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HMD8M32M4G-5 Datasheet(PDF) 5 Page - Hanbit Electronics Co.,Ltd |
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HMD8M32M4G-5 Datasheet(HTML) 5 Page - Hanbit Electronics Co.,Ltd |
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5 / 7 page  HANBit HMD8M32M4G URL:www.hbe.co.kr - 5 - HANBit Electronics Co.,Ltd. REV.1.0 (August.2002) Column address set-up time tASC 0 0 ns Column address hold time tCAH 10 10 ns Column Address to /RAS lead time tRAL 25 30 ns Read command set-up time tRCS 0 0 ns Read command hold referenced to /CAS tRCH 0 0 ns Read command hold referenced to /RAS tRRH 0 0 ns Write command hold time tWCH 10 10 ns Write command pulse width tWP 10 10 ns Write command to /RAS lead time tRWL 15 15 ns Write command to /CAS lead time tCWL 13 15 ns Data-in set-up time tDS 0 0 ns Data-in hold time tDH 10 15 ns Refresh period tREF 64 64 ns Write command set-up time tWCS 0 0 ns /CAS setup time (C-B-R refresh) tCSR 5 5 ns /CAS hold time (C-B-R refresh) tCHR 10 10 ns /RAS precharge to /CAS hold time tRPC 5 5 ns Access time from /CAS precharge tCPA 30 35 ns Fast page mode cycle time tPC 35 45 ns /CAS precharge time (Fast page) tCP 10 10 ns /RAS pulse width (Fast page ) tRASP 50 200K 60 200K ns /W to /RAS precharge time (C-B-R refresh) tWRP 10 10 ns /W to /RAS hold time (C-B-R refresh) tWRH 10 10 ns /CAS precharge(C-B-R counter test) tCPT 20 30 ns NOTES 1.An initial pause of 200 µs is required after power-up followed by any 8 /RAS-only or /CAS-before-/RAS refresh cycles before proper device operation is achieved. 2.VIH (min) and VIL (max) are reference levels for measuring timing of input signals. Transition times are measured between VIH(min) and VIL(max) and are assumed to be 5ns for all inputs. 3.Measured with a load equivalent to 1TTL loads and 100pF 4.Operation within the tRCD(max) limit insures that tRAC(max) can be met. tRCD(max) is specified as a reference point only. If tRCD is greater than the specified tRCD(max) limit, then access time is controlled exclusively by tCAC. 5.Assumes that tRCD ≥ tRCD(max) 6. tAR, tWCR, tDHR are referenced to tRAD(max) 7.This parameter defines the time at which the output achieves the open circuit condition and is not referenced to VOH or VOL. 8. tWCS, tRWD, tCWD and tAWD are non restrictive operating parameter. They are included in the data sheet as electrical characteristic only. If tWCS ≥ tWCS(min) the cycle is an early write cycle and the data out pin will remain high impedance for the duration of the cycle. 9. Either tRCH or tRRH must be satisfied for a read cycle. 10. These parameters are referenced to the /CAS leading edge in early write cycles and to the /W leading edge in read- write cycles. 11. Operation within the tRAD(max) limit insures that tRAC(max) can be met. tRAD(max) is specified as a reference point only. If tRAD is greater than the specified tRAD(max) limit. then access time is controlled by tAA. |
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