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MSM514262-80 Datasheet(PDF) 9 Page - OKI electronic componets |
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MSM514262-80 Datasheet(HTML) 9 Page - OKI electronic componets |
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9 / 45 page  ¡ Semiconductor MSM514262 9/45 Notes: 1. These parameters depend on output loading. Specified values are obtained with the output open. 2. These parameters are masured at minimum cycle test. 3. ICC2 (Max.) are mesured under the condition of TTL input level. 4. VIH (Min.) and VIL (Max.) are reference levels for measuring timing of input signals. Also, transition times are measured between VIH and VIL. 5. An initial pause of 200 ms is required after power-up followed by any 8 RAS cycles (DT/OE “high”) and any 8 SC cycles before proper divice operation is achieved. In the case of using an internal refresh counter, a minimum of 8 CAS before RAS initialization cycles in stead of 8 RAS cycles are required. 6. AC measurements assume tT = 5 ns. 7. RAM port outputs are mesured with a load equivalent to 1 TTL load and 100 pF. Output reference levels are VOH/VOL = 2.4 V/0.8 V. 8. SAM port outputs are measured with a load equivalent to 1 TTL load and 30 pF. Output reference levels are VOH/VOL = 2.0 V/0.8 V. 9. tOFF (Max.), tOEZ (Max.), tSDZ (Max.) and tSEZ (Max.) difine the time at which the outputs achieve the open circuit condition and are not reference to output voltage levels. 10. Either tRCH or tRRH must be satisfied for a read cycle. 11. These parameters are referenced to CAS leading edge of early write cycles and to WB/WE leading edge in OE controlled write cycles and read modify write cycles. 12. tWCS, tRWD, tCWD and tAWD are not restrictive operating parameters. They are included in the data sheet as electrical characteristics only. If tWCS ≥ tWCS (Min.), the cycle is an early write cycle, and the data out pin will remain open circuit (high impedance) throughout the entire cycle : If tRWD ≥ tRWD (Min.), tCWD ≥ tCWD (Min.) and tAWD ≥ tAWD (Min.) the cycle is a read-write cycle and the data out will contain data read from the selected cell : If neither of the above sets of conditions is satisfied, the condition of the data out (at access time) is indterminate. 13. Operation within the tRCD (Max.) limit ensures 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 by tCAC. 14. Operation within the tRAD (Max.) limit ensures 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. 15. Input levels at the AC parameter measurement are 3.0 V/0 V. 16. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permenent damege to the device. 17. All voltages are referenced to VSS. |
Similar Part No. - MSM514262-80 |
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Similar Description - MSM514262-80 |
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