 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| DESCRIPTION Accutek Microcircuit Corporation AK491024S / AK491024G 1,048,576 Word x 9 Bit CMOS Dynamic Random Access Memory Front View 30-Pin SIM The Accutek AK491024 high density memory module is a random access memory organized in 1 Meg x 9 bit words. The assembly consists of nine standard 1 Meg x 1 DRAMs in plastic leaded chip carriers (SOJ) mounted on 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 6 to 1 density increase over standard DIP packaging. The operation of the AK491024 is identical to nine 1 Meg x 1 DRAMs. For the lower eight bits data input is tied to the data output and brought out separately for each device, with common RAS, CAS control. This common I/O feature 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 the data output (Q9) pins are brought out separately and controlled by a separate PCAS for that bit. Bit nine is generally used for parity. 1 30 30-Pin SIP 1 FEATURES * 1,048,576 x 9 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 and RAS control for the lower eight bits * Separate PCAS control for D9 and Q9 * CAS-before-RAS refresh * Power 3.465 Watt Max Active (80 nSEC) 2.97 Watt Max Active (100 nSEC) 2.475 Watt Max Active (120 nSEC) 49.5 mW Max Standby * Operating free air temperature 00C to 700C * Upward compatible with AK594096 and AK5916384 * Downward compatible with AK49256 PIN NOMENCLATURE DQ1 - DQ8 D9 Q9 A0 - A9 CAS, PCAS RAS WE Vcc Vss NC Data In / Data Out Data In 9 Data Out 9 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 A9 NC DQ6 WE Vss DQ7 NC DQ8 Q9 RAS PCAS D9 Vcc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 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 MODULE OPTIONS Leadless SIM: AK491024S Leaded SIP: AK491024G Position 1 2 ORDERING INFORMATION PART NUMBER CODING INTERPRETATION 1 2 3 4 5 6 7 8 MECHANICAL DIMENSIONS Inches 3 4 5 6 7 8 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 0.815 0.785 0.425 0.375 .100 .060 0.100 TYP 0.815 0.785 0.325 0.275 1 1 0.100 TYP 3.100 3.090 3.525 3.475 0.024 0.016 30 0.053 0.047 0.200 MAX 0.100 TYP 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: AK491024SP-80 1 Meg x 9, 80 nSEC DRAM 30 pin SIM Configuration, Page Mode AK491024GN-70 1 Meg x 9, 70 nSEC Dram 30 pin SIP Configuration, Nibble Mode 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: accutek@seacoast.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. |
Price & Availability of AK491024GP-12
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |