DS1390 Datasheet, PDF(8/24 Page) Maxim Integrated Products – Low-Voltage SPI/3-Wire RTCs with Trickle Charger

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DS1390 Datasheet, PDF (8/24 Pages) Maxim Integrated Products – Low-Voltage SPI/3-Wire RTCs with Trickle Charger

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Low-Voltage SPI/3-Wire RTCs with

Trickle Charger

CAPACITANCE

(TA = +25Â°C)

PARAMETER

Capacitance on All Input Pins

Capacitance on All Output Pins

(High Impedance)

SYMBOL

CIN

CIO

CONDITIONS

MIN TYP MAX UNITS

WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when the device

is in write protection.

Note 1: Limits at -40Â°C are guaranteed by design and not production tested.

Note 2: All voltages are referenced to ground.

Note 3: The use of the 250â¦ 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 50kâ¦ (typ) pullup resistor to VCC.

Note 10: ICCAâSCLK 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 +25Â°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 â¤ VCC â¤ VCC(MAX) and 1.3V â¤ VBAT â¤ 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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