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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M48T58 датащи(PDF) 12 Page - STMicroelectronics |
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M48T58 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 27 page  M48T58, M48T58Y 12/27 WRITE Mode The M48T58/Y is in the WRITE Mode whenever W and E1 are low and E2 is high. The start of a WRITE is referenced from the latter occurring fall- ingedgeof W or E1, or the rising edge of E2. A WRITE is terminated by the earlier rising edge of W or E1, or the falling edge of E2. The addresses must be held valid throughout the cycle. E1 or W must return high or E2 low for a minimum of tE1HAX or tE2LAX 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 af- terward. G should be kept high during WRITE cy- cles to avoid bus contention; although, if the output bus has been activated by a low on E1 and G and a highonE2, a low on W will disable the outputs tWLQZ after W falls. Figure 9. WRITE Enable Controlled, WRITE AC Waveform AI00963 tAVAV tWHAX tDVWH DATA INPUT A0-A12 E1 W DQ0-DQ7 VALID E2 tAVWH tAVE1L tAVE2H tWLWH tAVWL tWLQZ tWHDX tWHQX |
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