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| Accutek Microcircuit Corporation DESCRIPTION The Accutek AK58256AG/AS high density memory module is a random access memory organized in 256K x 8 bit words. The assembly consists of two 256K x 4 DRAMs in surface mount packages mounted to the front side of a printed circuit board. The module can be configured as a leadless 30 pad SIM or a leaded 30 pin SIP. This packaging approach provides a better than 6 to 1 density increase over standard DIP packaging. The operation of the AK58256 is identical to two 256K x 4 DRAMs. The data input/output is brought out separately for each 256K x 4 device, with common RAS, CAS and WE control. The OE pins are tied to Vss which dictates the use of early-write cycles to prevent contention of D and Q. Since the Write-Enable (WE) signal must always go low before CAS in a write cycle, Read-Write and Read-Modify-Write operation is not possible. AK58256AG / AK58256AS 262,144 x 8 bit CMOS Dynamic Random Access Memory Front View 30-Pin SIM + 1 + 30 30-Pin SIP + 1 + FEATURES * 262,144 x 8 bit organization * Optional 30 Pad leadless SIM (Single In-Line Module) or 30 Pin leaded SIP (Single In-Line Package) * JEDEC standard pinout * Common CAS, RAS and WE control for eight DQ lines * Separate CAS control for one separate pair of D and Q lines * 1024 refresh cycles/16ms, A0 to A8 * Power: .99 Watt Max Active (60 nS) .88 Watt Max Active (70 nS) .77 Watt Max Active (80 nS) .65 Watt Max Active (100 nS) 11 mWatt standby (max) * Operating free air temperature: 00 to 700C * Upward compatible with AK581024, AK584096 and AK5816384 * Functionally and Pin compatible with AK48256 * Available with access times of 60 to 100 nS PIN NOMENCLATURE DQ1 - DQ8 A0 - A8 CAS RAS WE Vcc Vss NC Data In / Data Out Address Inputs Column Address Strobe Row Address Strobe Write Enable 5v Supply Ground No Connect PIN ASSIGNMENT PIN # SYMBOL PIN # SYMBOL FUNCTIONAL DIAGRAM DQ5 A8 NC NC DQ6 WE Vss DQ7 NC DQ8 NC RAS NC NC Vcc 1 2 3 4 5 6 7 8 9 10 11 Vcc CAS DQ1 A0 A1 DQ2 A2 A3 Vss DQ3 A4 A5 DQ4 A6 A7 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 A0 - A8 + RAS + CAS + WE + DQ1 + DQ2 + DQ3 + DQ4 + A0 - A8 * RAS * CAS * WE * DQ1 * DQ2 * DQ3 * DQ4 OE * MODULE OPTIONS Leadless SIM: AK58256AS Leaded SIP: AK58256AG 12 13 14 15 DQ5 DQ6 DQ7 DQ8 + + + + A0 - A8 * RAS * CAS * WE * DQ1 * DQ2 * DQ3 * DQ4 OE * 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 60 = 60 nS 8 = 8 nS 70 = 70 nS 12 = 12 nS 80 = 80 nS 15 = 15 nS 10 = 100 nS 20 = 20 nS 12 = 120 nS 70 = 70 nS 15 = 150 nS 85 = 85 nS 1 2 3 4 5 6 7 8 EXAMPLES: AK58256ASP-60 256K x 8, Dynamic RAM, Leadless SIM, Page Mode, Commercial, 60 nSEC Access Time AK58256AGK-70 256K x 8, Dynamic RAM, Leaded SIP, Static Column Mode Commercial, 70 nSEC AccessTime MECHANICAL DIMENSIONS Inches 3 4 0.515 0.505 5 0.410 0.390 0.260 0.240 0.085 0.075 0.100 TYP 0.505 0.495 0.325 0.275 6 + 0.100 T.P. + 1 1 7 0.100 T.P. 3.110 3.090 3.245 3.225 3.510 3.490 8 0.024 0.016 + + 0.100 TYP 30 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. 0.200" MAX 0.053 0.047 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. |
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