MEMORY DATABOOK - Al Kossow's Bitsavers

• DYNAMIC RAM· MSM41256AAS/RS .---------------AC CHARACTERISTICS(Recommended operating conditions unless otherwise noted.) Note 1,2,3Parameter Symbol UnitMSM41256A- MSM41256A- MSM41256A-10 12 15Min. Max. Min. Max. Min. Max.NotesRefresh period tREF ms 4 4 4Random read or writecycle timetRC ns 200 220 260Read-write cycle time tRWC ns 200 220 260Access time from RAS tRAC ns 100 120 150 4,6Access time from CAS tCAC ns 50 60 75 5,6Output buffer turn-offdelaytOFF ns 0 30 0 30 0 30Transition time tT ns 3 50 3 50 3 50RAS precharge time tRP ns 85 90 100RAS pulse width tRAS ns 105 1 OILS 120 1 OILS 150 1 OILSRAS hold time tRSH ns 55 60 75CAS pulse width tCAS ns 55 1 OILS 60 1 OILS 75 1 OILSCAS hold time tCSH ns 105 120 150RAS to CAS delay time tRCD ns 25 50 25 60 25 75 7CAS to RAS set-up time tCRS ns 20 20 20Row address set-uptimetASR ns 0 0 0Row address hold time tRAH ns 15 15 15Column address set-uptimeColumn address holdtimeRead command set-uptimeRead command holdtime referenced to CASRead command holdtime referenced to RASWrite command set-uptimetASC ns 0 0 0tCAH ns 20 20 25tRCS ns 0 0 0tRCH ns 0 0 0tRRH ns 20 20 20twcs ns 0 0 0 8136