.15 1. All dimensions in Millimeters (MAX/MIN) or typical where noted. 2. Package width and length do not include mold protrusion; allowable mold protursion is 0.25mm per side. AS5SS256K18 Rev. 2.1 06/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 12 SSRAM Austin Semiconductor, Inc. AS5SS256K18 ORDERING INFORMATION EXAMPLE: AS5SS256K18DQ-8/IT Device Number AS5SS256K18 AS5SS256K18 AS5SS256K18 Package Speed ns Process Type DQ -8 IT only DQ -9 /* DQ -10 /* *AVAILABLE PROCESSES IT = Industrial Temperature Range XT = Extended Temperature Range AS5SS256K18 Rev. 2.1 06/05 -40oC to +85oC -55oC to +125oC Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 13