GS880V37AT-250/225/200 250 MHz–200 MHz 1.8 V VDD 1.8 V I/O 256K x 36 9Mb Sync Burst SRAMs 100-Pin TQFP Commercial Temp Industrial Temp Features • Single Cycle Deselect (SCD) operation • 1.8 V +10%/–10% core power supply • 1.8 V I/O supply • LBO pin for Linear or Interleaved Burst mode • Internal input resistors on mode pins allow floating mode pins • Default to Interleaved Pipeline mode • Byte Write (BW) and/or Global Write (GW) operation • Internal self-timed write cycle • Automatic power-down for portable applications • JEDEC-standard 100-lead TQFP package Functional Description Applications The GS880V37AT is a 9,437,184-bit high performance synchronous SRAM with a 2-bit burst address counter. Although of a type originally developed for Level 2 Cache applications supporting high performance CPUs, the device now finds application in synchronous SRAM applications, ranging from DSP main store to networking chip set support. Controls Addresses, data I/Os, chip enables (E1, E2, E3), address burst control inputs (ADSP, ADSC, ADV), and write control inputs (Bx, BW, GW) are synchronous and are controlled by a positive-edge-triggered clock input (CK). Output enable (G) and power down control (ZZ) are asynchronous inputs. Burst cycles can be initiated with either ADSP or ADSC inputs. In Burst mode, subsequent burst addresses are generated internally and are controlled by ADV. The burst address counter may be configured to count in either linear or interleave order with the Linear Burst Order (LBO) input. The Burst function need not be used. New addresses can be loaded on every cycle with no degradation of chip performance. SCD Pipelined Reads The GS880V37AT is a SCD (Single Cycle Deselect) pipelined synchronous SRAM. DCD (Dual Cycle Deselect) versions are also available. SCD SRAMs pipeline deselect commands one stage less than read commands. SCD RAMs begin turning off their outputs immediately after the deselect command has been captured in the input registers. Byte Write and Global Write Byte write operation is performed by using Byte Write enable (BW) input combined with one or more individual byte write signals (Bx). In addition, Global Write (GW) is available for writing all bytes at one time, regardless of the Byte Write control inputs. Sleep Mode Low power (Sleep mode) is attained through the assertion (High) of the ZZ signal, or by stopping the clock (CK). Memory data is retained during Sleep mode. Core and Interface Voltages The GS880V37AT operates on a 1.8 V power supply. All input are 1.8 V compatible. Separate output power (VDDQ) pins are used to decouple output noise from the internal circuits and are 1.8 V compatible. Parameter Synopsis Pipeline 3-1-1-1 1.8 V Rev: 1.03 7/2004 tKQ tCycle Curr (x36) -250 2.5 4.0 -225 2.7 4.4 -200 3.0 5.0 Unit ns ns 320 295 265 mA 1/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 A A E1 E2 BD BC BB BA E3 VDD VSS CK GW BW G ADSC ADSP ADV A A GS880V37A 100-Pin TQFP Pinout DQPC DQC DQC VDDQ VSS DQC DQC DQC DQC VSS VDDQ DQC DQC 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 LBO A A A A A1 A0 NC NC VSS VDD NC A A A A A A A A VDDQ/DNU VDD NC VSS DQD DQD VDDQ VSS DQD DQD DQD DQD VSS VDDQ DQD DQD DQPD 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 1 80 2 79 3 78 4 77 5 76 6 75 7 74 8 73 9 72 256K x 36 10 71 Top View 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 Rev: 1.03 7/2004 2/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 TQFP Pin Description Symbol Type Description A 0, A 1 I Address field LSBs and Address Counter preset Inputs A I Address Inputs DQA DQB DQC DQD I/O Data Input and Output pins NC — No Connect BW I Byte Write—Writes all enabled bytes; active low BA , BB I Byte Write Enable for DQA, DQB Data I/Os; active low BC , BD I Byte Write Enable for DQC, DQD Data I/Os; active low CK I Clock Input Signal; active high GW I Global Write Enable—Writes all bytes; active low E 1, E 3 I Chip Enable; active low E2 I Chip Enable; active high G I Output Enable; active low ADV I Burst address counter advance enable; active low ADSP, ADSC I Address Strobe (Processor, Cache Controller); active low ZZ I Sleep Mode control; active high LBO I Linear Burst Order mode; active low VDDQ I Core power supply VSS I I/O and Core Ground VDDQ I Output driver power supply VDDQ/DNU I VDDQ or VDD (must be tied high) or Do Not Use (must be left floating) Rev: 1.03 7/2004 3/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 GS880V37A Block Diagram A0–An Register D Q A0 A0 D0 A1 Q0 A1 D1 Q1 Counter Load A LBO ADV Memory Array CK ADSC ADSP Q D Register GW BW BA D Q Register D 36 Q BB 36 4 Register D Q D Q D Q Register Register D Q Register BC BD Register D Q Register E1 E2 E3 D Q Register D Q 1 G ZZ Rev: 1.03 7/2004 1 Power Down Control DQx1–DQx9 4/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Mode Pin Functions Mode Name Pin Name Burst Order Control LBO Power Down Control ZZ State Function L Linear Burst H Interleaved Burst L or NC Active H Standby, IDD = ISB Note: There is a pull-down device on the ZZ pin, so this input pin can be unconnected and the chip will operate in the default states as specified in the above tables. Burst Counter Sequences Linear Burst Sequence Interleaved Burst Sequence A[1:0] A[1:0] A[1:0] A[1:0] A[1:0] A[1:0] A[1:0] A[1:0] 1st address 00 01 10 11 1st address 00 01 10 11 2nd address 01 10 11 00 2nd address 01 00 11 10 3rd address 10 11 00 01 3rd address 10 11 00 01 4th address 11 00 01 10 Note: The burst counter wraps to initial state on the 5th clock. 4th address 11 10 01 00 Note: The burst counter wraps to initial state on the 5th clock. BPR 1999.05.18 Byte Write Truth Table Function GW BW BA BB BC BD Notes Read H H X X X X 1 Read H L H H H H 1 Write byte a H L L H H H 2, 3 Write byte b H L H L H H 2, 3 Write byte c H L H H L H 2, 3 Write byte d H L H H H L 2, 3 Write all bytes H L L L L L 2, 3 Write all bytes L X X X X X Notes: 1. All byte outputs are active in read cycles regardless of the state of Byte Write Enable inputs. 2. Byte Write Enable inputs BA, BB, BC and/or BD may be used in any combination with BW to write single or multiple bytes. 3. All byte I/Os remain High-Z during all write operations regardless of the state of Byte Write Enable inputs. Rev: 1.03 7/2004 5/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Synchronous Truth Table Operation Address Used State Diagram Key5 E1 E2 Deselect Cycle, Power Down None X H X X Deselect Cycle, Power Down None X L F Deselect Cycle, Power Down None X L Read Cycle, Begin Burst External R Read Cycle, Begin Burst External Write Cycle, Begin Burst ADV W3 DQ4 L X X High-Z L X X X High-Z F H L X X High-Z L T L X X X Q R L T H L X F Q External W L T H L X T D Read Cycle, Continue Burst Next CR X X H H L F Q Read Cycle, Continue Burst Next CR H X X H L F Q Write Cycle, Continue Burst Next CW X X H H L T D Write Cycle, Continue Burst Next CW H X X H L T D Read Cycle, Suspend Burst Current X X H H H F Q Read Cycle, Suspend Burst Current H X X H H F Q Write Cycle, Suspend Burst Current X X H H H T D ADSP ADSC Write Cycle, Suspend Burst Current H X X H H T D Notes: 1. X = Don’t Care, H = High, L = Low 2. E = T (True) if E2 = 1 and E3 = 0; E = F (False) if E2 = 0 or E3 = 1 3. W = T (True) and F (False) is defined in the Byte Write Truth Table preceding. 4. G is an asynchronous input. G can be driven high at any time to disable active output drivers. G low can only enable active drivers (shown as “Q” in the Truth Table above). 5. All input combinations shown above are tested and supported. Input combinations shown in gray boxes need not be used to accomplish basic synchronous or synchronous burst operations and may be avoided for simplicity. 6. Tying ADSP high and ADSC low allows simple non-burst synchronous operations. See BOLD items above. 7. Tying ADSP high and ADV low while using ADSC to load new addresses allows simple burst operations. See ITALIC items above. Rev: 1.03 7/2004 6/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Simplified State Diagram X Deselect W R Simple Burst Synchronous Operation Simple Synchronous Operation W X R R First Write CW First Read CR CR W X R R X Burst Write Burst Read X CR CW CR Notes: 1. The diagram shows only supported (tested) synchronous state transitions. The diagram presumes G is tied low. 2. The upper portion of the diagram assumes active use of only the Enable (E1, E2, and E3) and Write (BA, BB, BC, BD, BW, and GW) control inputs, and that ADSP is tied high and ADSC is tied low. 3. The upper and lower portions of the diagram together assume active use of only the Enable, Write, and ADSC control inputs, and assumes ADSP is tied high and ADV is tied low. Rev: 1.03 7/2004 7/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Simplified State Diagram with G X Deselect W R W X R R First Write CR CW W CW W X First Read X CR R Burst Write R CR CW W Burst Read X CW CR Notes: 1. The diagram shows supported (tested) synchronous state transitions plus supported transitions that depend upon the use of G. 2. Use of “Dummy Reads” (Read Cycles with G High) may be used to make the transition from Read cycles to Write cycles without passing through a Deselect cycle. Dummy Read cycles increment the address counter just like normal read cycles. 3. Transitions shown in gray tone assume G has been pulsed high long enough to turn the RAM’s drivers off and for incoming data to meet Data Input Set Up Time. Rev: 1.03 7/2004 8/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Absolute Maximum Ratings (All voltages reference to VSS) Symbol Description Value Unit VDD Voltage on VDD Pins –0.5 to 3.6 V VDDQ Voltage in VDDQ Pins –0.5 to 3.6 V VCK Voltage on Clock Input Pin –0.5 to 3.6 V VI/O Voltage on I/O Pins –0.5 to VDDQ +0.5 (≤ 3.6 V max.) V VIN Voltage on Other Input Pins –0.5 to VDD +0.5 (≤ 3.6 V max.) V IIN Input Current on Any Pin +/–20 mA IOUT Output Current on Any I/O Pin +/–20 mA PD Package Power Dissipation 1.5 W TSTG Storage Temperature –55 to 125 o TBIAS Temperature Under Bias –55 to 125 o C C Note: Permanent damage to the device may occur if the Absolute Maximum Ratings are exceeded. Operation should be restricted to Recommended Operating Conditions. Exposure to conditions exceeding the Absolute Maximum Ratings, for an extended period of time, may affect reliability of this component. Rev: 1.03 7/2004 9/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Power Supply Voltage Ranges Parameter Symbol Min. Typ. Max. Unit 1.8 V Supply Voltage VDD 1.6 1.8 2.0 V 1.8 V VDDQ I/O Supply Voltage VDDQ 1.6 1.8 2.0 V Note: The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device. I/O Logic Levels Parameter Symbol Min. Typ. Max. Unit Notes VDD Input High Voltage VIH 0.6*VDD — VDD + 0.3 V 1, 2 VDD Input Low Voltage VIL –0.3 — 0.3*VDD V 1, 2 VDDQ I/O Input High Voltage VIHQ 0.6*VDD — VDDQ + 0.3 V 1, 2, 3 VDDQ I/O Input Low Voltage VILQ –0.3 — 0.3*VDD V 1, 2 Notes: 1. The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device. 2. Input Under/overshoot voltage must be –2 V > Vi < VDDn+2 V, with a pulse width not to exceed 20% tKC. 3. VIHQ (max) is voltage on VDDQ pins plus 0.3 V. Recommended Operating Temperatures Parameter Symbol Min. Typ. Max. Unit Ambient Temperature (Commercial Range Versions) TA 0 25 70 °C Ambient Temperature (Industrial Range Versions) TA –40 25 85 °C Note: The part numbers of Industrial Temperature Range versions end the character “I”. Unless otherwise noted, all performance specifications quoted are evaluated for worst case in the temperature range marked on the device. Rev: 1.03 7/2004 10/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Undershoot Measurement and Timing Overshoot Measurement and Timing VIH 20% tKC VDD + 2.0 V VSS 50% 50% VDD VSS – 2.0 V 20% tKC VIL Capacitance (TA = 25oC, f = 1 MHZ, VDD = 1.8 V) Parameter Symbol Test conditions Typ. Max. Unit Input Capacitance CIN VIN = 0 V 4 5 pF Input/Output Capacitance CI/O VOUT = 0 V 6 7 pF Note: These parameters are sample tested. AC Test Conditions Parameter Conditions Input high level VDD – 0.2 V Input low level 0.2 V Input slew rate 1 V/ns Input reference level VDD/2 Output reference level VDDQ/2 Output load Fig. 1 Notes: 1. Include scope and jig capacitance. 2. Test conditions as specified with output loading as shown in Fig. 1 unless otherwise noted. 3. Device is deselected as defined by the Truth Table. Output Load 1 DQ 50Ω 30pF* VDDQ/2 * Distributed Test Jig Capacitance Rev: 1.03 7/2004 11/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 DC Electrical Characteristics Parameter Symbol Test Conditions Min Max Input Leakage Current (except mode pins) IIL VIN = 0 to VDD –1 uA 1 uA ZZ Input Current IIN1 VDD ≥ VIN ≥ VIH 0 V ≤ VIN ≤ VIH –1 uA –1 uA 1 uA 100 uA Input Current IIN2 VDD ≥ VIN ≥ VIL 0 V ≤ VIN ≤ VIL –100 uA –1 uA 1 uA 1 uA Output Leakage Current IOL Output Disable, VOUT = 0 to VDD –1 uA 1 uA Output High Voltage VOH IOH = –4 mA, VDDQ = 1.6 V VDDQ – 0.4 V — Output Low Voltage VOL IOL = 4 mA, VDD = 1.6 V — 0.4 V Operating Currents -250 -225 -200 Symbol 0 to 70°C –40 to 85°C 0 to 70°C –40 to 85°C 0 to 70°C –40 to 85°C IDD IDDQ 290 30 300 30 265 30 275 30 240 25 250 25 mA Pipeline ISB 20 30 20 30 20 30 mA Pipeline IDD 85 90 80 85 75 80 mA Parameter Test Conditions Mode Operating Current Device Selected; All other inputs ≥VIH or ≤ VIL Output open Pipeline Standby Current ZZ ≥ VDD – 0.2 V Deselect Current Device Deselected; All other inputs ≥ VIH or ≤ VIL Unit Note: All parameters listed are worst case scenario. Rev: 1.03 7/2004 12/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 AC Electrical Characteristics Pipeline Parameter Symbol Clock Cycle Time -250 -225 -200 Unit Min Max Min Max Min Max tKC 4.0 — 4.4 — 5.0 — ns Clock to Output Valid tKQ — 2.5 — 2.7 — 3.0 ns Clock to Output Invalid tKQX 1.0 — 1.0 — 1.0 — ns 1 1.0 — 1.0 — 1.0 — ns Clock to Output in Low-Z tLZ Setup time tS 1.2 — 1.3 — 1.4 — ns Hold time tH 0.2 — 0.3 — 0.4 — ns G to Output Valid tOE — 1.8 — 2.0 — 2.5 ns G to output in High-Z tOHZ1 — 1.8 — 2.0 — 2.5 ns Clock HIGH Time tKH 1.3 — 1.3 — 1.3 — ns Clock LOW Time tKL 1.5 — 1.5 — 1.5 — ns Clock to Output in High-Z tHZ1 1.5 2.3 1.5 2.5 1.5 3.0 ns G to output in Low-Z tOLZ1 0 — 0 — 0 — ns ZZ setup time tZZS2 5 — 5 — 5 — ns ZZ hold time tZZH2 1 — 1 — 1 — ns ZZ recovery tZZR 100 — 100 — 100 — ns Notes: 1. These parameters are sampled and are not 100% tested. 2. ZZ is an asynchronous signal. However, in order to be recognized on any given clock cycle, ZZ must meet the specified setup and hold times as specified above. Rev: 1.03 7/2004 13/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 Pipeline Mode Timing (+1) Begin Read A Cont Cont Deselect Write B Read C Read C+1 Read C+2 Read C+3 Cont Deselect tKC tKH tKL CK ADSP tS ADSC initiated read tH ADSC tS tH ADV tS tH A0–An A B C tS GW tS tH BW tH tS Ba–Bd tS Deselected with E1 tH E1 tS E2 and E3 only sampled with ADSC tH E2 tS tH E3 G tS tOE DQa–DQd Rev: 1.03 7/2004 tOHZ Q(A) tH D(B) tKQ tLZ tKQX tHZ Q(C) Q(C+1) 14/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Q(C+2) Q(C+3) © 2002, GSI Technology GS880V37AT-250/225/200 Sleep Mode During normal operation, ZZ must be pulled low, either by the user or by its internal pull down resistor. When ZZ is pulled high, the SRAM will enter a Power Sleep mode after 2 cycles. At this time, internal state of the SRAM is preserved. When ZZ returns to low, the SRAM operates normally after ZZ recovery time. Sleep mode is a low current, power-down mode in which the device is deselected and current is reduced to ISB2. The duration of Sleep mode is dictated by the length of time the ZZ is in a High state. After entering Sleep mode, all inputs except ZZ become disabled and all outputs go to High-Z The ZZ pin is an asynchronous, active high input that causes the device to enter Sleep mode. When the ZZ pin is driven high, ISB2 is guaranteed after the time tZZI is met. Because ZZ is an asynchronous input, pending operations or operations in progress may not be properly completed if ZZ is asserted. Therefore, Sleep mode must not be initiated until valid pending operations are completed. Similarly, when exiting Sleep mode during tZZR, only a Deselect or Read commands may be applied while the SRAM is recovering from Sleep mode. Sleep Mode Timing Diagram tKH tKC tKL CK Setup Hold ADSP ADSC tZZR tZZS tZZH ZZ Application Tips Single and Dual Cycle Deselect SCD devices (like this one) force the use of “dummy read cycles” (read cycles that are launched normally but that are ended with the output drivers inactive) in a fully synchronous environment. Dummy read cycles waste performance but their use usually assures there will be no bus contention in transitions from reads to writes or between banks of RAMs. DCD SRAMs do not waste bandwidth on dummy cycles and are logically simpler to manage in a multiple bank application (wait states need not be inserted at bank address boundary crossings) but greater care must be exercised to avoid excessive bus contention. Rev: 1.03 7/2004 15/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 TQFP Package Drawing (Package T) L Min. Nom. Max A1 Standoff 0.05 0.10 0.15 A2 Body Thickness 1.35 1.40 1.45 b Lead Width 0.20 0.30 0.40 c Lead Thickness 0.09 — 0.20 D Terminal Dimension 21.9 22.0 22.1 D1 Package Body 19.9 20.0 20.1 E Terminal Dimension 15.9 16.0 16.1 E1 Package Body 13.9 14.0 14.1 e Lead Pitch — 0.65 — L Foot Length 0.45 0.60 0.75 L1 Lead Length — 1.00 — Y Coplanarity θ Lead Angle e D D1 Description c Pin 1 Symbol L1 θ b A1 A2 0.10 E1 E Y 0° — 7° Notes: 1. All dimensions are in millimeters (mm). 2. Package width and length do not include mold protrusion. Thermal Characteristics Package 100 TQFP (T) Rev: 1.03 7/2004 Junction to Ambient (θJa) (°C/W) 0 m/s 1 m/s 2 m/s 20.4 19.1 17.2 16/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Junction to Case (θJc) (°C/W) 3.6 © 2002, GSI Technology GS880V37AT-250/225/200 Ordering Information for GSI Synchronous Burst RAMs Org Part Number1 Type Package Speed2 (MHz) TA3 256K x 36 GS880V37AT-250 Pipeline TQFP 250 C 256K x 36 GS880V37AT-225 Pipeline TQFP 225 C 256K x 36 GS880V37AT-200 Pipeline TQFP 200 C 256K x 36 GS880V37AT-250I Pipeline TQFP 250 I 256K x 36 GS880V37AT-225I Pipeline TQFP 225 I Status 256K x 36 GS880V37AT-200I Pipeline TQFP 200 I Notes: 1. Customers requiring delivery in Tape and Reel should add the character “T” to the end of the part number. Example: GS880V37AT-200IT. 2. TA = C = Commercial Temperature Range. TA = I = Industrial Temperature Range. 3. GSI offers other versions this type of device in many different configurations and with a variety of different features, only some of which are covered in this data sheet. See the GSI Technology web site (www.gsitechnology.com) for a complete listing of current offerings. Rev: 1.03 7/2004 17/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology GS880V37AT-250/225/200 9Mb Sync SRAM Datasheet Revision History DS/DateRev. Code: Old; New Types of Changes Format or Content • Creation of new datasheet 880V37A_r1 880V37A_r1_01 Content 880V37A_r1_01; 880V37A_r1_02 Content 880V37A_r1_02; 880V37A_r1_03 Content/Format Rev: 1.03 7/2004 Page;Revisions;Reason • Updated tKQ in table on page 1 and in AC Characteristics table on page 13 • Updated timing diagram • Corrected ordering information (added “V” to part number) • Updated format • Removed Preliminary banner due to part qualification 18/18 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. © 2002, GSI Technology