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DS3234SN Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS3234SN Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 21 page Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM _____________________________________________________________________ 5 Pushbutton Reset Timing tRST PBDB RST Power-Switch Timing VCC VPF(MAX) RST VPF(MIN) tVCCF tVCCR tREC VPF VPF Note 2: Limits at -40°C are guaranteed by design and not production tested. Note 3: All voltages are referenced to ground. Note 4: Measured at VIH = 0.8 x VCC or VIL = 0.2 x VCC, 10ns rise/fall time, DOUT = no load. Note 5: Current is the averaged input current, which includes the temperature conversion current. CRATE1 = CRATE0 = 0. Note 6: The RST pin has an internal 50k Ω (nominal) pullup resistor to VCC. Note 7: Measured at VOH = 0.8 x VCC or VOL = 0.2 x VCC. Measured from the 50% point of SCLK to the VOH minimum of DOUT. Note 8: With 50pF load. Note 9: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage range of 0V ≤ VCC ≤ VCC(MAX) and 2.3V ≤ VBAT ≤ VBAT(MAX). Note 10: This delay only applies if the oscillator is enabled and running. If the EOSC bit is 1, tREC is bypassed and RST immediately goes high. Note 11: Guaranteed by design and not production tested. WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data. |
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