Accutek Microcircuit Corporation AK632256W-72 262,144 x 32 Bit CMOS/BiCMOS 72 Pin Format Static Random Access Memory DESCRIPTION The Accutek AK632256W-72 SRAM Module consists of fast high performance SRAMs mounted on a low profile, 72 pin SIM Board. The module utilizes four 28 pin 256K x 4 SRAMs in 400 mil SOJ packages and four decoupling capacitors mounted on each side of a printed circuit board. Front View 72-Pin SIM 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 0.680 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 module conforms to JEDEC standard sizes and pin-out configurations. Using four pins for module memory density identification, PD0 to PD3, minimizes interchangeability and design considerations when changing from one module size to another in customer applications. FEATURES · 262,144 x 32 bit organization · JEDEC Standardized 72 pin SIM or ZIP pinout · Common I/O, single OE functions with four separate chip selects (CE) · Low height, 0.680 inch maximum · Upward compatible with 512K x 32 (AK632512) and 1 Meg x 32 (AK6321024) PIN NOMENCLATURE · Downward compatible with 32K x 32 (AK63232), 64K x 32 (AK63264) and 128K x 32 AK632128 · Presence Detect PD0 to PD3 for identifying module density · Fast access times range from 12 nSEC BiCMOS to 45 nSEC CMOS · TTL-compatible inputs and outputs · Single 5 volt power supply - AK632256W-72 · Single 3.3 volt power supply - AK632256W-72/3.3 · 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 ASSIGNMENT FUNCTIONAL DIAGRAM PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # 1 NC 19 A1 37 CE4 55 A5 Chip Enable 2 NC 20 A8 38 CE3 56 A12 DQ1 - DQ32 Data In/Data Out 3 PD2/NC 21 A2 39 A17 57 Vcc OE Output Enable 4 PD3/NC 22 A9 40 A16 58 A13 5 Vss 23 DQ13 41 OE 59 A6 PD0 24 DQ5 42 Vss 60 DQ21 A0 - A17 Address Inputs CE1 - CE4 SYMBOL PD0 - PD3 Presence Detect 6 Vcc 5v Supply 7 PD1 25 DQ14 43 DQ25 61 DQ29 8 DQ1 26 DQ6 44 DQ17 62 DQ22 DQ38 Vss Ground 9 DQ9 27 DQ15 45 DQ26 63 WE Write Enable 10 DQ2 28 DQ7 46 DQ18 64 DQ23 No Connect 11 DQ10 29 DQ16 47 DQ27 65 DQ31 12 DQ3 30 DQ8 48 DQ19 66 DQ24 13 DQ11 31 Vss 49 DQ28 67 DQ32 14 DQ4 32 WE 50 DQ20 68 Vss 15 DQ12 33 A15 51 A3 69 A18/NC 16 Vcc 34 A14 52 A10 70 A19/NC 17 A0 35 CE2 53 A4 71 NC 18 A7 36 CE1 54 A11 72 NC NC MODULE OPTIONS Leadless SIM: AK632256W-72 PD0 = Vss PD1 = Vss PD2 = Open PD3 = Open MECHANICAL DIMENSIONS ORDERING INFORMATION Inches PART NUMBER CODING INTERPRETATION Position 1 2 3 4 5 6 7 8 0.400 0.240 0.260 1 CLCL 0.050 TYP 4.245 4.255 3.995 3.975 0.130 0.120 0.350 MAX AK632256W72-12 0.475 0.425 C L EXAMPLES: 0.080 0.070 Product AK = Accutek Memory 2 Type 4 = Dynamic RAM 5 = CMOS Dynamic RAM 6 = Static RAM 3 Organization/Word Width 1 = by 1 16 = by 16 4 = by 4 32 = by 32 8 = by 8 36 = by 36 9 = by 9 4 Size/Bits Depth 64 = 64K 4096 = 4 MEG 256 = 256K 8192 = 8 MEG 1024 = 1 MEG 16384 = 16 MEG 5 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) 6 Special Designation P = Page Mode N = Nibble Mode K = Static Column Mode W = Write Per Bit Mode V = Video Ram 7 Separator - = Commercial 00C to +700C M = Military Equivalent Screened (-550C to +1250C) I = Industrial Temperature Tested (-450C to +850C) X = Burned In 8 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 The numbers and coding on this page do not include all variations available but are shown as examples of the most widely used variations. Contact Accutek if other information is required. 0.680 0.670 1 256K x 32, 12 nSEC SRAM Module, 72 Pin SIM Configuration ACCUTEK MICROCIRCUIT CORPORATION BUSINESS CENTER at NEWBURYPORT 2 NEW PASTURE ROAD, SUITE 1 NEWBURYPORT, MA 01950-4054 PHONE: 978-465-6200 FAX: 978-462-3396 Email: [email protected] 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.