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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87413 датащи(PDF) 241 Page - National Semiconductor (TI) |
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PC87413 датащи(HTML) 241 Page - National Semiconductor (TI) |
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241 / 257 page  11.0 Device Characteristics (Continued) Revision 1.2 241 www.national.com 11.5.3 Clock Timing High Frequency Clock Timing . Figure 60. External High Frequency Clock Timing Symbol Clock Input Parameter CLKIN (48 MHz) Min Typ Max Unit tCH Clock High Pulse Width2 8.2 ns tCL Clock Low Pulse Width2 8.2 ns tCP Clock Period2 (50%-50%) 20 20.83 21.5 ns tCR Clock Rise Time2 (20%-80%) 2.5 ns tCF Clock Fall Time2 (80%-20%) 2.5 ns Symbol Clock Output Parameter HFCKOUT (48 MHz) HFCKOUT (40 MHz) Min Typ Max Min Typ Max Unit tCH Clock High Pulse Width1,4 1. CL = 15 pF. 8.2 10.3 ns tCL Clock Low Pulse Width1,4 8.2 10.3 ns tCP Clock Period2 (50%-50%) 2. Not tested. Guaranteed by design. t48TYP − 32KTOL 3 − 50ppm 3. t32KCLKIN tolerance. 20.83 t48TYP + 32KTOL 3 + 50ppm t40TYP − 32KTOL 3 − 150ppm 25 t40TYP + 32KTOL 3 + 150ppm ns tCR Clock Rise Time4 (20%-80%) 4. Not tested. Guaranteed by characterization. CL = 15 pF 2.5 2.5 ns CL =40pF 5 5 ns tCF Clock Fall Time4 (80%-20%) CL = 15 pF 2.5 2.5 ns CL =40pF 5 5 ns VIL VIL VIH VIH CLKIN tCL tCP tCH HFCKOUT |
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