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DS1337S Datasheet(PDF) 3 Page - Maxim Integrated Products |
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DS1337S Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 15 page DS1337 I 2C Serial Real-Time Clock 3 of 15 AC ELECTRICAL CHARACTERISTICS (VCC = 1.8V to 5.5V, TA = -40°C to +85°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Fast mode 100 400 SCL Clock Frequency fSCL Standard mode 0 100 kHz Fast mode 1.3 Bus Free Time Between a STOP and START Condition tBUF Standard mode 4.7 µs Fast mode 0.6 Hold Time (Repeated) START Condition (Note 10) tHD:STA Standard mode 4.0 µs Fast mode 1.3 LOW Period of SCL Clock tLOW Standard mode 4.7 µs Fast mode 0.6 HIGH Period of SCL Clock tHIGH Standard mode 4.0 µs Fast mode 0.6 Setup Time for a Repeated START Condition tSU:STA Standard mode 4.7 µs Fast mode 0 0.9 Data Hold Time (Notes 11, 12) tHD:DAT Standard mode 0 µs Fast mode 100 Data Setup Time (Note 13) tSU:DAT Standard mode 250 ns Fast mode 20 + 0.1CB 300 Rise Time of Both SDA and SCL Signals (Note 14) tR Standard mode 20 + 0.1CB 1000 ns Fast mode 20 + 0.1CB 300 Fall Time of Both SDA and SCL Signals (Note 14) tF Standard mode 20 + 0.1CB 300 ns Fast mode 0.6 Setup Time for STOP Condition tSU:STO Standard mode 4.0 µs Capacitive Load for Each Bus Line CB (Note 14) 400 pF I/O Capacitance (SDA, SCL) CI/O (Note 15) 10 pF Note 1: Limits at -40°C are guaranteed by design and are not production tested. Note 2: SCL only. Note 3: SDA, INTA, and SQW/INTB. Note 4: ICCA—SCL clocking at max frequency = 400kHz, VIL = 0.0V, VIH = VCC. Note 5: Specified with the I 2C bus inactive, V IL = 0.0V, VIH = VCC. Note 6: SQW enabled. Note 7: Specified with the SQW function disabled by setting INTCN = 1. Note 8: Using recommended crystal on X1 and X2. Note 9: The device is fully accessible when 1.8 ≤ V CC ≤ 5.5V. Time and date are maintained when 1.3V ≤ VCC ≤ 1.8V. Note 10: After this period, the first clock pulse is generated Note 11: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIHMIN of the SCL signal) to bridge the undefined region of the falling edge of SCL. Note 12: The maximum tHD:DAT need only be met if the device does not stretch the LOW period (tLOW) of the SCL signal. Note 13: A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT ≥ to 250ns must then be met. This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tR max + tSU:DAT = 1000 + 250 = 1250ns before the SCL line is released. Note 14: CB—total capacitance of one bus line in pF. Note 15: Guaranteed by design. Not production tested. |
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