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| WED8L24257V Asynchronous SRAM, 3.3V, 256Kx24 FEATURES n 256Kx24 bit CMOS Static n Random Access Memory Array Fast Access Times: 10, 12, and 15ns Master Output Enable and Write Control TTL Compatible Inputs and Outputs Fully Static, No Clocks n Surface Mount Package 119 Lead BGA (JEDEC MO-163), No. 391 Small Footprint, 14mmx22mm Multiple Ground Pins for Maximum Noise Immunity n Single +3.3V (5%) Supply Operation n DSP Memory Solution Motorola DSP5630x Analog Devices SHARCTM DESCRIPTION The WED8L24257VxxBC is a 3.3V, twelve megabit SRAM constructed with three 256Kx8 die mounted on a multi-layer laminate substrate. With 10 to 15ns access times, x24 width and a 3.3V operating voltage, the WED8L24257V is ideal for creating a single chip memory solution for the Motorola DSP5630x (Figure 8) or a two chip solution for the Analog Devices SHARCTM DSP (Figure 9). The single or dual chip memory solutions offer improved system performance by reducing the length of board traces and the number of board connections compared to using multiple monolithic devices. The JEDEC Standard 119 lead BGA provides a 69% space savings over using six 256Kx4, 300 mil wide SOJs and the BGA package has a maximum height of 110 mils compared to 148 mils for the SOJ packages. The BGA package also allows the use of the same manufacturing and inspection techniques as the Motorola DSP, which is also in a BGA package. FIG. 1 1 A B C D E F G H J K L M N P R T U NC NC I/012 I/013 I/014 I/015 I/016 I/017 NC I/018 I/019 I/020 I/021 I/022 I/023 NC NC PIN CONFIGURATION PIN SYMBOLS 2 AO A5 NC VCC GND VCC GND VCC GND VCC GND VCC GND VCC NC A9 A13 3 A1 A6 NC GND VCC GND VCC GND VCC GND VCC GND VCC GND NC A10 A14 4 A2 E NC GND GND GND GND GND GND GND GND GND GND GND NC W G 5 A3 A7 NC GND VCC GND VCC GND VCC GND VCC GND VCC GND NC A11 A15 6 A4 A8 NC VCC GND VCC GND VCC GND VCC GND VCC GND VCC A17 A12 A16 7 NC NC I/00 I/01 I/02 I/03 I/04 I/05 NC I/06 I/07 I/08 I/09 I/010 I/011 NC NC A0-17 E W G DQ0-23 VCC GND NC PIN NAMES Address Inputs Chip Enable Master Write Enable Master Output Enable Common Data Input/Output Power (3.3V 5%) Ground No Connection BLOCK DIAGRAM A0-A17 G W E 18 256K x 24 Memory Array DQ0-7 DQ8-15 DQ16-23 July 2002 Rev. 1A ECO #15432 1 White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com WED8L24257V ABSOLUTE MAXIMUM RATINGS Voltage on any pin relative to VSS Operating Temperature TA (Ambient) Commercial Industrial Storage Temperature Power Dissipation Output Current -0.5V to 4.6V 0C to + 70C -40C to +85C -55C to +125C 1.5 Watts 50 mA RECOMMENDED DC OPERATING CONDITIONS Parameter Supply Voltage Supply Voltage Input High Voltage Input Low Voltage Sym VCC VSS VIH VIL Min 3.135 0 2.2 -0.3 Typ Max Units 3.3 3.465 V 0 0 V -- VCC+0.3 V -0.8 V *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 greater than those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. FIG. 2 FIG. 3 VCC 319 Q Z0 == 50 Z0 50 65 pF DOUT 353 AC TEST CONDITIONS Input Pulse Levels Input Rise and Fall Times Input and Output Timing Levels Output Load NOTE: For TEHQZ,TGHQZ and TWLQZ, Figure 3 RL = 50 5 pF VSS to 3.0V 5ns 1.5V Figure 2 VL = 1.5V DC ELECTRICAL CHARACTERISTICS Parameter Operating Power Supply Current Standby (TTL) Supply Current Full Standby CMOS Supply Current Input Leakage Current Output Leakage Current Output High Volltage Output Low Voltage Sym ICC1 ICC2 ICC3 ILI ILO VOH VOL Conditions W = VIL, II/O = 0mA, Min Cycle E > VIH, VIN < VIL or VIN > VIH, f=OMHz E > VCC-0.2V VIN > VCC-0.2V or VIN < 0.2V VIN = 0V to VCC V I/O = 0V to VCC IOH = -4.0mA IOL = 4.0mA Min 10ns 500 150 90 10 10 0.4 Max 12-15ns 480 150 90 10 10 0.4 Units mA mA mA A A V V 2.4 TRUTH TABLE G X H L X E H L L L W X H H L Mode Standby Output Deselect Read Write Output High Z High Z DOUT DIN Power ICC2,ICC3 ICC1 ICC1 ICC1 CAPACITANCE (f=1.0MHz, VIN=VCC or VSS) Parameter Address Lines Data Lines Write & Output Enable Lines Chip Enable Lines Sym CA CD/Q W, G EO-E2 Max 8 10 8 8 Unit pF pF pF pF These parameters are sampled, not 100% tested. White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com 2 July 2002 Rev. 1A ECO #15432 WED8L24257V AC CHARACTERISTICS READ CYCLE Parameter Read Cycle Time Address Access Time Chip Enable Access Time Chip Enable to Output in Low Z (1) Chip Disable to Output in High Z (1) Output Hold from Address Change Output Enable to Output Valid Output Enable to Output in Low Z (1) Output Disable to Output in High Z(1) NOTE 1: Parameter is guaranteed, but not tested. Symbol JEDEC Alt. TAVAV TRC TAVQV TAA TELQV TACS TELQX TCLZ TEHQZ TCHZ TAVQX TOH TGLQV TOE TGLQX TOLZ TGHQZ TOHZ 10ns Min Max 10 10 10 3 5 3 5 0 5 12ns Min Max 12 12 12 3 6 3 6 0 6 15ns Min Max 15 15 15 3 7 3 7 0 7 Units ns ns ns ns ns ns ns ns ns FIG. 4 READ CYCLE 1 - W HIGH, G, E LOW tAVAV A ADDRESS 1 ADDRESS 2 tAVQV Q tAVQX DATA 1 DATA 2 FIG. 5 READ CYCLE 2 - W HIGH tAVAV A tAVQV E tELQV tELQX G tEHQZ tGLQV tGLQX Q tGHQZ July 2002 Rev. 1A ECO #15432 3 White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com WED8L24257V AC CHARACTERISTICS WRITE CYCLE Symbol JEDEC Alt. TAVAV TWC TELWH TCW TELEH TCW Address Setup Time TAVWL TAS TAVEL TAS Address Valid to End of Write TAVWH TAW TAVEH TAW Write Pulse Width TWLWH TWP TWLEH TWP Write Recovery Time TWHAX TWR TEHAX TWR Data Hold Time TWHDX TDH TEHDX TDH Write to Output in High Z (1) TWLQZ TWHZ Data to Write Time TDVWH TDW TDVEH TDW Output Active from End of Write (1) TWHQX TWLZ Parameter Write Cycle Time Chip Enable to End of Write NOTE 1: Parameter is guaranteed, but not tested. 10ns Min Max 10 8 8 0 0 8 8 8 8 0 0 0 0 0 5 6 6 3 12ns Min Max 12 9 9 0 0 9 9 10 10 0 0 0 0 0 6 6 6 3 15ns Min Max 15 9 9 0 0 10 10 11 11 0 0 0 0 0 7 7 7 3 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns FIG. 6 WRITE CYCLE 1 - W CONTROLLED tAVAV A tAVWH tELWH E tWHAX tAVWL W tWLWH tDVWH tWHDX D DATA VALID tWLQZ Q HIGH Z tWHQX White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com 4 July 2002 Rev. 1A ECO #15432 WED8L24257V FIG. 7 WRITE CYCLE 2 - E CONTROLLED tAVAV A tAVEH tELEH E tEHAX tAVEL W tWLEH tDVEH tEHDX D Q HIGH Z DATA VALID ORDERING INFORMATION Commercial (0C to +70C) Part Number WED8L24257V10BC WED8L24257V12BC WED8L24257V15BC Speed (ns) 10 12 15 Package No. 391 391 391 Industrial (-40C to +85C) Part Number WED8L24257V12BI WED8L24257V15BI Speed (ns) 12 15 Package No. 391 391 PACKAGE NO. 391 119 LEAD BGA JEDEC MO-163 7.62 (0.300) TYP A B C D E F G 0.110 MAX R 1.52 (0.062) MAX (4x) A1 CORNER 14.00 (0.551) TYP 1.27 (0.050) TYP 22.00 (0.866) TYP 20.32 (0.800) TYP H J K L M N P R T U 1.27 (0.050) TYP 0.711 (0.028) MAX ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETICALLY IN INCHES July 2002 Rev. 1A ECO #15432 5 White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com WED8L24257V FIG. 8 INTERFACING THE MOTOROLA DSP5630x DSP FAMILY WITH THE WED8L24257V (256K x 24) WED8L24257V (256K x 24) A17-0 E Address Bus A23-0 AA0 AA1 AA2 AA3 W G DQ0-23 WED8L24257V (256K x 24) Motorola DSP5630x WR RD A17-0 E W G DQ0-23 WED8L24257V Databus D23-0 (256K x 24) A17-0 E W G DQ0-23 Notes: 1. In this example three 256K x 24 external memory arrays are shown, one for X data, one for Y data and one for Program. Specific applications may require one, two, or all three arrays. 2. Any combination of AA0-AA3 may be used as chip selects. However, each chip select may only be used to select one memory array. FIG. 9 INTERFACING THE ANALOG DEVICES 2106xL DSP FAMILY WITH THE WED8L24257V (256K x 24) Address Bus A31-0 WED8L24257V (256K x 24) A17-0 E W G MSX DQ16-23 DQ8-15 DQ0-7 Analog ADSP-2106xL WR RD A17-0 E W G WED8L24257V (256K x 24) DQ16-23 DQ8-15 DQ0-7 Databus D47-0 White Electronic Designs Corporation (508) 366-5151 www.whiteedc.com 6 July 2002 Rev. 1A ECO #15432 |
Price & Availability of WED8L24257V12BC
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