256K x 32 SRAM MODULE SYS32256ZK/LK - 12/15/17 Issue 1.1 : January 1999 Description Features The SYS32256 is a plastic 8Mbit Static RAM Module offered in Industry Standard 64 pin ZIP and 64 lead SIMM package, organised as 256K x 32. The module utilises eight fast 256K x 4 SRAMs housed in SOJ packages, and uses double sided surface mount techniques, to achieve a very high density module. Four chip selects are used to independently enable the four bytes. Reading or Writing is executed on individual or any combination of multiple bytes. Two pins PD0 & PD1 are used to identify module memory density where alternative versions of the JEDEC standard modules can be interchanged. Block Diagram • • • • • • • • • Access Times of 12/15/17 ns. 64 Pin ZIP & SIMM pinouts. 5 Volt Supply ± 10%. Power Dissipation : Operating (32bit mode) 9.0 W (maximum). Standby (CMOS) -L 1.3 W (maximum). Completely Static Operation. Equal Access and Cycle Times. All Inputs and Outputs Directly TTL Compatible. On-board Supply Decoupling Capacitors. 72 pin SIMM (SYS32256LKX) available. SIMM Pin Definition ZIP A0-A17 OE WE 256Kx4 SRAM D0-D3 256Kx4 SRAM D4-D7 256Kx4 SRAM D8-D11 256Kx4 SRAM D12-D15 256Kx4 SRAM D16-D19 256Kx4 SRAM D20-D23 CS1 CS2 CS3 256Kx4 SRAM 256Kx4 SRAM D24-D27 CS4 Pin Functions Address Inputs Data Input/Output Chip Select Write Enable Output Enable Presence Detect Power (+5V) Ground A0 ~ A17 D28-D31 PD0 D0 D1 D2 D3 Vcc A7 A8 A9 D4 D5 D6 D7 WE A14 CS1 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 CS3 A16 GND D16 D17 D18 D19 A10 A11 A12 A13 D20 D21 D22 D23 GND 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 GND PD1 D8 D9 D10 D11 A0 A1 A2 D12 D13 D14 D15 GND A15 CS2 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 CS4 A17 OE D24 D25 D26 D27 A3 A4 A5 VCC A6 D28 D29 D30 D31 Gnd PD0 PD1 D0 D8 D1 D9 D2 D10 D3 D11 Vcc A0 A7 A1 A8 A2 A9 D12 D4 D13 D5 D14 D6 D15 D7 Gnd WE A15 A14 CS2 CS1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 CS4 CS3 A17 A16 OE Gnd D24 D16 D25 D17 D26 D18 D27 D19 A3 A10 A4 A11 A5 A12 Vcc A13 A6 D20 D28 D21 D29 D22 D30 D23 D31 Gnd 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 D0 ~ D31 CS1~4 Package Details WE OE Plastic 64 Pin ZIP PD0~1 VCC GND Plastic 64 Pin SIMM ISSUE 1.1 January 1999 SYS32256ZK/LK - 12/15/17 Package Information Dimensions in mm Plastic 64 Pin Zig-Zag-In-line Package (ZIP) 8.89 Max. 92.71 15.49 MAX Pin 1 2.54 typ. 6.35typ 2.54 typ. 3.80 MIN Plastic 64 Pin Single In-line Memory Module (SIMM) 97.92 5.59 10.16 15.24 91.03 48.90 Ordering Information SYS32256ZK/LKLI - 012 Speed 12 15 17 = 12 ns = 15 ns = 17 ns Temperature range Blank I = Commercial Temp. = Industrial Temp. Power Consumption Blank L = Standard Part = Low Power Part Package Organisation Memory Type ZK LK 32256 SYS = Plastic 64 Pin ZIP = Plastic 64 Pin SIMM = 256K X 32 = Static RAM Note : Although this data is believed to be accurate, the information contained herein is not intended to and does not create any warranty of merchantibility or fitness for a particular purpose. Our products are subject to a constant process of development. Data may be changed at any time without notice. Products are not authorised for use as critical components in life support devices without the express written approval of a company director. 2