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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87309VLJ датащи(PDF) 186 Page - National Semiconductor (TI) |
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PC87309VLJ датащи(HTML) 186 Page - National Semiconductor (TI) |
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186 / 192 page  Device Specifications 186 www.national.com 10.3.18 Enhanced Parallel Port 1.7 Timing 1. The PC87309 design guarantees that WRITE will not change from low to high before DSTRB, or ASTRB, goes from low to high. 2. D7-0 is stable 15 nsec before WR becomes active. Symbol Parameter Min Max Unit tWW17 WRITE Active or Inactive from WR Active or Inactive 45 nsec tWST17 DSTRB or ASTRB Active or Inactive from WR or RD Active or Inactive1 45 nsec tWEST17 DSTRB or ASTRB Active after WRITE Becomes Active 0 nsec tWPD17h PD7-0 Hold after WRITE Becomes Inactive 50 nsec tHRW17 IOCHRDY Active or Inactive after WAIT Becomes Active or Inactive 40 nsec tWPDS17 PD7-0 Valid after WRITE Becomes Active2 15 nsec tEPDW17 PD7-0 Valid Width 80 nsec tEPD17h PD7-0 Hold after DSTRB or ASTRB Becomes Inactive 0 nsec tZWS17a ZWS Valid after WR or RD Active 45 nsec tZWS17h ZWS Hold after WR or RD Inactive 0 nsec tWW17 WR RD D7-0 WRITE DSTRB ASTRB PD7-0 WAIT IOCHRDY Valid Valid tWEST17 tWST17 tWPDS17 tHRW17 tHRW17 tWST17 tWW17 tWST17 tWPD17h tWST17 tEPD17h tEPDW17 or tHRW17 tZWS17a tZWS17h tZWS17a tZWS17h ZWS |
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