AK59256AS / AK59256AG 262,144 Word by 9 bit, CMOS Dynamic Random Access Memory ACCUTEK MICROCIRCUIT CORPORATION Front View DESCRIPTION The Accutek AK59256A high density memory modules is a random access memory organized in 256K x 9 bit words. The assembly consists of two 256K x 4 and one 256K x 1 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 AK59256A is identical to two 256K x 4 DRAMs plus one 256K x 1 DRAM. For the lower eight bits data input is tied to data output and 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. For the ninth bit, the data input (D9) and data output (Q9) pins are brought out separately and controlled by a separate PCAS for that bit. Bit nine is generally used for parity. FEATURES · 262,144 x 9 bit organization · Optional 30 Pad SIM (Single In-Line Module) or 30 Pin leaded SIP (Single In-Line Package) · JEDEC standard pinout · Common CAS, RAS and WE control for the lower eight bits · Separate PCAS control for D9 and Q9 PIN NOMENCLATURE 30-Pin SIM + 30-Pin SIP + · Power: 1.26 Watt Max Active (70 nSEC) 1.10 Watt Max Active (80 nSEC) .935 Wat Max Active (100 nSEC) 22 mWatt Standby (Max) · Operating free air temperature: 0o to 70oC · Upward compatible with AK491024, AK591024, AK594096 and AK5916384 · Functionally and Pin compatible with AK49256 · Available with access times of 60 nSEC to 100 nSEC PIN ASSIGNMENT FUNCTIONAL DIAGRAM SYMBOL PIN # SYMBOL Vcc 16 DQ5 Data In 2 CAS 17 A8 Data Out 3 DQ1 18 NC 4 A0 19 NC 5 A1 20 DQ6 WE D9 Q9 A0 - A9 Address Inputs CAS, PCAS Column Address Strobe 6 DQ2 21 RAS Row Address Strobe 7 A2 22 Vss 8 A3 23 DQ7 WE Write Enable 9 Vss 24 NC Vcc 5v Supply 10 DQ3 25 DQ8 Vss Ground 11 A4 26 Q9 NC No Connect MODULE OPTIONS + 1 1 Data In / Data Out 30 1 PIN # DQ1 - DQ8 + 12 A5 27 RAS 13 DQ4 28 PCAS 14 A6 29 D9 15 A7 30 Vcc A0 - A8 + RAS + CAS + WE + DQ1 + DQ2 + DQ3 + DQ4 + A0 - A8 * RAS * CAS * WE * DQ1 * DQ2 * DQ3 * DQ4 OE * + + + + A0 - A8 * RAS * CAS * WE * DQ1 * DQ2 * DQ3 * DQ4 OE * DQ5 DQ6 DQ7 DQ8 PCAS + Leadless SIM: AK59256AS A0 - A8 * RAS * CAS * WE Leaded SIP: AK59256AG D9 + Q9 + *D Q * MECHANICAL DIMENSIONS ORDERING INFORMATION PART NUMBER CODING INTERPRETATION Position 1 2 3 6 Inches 7 8 0.410 0.390 0.260 0.240 0.085 0.075 0.325 0.275 1 + + 1 0.100 T.P. 3.510 3.490 3.245 3.225 3.110 3.090 30 + + 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 50 = 50 nS 8 = 8 nS 60 = 60 nS 10 = 10 nS 70 = 70 nS 12 = 12 nS 80 = 80 nS 15 = 15 nS 0.024 0.016 8 5 0.100 T.P. 7 4 0.505 0.495 6 3 0.100 TYP 5 2 0.515 0.505 4 1 0.100 TYP 0.200" MAX 0.053 0.047 The numbers and coding on this page do not include all variations available but are show as examples of the most widely used variations. Contact Accutek if other information is required. EXAMPLES: AK59256AGP-60 256K x 9, 60 nSEC, DRAM, SIP Configuration, 30 Pin, Page Mode AK59256ASP-70 256K x 9, 70 nSEC, DRAM, SIM Configuration, 30 Pin, Page Mode ACCUTEK MICROCIRCUIT CORPORATION 5 NEW PASTURE ROAD NEWBURYPORT, MA 01950-4040 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.