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DS1392 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1392 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 25 page Low-Voltage SPI/3-Wire RTCs with Trickle Charger 8 _____________________________________________________________________ CAPACITANCE (TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Capacitance on All Input Pins CIN 10 pF Capacitance on All Output Pins (High Impedance) CIO 10 pF WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when the device is in write protection. Note 1: Limits at -40°C are guaranteed by design and not production tested. Note 2: All voltages are referenced to ground. Note 3: The use of the 250 Ω trickle-charge resistor is not allowed at VCC > 3.63V and should not be enabled. Use of the diode is not recommended for VCC < 3.0V. Note 4: Measured at VCC = typ, VBACKUP = 0V, register 0Fh = A5h. Note 5: Measured at VCC = typ, VBACKUP = 0V, register 0Fh = A6h. Note 6: Measured at VCC = typ, VBACKUP = 0V, register 0Fh = A7h. Note 7: SCLK, DIN, CS on DS1390/DS1391; SCLK, and CE on DS1392/DS1393. Note 8: DOUT, SQW/INT (DS1390/DS1393), SQW, and INT (DS1392). Note 9: The RST pin has an internal 50k Ω (typ) pullup resistor to VCC. Note 10: ICCA—SCLK clocking at max frequency = 4MHz for 3V and 3.3V versions; 1MHz for 1.8V version; RST (DS1391/DS1393) inactive. Outputs are open. Note 11: Specified with bus inactive. Note 12: Measured with a 32.768kHz crystal attached to X1 and X2. Typical values measured at +25°C and 3.0VBACKUP. Note 13: With 50pF load. Note 14: Measured at VIH = 0.7 x VDD or VIL = 0.2 x VDD, 10ns rise/fall times. Note 15: Measured at VOH = 0.7 x VDD or VOL = 0.2 x VDD. Measured from the 50% point of SCLK to the VOH minimum of SDO. Note 16: The parameter tOSF is the time that the oscillator must be stopped for the OSF flag to be set over the voltage range of 0 ≥ VCC ≥ VCC(MAX) and 1.3V ≤ VBACKUP ≤ 5.5V. Note 17: This delay applies only if the oscillator is enabled and running. If the EOSC bit is 1, the startup time of the oscillator is added to this delay. ≥ ≥ ≥ ≥ |
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