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MAX31790 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX31790 Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 43 page  I2C AC Electrical Characteristics (continued) (VCC = +3.0V to +5.5V, TA = -40°C to +125°C, timing referenced to VIL(MAX) and VIH(MIN), unless otherwise noted.) (Notes 3, 8) (Figure 1) Note 2: All voltages referenced to ground. Currents entering the IC are specified as positive. Note 3: Limits are 100% production tested at TA = +25°C and/or TA = +85°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Typical values are not guaranteed. Note 4: SDA = SCL = VCC, PWM active with PWM_FREQUENCY = 25kHz. Note 5: The watchdog timer is derived from fTOSC and the watchdog timer accuracy specifications do not include the oscillator’s associated error fERR:TOSC. Note 6: Applies to pins SDA, SCL, PWM_STARTn, WD_START, FREQ_START, SPIN_START, ADDn, TACHn, PWMOUTn, FULL_SPEED. Note 7: fTOSC is used to measure fan speed by counting the number of 8192Hz (fTOSC/4) clock cycles that take place during a selectable number of tachometer periods. For internal oscillator only, typical frequency shift due to aging is within ±0.5%. Aging stressing includes level 1 moisture reflow preconditioning (24hr +125°C bake, 168hr +85°C/85%RH moisture soak, and three solder reflow passes +260°C +0°C/-5°C peak) followed by 192hr (max) VCC biased. Note 8: All timing specifications are guaranteed by design. Note 9: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s fall- ing edge. Note 10: CB—total capacitance of one bus line in pF. Note 11: Holding the SDA line low for a time greater than tTIMEOUT causes the device to reset SDA to the idle state of the serial bus communication (SDA set high). External Crystal Parameters (Note 3) www.maximintegrated.com Maxim Integrated │ 4 MAX31790 6-Channel PWM-Output Fan RPM Controller PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Maximum Receive SCL/SDA Fall Time tF (Note 10) 300 ns Minimum Receive SCL/SDA Fall Time tF (Note 10) 20 + 0.1 x CB ns Transmit SDA Fall Time tF 10pF P CB P 400pF (Note 10) 20 + 0.1 x CB 250 ns Pulse Width of Suppressed Spike tSP 35 ns SDA Time Low for Reset of Serial Interface tTIMEOUT (Note 11) 25 45 ms PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Crystal Oscillator Startup Time 1 s Nominal Frequency fO 32.768 kHz Series Resistance ESR 50 kI Load Capacitance CL 12 pF |
Similar Part No. - MAX31790_15 |
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Similar Description - MAX31790_15 |
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