MEMORY DATABOOK - Al Kossow's Bitsavers

--------------...:.--..... DYNAMIC RAM· MSM41256AS/RS •AC CHARACTERISTICSNotes 1, 2, 3Under RecommendedOperating conditionsParameter Symbol UnitsRefresh period tREF msRandom read or write cycle time tRC nsRead-write cycle time tRWC nsPage mode cycle time tpc nsAccess time from RAS tRAC nsAccess time from CAS tCAC nsOutput buffer turn-off delay tOFF nsTransition time tT nsRAS precharge time tRP nsRAS pulse width tRAS nsRAS hold time tRSH nsCAS precharge time tcp nsCAS pulse width tCAS nsCAS hold time tCSH nsRAS to CAS delay time tRCD ns~to RAS precharge time tCRP nsRow Address set-up time tASR nsRow Address hold time tRAH nsColumn Address set-up time tASC nsColumn Address hold time tCAH nsColumn Address hold timereferenced to R AStARRead command set-up time tRCS nsRead command hold time tRCH nsWrite command set-up time twcs nsWrote command hold time tWCH nsWrite command hold timereferenced to RAStwCRWrite command pulse width twp nsWrite command to RAS lead time tRWL nsWrite command to CAS lead time tCWL nsData-in set-up time tDS nsData-in hold time tDH nsData-in hold time referencedto'RAStDHRCAS to WE delay tCWD nsRAS to WE delay tRWD nsRead command hold timereferenced to RAStRRHnsnsnsnsMSM41256-12 MSM41256-15 MSM41 256-20Min. Max. Min. Max. Min. Max.4 4 4230 260 330255 325 410130 145 190120 150 20060 75 1000 40 0 40 0 503· 50 3 50 3 50100 100 120120 10,000 150 10,000 200 10,00060 75 10060 60 8060 10,000 75 10,000 100 10,000120 150 20025 60 25 75 30 1000 0 00 0 020 20 250 0 035 45 5595 120 1550 0 00 0 00 0 040 45 55100 120 15540 45 5540 60 8040 60 800 0 040 45 55100 120 15540 75 100100 150 20020 20 25Note4,65,67888111