Rainbow-electronics DS1393 Manuel d'utilisateur télécharger pdf (Page 8)

DS1390/DS1391/DS1392/DS1393

Low-Voltage SPI/3-Wire RTCs with

Trickle Charger

8 _____________________________________________________________________

CAPACITANCE

= +25°C)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

Capacitance on All Input Pins C

10 pF

Capacitance on All Output Pins

(High Impedance)

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 250Ω trickle-charge resistor is not allowed at V

> 3.63V and should not be enabled. Use of the diode is

not recommended for V

< 3.0V.

Note 4: Measured at V

= typ, V

BACKUP

= 0V, register 0Fh = A5h.

Note 5: Measured at V

= typ, V

BACKUP

= 0V, register 0Fh = A6h.

Note 6: Measured at V

= typ, V

BACKUP

= 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 50kΩ (typ) pullup resistor to V

Note 10: I

CCA

—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 3.0V

BACKUP

Note 13: With 50pF load.

Note 14: Measured at V

= 0.7 x V

or V

= 0.2 x V

, 10ns rise/fall times.

Note 15: Measured at V

= 0.7 x V

or V

= 0.2 x V

. Measured from the 50% point of SCLK to the V

minimum of SDO.

Note 16: The parameter t

OSF

is the time that the oscillator must be stopped for the OSF flag to be set over the voltage range of

0 ≤ V

≤ V

CC(MAX)

and 1.3V ≤ V

BAT

≤ 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.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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Rainbow-electronics DS1393 Manuel d'utilisateur Page 8

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