memory products - Al Kossow's Bitsavers

MK4503(N, K)-50/65/80/1 0/12115/20When in Depth Expansion mode, a given MK4503will begin writing and reading as soon I!L validWRITE and READ signals begin, provided FL wasgrounded at RESET time. A MK4503 in Depth Expansionmode with FL high at RESET will not beginwriting until after an Expansion In pulse occurs.It will not begin reading until a second ExpansionIn pulse occurs and the Empty Flag has gone high.Expansion In pulses must occur t XIS before theWRITE and READ signals they are intended to enable.Minimum Expansion In pulse width, t XI ' andrecovery time, t XIR, must be observed.FIGURE 12. EXPANSION IN TIMINGXiVi'\[IXI~IXIS--\-I-IWRITE TOFIRST PHYSICALLOCATIONIXIA===J'\[.-READ\-IFROMFIRST PHYSICALLOCATION;-AC ELECTRICAL CHARACTERISTICS(O°CsTAs +70°C) (Vce = +5.0 volts ± 10%)SYM PARAMETERtXItXIRtXls4503·50 4503·65 4503·80MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX ~NITS NOTESExpansion In PulseWidth 45 60 75Expansion In RecoveryTime 15 15 20Expansion In SetupTime 20 25 304503·10 4503·12 4503·15 4503·2095 115 145 195 ns 120 20 25 35 ns45 50 60 85 ns12/16424