memory products - Al Kossow's Bitsavers

MK48Z08/18/09/19(B)-15/20/25OPERATIONRead ModeThe MK48Z08118/09119 is in the Read Modewhenever W (Write Enable) is high, E, (Chip Enable)is low, and E2 is high (MK48Z09/19), providinga ripple-through access of data from eight of 65,536locations in the static storage array. Thus, theunique address specified by the 13 Address Inputs(An) defines which one of 8,192 bytes of data is tobe accessed.Valid data will be available to the eight data OutputDrivers within tM after the last address input sig­!lal is stable, providing that the Chip Enable al1.QG access times are satisfied. If Chip Enable or Gaccess times are not met, data access will be measuredfrom the limiting parameter (tOEA or tCEA' ortCE'w, rather than the address. The state of theeight Data 1/0 signals is controlled by the Chip Enableand G control signals. The data linesmay be inan indeterminate state between tOH and tM , butthe data lines will always have valid data at tM .FIGURE 3. READ CYCLEE,READ CYCLEAC ELECTRICAL CHARACTERISTICS:O°C:5TA:5+70°C) (Vcc (min):5Vcc :5Vcc (max»MK48ZXX-15 MK48ZXX-20 MK48ZXX-2SSYM PARAMETER MIN MAX MIN MAX MIN MAX UNITS NOTESt RC Read Cycle Time 150 - 200 - 250 - nstM Address Access Time - 150 - 200 - 250 nstCEA1 E, Access Time - 150 - 200 - 250 nstCEA2 E2 Access Time - 150 - 200 - 250 nstOEA Output Enable to Output Valid - 75 - 100 - 125 nstCEL Chip Enable (E" E2) to 10 - 10 - 15 - nsOutput In Low-ZtOEL Output Enable to Output Low-Z 5 - 5 - 10 - nstCEZ Chip Enable (E" E 2) - 75 - 100 - 125 nsOutput In High-ZtOEZ Output Enable to Output High-Z - 60 - 80 - 100 nstOH Output Data Hold Time 20 - 20 - 25 - ns3/12315