memory products - Al Kossow's Bitsavers

MK4501 (N, K)-65/80/10/12/15/20RESETThe MK45Q!Js reset (see Figure 5) whenever theReset pin (RS) is in the low state. During a Reset,both the internal read and write pOinters are set tothe first location. Reset is required after power up,before a Write operation can begin.FIGURE 5 RESETAlthough neither W or R need be high when RSgoes low, both Wand R must be high tRSS beforeRS goes high, and must remain hightRSR afterwards. Refer to the fo"o~ng discussionfor the required state of FURT and XI during Reset.IRS~\ I--dlASSI~ ~I~w~I I~R~IRse·1-I,~~ }-x xx .xxxxxxxxxxxx xxx.. xxxx~EF ~xxxxxx xx.xx .xxx." xxx»"x xxxxxxxxxmNOTE~ and FF may change status during Reset,but flags will be valid at IRse'AC ELECTRICAL CHARACTERISTICS(O°C:sTA:s +70°C) (Vee = +5.0 volts ± 10%)4501·65 4501·80SYM PARAMETER MIN MAX MIN MAXtRse Reset Cycle Time 80 100t RS Reset Pulse Width 65 80t RSR Reset Recovery Time 15 20tRSS Reset Set Up Time 45 604501·10 4501·12 4501-15 4501-20MIN MAX MIN MAX MIN MAX MIN MAX UNITS120 140 175 235 ns100 120 150 200 ns20 20 25 35 ns80 100 130 180 nsNOTES16/15402