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| DESCRIPTION Accutek Microcircuit Corporation AK632256AW 262,144 x 32 Bit CMOS/BiCMOS Static Random Access Memory The Accutek AK632256AW SRAM Module consists of eight fast high performance SRAMs mounted on a low profile, 64 pin SIM PCB. The module utilizes four 28 pin 256K x 4 SRAMs in 300 mil SOJ packages and four decoupling capacitor chips mounted on each side of a printed circuit board. The SRAMs used have common I/O functions and single output enable functions. Also, four separate chip select (CE) connections are used to independently enable the four bytes. The modules can be supplied in a variety of access time values from 12 nSEC to 45 nSEC in CMOS or BiCMOS technology. The Accutek module is designed to have a maximum seated height of 0.600 inch to provide for the lowest height off the board. By offset-mounting the back surface SRAMs the module can be mounted in either angled or straight-up SIM sockets. The modules conform to JEDEC standard sizes and pin-out configurations. Using two pins for module memory density identification, PD0 and PD1, minimizes interchangeability and design considerations when changing from one module size to another in customer applications. Top View 64-Pin SIM 1 32 33 64 FEATURES * * * * * 262,144 x 32 bit organization JEDEC Standardized 64 pin SIM format Available with solder or gold leads Presence Detect PD0 and PD1 for identifying module density Common I/O, single OE functions with four separate chip selects (CE) * Low height, 0.600 inch maximum seated height * Single 5 volt power suppy - AK632256AW * Single 3.3 volt power supply - AK632256AW/3.3 * Downward compatible with 128K x 32 (AK632128), 64K x 32 (AK63264) and 32K x 32 (AK63232) * Upward compatible with 512K x 32 (AK632512) and 1 Meg x 32 (AK6321024) * Fast access times range from 12 nSEC BiCMOS to 45 nSEC CMOS * TTL-compatible inputs and outputs * Operating temperature range in free air, 00C to 700C ELECTRICAL SPECIFICATIONS Timing diagrams and basic electrical characteristics are those of the standard 256K x 4 SRAMs used to construct these modules. Accutek's module design allows the flexibility of selecting industry-compatible 256K x 4 SRAMs from several semiconductor manufacturers. PIN NOMENCLATURE A0 - A17 CE1 - CE4 DQ1 - DQ32 OE PD0 - PD1 Vcc Vss WE Address Inputs Chip Enable Data In/Data Out Output Enable Presence Detect Power Supply Ground Write Enable PIN ASSIGNMENT PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL FUNCTIONAL DIAGRAM CE4 CE3 A17 A16 OE Vss DQ25 DQ17 DQ26 DQ18 DQ27 DQ19 DQ28 DQ20 A3 A10 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 A4 A11 A5 A12 Vcc A13 A6 DQ21 DQ29 DQ22 DQ30 DQ23 DQ31 DQ24 DQ32 Vss 1 2 3 4 5 6 7 8 9 10 11 Vss PD0 PD1 DQ1 DQ9 DQ2 DQ10 DQ3 DQ11 DQ4 DQ12 Vcc A0 A7 A1 A8 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 A2 A9 DQ13 DQ5 DQ14 DQ6 DQ15 DQ7 DQ16 DQ8 Vss WE A15 A14 CE2 CE1 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 MODULE OPTIONS Leadless SIM, Solder Leads: AK632256AW Leadless SIM, Gold Leads: AK632256AWG 12 13 14 15 16 PD0 = Vss PD1 = Vss ORDERING INFORMATION PART NUMBER CODING INTERPRETATION Position 1 2 Product AK = Accutek Memory Type 4 = Dynamic RAM 5 = CMOS Dynamic RAM 6 = Static RAM Organization/Word Width 1 = by 1 16 = by 16 4 = by 4 32 = by 32 8 = by 8 36 = by 36 9 = by 9 Size/Bits Depth 64 = 64K 4096 = 4 MEG 256 = 256K 8192 = 8 MEG 1024 = 1 MEG 16384 = 16 MEG Package Type G = Single In-Line Package (SIP) S = Single In-Line Module (SIM) D = Dual In-Line Package (DIP) W = .050 inch Pitch Edge Connect Z = Zig-Zag In-Line Package (ZIP) Special Designation P = Page Mode N = Nibble Mode K = Static Column Mode W = Write Per Bit Mode V = Video Ram Separator - = Commercial 00C to +700C M = Military Equivalent Screened (-550C to +1250C) I = Industrial Temperature Tested (-450C to +850C) X = Burned In Speed (first two significant digits) DRAMS SRAMS 50 = 50 nS 8= 8 nS 60 = 60 nS 10 = 10 nS 70 = 70 nS 12 = 12 nS 80 = 80 nS 15 = 15 nS 1 2 3 4 5 6 7 8 MECHANICAL DIMENSIONS Inches 0.600 MAX 0.425 0.375 3 1 C L 4 0.135 0.165 5 CC LL 6 0.050 TYP 3.855 3.845 7 8 72 The numbers and coding on this page do not include all variations available but are show as examples of the most widely used variations. Contact Accutek if other information is required. EXAMPLES: AK632256AWG-12 256K x 32, 12 nSEC SRAM Module, SIM Configuration with Gold Leads AK632256AW-15 256K x 32, 15nSEC SRAM Module, SIM Configuration with Solder Leads ACCUTEK MICROCIRCUIT CORPORATION BUSINESS CENTER at NEWBURYPORT 2 NEW PASTURE ROAD, SUITE 1 NEWBURYPORT, MA 01950-4054 VOICE: 978-465-6200 FAX: 978-462-3396 Email: sales@accutekmicro.com Internet: www.accutekmicro.com Accutek reserves the right to make changes in specifications at any time and without notice. Accutek does not assume any responsibility for the use of any circuitry described; no circuit patent licenses are implied. Preliminary data sheets contain minimum and maximum limits based upon design objectives, which are subject to change upon full characterization over the specific operating conditions. 0.350 MAX |
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