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AK632256AW-72 Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
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AK632256AW-72 Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
1 / 2 page DESCRIPTION The Accutek AK632256AW-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 300 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 en- able 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 off- set-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, mini- mizes 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 se- lects (CE) · Low height, 0.605 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 - AK632256AW-72 · Single 3.3 volt power supply - AK632256AW-72/3.3 · Operating temperature range in free air, 0 0Cto700C 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 indus- try-compatible 256K x 4 SRAMs from several semiconductor manu- facturers. ACCUTEK MICROCIRCUIT CORPORATION AK632256AW-72 262,144 x 32 Bit CMOS/BiCMOS 72 Pin Format Static Random Access Memory Front View 72-Pin SIM PIN NOMENCLATURE A0 -A17 Address Inputs CE1 -CE4 Chip Enable DQ1 -DQ32 Data In/Data Out OE Output Enable PD0 -PD3 Presence Detect Vcc 5v Supply Vss Ground WE Write Enable NC No Connect MODULE OPTIONS Leadless SIM: AK632256AW-72 PIN ASSIGNMENT PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL 1NC 19 A1 37 CE455 A5 2NC 20 A8 38 CE3 56 A12 3 PD2/NC 21 A2 39 A17 57 Vcc 4 PD3/NC 22 A9 40 A16 58 A13 5 Vss 23 DQ13 41 OE 59 A6 6 PD0 24 DQ5 42 Vss 60 DQ21 7 PD1 25 DQ14 43 DQ25 61 DQ29 8 DQ1 26 DQ6 44 DQ17 62 DQ22 9 DQ9 27 DQ15 45 DQ26 63 DQ38 10 DQ2 28 DQ7 46 DQ18 64 DQ23 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 CE253 A4 71 NC 18 A7 36 CE1 54 A11 72 NC PD0 = Vss PD2 = Open PD1 = Vss PD3 = Open FUNCTIONAL DIAGRAM |
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