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DS1855 Datasheet(PDF) 14 Page - Dallas Semiconductor |
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DS1855 Datasheet(HTML) 14 Page - Dallas Semiconductor |
14 / 20 page DS1855 14 of 20 AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C, VCC = 2.7V to 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES SCL Clock Frequency fSCL Fast Mode Standard Mode 0 0 400 100 kHz 4 Bus Free Time Between STOP and START t BUF Fast Mode Standard Mode 1.3 4.7 ms 4 Hold Time (repeated) START Condition t HD:STA Fast Mode Standard Mode 0.6 4.0 ms 4,5 Low Period of SCL Clock t LOW Fast Mode Standard Mode 1.3 4.7 ms 4 High Period of SCL Clock t HIGH Fast Mode Standard Mode 0.6 4.0 ms 4 Data Hold Time t HD:DAT Fast Mode Standard Mode 0 0 0.9 0.9 ms 4,6 Data Set-Up Time t SU:DAT Fast Mode Standard Mode 100 250 ns 4 Start Set-Up Time t SU:STA Fast Mode Standard Mode 0.6 4.7 ms 4 Rise Time of Both SDA and SCL Signals t R Fast Mode Standard Mode 20+0.1CB 300 1000 ns 4 Fall Time of Both SDA and SCL Signals t F Fast Mode Standard Mode 20+0.1CB 300 300 ns 7 Set-Up Time for STOP Condition t SU:STO Fast Mode Standard Mode 0.6 4.0 ms Capacitive Load for Each Bus Line C B 400 pF 7 EEPROM Write Time TW 2.5 10 ms 8 NONVOLATILE MEMORY CHARACTERISTICS PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS Writes +85°C 50,000 |
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