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AK491024S Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
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AK491024S Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
1 / 2 page DESCRIPTION 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 in- crease 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. 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 0 0Cto700C · Upward compatible with AK594096 and AK5916384 · Downward compatible with AK49256 Accutek Microcircuit Corporation AK491024S / AK491024G 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 9 Q9 Data Out 9 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: AK491024S Leaded SIP: AK491024G 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 |
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