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Accutek Microcircuit Corporation
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. 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.
AK632256W-72 262,144 x 32 Bit CMOS/BiCMOS 72 Pin Format Static Random Access Memory
Front View 72-Pin SIM
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)
* 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 NOMENCLATURE
A0 - A17 CE1 - CE4 DQ1 - DQ32 OE PD0 - PD3 Vcc Vss WE NC Address Inputs Chip Enable Data In/Data Out Output Enable Presence Detect 5v Supply Ground Write Enable No Connect
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 A4 A11 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 A5 A12 Vcc A13 A6 DQ21 DQ29 DQ22 DQ38 DQ23 DQ31 DQ24 DQ32 Vss A18/NC A19/NC NC NC
1 2 3 4 5 6 7 8 9 10 11 12 13
NC NC PD2/NC PD3/NC Vss PD0 PD1 DQ1 DQ9 DQ2 DQ10 DQ3 DQ11 DQ4 DQ12 Vcc A0 A7
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
A1 A8 A2 A9 DQ13 DQ5 DQ14 DQ6 DQ15 DQ7 DQ16 DQ8 Vss WE A15 A14 CE2 CE1
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
MODULE OPTIONS
Leadless SIM: AK632256W-72
14 15 16 17 18
PD0 = Vss PD1 = Vss
PD2 = Open PD3 = Open
ORDERING INFORMATION PART NUMBER CODING INTERPRETATION
Position 1
1 2 3 4 5 6 7 8
MECHANICAL DIMENSIONS
Inches
0.680 0.680 0.670
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.
0.400 0.240 0.260
0.080 0.070 0.475 0.425 C L
CC LL
1
0.050 TYP 3.995 3.975 4.245 4.255 0.130 0.120
EXAMPLES:
AK632256W72-12 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: 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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