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M48T59Y-70PC1F Datasheet(PDF) 10 Page - STMicroelectronics |
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M48T59Y-70PC1F Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 32 page Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Operation modes M48T59, M48T59Y, M48T59V 10/32 2.2 Write mode The M48T59/Y/V is in the WRITE Mode whenever W and E are low. The start of a WRITE is referenced from the latter occurring falling edge of W or E. A WRITE is terminated by the earlier rising edge of W or E. The addresses must be held valid throughout the cycle. E or W must return high for a minimum of tEHAX from Chip Enable or tWHAX from WRITE Enable prior to the initiation of another READ or WRITE cycle. Data-in must be valid tDVWH prior to the end of WRITE and remain valid for tWHDX afterward. G should be kept high during WRITE cycles to avoid bus contention; however, if the output bus has been activated by a low on E and G a low on W will disable the outputs tWLQZ after W falls. Figure 6. Write enable controlled, write mode AC waveforms Figure 7. Chip enable controlled, write mode AC waveforms AI01386 tAVAV tWHAX tDVWH DATA INPUT A0-A12 E W DQ0-DQ7 VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tWHDX tWHQX AI01387B tAVAV tEHAX tDVEH A0-A12 E W DQ0-DQ7 VALID tAVEH tAVEL tAVWL tELEH tEHDX DATA INPUT |
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