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| IS62C256 32K x 8 LOW POWER CMOS STATIC RAM FEATURES * Access time: 45, 70 ns * Low active power: 200 mW (typical) * Low standby power -- 250 W (typical) CMOS standby -- 28 mW (typical) TTL standby * Fully static operation: no clock or refresh required * TTL compatible inputs and outputs * Single 5V power supply ISSI (R) DESCRIPTION The ISSI IS62C256 is a low power, 32,768 word by 8-bit CMOS static RAM. It is fabricated using ISSI's highperformance, low power CMOS technology. When CS is HIGH (deselected), the device assumes a standby mode at which the power dissipation can be reduced down to 250 W (typical) at CMOS input levels. Easy memory expansion is provided by using an active LOW Chip Select (CS) input and an active LOW Output Enable (OE) input. The active LOW Write Enable (WE) controls both writing and reading of the memory. The IS62C256 is pin compatible with other 32K x 8 SRAMs in plastic SOP or TSOP (Type I) package. FUNCTIONAL BLOCK DIAGRAM A0-A14 DECODER 32K X 8 MEMORY ARRAY VCC GND I/O DATA CIRCUIT I/O0-I/O7 COLUMN I/O CS OE WE CONTROL CIRCUIT ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which may appear in this publication. (c) Copyright 1999, Integrated Silicon Solution, Inc. Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 1 IS62C256 PIN CONFIGURATION 28-Pin SOP A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WE A13 A8 A9 A11 OE A10 CS I/O7 I/O6 I/O5 I/O4 I/O3 ISSI PIN CONFIGURATION 28-Pin TSOP OE A11 A9 A8 A13 WE VCC A14 A12 A7 A6 A5 A4 A3 22 23 24 25 26 27 28 1 2 3 4 5 6 7 21 20 19 18 17 16 15 14 13 12 11 10 9 8 (R) A10 CS I/O7 I/O6 I/O5 I/O4 I/O3 GND I/O2 I/O1 I/O0 A0 A1 A2 PIN DESCRIPTIONS A0-A14 Address Inputs Chip Select Input Output Enable Input Write Enable Input Input/Output Power Ground TRUTH TABLE Mode Not Selected (Power-down) Output Disabled Read Write CS OE WE I/O0-I/O7 Vcc GND WE X H H L CS H L L L OE X H L X I/O Operation High-Z High-Z DOUT DIN Vcc Current ISB1, ISB2 ICC1, ICC2 ICC1, ICC2 ICC1, ICC2 ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM TBIAS TSTG PT IOUT Parameter Terminal Voltage with Respect to GND Temperature Under Bias Storage Temperature Power Dissipation DC Output Current (LOW) Value -0.5 to +7.0 -55 to +125 -65 to +150 Unit V C C W mA 0.5 20 Note: 1. Stress 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 Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 IS62C256 OPERATING RANGE Range Commercial Industrial Ambient Temperature 0C to +70C -40C to +85C VCC 5V 10% 5V 10% ISSI (R) DC ELECTRICAL CHARACTERISTICS Symbol VOH VOL VIH VIL ILI ILO Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage(1) Input Leakage Output Leakage Test Conditions VCC = Min., IOH = -1.0 mA VCC = Min., IOL = 2.1 mA Min. 2.4 -- 2.2 -0.3 -2 -10 -2 -10 Max. -- 0.4 VCC + 0.5 0.8 2 10 2 10 Unit V V V V A A GND VIN VCC GND VOUT VCC, Outputs Disabled Com. Ind. Com. Ind. Note: 1. VIL = -3.0V for pulse width less than 10 ns. POWER SUPPLY CHARACTERISTICS(1) (Over Operating Range) Symbol ICC1 ICC2 ISB1 Parameter Vcc Operating Supply Current Vcc Dynamic Operating Supply Current TTL Standby Current (TTL Inputs) CMOS Standby Current (CMOS Inputs) Test Conditions VCC = Max., CS = VIL IOUT = 0 mA, f = 0 VCC = Max., CS = VIL IOUT = 0 mA, f = fMAX VCC = Max., VIN = VIH or VIL CS VIH, f = 0 VCC = Max., CS VCC - 0.2V, VIN VCC - 0.2V, or VIN 0.2V, f = 0 -45 ns Min. Max. -- 60 -- 70 -- 70 -- 80 -- 5 -- 10 -- -- 0.5 1.0 -70 ns Min. Max. -- 60 -- 70 -- 65 -- 75 -- 5 -- 10 -- -- 0.5 1.0 Unit mA mA mA Com. Ind. Com. Ind. Com. Ind. Com. Ind. ISB2 mA Note: 1. At f = fMAX, address and data inputs are cycling at the maximum frequency, f = 0 means no input lines change. CAPACITANCE(1,2) Symbol CIN COUT Parameter Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Max. 8 10 Unit pF pF Notes: 1. Tested initially and after any design or process changes that may affect these parameters. 2. Test conditions: TA = 25C, f = 1 MHz, Vcc = 5.0V. Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 3 IS62C256 DATA RETENTION CHARACTERISTICS Symbol VDR IDR1 IDR2 Parameter VCC for retention of data Data retention current Data retention current Test Conditions VDR = 3.0V, TA = 0C to +25C VDR = 3.0V, TA = 0C to +70C Min. 2.0 -- -- Max. -- 200 200 ISSI Units V A A (R) READ CYCLE SWITCHING CHARACTERISTICS(1) (Over Operating Range) Symbol Parameter Read Cycle Time Address Access Time Output Hold Time -45 ns Min. Max. 45 -- 2 -- -- 0 0 3 0 0 -- -- 45 -- 45 25 -- 20 -- 20 -- 30 -70 ns Min. Max. 70 -- 2 -- -- 0 0 3 0 0 -- -- 70 -- 70 35 -- 25 -- 25 -- 50 Unit ns ns ns ns ns ns ns ns ns ns ns tRC tAA tOHA tACS tDOE tLZOE (2) (2) tHZOE tLZCS(2) tHZCS(2) tPU tPD (3) (3) CS Access Time OE Access Time OE to Low-Z Output OE to High-Z Output CS to Low-Z Output CS to High-Z Output CS to Power-Up CS to Power-Down Notes: 1. Test conditions assume signal transition times of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V and output loading specified in Figure 1. 2. Tested with the load in Figure 2. Transition is measured 500 mV from steady-state voltage. Not 100% tested. 3. Not 100% tested. AC TEST CONDITIONS Parameter Input Pulse Level Input Rise and Fall Times Input and Output Timing and Reference Levels Output Load Unit 0V to 3.0V 3 ns 1.5V See Figures 1 and 2 AC TEST LOADS 480 5V 5V 480 OUTPUT 100 pF Including jig and scope 255 OUTPUT 5 pF Including jig and scope 255 Figure 1. 4 Figure 2. Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 IS62C256 AC WAVEFORMS READ CYCLE NO. 1(1,2) t RC ADDRESS ISSI (R) t AA t OHA DOUT PREVIOUS DATA VALID t OHA DATA VALID READ1.eps READ CYCLE NO. 2(1,3) t RC ADDRESS t AA OE t OHA t DOE CS t HZOE t LZOE t ACS t LZCS t HZCS DATA VALID CS_RD2.eps DOUT HIGH-Z Notes: 1. WE is HIGH for a Read Cycle. 2. The device is continuously selected. OE, CS = VIL. 3. Address is valid prior to or coincident with CS LOW transitions. Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 5 IS62C256 WRITE CYCLE SWITCHING CHARACTERISTICS(1,3) (Over Operating Range) Symbol Parameter Write Cycle Time -45 ns Min. Max. 45 35 25 0 0 25 20 0 -- -- -- -- -- -- -- -- -70ns Min. Max. 70 60 60 0 0 55 30 0 -- -- -- -- -- -- -- -- Unit ns ns ns ns ns ns ns ns ISSI (R) tWC tSCS tAW tHA tSA tPWE tSD tHD (4) CS to Write End Address Setup Time to Write End Address Hold from Write End Address Setup Time WE Pulse Width Data Setup to Write End Data Hold from Write End Notes: 1. Test conditions assume signal transition times of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V and output loading specified in Figure 1. 2. Tested with the load in Figure 2. Transition is measured 500 mV from steady-state voltage. Not 100% tested. 3. The internal write time is defined by the overlap of CS LOW and WE LOW. All signals must be in valid states to initiate a Write, but any one can go inactive to terminate the Write. The Data Input Setup and Hold timing are referenced to the rising or falling edge of the signal that terminates the write. 4. Tested with OE HIGH. AC WAVEFORMS WRITE CYCLE NO. 1 (CS Controlled, OE is HIGH or LOW) (1 ) t WC ADDRESS VALID ADDRESS t SA CS t SCS t HA WE t AW t PWE1 t PWE2 t HZWE t LZWE HIGH-Z DOUT DATA UNDEFINED t SD DIN t HD DATAIN VALID CS_WR1.eps 6 Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 IS62C256 AC WAVEFORMS WRITE CYCLE NO. 2 (OE is HIGH During Write Cycle) (1,2) t WC ADDRESS VALID ADDRESS ISSI (R) t HA OE CS LOW t AW t PWE1 WE t SA DOUT DATA UNDEFINED t HZWE HIGH-Z t LZWE t SD DIN t HD DATAIN VALID CS_WR2.eps WRITE CYCLE NO. 3 (OE is LOW During Write Cycle) (1) t WC ADDRESS VALID ADDRESS OE CS LOW t HA LOW t AW t PWE2 WE t SA DOUT DATA UNDEFINED t HZWE HIGH-Z t LZWE t SD DIN t HD DATAIN VALID CS_WR3.eps Notes: 1. The internal write time is defined by the overlap of Cs LOW and WE LOW. All signals must be in valid states to initiate a Write, but any one can go inactive to terminate the Write. The Data Input Setup and Hold timing are referenced to the rising or falling edge of the signal that terminates the write. 2. I/O will assume the High-Z state if OE = VIH. Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 7 IS62C256 ISSI ORDERING INFORMATION Industrial Range: -40C to +85C Speed (ns) 45 70 Order Part No. IS62C256-45TI IS62C256-45UI IS62C256-70TI IS62C256-70UI Package TSOP Plastic SOP TSOP Plastic SOP (R) ORDERING INFORMATION Commerical Range: 0C to +70C Speed (ns) 45 70 Order Part No. IS62C256-45T IS62C256-45U IS62C256-70T IS62C256-70U Package TSOP Plastic SOP TSOP Plastic SOP ISSI (R) Integrated Silicon Solution, Inc. 2231 Lawson Lane Santa Clara, CA 95054 Tel: 1-800-379-4774 Fax: (408) 588-0806 E-mail: sales@issi.com www.issi.com 8 Integrated Silicon Solution, Inc. -- 1-800-379-4774 SR072-1E 05/12/99 |
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