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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DS87C520 датащи(PDF) 33 Page - Dallas Semiconductor |
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DS87C520 датащи(HTML) 33 Page - Dallas Semiconductor |
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33 / 45 page  DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers 33 of 45 MOVX CHARACTERISTICS VARIABLE CLOCK PARAMETER SYMBOL MIN MAX UNITS STRETCH 1.5tCLCL-5 tMCS=0 Data Access ALE Pulse Width tLHLL2 2tCLCL-5 ns tMCS>0 0.5tCLCL-5 tMCS=0 Port 0 Address Valid to ALE Low tAVLL2 tCLCL-5 ns tMCS>0 0.5tCLCL-10 tMCS=0 Address Hold after ALE Low for MOVX Write tLLAX2 tCLCL-7 ns tMCS>0 2tCLCL-5 tMCS=0 RD Pulse Width tRLRH tMCS-10 ns tMCS>0 2tCLCL-5 tMCS=0 WR Pulse Width tWLWH tMCS-10 ns tMCS>0 2tCLCL-22 tMCS=0 RD Low to Valid Data In tRLDV tMCS-24 ns tMCS>0 Data Hold After Read tRHDX 0 ns — tCLCL-5 tMCS=0 Data Float after Read tRHDZ 2tCLCL-5 ns tMCS>0 2.5tCLCL-31 tMCS=0 ALE Low to Valid Data In tLLDV tMCS+tCLCL-26 ns tMCS>0 3tCLCL-29 tMCS=0 Port 0 Address to Valid Data In tAVDV1 tMCS+2tCLCL- 29 ns tMCS>0 3.5tCLCL-37 tMCS=0 Port 2 Address to Valid Data In tAVDV2 tMCS+2.5tCLCL- 37 ns tMCS>0 0.5tCLCL-10 0.5tCLCL+5 tMCS=0 ALE Low to RD or WR Low tLLWL tCLCL-5 tCLCL+5 ns tMCS>0 tCLCL-9 tMCS=0 Port 0 Address to RD or WR Low tAVWL1 2tCLCL-7 ns tMCS>0 1.5tCLCL-17 tMCS=0 Port 2 Address to RD or WR Low tAVWL2 2.5tCLCL-16 ns tMCS>0 Data Valid to WR Transition tQVWX -6 ns — tCLCL-5 tMCS=0 Data Hold after Write tWHQX 2tCLCL-6 ns tMCS>0 RD Low to Address Float tRLAZ (Note 1) ns — -4 10 tMCS=0 RD or WR High to ALE High tWHLH tCLCL-5 tCLCL+5 ns tMCS>0 Note 1: tMCS is a time period related to the Stretch memory cycle selection. The following table shows the value of tMCS for each Stretch selection. |
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