HIGH SPEED 64K (4K X 16 BIT) IDT70824S/L SEQUENTIAL ACCESS RANDOM ACCESS MEMORY (SARAM™) Features ◆ ◆ ◆ ◆ ◆ ◆ High-speed access – Military: 35/45ns (max.) – Commercial: 20/25/35/45ns (max.) Low-power operation – IDT70824S Active: 775mW (typ.) Standby: 5mW (typ.) – IDT70824L Active: 775mW (typ.) Standby: 1mW (typ.) 4K x 16 Sequential Access Random Access Memory (SARAM™) – Sequential Access from one port and standard Random Access from the other port – Separate upper-byte and lower-byte control of the Random Access Port High speed operation – 20ns tAA for random access port – 20ns tCD for sequential port – 25ns clock cycle time Architecture based on Dual-Port RAM cells ◆ ◆ ◆ ◆ ◆ ◆ ◆ Compatible with Intel BMIC and 82430 PCI Set Width and Depth Expandable Sequential side – Address based flags for buffer control – Pointer logic supports up to two internal buffers Battery backup operation - 2V data retention TTL-compatible, single 5V (+10%) power supply Available in 80-pin TQFP and 84-pin PGA Military product compliant to MIL-PRF-38535 QML Industrial temperature range (–40°C to +85°C) is available for selected speeds Description The IDT70824 is a high-speed 4K x 16-Bit Sequential Access Random Access Memory (SARAM). The SARAM offers a single-chip solution to buffer data sequentially on one port, and be accessed randomly (asynchronously) through the other port. The device has a Dual-Port RAM based architecture with a standard SRAM interface for the random (asynchronous) access port, and a clocked interface with counter se- Functional Block Diagram 12 A0-11 CE OE R/W LB LSB MSB UB CMD Random Access Port Controls Sequential Access Port Controls 4K X 16 Memory Array 16 I/O0-15 12 DataL DataR AddrL AddrR 16 12 Reg. 12 16 RST SCLK CNTEN SOE SSTRT1 SSTRT2 SCE SR/W SLD SI/O0-15 , RST 12 12 Pointer/ Counter 12 Start Address for Buffer #1 End Address for Buffer #1 Start Address for Buffer #2 End Address for Buffer #2 Flow Control Buffer Flag Status EOB1 12 COMPARATOR EOB2 3099 drw 01 APRIL 2000 1 ©2000 Integrated Device Technology, Inc. DSC-3099/5 6.07 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges The IDT70824 is packaged in a 80-pin Thin Quad Flatpack (TQFP) or 84-pin Pin Grid Array (PGA). Military grade product is manufactured in compliance with the latest revision of MIL-PRF-38535 QML, making it ideally suited to military temperature applications demanding the highest level of performance and reliability. quencing for the sequential (synchronous) access port. Fabricated using CMOS high-performance technology, this memory device typically operates on less than 775mW of power at maximum highspeed clock-to-data and Random Access. An automatic power down feature, controlled by CE, permits the on-chip circuitry of each port to enter a very low standby power mode. SI/O2 SI/O3 VCC SI/O4 SI/O5 SI/O6 SI/O7 GND SI/O8 SI/O9 SI/O10 SI/O11 VCC SI/O12 SI/O13 SI/O14 SI/O15 GND N/C GND Pin Configurations(1,2,3) INDEX 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 2 58 3 SI/O1 SI/O0 GND N/C SCE SR/W RST SLD SSTRT2 SSTRT1 GND GND CNTEN SOE SCLK GND EOB2 EOB1 VCC I/O0 4 57 5 6 56 55 7 54 53 8 52 IDT70824PF PN80-1(4) 9 10 11 51 50 49 80-Pin TQFP Top View(5) 12 13 48 14 47 15 46 45 16 17 44 18 43 19 42 41 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 3099 drw 02 I/O1 GND I/O2 I/O3 VCC I/O4 I/O5 I/O6 I/O7 GND I/O8 I/O9 I/O10 I/O11 VCC I/O12 I/O13 I/O14 I/O15 GND 63 I/O1 66 I/O2 67 61 60 VCC 64 58 EOB1 55 59 62 56 65 I/O9 76 48 SR/W NC 57 53 SCLK GND 50 47 45 44 43 41 SI/O2 VCC 38 33 I/O6 GND 74 70 I/O5 I/O8 32 31 28 29 26 I/O14 82 7 2 NC 3 5 4 8 LB OE I/O15 GND 84 12 CMD VCC NC 1 11 6 10 A0 9 A2 14 A4 VCC 15 23 13 A7 16 20 22 A10 18 05 04 25 03 24 GND GND 19 06 27 NC SI/O15 17 07 30 SI/O14 SI/O13 83 08 36 SI/O12 VCC SI/O11 80 09 34 SI/O9 SI/O10 SI/O6 84-Pin PGA Top View(5) 78 77 35 10 37 SI/O8 SI/O7 GND IDT70824G G84-3(4) 11 39 SI/O4 SI/O5 73 71 NC 40 52 VCC , 42 SSTRT1 I/O12 I/O13 81 GND SCE SI/O0 SI/O1 SI/O3 I/O10 I/O11 VCC 79 46 68 I/O7 75 49 51 SSTRT2 I/O0 EOB2 SOE RST SLD NC I/O4 72 54 GND CNTEN GND I/O3 GND 69 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 VCC VCC A1 A0 CMD CE LB UB R/W OE 1 02 21 R/W UB CE A1 A5 A3 A6 A8 A9 A11 B C D E F G H J K L 01 , A Pin 1 Designator 3099 drw 03 NOTES: 1. All VCC pins must be connected to power supply. 2. All GND pins must be connected to ground supply. 3. PN80-1 package body is approximately 14mm x 14mm x 1.4mm. G84-3 package body is approximately 1.12 in x 1.12 in x .16 in. 4. This package code is used to reference the package diagram. 5. This text does not indicate orientation of the actual part-marking. 2 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Pin Descriptions: Random Access Port(1) SYMBOL NAME I/O DESCRIPTION A0-A11 Address Lines I Address inputs to access the 4096-word (16-Bit) memory array. I/O0-I/O15 Inputs/Outputs I Random access data inputs/outputs for 16-Bit wide data. CE Chip Enable I When CE is LOW, the random access port is enabled. When CE is HIGH, the random access port is disabled into power-down mode and the I/O outputs are in the High-impedance state. All data is retained during CE = VIH, unless it is altered by the sequential port CE and CMD may not be LOW at the same time. CMD Control Register Enable I When CMD is LOW, address lines A 0-A2, R/W, and inputs and outputs I/O0-I/O12, are used to access the control register, the flag register and the start and end of buffer registers. CMD and CE may not be LOW at the same time. R/W Read/Write Enable I If CE is LOW and CMD is HIGH, data is written into the array when R/W is LOW and read out of the array when R/W is HIGH. If CE is HIGH and CMD is LOW, R/W is used to access the buffer command registers. CE and CMD may not be LOW at the same time. OE Output Enable I When OE is LOW and R/W is HIGH, I/O0-I/O15 outputs are enabled. When OE is HIGH, the I/O outputs are in the High-impedance state. LB, UB Lower Byte, Upper Byte Enables I When LB is LOW, I/O0-I/O7 are accessible for re ad and write operations. When LB is HIGH, I/O0-I/O7 are tristated and blocked during read and write operations. UB controls access for I/O8-I/O15 in the same manner and is asynchronous from LB. VCC Power Supply I Seven +5 power supply pins. All V CC pins must be connected to the same +5V V CC supply. GND Ground I Ten ground pins. All ground pins must be connected to the same ground supply. 3099 tbl 01 Pin Descriptions: Sequential Access Port(1) SYMBOL NAME I/O DESCRIPTION SI/O0-15 Inputs/Outputs I/O Sequential data inputs/outputs for 16-bit wide data. SCLK Clock I SI/O0-SI/O15,SCE, SR/W, and SLD are registered on the LOW-to-HIGH transition of SCLK. Also, the sequential access port address pointer increments by 1 on each LOW-TO-HIGH transition of SCLK when CNTEN is LOW. SCE Chip Enable I When SCE is LOW, the sequential access port is enabled on the LOW-to-HIGH transitio n of SCLK. When SCE is HIGH, the sequential access port is disabled into powered-down mode on the LOW-to-HIGH transition of SCLK, and the SI/O outputs are in the High-impedance state. All data is retained , unless altered by the random access port. CNTEN Counter Enable I When CNTEN is LOW, the address pointer increments on the LOW-to-HIGH transition of SCLK. This function is independent of CE. SR/W Read/Write Enable I When SR/W and SCE are LOW, a write cycle is initiated on the LOW-to-HIGH transition of SCLK. When SR/W is HIGH, and SCE and SOE are LOW, a read cycle is initiated on the LOW-to-HIGH transition of SCLK. Termination o f a write cycle is done on the LOW-to -HIGH transition of SCLK if SR/W or SCE is HIGH. SLD Address Pointer Load Control I When SLD is sampled LOW, there is an internal delay of one cycle before the address pointer changes. When SLD is LOW, data on the inputs SI/O0-SI/O11 is loaded into a data-in register on the LOW-to-HIGH transition of SCLK. On the Cycle following SLD, the address pointer charges to the address location contained in the datain register. SSTRT1 and SSTRT2 may not be LOW while SLD is LOW or during the cycle following SLD. SSTRT1, SSTRT2 Load Start of Address Register I When SSTRT1 or SSTRT2 is LOW, the start of address register #1 or #2 is loaded into the address pointer on the LOW-to-HIGH transition of SCLK. The start addresses are stored in internal registers. SSTRT1 and SSTRT2 may not be LOW while SLD is LOW or during the cycle following SLD. EOB1, EOB2 End of Buffer Flag O EOB1 or EOB2 is output low when the address pointer is incremented to match the address stored in the end of buffer registers. The flags can be cleared by either asserting RST LOW or by writing ze ro into Bit 0 and/or Bit 1 of the control registe r at address 101. EOB1 and EOB2 are dependent on separate internal registers, and therefore separate match addresses. SOE Output Enable I SOE controls the data outputs and is independe nt of SCLK. When SOE is LOW, output buffers and the se quentially ad dressed data is output. When SOE is HIGH, the SI/O output bus is in the High-impedance state. SOE is asynchronous to SCLK. RST Reset I When RST is LOW, all internal registers are set to their default state, the address pointer is set to zero and the EOB1 and EOB2 flags are set HIGH. RST is asynchronous to SCLK. 3099 tbl 02 NOTE: 1. "I/O" is bidirectional Input and Output. "I" is Input and "O" is Output. 6.42 3 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Absolute Maximum Ratings Symbol VTERM(2) TBIAS Rating Commercial & Industrial Military Unit Terminal Voltage with Respect to GND -0.5 to +7.0 -0.5 to +7.0 V Temperature Under Bias -55 to +125 -55 to +125 Recommended Operating Temperature and Supply Voltage Grade o -65 to +135 o -65 to +150 Commercial C 50 50 mA 0V 5.0V + 10% 0OC to +70OC 0V 5.0V + 10% 0V 5.0V + 10% O -40 C to +85 C Recommended DC Operating Conditions Symbol Capacitance Parameter Supply Voltage GND Ground Input Capacitance Output Capacitance VIL Conditions(2) Max. Unit VIN = 3dV 9 pF V OUT = 3dV 10 pF Parameter VCC VIH (TA = +25°C, f = 1.0mhz, TQFP only) COUT -55OC to +125OC NOTES: 1. This is the parameter TA. 2. Industrial temperature: for specific speeds, packages and powers contact your sales office. 3099 tbl 03 CIN Vcc O Industrial C NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. VTERM must not exceed Vcc + 10% for more than 25% of the cycle time or 10ns maximum, and is limited to < 20mA for the period of VTERM > Vcc + 10%. Symbol GND Ambient Temperature 3099 tbl 04 DC Output Current IOUT Military and Commercial Temperature Ranges Military Storage Temperature TSTG (1) Input High Voltage Input Low Voltage Min. Typ. Max. Unit 4.5 5.0 5.5 V 0 0 0 V 2.2 ____ -0.5 (1) (2) 6.0 ____ 0.8 V V 3099 tbl 05 NOTES: 1. VIL > -1.5V for pulse width less than 10ns. 2. VTERM must not exceed Vcc + 10%. 3099 tbl 06 NOTES: 1. This parameter is determined by device characterization, but is not production tested. 2. 3dV references the interpolated capacitance when the input and output signals switch from 0V to 3V or from 3V to 0V. DC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range (VCC = 5.0V ± 10%) 70824S Symbol |ILI| Parameter Input Leakage Current Test Conditions Min. 70824L Max. Min. Max. Unit VCC = 5.5V, VIN = 0V to VCC ___ 5 ___ 1 µA 5 ___ 1 µA V |ILO| Output Leakage Current VOUT = 0V to V CC ___ VOL Output Low Voltage IOL = +4mA ___ 0.4 ___ 0.4 VOH Output High Voltage IOH = -4mA 2.4 ___ 2.4 ___ V 3099 tbl 07 4 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges DC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range(1,2,8) (VCC = 5.0V ± 10%) 70824X20 Com'l Only Symbol ICC ISB1 ISB2 ISB3 ISB4 Parameter Dynamic Operating Current (Both Ports Active) Standby Current (Both Ports - TTL Level Inputs) Standby Current (One Port - TTL Level Inputs) Full Standby Current (Both Ports CMOS Level Inputs) Full Standby Current (One Port CMOS Level Inputs) Test Condition CEL and CER = VIL, Outputs Open SCE = VIL(5) f = fMAX(3) Version 70824X25 Com'l Only 70824X35 Com'l & Military 70824X45 Com'l & Military Typ.(2) Max. Typ.(2) Max. Typ.(2) Max. Typ.(2) Max. Unit mA COM'L S L 180 180 380 330 170 170 360 310 160 160 340 290 155 155 340 290 MIL & IND S L ____ ____ ____ ____ ____ ____ ____ ____ 160 160 400 340 155 155 400 340 COM'L S L 25 25 70 50 25 25 70 50 20 20 70 50 16 16 70 50 MIL & IND S L ____ ____ ____ ____ ____ ____ ____ ____ 20 20 85 65 16 16 85 65 COM'L S L 115 115 260 230 105 105 250 220 95 95 240 210 90 90 240 210 MIL & IND S L ____ ____ ____ ____ ____ ____ ____ ____ 95 95 290 250 90 90 290 250 Both Ports CE and SCE > VCC - 0.2V(6) VIN > VCC - 0.2V or VIN < 0.2V, f = 0(4) COM'L S L 1.0 0.2 15 5 1.0 0.2 15 5 1.0 0.2 15 5 1.0 0.2 15 5 MIL & IND S L ____ ____ ____ ____ ____ ____ ____ ____ 1.0 0.2 30 10 1.0 0.2 30 10 One Port CE or SCE > VCC - 0.2V(6,7) Outputs Open (Active Port) f = fMAX(3) VIN > VCC - 0.2V or VIN < 0.2V COM'L S L 110 110 240 200 100 100 230 190 90 90 220 180 85 85 220 180 MIL & IND S L ____ ____ ____ ____ ____ ____ ____ ____ 90 90 260 215 85 85 260 215 SCE and CE = VIH(7) CMD = VIH f = fMAX(3) CE or SCE = VIH Active Port Outputs Open, f=fMAX(3) mA mA mA mA 3099 tbl 08 NOTES 1. 'X' in part number indicates power rating (S or L). 2. VCC = 5V, TA = +25°C; guaranteed by device characterization but not production tested. 3. At f = fMAX, address, control lines (except Output Enable), and SCLK are cycling at the maximum frequency read cycle of 1/tRC. 4. f = 0 means no address or control lines change. 5. SCE may transition, but is Low (SCE=VIL) when clocked in by SCLK. 6. SCE may be - 0.2V, after it is clocked in, since SCLK=VIH must be clocked in prior to powerdown. 7. If one port is enabled (either CE or SCE = LOW) then the other port is disabled (SCE or CE = HIGH, respectively). CMOS HIGH > Vcc - 0.2V and LOW < 0.2V, and TTL HIGH = VIH and LOW = VIL. 8. Industrial temperature: for specific speeds, packages and powers contact your sales office. Data Retention Characteristics Over All Temperature Ranges (L Version Only) (VLC < 0.2V, VHC > VCC - 0.2V) Symbol Parameter Test Condition Min. Typ. (1) Max. Unit 2.0 ___ ___ V µA VDR VCC for Data Retention VCC = 2V ICCDR Data Retention Current CE = VHC MIL. & IND. ___ 100 4000 VIN = VHC or = VLC COM'L. ___ 100 1500 ___ ___ ___ V tRC(2) ___ ___ V tCDR (3) Chip Deselect to Data Retention Time SCE = VHC(4) when SCLK = u tR(3) Operation Recovery Time CMD > VHC NOTES : 1. TA = +25°C, VCC = 2V; guaranteed by device characterization but not production tested. 2. tRC = Read Cycle Time 3. This parameter is guaranteed by device characterization, but is not production tested. 4. To initiate data retention, SCE = VIH must be clocked in. 6.42 5 3099 tbl 09 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Data Retention Power Down/Up Waveform (Random and Sequential Port)(1,2) DATA RETENTION MODE VCC VDR ≥ 2V 4.5V 4.5V tCDR CE tR VDR VIH VIH SCLK SCE tPD tPU ICC ISB 3099 drw 04 ISB NOTES : 1. SCE is synchronized to the sequential clock input. 2. CMD > VCC - 0.2V. 5V 5V 893Ω 893Ω DATAOUT DATAOUT 347Ω 30pF 347Ω 3099 drw 06 3099 drw 05 Figure 1. AC Output Test Load Figure 2. Output Test Load (for tCLZ, tBLZ, tOLZ, tCHZ, t BHZ, tOHZ,t WHZ, tCKHZ, and tCKLZ ) (*Including scope and jig.) 8 AC Test Conditions Input Pulse Levels Input Rise/Fall Times 7 GND to 3.0V 6 3ns Max. Input Timing Reference Levels 1.5V tAA/tCD/tEB 5 (Typical, ns) 4 Output Reference Levels 1.5V 3 Figures 1,2 and 3 2 Output Load 5pF* 1 3099 tbl 10 10pF is the I/O capacitance of this device, and 30pF is the AC Test Load capacitance. -1 -2 -3 20 40 60 80 100 120 140 160 180 200 CAPACITANCE (pF) 3099 drw 07 Figure 3. Lumped Capacitance Load Typical Derating Curve 6 , IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Truth Table I: Random Access Read and Write(1,2) Inputs/Outputs CE CMD R/W OE LB UB I/O0-I/O7 I/O8-I/O15 L H H L L L DATAOUT DATAOUT L H H L L H DATAOUT High-Z Read lower Byte only. L H H L Read upper Byte only. L L H H L L MODE Read both Bytes. H L High-Z DATAOUT (3) L L DATAIN DATAIN Write to both Bytes. (3) L H DATAIN High-Z Write to lower Byte only. (3) H H L H L H H L High-Z DATAIN Write to upper Byte only. H H X X X X High-Z High-Z Both Bytes deselected and powered down. L H H H X X High-Z High-Z Outputs disabled but not powered down. L H X X H H H H L L L H (3) H (4) L (4) L L High-Z High-Z Both Bytes deselected but not powered down. (4) DATAIN DATAIN Write I/O0-I/O11 to the Buffer Command Register. (4) DATAOUT DATAOUT Read contents of the Buffer Command Register via I/O0-I/O12. L L 3099 tbl 11 NOTES: 1. H = V IH, L = VIL, X = Don't Care, and HIGH-Z = High-impedance. 2. RST, SCE, CNTEN, SR/W, SLD, SSTRT1, SSTRT 2, SCLK, SI/O0-SI/O 15, EOB1, EOB2, and SOE are unrelated to the random access port control and operation. 3. If OE = VIL during write, tWHZ must be added to the tWP or tCW write pulse width to allow the bus to float prior to being driven. 4. Byte operations to control register using UB and LB separately are also allowed. Truth Table II: Sequential Read(1,2,3,6,8) Inputs/Outputs SCLK SCE CNTEN SR/W EOB1 EOB2 SOE SI/O ↑ L L H LOW LAST L [EOB1] ↑ L H H LAST LAST L [EOB1 - 1] ↑ L L H LAST LOW L [EOB2] ↑ L H H LAST LAST L [EOB2 - 1] ↑ L L H LOW LOW H High-Z MODE Counter Advanced Sequential Read with EOB1 reached. Non-Counter Advanced Sequential Read, without EOB1 reached Counter Advanced Sequential Read with EOB2 reched. Non-Counter Advanced Sequential Read without EOB2 reached Counter Advanced Sequential Non-Read with EOB1 and EOB2 reached 3099 tbl 12 Truth Table III: Sequential Write(1,2,3,4,5,6,7,8) Inputs/Outputs SCLK SCE CNTEN SR/W EOB1 EOB2 SOE SI/O ↑ L H L LAST LAST H SI/OIN Non-Counter Advanced Sequential Write, without EOB1 or EOB2 reached. ↑ L L L LOW LOW H SI/OIN Counter Advanced Sequential Write with EOB1 and EOB2 reached. ↑ H H X LAST LAST X High-Z No Write or Read due to Sequential port Deselect. No counter advance. ↑ H L X NEXT NEXT X High-Z No Write or Read due to Sequential port Deselect. Counter does advance. MODE 3099 tbl 13 NOTES: 1. H = VIH, L = VIL, X = Don't Care, and HIGH-Z = High-impedance. LOW = VOL. 2. RST, SLD, SSTRT 1, SSTRT 2 are continuously HIGH during a sequential write access, other than pointer access operations. 3. CE, OE, R/W, CMD, LB, UB, and I/O0-I/O15 are unrelated to the sequential port control and operation except for CMD which must not be used concurrently with the sequential port operation (due to the counter and register control). CMD should be HIGH (CMD = VIH) during sequential port access. 4. SOE must be HIGH (SOE=VIH) prior to write conditions only if the previous cycle is a read cycle, since the data being written must be an input at the rising edge of the clock during the cycle in which SR/W = VIL. 5. SI/O IN refers to SI/O0-SI/O15 inputs. 6. "LAST" refers to the previous value still being output, no change. 7. Termination of a write is done on the LOW-to-HIGH transition of SCLK if SR/W or SCE is HIGH. 8. When CLKEN=LOW, the address is incremented on the next rising edge before any operation takes place. See the diagrams called "Sequential Counter Enable Cycle after Reset, Read (and write) Cycle". 6.42 7 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Truth Table: Sequential Address Pointer Operations(1,2,3,4,5) Inputs/Outputs SCLK SLD SSTRT 1 SSTRT 1 SOE ↑ H L H X Non-Counter Advanced Sequential Write, without EOB1 or EOB2 reached. ↑ H H L X Counter Advanced Sequential Write with EOB1 and EOB2 reached. ↑ L H H H(6) No Write or Read due to Sequential port Deselect. No counter advance. MODE 3099 tbl 14 NOTES: 1. H = VIH, L = VIL, X = Don't Care, and High-Z = High-impedance. 2. RST is continuously HIGH. The conditions of SCE CNTEN, and SR/W are unrelated to the sequential address pointer operations. 3. CE, OE, R/W, LB, UB, and I/O0-I/O15 are unrelated to the sequential port control and operation, except for CMD which must not be used concurrently with the sequential port operation (due to the counter and register control). CMD should be HIGH (CMD = V IH) during sequential port access. 4. Address pointer can also change when it reaches an end of buffer address. See Flow Control Bits table. 5. When SLD is sampled LOW, there is an internal delay of one cycle before the address pointer changes. The state of CNTEN is ignored and the address is not incremented during the two cycles. 6. SOE may be LOW with SCE deselect or in the write mode using SR/W. Address Pointer Load Control (SLD) In SLD mode, there is an internal delay of one cycle before the address pointer changes in the cycle following SLD. When SLD is LOW, data on the inputs SI/O0-SI/O11 is loaded into a data-in register on the LOW-toHIGH transition of SCLK. On the cycle following SLD, the address pointer changes to the address location contained in the data-in register. SSTRT1, SSTRT2 may not be low while SLD is LOW, or during the cycle following SLD. The SSTRT1 and SSTRT2 require only one clock cycle, since these addresses are pre-loaded in the registers already. SLD Mode(1) SLD (1) SCLK B A ADDRIN SI/O0-11 C DATAOUT SSTRT(1 or 2) 3099 drw 08 NOTE: 1. At SCLK edge (A), SI/O0-SI/O 11 data is loaded into a data-in register. At edge (B), contents of the data-in register are loaded into the address pointer (i.e. address pointer changes). At SCLK edge (A), SSTRT1 and SSTRT2 must be HIGH to ensure for proper sequential address pointer loading. At SCLK edge (B), SLD and SSTRT1,2 must be HIGH to ensure for proper sequential address pointer loading. For SSTRT1 or SSTRT2, the data to be read will be ready for edge (B), while data will not be ready at edge (B) when SLD is used, but will be ready at edge (C). Sequential Load of Address into Pointer/Counter(1) MSB 15 14 13 12 11 -------------------------------------------------------------------------------------------------- 0 H H H L Address Loaded into Pointer LSB SI/O BITS 3099 drw 09 NOTE: 1. "H" = VIH and "L" = VIL for the SI/O intput state. 8 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Reset (RST) Register Setting RST LOW resets the control state of the SARAM. RST functions asynchronously of SCLK (i.e. not registered). The default states after a reset operation are displayed in the adjacent chart. Contents Address 0 EOB Flags Cleared to HIGH state Buffer Flow Mode BUFFER CHAINING Start Address Buffer #1 0 (1) End Address Buffer #1 4095 (4K) (1) Cleared (set at invalid points) (1) Cleared (set at invalid points) Start Address Buffer #2 End Address Buffer #2 Registered State SCE = VIH, SR/W = VIL 3099 tbl 15 NOTE: 1. Start address and End of address for Buffer #2 and the Flow Control for both Buffer #1 and #2, must be programmed as described in the "Buffer Command Mode" section. Buffer Command Mode (CMD) Buffer Command Mode (CMD) allows the random access port to control the state of the two buffers. Address pins A0-A2 and I/O pins I/O0I/O11 are used to access the start of buffer and the end of buffer addresses and to set the flow control mode of each buffer. The Buffer Command Mode also allows reading and clearing the status of the EOB flags. Seven different CMD cases are available depending on the conditions of A0-A2 and R/ W. Address bits A3-A11 and data I/O bits I/O12-I/O15 are not used during this operation. Random Access Port CMD Mode(1) Case # A2-A0 R/W DESCRIPTIONS 1 000 0 (1) Write (read) the start address of Buffer #1 through I/O 0-I/O11. 2 001 0 (1) Write (read) the end address of Buffer #1 through I/O0-I/O11. 3 010 0 (1) Write (read) the start address of Buffer #2 through I/O 0-I/O11. 4 011 0 (1) Write (read) the end address of Buffer #2 through I/O0-I/O11. 5 100 0 (1) Write (read) flow control register. 6 101 0 Write only - clear EOB1 and/or EOB2 flag. 7 101 1 Read only - flag status register. 8 110/111 (X) (Reserved) 3099 tbl 16 NOTE: 1. R/W input "0(1)" indicates a write(0) or read(1) occurring with the same address input. Cases 1 through 4: Start and End of Buffer Register Description(1,2) MSB 15 14 13 12 11 -------------------------------------------------------------------------------------------------- 0 H H H L Address Loaded into Buffer LSB I/O BITS 3099 drw 10 NOTES: 1. "H" = V OH for I/O in the output state and "Don't Cares" for I/O in the input state. "L" = VIL for I/O in the input state. 2. A write into the buffer occurs when R/W = VIL and a read when R/W = VIH. EOB1/SOB1 and EOB2/SOB2 are chosen through address A0-A2 while CMD = VIL and CE = VIH. Case 5: Buffer Flow Modes Within the SARAM, the user can designate one of two buffer flow modes for each buffer. Each buffer flow mode defines a unique set of actions for the sequential port address pointer and EOB flags. In BUFFER CHAINING mode, after the address pointer reaches the end of the buffer, it sets the corresponding EOB flag and continues from the start address of the other buffer. In STOP mode, the address pointer stops incrementing after it reaches the end of the buffer. There is no linear or mask mode available. 6.42 9 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges (1,2) Flow Control Register Description 0 15 MSB H H H H H H H H H H H 4 3 2 Counter Release (STOP Mode Only) 1 0 LSB I/O BITS Buffer #1 flow control Buffer #2 flow control 3099 drw 11 NOTES: 1. "H" = VOH for I/O in the output state and "Don't Cares"' for I/O in the input state. 2. Writing a 0 into bit 4 releases the address pointer after it is stopped due to the STOP mode and allows sequential write operations to resume. This occurs asynchronously of SCLK, and therefore caution should be taken. The pointer will be at address EOB+2 on the next rising edge of SCLK that is enabled by CNTEN. The pointer is also released by RST, SLD, SSTRT1 and SSTRT2 operations. Flow Control Bits(5) Flow Control Bit 1 & Bit 0 (Bit 3 & Bit 2) Mode Functional Description 00 BUFFER CHAINING 01 STOP EOB1 (EOB2) is asserted (Active LOW output) when the pointer matches the end address of Buffer #1 (Buffer #2). The pointer value is changed to the start address of Buffer #2 (Buffer #1)(1,3) EOB1 (EOB2) is asserted when the pointer matches the end address of Butler #1 (Butler #2). The address pointer will stop incrementing when it reaches the next address (EOB address + 1), if CNTEN is LOW on the next clock's rising edge. Otherwise, the address pointer will stop incrementing on EOB. Sequential write operations are inhibited after the address pointer is stopped. The pointer can be released by bit 4 of the flow control register. (1,2,4) 3099 tbl 17 NOTES: 1. EOB1 and EOB2 may be asserted (set) at the same time, if both end addresses have been loaded with the same value. 2. CMD flow control bits are unchanged, the count does not continue advancement. 3. If EOB1 and EOB2 are equal, then the pointer will jump to the start of Buffer #1. 4. If the counter has stopped at EOBx and was released by bit 4 of the flow control register, CNTEN must be LOW on the next rising edge of SCLK; otherwise the flow control will remain in the stop mode. 5. Flow Control Bit settings of '10' and '11' are reserved. 6. Start address and End of address for Buffer #2 and the Flow Control for both Buffer #1 and #2, must be programmed as described in the "Buffer Command Mode" section. RST conditions are not set to valid addresses. Cases 6 and 7: Flag Status Register Bit Description(1) 0 15 MSB H H H H H H H H H H H H H H 1 0 LSB I/O BITS End of buffer flag for Buffer #1 NOTE: 1. "H" = VOH for I/O in the output state and "Don't Cares" for I/O in the input state. End of buffer flag for Buffer #2 3099 drw 12 Cases 6: Flag Status Register Write Conditions(1) Flag Status Bit 0, (Bit 1) Case 7: Flag Status Register Read Conditions Functional Description 0 Clears Buffer Flag EOB1, (EOB2). 1 No chang e to the Buffer Flag. (2) Flag Status Bit 0, (Bit 1) 0 EOB1 (EOB2) flag has not been set, the Pointer has not reached the End of the Buffer. 1 EOB1 (EOB2) flag has been set, the Pointer has reached the end of the Buffer. 3099 tbl 18 NOTES: 1. Either bit 0 or bit 1, or both bits, may be changed simultaneously. One may be cleared while the second is left alone, or both may be cleared. 2. Remains as it was prior to the CMD operation, either HIGH (1) or LOW (0). Functional Description 3099 tbl 19 Cases 8 and 9: (Reserved) Illegal operations. All outputs will be HIGH on the I/O bus during a READ. 10 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Random Access Port: AC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range(2,4,5) 70824X20 Com'l Only Symbol Parameter Min. Max. Read Cycle Time 20 Address Access Time ____ Chip Enable Access Time ____ tBE Byte Enable Access Time ____ tOE Output Enable Access Time ____ tOH Output Hold from Address Change 70824X25 Com'l Only Min. Max. ____ 25 20 ____ 20 ____ 20 ____ 10 ____ 3 ____ 3 ____ 3 ____ 70824X35 Com'l & Military Min. Max. ____ 35 25 ____ 25 ____ 25 ____ 10 ____ 3 ____ 3 ____ 3 ____ 70824X45 Com'l & Military Min. Max. Unit ____ 45 ____ ns 35 ____ 45 ns 35 ____ 45 ns 35 ____ 45 ns 15 ____ 20 ns 3 ____ 3 ____ ns 3 ____ 3 ____ ns 3 ____ 3 ____ ns ns READ CYCLE tRC tAA tACE tCLZ tBLZ Chip Select Low-Z Time (1) Byte Select Low-Z Time (1) (1) tOLZ Output Enable Low-Z Time 2 ____ 2 ____ 2 ____ 2 ____ tCHZ Chip Select High-Z Time (1) ____ 10 . ____ 12 ____ 15 ____ 15 ns tBHZ (1) ____ tOHZ Byte Select High-Z Time Output Select High-Z Time (1) tPU Chip Select Power-Up Time tPD Chip Select Power-Down Time 10 ____ 12 ____ 15 ____ 15 ns ____ 9 ____ 11 ____ 15 ____ 15 ns 0 ____ 0 ____ 0 ____ 0 ____ ns ____ 20 ____ 25 ____ 35 ____ 45 ns 3099 tbl 20 Random Access Port: AC Electrical Characteristics Over the Operating Temperature and Supply Voltage(2,4,5) 70824X20 Com'l Only Symbol Parameter 70824X25 Com'l Only 70824X35 Com'l & Military 70824X45 Com'l & Military Min. Max. Min. Max. Min. Max. Min. Max. Unit 20 ____ 25 ____ 35 ____ 45 ____ ns 15 ____ 20 ____ 25 ____ 30 ____ ns 15 ____ 20 ____ 25 ____ 30 ____ ns 0 ____ 0 ____ 0 ____ 0 ____ ns 13 ____ 20 ____ 25 ____ 30 ____ ns 15 ____ 20 ____ 25 ____ 30 ____ ns ns WRITE CYCLE tWC tCW Write Cycle Time Chip Enable to End-of-Write tAW Address Valid to End-of-Write tAS Address Set-up Time tWP tBP Write Pulse Width (3) (3) (3) Byte Enable Pulse Width tWR Write Recovery Time 0 ____ 0 ____ 0 ____ 0 ____ tWHZ Write Enable Output High-Z Time (1) ____ 10 ____ 12 ____ 15 ____ 15 ns tDW Data Set-up Time 13 ____ 15 ____ 20 ____ 25 ____ ns 0 ____ 0 ____ 0 ____ 0 ____ ns 3 ____ 3 ____ 3 ____ 3 ____ tDH tOW Data Hold Time Output Active from End-of-Write ns 3099 tbl 21 NOTES: 1. Transition measured at 0mV from steady state. This parameter is guaranteed with the AC Output Test Load (Figure 1) by device characterization, but is not production tested. 2. 'X' in part number indicates power rating (S or L). 3. OE is continuously HIGH, OE = VIH. If during the R/W controlled write cycle the OE is LOW, tWP must be greater or equal to tWHZ + tDW to allow the I/O drivers to turn off and on the data to be placed on the bus for the required t DW. If OE is HIGH during the R/W controlled write cycle, this requirement does not apply and the minimum write pulse is the specified tWP . For the CE controlled write cycle, OE may be LOW with no degradation to tCW timing. 4. CMD access follows standard timing listed for both read and write accesses, (CE = VIH when CMD = VIL) or (CMD = VIH when CE = V IL). 5. Industrial temperature: for specific speeds, packages and powers contact your sales office. 6.42 11 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Waveform of Read Cycles: Random Access Port(1,2) tRC ADDR tAA tOH (2) tACS CE tCHZ tCLZ LB, UB tBHZ tBE tBLZ OE tOE tOHZ tOLZ I/OOUT Valid Data Out 3099 drw 13 NOTES: 1. R/W is HIGH for read cycle. 2. Address valid prior to or coincident with CE transition LOW; otherwise tAA is the limiting parameter. Waveform of Read Cycles: Buffer Command Mode tRC ADDR tAA tOH tACS (1) CMD tCHZ tCLZ LB, UB tBHZ tBE tBLZ OE tOE tOLZ tOHZ I/OOUT Valid Data Out 3099 drw 14 NOTE: 1. CE = VIH when CMD = VIL. 12 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Waveform of Write Cycle No.1 (R/W Controlled Timing) Random Access Port(1,6) tWC ADDR tAW R/W (8) CE, LB, UB tWR(3) tWP(2) tAS (5) tDH tDW I/OIN Valid Data In OE tOHZ tWHZ (4) (4) I/OOUT Data Out Data Out tACS tBE tOW 3099 drw 15 Waveform of Write Cycle No.2 (CE, LB, and/or UB Controlled Timing) Random Access Port(1,6,7) tWC ADDR tAW (8) CE, LB, UB (5) tAS (3) tWR (2) tCW tBP(2) R/W tDW I/OIN tDH Valid Data 3099 drw 16 NOTES: 1. R/W, CE, or LB and UB must be inactive during all address transitions. 2. A write occurs during the overlap of R/W = VIL, CE = V IL and LB = VIL and/or UB = VIL. 3. tWR is measured from the earlier of CE (and LB and/or UB) or R/W going HIGH to the end of the write cycle. 4. During this period, I/O pins are in the output state and the input signals must not be applied. 5. If the CE LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the High-impedance state. 6. OE is continuously HIGH, OE = VIH. If during the R/W controlled write cycle the OE is LOW, tWP must be greater or equal to tWHZ + tDW to allow the I/O drivers to turn off and on the data to be placed on the bus for the required t DW. If OE is HIGH during the R/W controlled write cycle, this requirement does not apply and the minimum write pulse is the specified tWP . For the CE controlled write cycle, OE may be LOW with no degregation to tCW timing. 7. I/OOUT is never enabled, therefore the output is in High-Z state during the entire write cycle. 8. CMD access follows the standard CE access described above. If CMD = VIL, then CE must = VIH or, when CE = VIL, CMD must = VIH. 6.42 13 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Sequential Port: AC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range(1,3) 70824X20 Com'l Only Symbol Parameter 70824X25 Com'l Only 70824X35 Com'l & Military 70824X45 Com'l & Military Min. Max. Min. Max. Min. Max. Min. Max. Unit 25 ____ 30 ____ 40 ____ 50 ____ ns 12 ____ 15 ____ 18 ____ ns 12 ____ 15 ____ 18 ____ ns ns READ CYCLE tCYC Sequential Clock Cycle Time tCH Clock Pulse HIGH 10 ____ tCL Clock Pulse LOW 10 ____ 5 ____ 5 ____ 6 ____ 6 ____ ns tES Count Enable and Address Pointer Set-up Time tEH Count Enable and Address Pointer Hold Time 2 ____ 2 ____ 2 ____ 2 ____ tSOE Output Enable to Data Valid ____ 8 ____ 10 ____ 15 ____ 20 ns tOLZ Output Enable Low-Z Time(2) 2 ____ 2 ____ 2 ____ 2 ____ ns (2) ____ 15 ns 45 ns ns tOHZ Output Enable High-Z Time 9 ____ 11 ____ 15 ____ tCD Clock to Valid Data ____ 20 ____ 25 ____ 35 ____ tCKHZ Clock High-Z Time(2) ____ 12 ____ 14 ____ 17 ____ 20 tCKLZ Clock Low-Z Time (2) 3 ____ 3 ____ 3 ____ 3 ____ ns tEB Clock to EOB ____ 13 ____ 15 ____ 18 ____ 23 ns 3099 tbl 22 Sequential Port: AC Electrical Characteristics Over the Operating Temperature and Supply Voltage(1,3) 70824X20 Com'l Only Symbol Parameter 70824X25 Com'l Only 70824X35 Com'l & Military 70824X45 Com'l & Military Min. Max. Min. Max. Min. Max. Min. Max. Unit 25 ____ 30 ____ 40 ____ 50 ____ ns 15 ____ 20 ____ 20 ____ ns 5 ____ 6 ____ 6 ____ ns 2 ____ 2 ____ 2 ____ ns 5 ____ 6 ____ 6 ____ ns 2 ____ 2 ____ 2 ____ WRITE CYCLE tCYC Sequential Clock Cycle Time tFS Flow Restart Time 13 ____ tWS Chip Select and Read/Write Set-up Time 5 ____ 2 ____ 5 ____ 2 ____ tWH tDS tDH Chip Select and Read/Write Hold Time Input Data Set-up Time Input Data Hold Time ns 3099 tbl 23 NOTES: 1. 'X' in part number indicates power rating (S or L). 2. Transition measured at 0mV from steady state. This parameter is guaranteed with the AC Output Test Load (Figure 1) by device characterization, but is not production tested. 3. Industrial temperature: for specific speeds, packages and powers contact your sales office. 14 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Sequential Port: AC Electrical Characteristics Over the Operating Temperature and Supply Voltage(1,2) 70824X20 Com'l Only Symbol Parameter 70824X25 Com'l Only 70824X35 Com'l & Military 70824X45 Com'l & Military Min. Max. Min. Max. Min. Max. Min. Max. Unit WRITE CYCLE tRSPW Reset Pulse Width 13 ____ 15 ____ 20 ____ 20 ____ ns tWERS Write Enable HIGH to Reset HIGH 10 ____ 10 ____ 10 ____ 10 ____ ns 10 ____ 10 ____ 10 ____ 10 ____ ns 15 ____ 20 ____ 25 ____ 25 ____ tRSRC Reset HIGH to Write Enable LOW tRSFV Reset HIGH to Flag Valid ns 3099 tbl 24 NOTES: 1. 'X' in part numbers indicates power rating (S or L). 2. Industrial temperature: for specific speeds, packages and powers contact your sales office. Sequential Port: Write, Pointer Load Non-Incrementing Read tCYC tCH tCL SCLK tES (2) (3) CNTEN tEH tES (1) SLD tDS SI/OIN tEH Dx tDH HIGH IMPEDANCE A0 tWS tWS tWH tWH SR/W tWS tWS tWH tWH SCE tCSZ tCKHZ tCD SOE tSOE tOLZ tOHZ D0 SI/OOUT tCKLZ NOTES: 1. If SLD = VIL, then address will be clocked in on the SCLK's rising edge. 2. If CNTEN = VIH for the SCLK's rising edge, the internal address counter will not advance. 3. Pointer is not incremented on cycle immediately following SLD even if CNTEN is LOW. 6.42 15 D0 D0 3099 drw 17 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Sequential Port: Write, Pointer Load, Burst Read tCH tCYC tCL SCLK tEH tES CNTEN (3) tES SLD (1) tDS SI/OIN (2) tEH Dx tDS tDH HIGH IMPEDANCE A0 tWS tWS tWH tDH D2 tWH SR/W tWS tWS tWH tWH SCE tSD SOE tSOP tOHZ tOLZ SI/OOUT D0 (2) D1 tCKLZ NOTES: 1. If SLD = VIL, then address will be clocked in on the SCLK's rising edge. 2. If CNTEN = VIH for the SCLK's rising edge, the internal address counter will not advance. 3. Pointer is not incremented on cycle immediately following SLD even if CNTEN is LOW. 3099 drw 18 Read STRT/EOB Flag Timing - Sequential Port tCH SCLK tCYC tCL tES CNTEN tEH (4) tES (2) tEH SSTRT1/2 (1) tDS SI/OIN HIGH IMPEDANCE Dx tWS tWS tWH tDH D3 tWH SR/W tWS SCE tWS tWH tWH (3) tCD SOE tSOE tOHZ tOLZ SI/OOUT (5) D0 D1 D2 (2) tCKLZ EOB1/2 tEB 3099 drw19 NOTES: (Also used in Figure "Read STRT/EOB Flag Timing") 1. If SSTRT1 or SSTRT2 = VIL, then address will be clocked in on the SCLK's rising edge. 2. If CNTEN = VIH for the SCLK's rising edge, the internal address counter will not advance. 3. SOE will control the output and should be HIGH on power-up. If SCE = VIL and is clocked in while SR/W = VIH, the data addressed will be read out within that cycle. If SCE = V IL and is clocked in while SR/W = V IL, the data addressed will be written to if the last cycle was a read. SOE may be used to control the bus contention and permit a write on this cycle. 4. Unlike SLD case, CNTEN is not disabled on cycle immediately following SSTRT. 5. If SR/W = VIL, data would be written to D0 again since CNTEN = VIH. 6. SOE = VIL makes no difference at this point since the SR/W = VIL disables the output until SR/W = VIH is clocked in on the next rising clock edge. 16 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Waveform of Write Cycles: Sequential Port tCYC tCH tCL SCLK tES CNTEN tES tEH (4) (3) tES tEH SLD (1) tDS SI/OIN tEH Dx tWS tDH A0 tDS tDS tDH tDH HIGH IMPEDANCE D1 D0 tWS tWH tWH (4) SR/W tWS tWS tWH tWH SCE tCKHZ tCD SOE (5) SI/OOUT tOHZ HIGH IMPEDANCE D0 3099 drw 20 tCKLZ Waveform of Burst Write Cycles: Sequential Port tCH tCYC tCL SCLK tES CNTEN (3) (2) tEH tES SLD (1) tDS SI/OIN tEH Dx tWS A0 tDS tDH tDH D0 tWS tWH D1 D2 tWH SR/W (5) tWS SCE tWS tWH tWH SOE (5) tCKLZ tCD SI/OOUT HIGH IMPEDANCE D2 3099 drw 21 NOTES: 1. If SLD = VIL, then address will be clocked in on the SCLK's rising edge. 2. If CNTEN = VIH for the SCLK's rising edge, the internal address counter will not advance. 3. Pointer is not incrementing on cycle immediately following SLD even if CNTEN is LOW. 4. If SR/W = VIL, data would be written to D0 again since CNTEN = VIH. 5. SOE = VIL makes no difference at this point since the SR/W = VIL disables the output until SR/W = VIH is clocked in on the next rising clock edge. 6.42 17 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Waveform of Write Cycles: Sequential Port (STRT/EOB Flag Timing) tCH tCL SCLK tES CNTEN tEH (2) (4) tEH tES SSTRT1/2 (1) tDS tDH SI/OIN D0 Dx tWS D1 D3 D2 HIGH IMPEDANCE tWS tWH tWH SR/W (5) tWS SCE tWS tWH tWH (3) SOE (6) tCKLZ tCD SI/OOUT HIGH IMPEDANCE D3 EOB1/2 tEB 3099 drw 22 NOTES: (Also used in Figure "Read STRT/EOB Flag Timing") 1. If SSTRT1 or SSTRT2 = VIL, then address will be clocked in on the SCLK's rising edge. 2. If CNTEN = VIH for the SCLK's rising edge, the internal address counter will not advance. 3. SOE will control the output and should be HIGH on power-up. If SCE = VIL and is clocked in while SR/W = VIH, the data addressed will be read out within that cycle. If SCE = V IL and is clocked in while SR/W = V IL, the data addressed will be written to if the last cycle was a read. SOE may be used to control the bus contention and permit a write on this cycle. 4. Unlike SLD case, CNTEN is not disabled on cycle immediately following SSTRT. 5. If SR/W = VIL, data would be written to D0 again since CNTEN = VIH. 6. SOE = VIL makes no difference at this point since the SR/W = VIL disables the output until SR/W = VIH is clocked in on the next rising clock edge. 18 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Sequential Counter Enable Cycle After Reset, Write Cycle(1,4,6) SCLK RST CNTEN SI/OIN (2) D0 D1 D2 D3 D4 3099 drw 23 Sequential Counter Enable Cycle After Reset, Read Cycle(1,4) SCLK RST SR/W (3) CNTEN (5) SI/OOUT D0 (5) D1 D2 D3 3099 drw 24 NOTES: 1. 'D0' represents data input for Address = 0, 'D1' represents data input for Address = 1, etc. 2. If CNTEN = VIL then 'D1' would be written into 'A1' at this point. 3. Data output is available at a t CD after the SR/W = V IH is clocked. The RST sets SR/W = LOW internally and therefore disables the output until the next clock. 4. SCE = VIL throughout all cycles. 5. If CNTEN=VIL then 'D1' would be clocked out (read) at this point. 6. SR/W = VIL. 6.42 19 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Random Access Port - Reset Timing tRSPW RST tRSRC R/W, SR/W CMD (4) or (UB + LB) tWERS tRSFV EOB(1 or 2) Flag Valid 3099 drw 25 Random Access Port Restart Timing of Sequential Port(1) 0.5 x tCYC tFS SCLK R/W (2) 2-5ns 6-7ns (3) CLR Block (Internal Signal) 3099 drw 26 NOTES: 1. The sequential port is in the STOP mode and is being restarted from the random port by the Bit 4 Counter Release (see Case 5). 2. "0" is written to Bit 4 from the random port at address [A2 - A0] = 100, when CMD = VIL and CE = VIH. The device is in the Buffer Command Mode (see Case 5). 3. CLR is an internal signal only and is shown for reference only. 4. Sequential port must also prohibit SR/W or SCE from being LOW for tWERS and tRSRC periods or SCLK must not toggle from LOW-to-HIGH until after tRSRC. 20 IDT70824S/L High-Speed 4K x 16 Sequential Access Random Access Memory Military and Commercial Temperature Ranges Ordering Information IDT 70824 X XX X X Device Type Power Speed Package Process/ Temperature Range Blank I(1) B Commercial (0°C to +70°C) Industrial (-40°C to +85°C) Military (–55°C to +125°C) Compliant to MIL-PRF-38535 QML G PF 84-pin PGA (G84-3) 80-pin TQFP (PN80-1) 20 25 35 45 Commercial Only Commercial Only Commercial & Military Commercial & Military S L Standard Power Low Power 70824 64K (4K x 16) Sequential Access Random Access Memory Speed in nanoseconds 3099 drw 27 NOTE: 1. Industrial temperature range is available on selected TQFP packages in standard power. For specific speeds, packages and powers contact your sales office. Datasheet Document History 3/8/99: 6/4/99: 11/10/99: 4/18/00: Initiated datasheet document history Converted to new format Cosmetic and typographical corrections Page 2 Added additional notes to pin configurations Changed drawing format Replaced IDT logo Page 3 Added "Outputs" in Sequential pin description table Changed ±200mV to 0mV in notes CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6166 fax: 408-492-8674 www.idt.com The IDT logo is a registered trademark of Integrated Device Technology, Inc. 6.42 21 for Tech Support: 831-754-4613 [email protected]