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AK444096D Datasheet(PDF) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
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AK444096D Datasheet(HTML) 1 Page - ACCUTEK MICROCIRCUIT CORPORATION |
1 / 2 page DESCRIPTION The Accutek AK48256 high density memory modules is a random access memory organized in 256K x 8 bit words. The assembly consists of eight standard 256K x 1 DRAMs in plastic leaded chip carriers (PLCC) 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 AK48256 is identical to eight 256K x 1 DRAMs. The data input is tied to the data output and brought out separately for each device, with common RAS, CAS and WE 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 al- ways go low before CAS in a write cycle, Read-Write and Read-Modify-Write operation is not possible. FEATURES · 262,144 by 8 bit organization · Optional 30 Pad leadless SIM (Single In-Line Module) or 30 Pin leaded SIP (Single In-Line Package) · JEDEC standard pinout · Each device has common D and Q lines with common RAS, CAS and WE control · 2.8 Watt active and 180 mW standby (max) · Operating free air temperature 0 0Cto700C · Upward compatible with AK481024, AK581024, AK584096 and AK5816384 · Functionally and Pin compatible with AK58256A Accutek Microcircuit Corporation AK48256S / AK48256G 262,144 X 8 Bit MOS Dynamic Random Access Memory 1 30 1 Front View 30-Pin SIM 30-Pin SIP PIN NOMENCLATURE A0 -A8 Address Inputs DQ1 -DQ8 Data In / Data Out CAS Column Address Strobe RAS Row Address Strobe WE Write Enable Vcc 5v Supply Vss Ground NC No Connect MODULE OPTIONS Leadless SIM: AK48256S Leaded SIP: AK48256G PIN ASSIGNMENT PIN # SYMBOL PIN # SYMBOL 1 Vcc 16 DQ5 2 CAS 17 A8 3 DQ! 18 NC 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 NC 12 A5 27 RAS 13 DQ4 28 NC 14 A6 29 NC 15 A7 30 Vcc FUNCTIONAL DIAGRAM |
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