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AK5916384 Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
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AK5916384 Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
1 / 2 page DESCRIPTION The Accutek AK591024 high density memory modules is a random access memory organized in 1 Meg x 9 bit words. The assembly consists of two 1 Meg x 4 and one 1 Meg x 1 DRAMs in surface mount packages 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 better than 6 to 1 density increase over standard DIP packaging. The operation of the AK591024 is identical to two 1 Meg x 4 plus one 1 Meg x 1 DRAMs. For the lower eight bits, the data input is tied to data output and brought out separately for each 1 Meg 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 conten- tion 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 · 1,048,576 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 · 1024 refresh cycles/16ms · Separate PCAS control for D9 and Q9 · Power: 1.650 Watt Max Active (60 nS) 1.485 Watt Max Active (70 nS) 1.265 Watt Max Active (80 nS) 23.5 mWatt Standby (max) · Operating free air temperature: 0 o to 70oC · Upward compatible with and AK594096 and AK5916384 · Downward compaitble with AK59256 · Functionally and Pin compatible with AK491024 Accutek Microcircuit Corporation AK591024AS / AK591024AG 1,048,576 Word X 9 bit, CMOS Dynamic Random Access Memory 1 30 + + 1 ++ Front View 30-Pin SIM 30-Pin SIP PIN NOMENCLATURE DQ1 -DQ8 Data In / Data Out D9 Data In Q9 Data Out A0 -A9 Address Inputs CAS, PCAS Column Address Strobe RAS Row Address Strobe WE Write Enable Vcc 5v Supply Vss Ground NC No Connect MODULE OPTIONS Leadless SIM: AK591024ASP Leaded SIP: AK591024AGP PIN ASSIGNMENT PIN # SYMBOL PIN # SYMBOL 1 Vcc 16 DQ5 2 CAS 17 A8 3 DQ1 18 A9 4A0 19 NC 5 A1 20 DQ6 6 DQ2 21 WE 7 A2 22 Vss 8 A3 23 DQ7 9 Vss 24 NC 10 DQ3 25 DQ8 11 A4 26 Q9 12 A5 27 RAS 13 DQ4 28 PCAS 14 A6 29 D9 15 A7 30 Vcc FUNCTIONAL DIAGRAM * A- A DQ1 DQ2 DQ3 DQ4 09 RAS CAS WE OE * * * A- A DQ1 DQ2 DQ3 DQ4 09 RAS CAS WE OE * * * A- A D 09 RAS CAS WE Q * * * + WE + + CAS RAS A- A 09 + * * * * + + + + * * * + + + * + * + * + DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 DQ8 D9 Q9 * + PCAS 10 |
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