1 - Al Kossow's Bitsavers

TMS446465,536-WORD 8Y 4-81T DYNAMIC RAMpage-modePage-mode operation allows effectively faster memory access by keeping the same row address and strobing randomcolumn addresses onto the chip. Thus, the time required to setup and strobe sequential row addresses for the samepage is eliminated. The maximum number of columns that can be addressed is determined by tw(RL), the maximumRAS low pulse width. For example, with a minimum cycle time (tc(P) = 110 ns) approximately 90 of the 256 columnscan be accessed.power-upTo achieve proper device operation, an initial pause of 200 p.s is required after power-up followed by a minimum ofeight initialization cycles.logic symboltRAM 64K X 4(14)AO2008/2100(13)A1A2 (12)A3 (11) 0(8) A--A4 65535A5 (7)(6)A6(10)A7RAS (5)CAS (16)W (4)G (1)OQ1 (2)OQ2 (3)OQ3 (15)OQ4 (17)23C22A.Z26t/)Q)(,)oSQ)C....~0c..c..:::sen>-~0EQ)~"CCro~-Ct This symbol is in accordance with IEEE Std 91/ANSI Y32.14 and recent decisions by IEEE and IEC. See explanation on page 10-1.TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS. TEXAS 752654-109