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DS1808 датащи(PDF) 13 Page - Dallas Semiconductor |
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DS1808 датащи(HTML) 13 Page - Dallas Semiconductor |
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13 / 17 page ![]() DS1808 13 of 17 AC ELECTRICAL CHARACTERISTICS (-40oC to +85oC, VDD=4.5V to 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES SCL Clock Frequency fSCL Fast Mode Standard Mode 0 0 400 100 kHz 5 Bus Free Time Between STOP and START tBUF 1.3 4.7 ms 5 Hold Time (repeated) START Condition tHD:STA 0.6 4.0 ms 6, 5 Low Period of SCL Clock tLOW 1.3 4.7 ms 5 High period of SCL Clock t HIGH 0.6 4.0 ms 5 Data Hold Time tHD:DAT 0 0 0.9 ms 5,7 Data Set-Up Time tSU:DAT 100 250 ns 5 Start Set-Up Time tSU:STA 0.6 4.7 ms 5 Rise Time of Both SDA and SCL Signals tR 20+0.1 C B 300 1000 ns 8 Fall Time of Both SDA and SCL Signals tF 20+0.1 C B 300 300 ns 8 Set-Up Time for STOP Condition tSU:STO 0.6 4.0 ms Capacitive Load for Each Bus Line CB 400 pF 8 |
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