SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. 256K x 36 SSRAM PIN ASSIGNMENT (Top View) Flow-Through, Synchronous Burst SRAM 100-pin TQFP (DQ) (2-chip enable version, “A” indicator) FEATURES ! ! ! ! ! ! ! ! ! ! ! OPTIONS MARKING DQ No. 1001 100-pin TQFP (DQ) (3-chip enable version, no indicator) SA SA ADV\ ADSP\ ADSC\ OE\ BWE\ GW\ CLK Vss VDD CE2\ BWa\ BWb\ BWc\ BWd\ CE2 CE\ SA SA A (PRELIMINARY) no indicator XT* IT GENERAL DESCRIPTION The AS5SS256K36 employs high-speed, low-power CMOS designs that are fabricated using an advanced CMOS process. This 8Mb Synchronous Burst SRAM integrates a 256K x 36 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\, CE2), burst control inputs (ADSC\, ADSP\, ADV\), byte write enables (BWx\) and global write (GW\). Note that CE2\ is not available on the A version. 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 DQPb DQb DQb VDDQ Vss DQb DQb DQb DQb Vss VDDQ DQb DQb Vss NC VDD ZZ DQa DQa VDDQ Vss DQa DQa DQa DQa Vss VDDQ DQa DQa DQPa SA SA SA SA SA SA SA SA NF VDD Vss DNU DNU SA0 SA1 SA SA SA SA MODE For more products and information please visit our web site at www.austinsemiconductor.com 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 DQPc DQc DQc VDD Q Vss DQc DQc DQc DQc Vss VDD Q DQc DQc Vss V DD NC Vss DQd DQd VDD Q Vss DQd DQd DQd DQd Vss VDD Q DQd DQd DQPd *NOTE: -8.5/XT combination not available. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 DQPb DQb DQb V DDQ Vss DQb DQb DQb DQb Vss V DDQ DQb DQb Vss NC V DD ZZ DQa DQa V DDQ Vss DQa DQa DQa DQa Vss VDDQ DQa DQa DQPa SA SA SA SA SA SA SA NF NF VDD Vss DNU DNU SA0 SA1 SA SA SA SA MODE -8.5* -10 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Timing 8.5ns/10ns/100MHz 10ns/15ns/66MHz ! Packages 100-pin TQFP (2-chip enable) ! Pinout 2-chip Enables 3-chip Enables ! Operating Temperature Ranges Military (-55oC to +125oC) Industrial (-40oC to +85oC) ! 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 DQPc DQc DQc VDDQ Vss DQc DQc DQc DQc Vss VDDQ DQc DQc Vss VDD NC Vss DQd DQd VDDQ Vss DQd DQd DQd DQd Vss VDDQ DQd DQd DQPd 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ! Organized 256K x 36 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 WRITE 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 Internally self-timed WRITE cycle Burst control (interleaved or linear burst) Automatic power-down for portable applications 100-lead TQFP package for high density, high speed Low capacitive bus loading SA SA ADV\ ADSP\ ADSC\ OE\ BWE\ GW\ CLK Vss VDD SA BWa\ BWb\ BWc\ BWd\ CE2 CE\ SA SA ! Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 1 SSRAM Austin Semiconductor, Inc. AS5SS256K36 & AS5SS256K36A simplify WRITE cycles. This allows self-timed WRITE cycles. Individual byte enables allow individual bytes to be written. During WRITE cycles on the x18 device, BWa\ controls DQa’s and DQPa; BWb\ controls DQb’s and DQPb; BWc\ controls DQc’s and DQPc; BWd\ controls DQd’s and DQPd. GW\ LOW causes all bytes to be written. Parity bits are also featured on this device. This 8Mb Synchronous Burst SRAM operates from a +3.3V VDD power supply, and all inputs and outputs are TTLcompatible. The device is ideally suited for 486, Pentium©, 680x0 and PowerPCTM systems and those systems that benefit from a wide synchronous data bus. GENERAL DESCRIPTION (continued) 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 four 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 FUNCTIONAL BLOCK DIAGRAM 18 SA0, SA1, SAs MODE ADV\ CLK 18 ADDRESS REGISTER 16 18 SA0-SA1 Q1 BINARY COUNTER AND LOGIC CL SA1' Q0 SA0' ADSC\ ADSP\ BWd\ BYTE "d" WRITE REGISTER BYTE "d" WRITE DRIVER BWc\ BYTE "c" WRITE REGISTER BYTE "c" WRITE DRIVER BWb\ BYTE "b" WRITE REGISTER BYTE "b" WRITE DRIVER BWa\ BWE\ GW\ BYTE "a" WRITE REGISTER BYTE "a" WRITE DRIVER CE\ CE2 CE2\ OE\ 256K x 9 x 4 (x36) MEMORY ARRAY DQs SENSE AMPS DQPa OUTPUT BUFFERS DQPb DQPc DQPd INPUT REGISTERS ENABLE REGISTER 4 NOTE: Functional Block Diagrams illustrate simplified device operation. See Truth Table, Pin Descriptions and time diagrams for detailed information. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 2 SSRAM Austin Semiconductor, Inc. AS5SS256K36 & AS5SS256K36A PIN DESCRIPTION Pin Number SYMBOL TYPE DESCRIPTION 37 36 32-35, 44-50, SA0 Synchronous Address Inputs: These inputs are registered and must 81, 82, 99, SA1 Input meet the setup and hold times around the rising edge of CLK. Two 100 SA different pinouts are available for the TQFP packages. 92 (A version) 43 (3 CE version) Synchronous Byte Write Enables: These active LOW inputs allow individual bytes to be written and must meet the setup and hold times BWa\ 93 around the rising edge of CLK. A byte write enable is LOW for a WRITE 94 BWb\ Input cycle and HIGH for a READ cycle. Bwa\ controls DQa pins and DQPa; 95 BWc\ Bwb\ controls DQb pins and DQPb; Bwc\ controls DQc pins and DQPc; BWd\ 96 Bwd\ controls DQd pins and DQPd. Parity bits are featured on this device. Byte Write Enable: This active LOW input permits BYTE WRITE 87 BWE\ Input operations and must meet the setup and hold items around the rising edge of CLK. Global Write: This active LOW input allows a full 36-bit WRITE to occur 88 GW\ Input independent of the BWE\ and BWx\ lines and must meet the setup and hold times around the rising edge of CLK. Clock: CLK registers address, data, chip enable, byte write enables and 89 CLK Input 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 98 CE\ Input 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 92 CE2\ Input device and is sampled only when a new external address is loaded. (3 CE version) CE2\ is only available on the 3 CE version. 97 CE2 86 OE\ 83 ADV\ 85 ADSC\ AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 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. Output Enable: This active LOW, asynchronous input enables the data I/O output drivers. 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 Input states to be generated (no address advance). To ensure use of correct address during a WRITE cycle, ADV\ must be HIGH at the rising edge of the first clock after an ADSP\ cycle is initiated. Synchronous Address Status Controller: This active LOW input interrupts any ongoing burst, causing a new external address to be Input registered. A READ or WRITE is performed using the new address if CE\ is LOW. ADSC\ is also used to place the chip into power-down state when CE\ is HIGH. Input Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 3 SSRAM Austin Semiconductor, Inc. AS5SS256K36 & AS5SS256K36A PIN DESCRIPTION (continued) Pin Number SYMBOL TYPE 84 ASDP\ 31 MODE 64 ZZ (a) 52, 53, 56-59, 62, 63 (b) 68, 69, 72-75, 78, 79 (c) 2, 3, 6-9, 12, 13 (d) 18, 19, 22-25, 28, 29 51 80 1 30 DQa DQb DQc DQd DESCRIPTION Synchronous Address Status Processor: This active LOW inputs interrupts any ongoing burst, causing a new external address to be registered. A READ is performed using the new address, independent of Input 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 is LOW or CE2\ is HIGH. MODE: This inputs selects the burst sequence. A LOW on this pin Input select "linear burst." 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 low-power standby mode in which all data in the Input memory array is retained. When ZZ is active, all other inputs are ignored. SRAM Data I/O's: Byte "a" is DQa pins; Byte "b" is DQb pins; Byte "c" is Input/ DQc pins; Byte "d" is DQd pins. Input data must meet setup and hold Output times around the rising edge of CLK. NC/DQPa NC/DQPb Parity Data I/Os: Byte "a" parity is DQPa; Byte "b" parity is DQPb; Byte NC/ I/O NC/DQPc "c" parity is DQPc; Byte "d" parity is DQPd. NC/DQPd Power Supply: See DC Electrical Characteristics and Operating Supply 15, 41, 65, 91 VDD Conditions for range. Isolated Output Buffer Supply: See DC Electrical Characteristics and 4, 11, 20, 27, 54, VDDQ Supply Operating Conditions for range. 61, 70, 77 5, 10, 14, 17, 21, 26, 40, 55, 60, 67, Vss Supply Ground: GND 71, 76, 90 Do Not Use: These signals may either be unconnected or wired to GND 38, 39 DNU --to improve package heat dissipation. No Connect: These signals are not internally connected and may be 16, 66 NC --connected to GND to improve package heat dissipation. No Function: These pins are internally connected to the die and have 42 the capacitance of an input pin. It is allowable to leave these pins NF --43 (A version) unconnected or driven by signals. On the 3 CE version, pin 42 is reserved as an address upgrade pin for the 16Mb Synchronous Burst. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 4 SSRAM AS5SS256K36 & AS5SS256K36A 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 All Bytes WRITE All Bytes AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 GW\ H H H H L BWE\ H L L L X BWa\ X H L L X BWb\ X H H L X BWc\ X H H L X BWd\ X H H L X Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 5 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. TRUTH TABLE OPERATION Deselected Cycle, Power-Down Deselected Cycle, Power-Down Deselected Cycle, Power-Down Deselected Cycle, Power-Down Deselected 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 CE\ CE2\ CE2 USED None H X X None L X L None L H X None L X L None L H X None X X X External L L H External L L H External L L H External L L H External L L H Next X X X Next X X X Next H X X Next H X X Next X X X Next H X X Current X X X Current X X X Current H X X Current H X X Current X X X Current H X X ZZ L L L L L H L L L L L L L L L L L L L L L L L ADSP\ ADSC\ 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 ADV\ WRITE\ 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 OE\ CLK 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 NOTE: 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\, BWc\, or BWd\) and BWE\ are LOW or GW\ is LOW. WRITE\ = H for all BWx\, BWE\, GW\ HIGH. 3. BWa\ enables WRITEs to DQa pins, DQPa. BWb\ enables WRITEs to DQb pins, DQPb. BWc\ enables WRITEs to DQc pins, DQPc. BWd\ enables WRITEs to DQd pins, DQPd. 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 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. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 6 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. ABSOLUTE MAXIMUM RATINGS* Storage Temperature (Plastics) ...........................-55°C to +150°C Storage Temperature (Ceramics) .........................-55°C to +125°C Short Circuit Output Current (per I/O)…............................100mA Voltage on any Pin Relative to Vss........................-0.5V to +4.6 V Max Junction Temperature**..............................................+150°C VIN (DQx) .........................................................-0.5V to VDDQ +0.5V VIN (inputs) ................................................... ....-0.5V to VDD +0.5V *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 operation section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ** Junction temperature depends upon package type, cycle time, loading, ambient temperature and airflow, and humidity. 3.3V I/O DC ELECTRICAL CHARACTERISTICS AND OPERATING CONDITIONS (-55oC to +125oC or -40oC to +85oC; VDD, VDDQ = +3.3V +0.3V/-0.165V unless otherwise noted) PARAMETER Input High (Logic 1) Voltage Input Low (Logic 0) Voltage Input Leakage Current Output Leakage Current Output High Voltage Output Low Voltage Supply Voltage CONDITION OV < VIN < Vcc Output(s) disabled, OV < VOUT < Vcc IOH = -4.0 mA IOL = 8.0 mA Isolated Output Buffer Supply SYMBOL VIH VIL ILI ILO VOH VOL VDD VDDQ MIN 2.2 -0.3 -2 -2 2.4 --3.135 3.135 MAX VCC +0.3 0.8 2 2 -0.4 3.6 3.6 UNITS V V µΑ µΑ V V V V NOTES 1, 2 1, 2 3 1, 4 1, 4 1 1, 5 THERMAL RESISTANCE DESCRIPTION SYM TYP θJA 40 o 6 Thermal Resistance θJC 9 o 6 Thermal Resistance (Junction to Pins, Bottom) θJB 17 o 6 CONDITIONS Thermal Resistance (Junction to Ambient) 1-layer Test conditions follow standard test methods and procedures for measuring (Junction to Top of Case, Top) thermal impedance, per EIA/JESD51. UNITS NOTES C/W C/W C/W 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 and ZZ pins have internal pull-up resistors, 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 than the stated DC values. AC I/O curves are available upon request. 5. VDDQ should never exceed VDD. VDD and VDDQ can be connected together. 6. This parameter is sampled. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 7 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. IDD OPERATING CONDITIONS AND MAXIMUM LIMITS (-55oC to +125oC or -40oC to +85oC) $%& %&' ! "# ! "# " () %) $ "*) "*) "*) +,*) -,.* " / '0% 1'0% 2& 3& " () %) $ (& (& " %) $ $' $' " %) $ 2& 3& " %) $ ! "# " /'0% 1'0% " 56 78 ! ' 4 ! "# " " 56 78 ! ' 995 4 ! "# : ; "*) "*) "*) +,*) -,.* " /'0% 1'0% CAPACITANCE DESCRIPTION Control Input Capacitance Input/Output Capacitance (DQ) Address Capacitance CONDITIONS SYM CI MAX 4 UNITS pF NOTES 4 o TA = 25 C; f = 1MHz; VDD = 3.3V CO 5 pF 4 CA 3.5 pF 4 CCK 3.5 pF 4 Clock Capacitance NOTES: 1. IDD is specified with no output current and increases with faster cycle times. IDDQ increases with faster cycle times and greater output loading. 2. “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). 3. A typical value is measured at 3.3V, 25oC and 15ns cycle time. 4. This parameter is sampled. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 8 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS (Note 1) (-55oC to +125oC or -40oC to +85oC) DESCRIPTION SYMBOL -8.5 MIN MAX MIN -10 MAX UNITS NOTES CLOCK Clock cycle time tKC Clock frequency tKF Clock HIGH time tKH 3.0 4.0 ns 2 Clock LOW time OUTPUT TIMES Clock to output valid tKL 3.0 4.0 ns 2 tKQ Clock to output invalid tKQX 3.0 3.0 ns 3 Clock to output in Low-Z tKQLZ 3.0 3.0 ns 3, 4, 5, 6, Clock to output in High-Z tKQHZ 5.0 5.0 ns 3, 4, 5, 6, OE\ to output valid tOEQ 5.0 5.0 ns 7 OE\ to output in Low-Z tOELZ ns 3, 4, 5, 6, OE\ to output in High-Z SETUP TIMES Address tOEHZ ns 3, 4, 5, 6, tAS 1.8 2.0 ns 8, 9 Address status (ADSC\, ADSP\) tADSS 1.8 2.0 ns 8, 9 Address advance (ADV\) tAAS 1.8 2.0 ns 8, 9 Byte write enables (BWa\ - BWd\, GW\, BWE\) tWS 1.8 2.0 ns 8, 9 Data-in tDS 1.8 2.0 ns 8, 9 Chip enable (CE\) HOLD TIMES Address tCES 1.8 2.0 ns 8, 9 tAH 0.5 0.5 ns 8, 9 Address status (ADSC\, ADSP\) tADSH 0.5 0.5 ns 8, 9 Address advance (ADV\) tAAH 0.5 0.5 ns 8, 9 Byte write enables (BWa\ - BWd\, GW\, BWE\) tWH 0.5 0.5 ns 8, 9 Data-in tDH 0.5 0.5 ns 8, 9 Chip enable (CE\) tCEH 0.5 0.5 ns 8, 9 10.0 15.0 100 8.5 0 ns 66 10.0 0 5.0 5.0 MHz ns NOTE: 1. 2. 3. 4. 5. 6. 7. 8. at 9. Test conditions as specified with the output loading shown in Figure 1 unless otherwise noted. Measured as HIGH above VIH and LOW below VIL. This parameter is measured with the output loading shown in Figure 2 for 3.3V I/O. This parameter is sampled. Transition is measured +500mV from steady state voltage. Refer to Technical Note TN-58-09, “Synchronous SRAM Bus Contention Design Considerations,” for a more thorough discussion on these parameters. OE\ is a “Don’t Care” when a byte write enable is sampled LOW. 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 least one byte write enable LOW and ADSP\ HIGH for the required setup and hold times. 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. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 9 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. AC TEST CONDITIONS Input Pulse Levels..................VIH = (VDD/2.2) +1.5V ..................VIL = (VDD/2.2) -1.5V Input rise and fall times..........................................1ns Input timing reference levels............................VDD/2.2 Output reference levels................................VDDQ/2.2 Output load.................................See Figures 1 and 2 OUTPUT LOADS +3.3v 317Ω DQ DQ Z0=50Ω 351Ω 50Ω 5 pF Vt = 1.5V Fig. 1 3.3V I/O OUTPUT LOAD EQUIVALENT Fig. 2 3.3V I/O OUTPUT LOAD EQUIVALENT NOTE: SRAM timing is dependent upon the capacitive loading on the outputs. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 10 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. SNOOZE MODE 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 guaranteed after the setup time tZZ is met. Any READ or WRITE operation pending when the device enters SNOOZE MODE is not guaranteed to complete successfully. Therefore, SNOOZE MODE must not be initiated until valid pending operations are completed. SNOOZE MODE ELECTRICAL CHARACTERISTICS ! NOTE: 1. This parameter is sampled. SNOOZE MODE WAVEFORM CLK t t ZZ RZZ ZZ t ZZI ISUPPLY t SB2 t ALL INPUTS* *Except ZZ 12345 1123456789 12345 11RZZI 12345 1123456789 12345 12345 1123456789 12345 11 12345 1123456789 12345 1234 1234 1234 Don’t Care 1234 1234 AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 11 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. t READ TIMING3 KC t KL ○ ○ ○ ○ ○ ○ ○ ○ ○ 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 ○ Deselect Cycle (note 4) ○ ○ ○ ○ 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 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234 1234 1234 1234 Undefined ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Q(A2+2) Burst wraps around to its initial state ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123 123 12 Q(A2+1) 12 12 123 121 ○ ○ Q(A2) ○ ○ ○ ○ BURST READ 1234 1234 1234 1234 Don’t Care tKQHZ ○ ○ ○ 12 12 12 ○ Q(A2+3) ○ ○ ○ ○ ○ 12 12 12 ○ ○ ○ ○ ○ Q(A2+2) SINGLE READ ○ ○ ○ ○ ○ ○ ○ ○ Q(A2+1) ○ ○ ○ 12 12 12 (Note 1) ○ 123 1234 123 1234 123 Q(A2) 1234 ○ ○ ○ t KQ tKQX ○ ○ ○ ○ t OELZ ○ ○ ○ ○ ○ ○ t KQ ○ ○ ○ t OEHZ 1234 1234 1234 1234 Q(A1) ○ KQLZ High-Z ○ Q OEQ ○ ○ ○ ○ ○ t t ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ OE\ ○ ○ ○ 1234567890123 12345678 1 1234567890123 12345678 1 1234567890123 1 12345678 1234567890123 12345678 1 1234567890123 12345678 1 1234567890123 12345678 1 ○ ADV\ suspends burst. ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ 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 ○ ○ tAAH ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ tAAS ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 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 123456 ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 1234567890123456789012345678901212345678901234567890123456789012123456789012345678 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 12345678901234 12345678901234 12345678901234 12345678901234 12345678901234 12345678901234 ○ 1234567890123456789012 123456 1 1234567890123456789012 123456 1 123456 1 1234567890123456789012 123456 1 ADV\ 1234567890123456789012 1234567890123456789012 123456 1 1234567890123456789012 123456 1 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ WS 12345 1234 1234567890 1234 1234 12345 1234567890 1234 1234567890 1234 12345 1234 1234 12345 1234567890 1234 1234 12345 1234567890 1234 1234 12345 1234 1234567890 1234 ○ ○ ○ ○ CEH ○ ○ ○ ○ t ○ ○ ○ ○ ○ ○ t A2 WH 123456 123456 123456 123456 123456 123456 123456 123456 ○ t 123456 123456 123456 123456 123456 123456 123456 123456 12345678 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 1 12345678 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 1 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 12345678 1 12345678 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 1 12345678 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 1 123456789012345678901234567890121234567890123456789012345678901212345678901234567890 12345678 1 ○ ○ ○ ○ t AH ○ t CES 123456 123456789012 12 123456 123456789012 12 123456789012 12 CE\ 123456 123456 123456789012 12 123456 123456789012 12 123456789012 12 (Note 2) 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ A1 1234567890123456789012 123456 1 1234567890123456789012 123456 1 1234567890123456789012 123456 1 123456 1 BWE\, GW\, 1234567890123456789012 1234567890123456789012 123456 1 1234567890123456789012 123456 1 1234567890123456789012 123456 1 BWa\ - BWd\ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ 12345678 12345678 123 12345678 12345678 123 123 12345678 12345678 12345678 123 12345678 12345678 123 12345678 123 12345678 12345678 ○ ○ t ADSH ○ ○ tAS ○ 1234567 1234567 12 1234567 1234567 12 1234567 1234567 12 1234567 1234567 12 ADDRESS 1234567 1234567 12 1234567 1234567 12 ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ t ADSS ○ ○ ○ ○ ○ ○ ○ t ADSH 12345 123456789 12345 1234 12345 123456789 12345 1234 12345 123456789 12345 1234 123456789 12345 12345 1234 123456789 12345 12345 1234 123456789 12345 12345 1234 KH 123456 123456 123456 123456 123456 123456 123456 123456 ○ 1234 1234 1234 ADSC\ 1234 1234 1234 t ○ ○ 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 ○ ○ t ADSS 123456 ○ 1234 1234 1234 1234 ADSP\ 1234 1234 ○ ○ ○ ○ ○ ○ CLK READ/WRITE TIMING PARAMETERS -8.5 SYMBOL MIN tKC 10.0 tKF MIN -10 -8.5 MAX 15 100 UNITS SYMBOL MIN tAS 1.8 2.0 ns MHz tADSS 1.8 2.0 ns ns 66 MAX MIN MAX UNITS tKH 3.0 4.0 ns tAAS 1.8 2.0 ns tKL 3.0 4.0 ns tWS 1.8 2.0 ns ns tCES 1.8 2.0 ns tKQ 8.5 10.0 tKQX 3.0 3.0 ns tAH 0.5 0.5 ns tKQLZ 3.0 3.0 ns tADSH 0.5 0.5 ns tKQHZ 5.0 5.0 ns tAAH 0.5 0.5 ns tOEQ 5.0 5.0 ns tWH 0.5 0.5 ns ns tCEH 0.5 0.5 ns tOELZ tOEHZ NOTE: -10 MAX 0 0 5.0 5.0 ns 1. Q(A2) refers to output from address A2. Q(A2+1) refers 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. Timing is shown assuming that the device was not enabled before entering into this sequence. 4. Outputs are disabled tKQHZ after deselect. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 12 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. t KC t WRITE TIMING KL ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ 12345 12345 12345 12345 12345 12345 12345 ○ ○ 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234567890 1234567890 1234567890 1234567890 1234567890 1234567890 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t 12345 12345 12345 12345 12345 12345 12345 12345 ○ ○ ○ ○ 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 12345 123456789 12345 12345 123456789 ADV\ suspends burst. AAH ○ ○ ○ ○ 12 12 12 12 D(A3+2) 12 12 12 12 ○ ○ ○ ○ ○ ○ ○ BURST WRITE 12345 12345 12345 12345Don’t Care 12 12 12 D(A3+1) 12 ○ ○ ○ ○ ○ D(A3) ○ ○ 12 12 ○ ○ 12 12 12 D(A2+1) 12 12 D(A2+2) 12 12 D(A2+3) 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12 12 ○ ○ ○ ○ ○ ○ Single WRITE ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234 123456789 12 1234 12 12 12 12 1234 123456789 12 1234 12 12 12 12 12 123456789 1234 12 D(A1) 1234 1234 12 1234 12 D(A2) 12 D(A2+1) 12 123456789 t OEHZ (Note 1) BURST READ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 12 1234567890123456789012345 123456 12 1234567890123456789012345 1234567890123456789012345 123456 12 123456 12 1234567890123456789012345 1234567890123456789012345 123456 12 123456 121234567890123456789012345 t AAS ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t WH 123456 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ t WS 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 123456789 12 123456789012345678901 123456789 12 123456789012345678901 123456789012345678901 123456789 12 123456789012345678901 123456789 12 123456789012345678901 123456789 12 123456789 12123456789012345678901 A3 ○ ○ ○ ○ ○ ○ t ADSH ○ ○ ○ ○ ○ 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 ○ 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ t ADSS 123456 ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 1234567890123 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 12 1234567890123 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 12 1234567890123 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 12 1234567890123 12 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 1234567890123 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 12 1234567890123 12 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 1234567890123 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ (Note 4) 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ tDS tDH ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 ○ ○ 12 12 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t WH ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ (Note 5) 123456 123456 123456 123456 123456 123456 ○ 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ High-Z ○ 12 Q 12 12 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t WS ○ ○ ○ ○ ○ ○ 12345 123456789 12345 12345 123456789 12345 12345 12345 123456789 123456789 12345 12345 123456789 12345 12345 12345 123456789 12345 ○ ○ ○ ○ D 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 ADSC\ extends burst. 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 123456 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 12345 1234 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 12345 1234 12345 1234 1234567890123456789012345678901212345678901234567890 12345 1234 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 12345 1234 123456789 12345 1234 123456789 (Note 3) ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 123456789 12345 1234 ○ ○ ○ ○ ○ OE\ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 12345 12345 1234567890 1234 1234 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 12345 1234567890 12345 1234 1234 ○ ○ ○ ○ 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456789012345678 123456 123456 123456 123456 123456 123456 123456 BYTE WRITE signals are ignored when ADSP\ is LOW. 12345 12345 1234567890 12345 123456789 12345 ○ ○ ○ CEH ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ A2 12345 1234 123456789 12345 1234 1234 12345 123456789 12345 1234 123456789 1234 12345 12345 1234 1234 12345 123456789 12345 1234 123456789 1234 12345 12345 1234 1234123456789 12345 12345 1234 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t CES t ○ ○ ○ ○ ○ ○ 1234 123456789 12345 1234 1234 123456789 12345 1234 1234 123456789 12345 1234 1234 123456789 12345 1234 1234 123456789 12345 1234 123456789 1234 12345 1234 1234567 123456789012 12 1234567 123456789012 12 123456789012 12 CE\ 1234567 1234567 123456789012 12 1234567 123456789012 12 123456789012 12 (See Note) 1234567 12345 12345 12345 ADV\ 12345 12345 12345 t AH 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 123456 123456 123456 123456 123456 123456 123456 123456 12345678 12 123456789012345678901234567890121234567890123 12345678 1 12345678 12 123456789012345678901234567890121234567890123 12345678 1 123456789012345678901234567890121234567890123 12345678 12 12345678 1 123456789012345678901234567890121234567890123 12345678 12 12345678 1 123456789012345678901234567890121234567890123 12345678 12 12345678 1 12345678 12 123456789012345678901234567890121234567890123 12345678 1 ○ ○ ○ ○ ○ ○ 12345 12345 12345 12345 GW\ 12345 12345 ○ ○ ○ ○ ○ ○ ○ A1 ○ 12345 12345 BWE\12345 12345 12345 BWa\ - BWd\ 12345 t ADSH 123456 123456 123456 123456 123456 123456 123456 ○ 12345 123456789 1234 12345 123456789 1234 12345 123456789 1234 12345 1234 123456789 12345 1234 123456789 12345 123456789 1234 12345678 12345678 123 12345678 12345678 123 123 12345678 12345678 123 12345678 12345678 123 12345678 12345678 12345678 12345678 123 ○ ○ tAS ○ 12345678 12345678 12 12345678 12345678 12 12345678 12345678 12 12345678 12 ADDRESS 12345678 12345678 12345678 12 12345678 12345678 12 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ 1234567 1234567 1234567 1234567 1234567 1234567 1234567 ○ t ADSS ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345 1234 123456789 12345 12345 1234 123456789 12345 12345 1234 123456789 12345 12345 1234 12345 123456789 12345 1234 12345 123456789 12345 1234 123456789 12345 KH 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t ADSH ○ 12345 12345 12345 ADSC\ 12345 12345 12345 123456 123456 123456 123456 123456 123456 123456 ○ t t 12345 123456 ADSS 12345 123456 12345 123456 12345 123456 ADSP\ 12345 12345 123456 123456 123456 ○ ○ ○ ○ ○ CLK Extended BURST WRITE 1234 1234 1234 1234Undefined WRITE TIMING PARAMETERS -8.5 SYMBOL MIN tKC 10.0 tKF MIN -10 -8.5 MAX 15 100 66 UNITS SYMBOL MIN MAX MIN ns tDS 1.8 2.0 MAX UNITS ns MHz tCES 1.8 2.0 ns tKH 3.0 4.0 ns tAH 0.5 0.5 ns tKL 3.0 4.0 ns tADSH 0.5 0.5 ns ns tAAH 0.5 0.5 ns tOEHZ NOTE: -10 MAX 5.0 5.0 tAS 1.8 2.0 ns tWH 0.5 0.5 ns tADSS 1.8 2.0 ns tDH tAAS 0.5 0.5 ns 1.8 2.0 ns tWS tCEH 0.5 0.5 ns 1.8 2.0 ns 1. D(A2) refers to output from address A2. D(A2+1) refers 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 BEW\, BWa\ - BWd\ LOW. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 13 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. t KC t READ/WRITE TIMING3 KL ○ ○ ○ ○ 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 ○ ○ ○ ○ ○ 12345678 12345678 12345678 12345678 12345678 12345678 ○ ○ ○ ○ 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 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ OELZ ○ ○ ○ ○ ○ ○ ○ t ○ t DH ○ High-Z D(A3) D(A5) ○ D Q ○ ○ ○ ○ DS ○ ○ t ○ ○ ○ ○ ○ OE\ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234567890123456 1234567890123456 1234567890123456 1234567890123456 1234567890123456 1234567890123456 ○ ○ 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234 123456789012345678901234567890121234567890 1234 1234567890123456789012345678901212345678901234 1234 1234 1234123456789012345678901234567890121234567890 1234567890123456789012345678901212345678901234 1234 1234 1234 1234123456789012345678901234567890121234567890 123456789012345678901234567890121234567890 1234 ○ 1234 123456789 12345 1234 123456789 12345 1234 123456789 12345 1234 123456789 12345 1234 12345 123456789 1234 123456789 12345 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ 12345678 12345678 12345678 12345678 12345678 12345678 12345678 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 123456789012345 123456789012345 123456789012345 123456789012345 123456789012345 123456789012345 123456789012345 ○ ○ ○ A6 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ A5 123 123 123 123 123 123 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ A4 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ t CEH ○ ○ ○ 123456 123456 123456 123456 123456 123456 123456 12345678 12345678901234567890123456789012123 12 12345678 1 12345678 12345678901234567890123456789012123 12 12345678 1 12345678901234567890123456789012123 12345678 12 12345678 1 12345678 12345678901234567890123456789012123 12 12345678 1 12345678 12 12345678 1 12345678901234567890123456789012123 12345678 12345678901234567890123456789012123 12 12345678 1 ○ t WS WH ○ ○ t 1234567890123456789012345678901212345678901 123456 1 1234567890123456789012345678901212345678901 123456 1 1234567890123456789012345678901212345678901 123456 1 123456 1 1234567890123456789012345678901212345678901 ADV\ 1234567890123456789012345678901212345678901 123456 1 1234567890123456789012345678901212345678901 123456 1 ○ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 12345678 12345678 123 12345678 12345678 123 123 12345678 12345678 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345678901234567 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 123456789 12345 12345 12345 123456789 12345 123456789 12345 ○ ○ ○ ○ CES 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 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ 1234567 1234567 1234567 1234567 1234567 1234567 A3 ○ ○ ○ ○ ○ 12345678 12345678901 1 123456 12 12345678 12345678901 1 123456 12 12345678 12345678901 1 123456 12 12345678 12345678901 1 123456 12 12345678 12345678901 1 123456 12 12345678 12345678901 1 123456 12 12345678901 123456 t 123456 123456 123456 123456 123456 123456 123456 ○ t AH ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ A2 ○ CE\ (See Note) 1234567 1234567 1234567 1234567 1234567 1234567 12345678 12345678 123 12345678 12345678 123 123 12345678 12345678 12345678 12345678 123 12345678 12345678 123 12345678 12345678 123 ○ tAS ○ ○ A1 ○ WEH\, WEL\, BWE\, GW\ 123456 123456 123456 123456 123456 123456 123456 ○ ○ ○ ○ ○ ○ 123 123 123 123 123 123 ○ ADDRESS 123456 123456 123456 123456 123456 123456 ○ tADSH 123456 123456 123456 123456 123456 123456 ○ 12345 12345 12345 ADSC\ 12345 12345 12345 tKH ○ 123456 123456 123456 123456 123456 ○ ○ ○ ○ tADSS 123456 ○ 12345 12345 12345 12345 ADSP\ 12345 12345 ○ ○ CLK ○ t OEHZ SINGLE WRITE Back-to-Back READs (Note 5) D(A6) KQ ○ 1234 1234 Q(A1) 123 123 Q(A2) 1234 123 t 12 12 12 Q(A4) 12(Note 1)12 12 12 Q(A4+1) 12 12 Q(A4+2) 12 112 12 Q(A4+3) BURST READ 1234 12345 1234 12345 1234 12345 12345Don’t Care 1234 Undefined Back-to-Back WRITEs WRITE TIMING PARAMETERS -8.5 SYMBOL tKC MIN 10.0 tKF tKH tKL tOELZ 1. 2. 3. 4. 5. MAX 15 3.0 66 4.0 3.0 4.0 8.5 0 tOEHZ NOTE: MIN 100 tKQ -8.5 -10 MAX 10.0 0 5.0 5.0 -10 SYMBOL MIN ns tWS 1.8 2.0 ns MHz tDS 1.8 2.0 ns ns tCES 1.8 2.0 ns ns tAH 0.5 0.5 ns ns tADSH 0.5 0.5 ns ns tWH 0.5 0.5 ns ns tDH 0.5 0.5 ns tCEH 0.5 0.5 ns UNITS tAS 1.8 2.0 ns tADSS 1.8 2.0 ns MAX MIN MAX UNITS Q(A4) refers to output from address A. Q(A4+1) refers to output from the next internal burst address following A4. 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. The data bus (Q) remains in High-A following a WRITE cycle unless an ADSP\, ADSC\ or ADV\ cycle is performed. GW\ is HIGH. Back-to-back READs may be controlled by either ADSP\ or ADSC\. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 14 SSRAM AS5SS256K36 & AS5SS256K36A Austin Semiconductor, Inc. MECHANICAL DEFINITIONS ASI Case #1001 (Package Designator DQ) 16.00 +0.20/-0.05 14.00 + 0.10 22.10 +0.10/-0.15 20.10 + 0.10 1.40 + 0.05 See Detail A 1.40 + 0.05 0.10+0.10/-0.05 1.00 TYP 1.50±0.10 NOTE: All dimensions in Millimeters. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 0.65 Basic 0.32+0.06/-0.10 0.60 + 0.15 Detail A Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 15 SSRAM Austin Semiconductor, Inc. AS5SS256K36 & AS5SS256K36A ORDERING INFORMATION EXAMPLE: AS5SS256K36ADQ-8.5/IT Package Device Number Options** Speed ns Process Type AS5SS256K36 A DQ -8.5 /* AS5SS256K36 A DQ -10 /* *AVAILABLE PROCESSES IT = Industrial Temperature Range XT = Extended Temperature Range 883C = Full Military Processing **DEFINITION OF OPTIONS 2-Chip Enable Pinout 3-Chip Enable Pinout -40oC to +85oC1 -55oC to +125oC -55oC to +125oC A no indicator NOTES: 1. -8.5/XT combination not available. AS5SS256K36 & AS5SS256K36A Rev. 3.5 2/03 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 16