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HYB514175BJ-50- Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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HYB514175BJ-50- Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
9 / 22 page HYB 514175BJ-50/-55/-60 256k × 16 EDO-DRAM Semiconductor Group 9 1998-10-01 Notes 1. All voltages are referenced to V SS. 2. I CC1, ICC3, ICC4 and ICC6 depend on cycle rate. 3. I CC1 and ICC4 depend on output loading. Specified values are obtained with the output open. 4. Address can be changed once or less while RAS = V IL. In case of ICC4 it can be changed once or less during a hyper page mode (EDO) cycle 5. An initial pause of 200 µs is required after power-up followed by 8 RAS cycles of which at least one cycle has to be a refresh cycle, before proper device operation is achieved. In case of using the internal refresh counter, a minimum of 8 CAS-before-RAS initialization cycles instead of 8 RAS cycles are required. 6. AC measurements assume t T = 2 ns. 7. V IH (MIN.) and VIL (MAX.) are reference levels for measuring timing of input signals. Transition times are also measured between V IH and VIL. 8. Measured with the specified current load and 100 pF at V OL = 0.8 V and VOH = 2.0 V. Access time is determined by the latter of t RAC, tCAC, tAA , tCPA , tOEA. tCAC is measured from tristate. 9. Operation within the t RCD (MAX.) limit ensures that tRAC (MAX.) can be met. tRCD (MAX.) is specified as a reference point only. If t RCD is greater than the specified tRCD (MAX.) limit, then access time is controlled by t CAC. 10.Operation within the t RAD (MAX.) limit ensures that tRAC (MAX.) can be met. tRAD (MAX.) is specified as a reference point only. If t RAD is greater than the specified tRAD (MAX.) limit, then access time is controlled by t AA. 11.Either t RCH or tRRH must be satisfied for a read cycle. 12. t OFF (MAX.), tOEZ (MAX.) define the time at which the output achieves the open-circuit conditions and are not referenced to output voltage levels. t OFF is referenced from the rising edge of RAS or CAS, whichever occurs last. 13.Either t DZC or tDZO must be satisfied. 14.Either t CDD or tODD must be satisfied. 15. t WCS, tRWD, tCWD and tAWD are not restrictive operating parameters. They are included in the data sheet as electrical characteristics only. If t WCS > tWCS (MIN.), the cycle is an early write cycle and data out pin will remain open-circuit (high impedance) through the entire cycle; if t RWD > tRWD (MIN.), tCWD > tCWD (MIN.) and tAWD > tAWD (MIN.), the cycle is a read-write cycle and I/O will contain data read from the selected cells. If neither of the above sets of conditions is satisfied, the condition of I/O (at access time) is indeterminated. 16.These parameters are referenced to the CAS leading edge in early write cycles and to the WE leading edge in read-write cycles. |
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