DS1390 Maxim, DS1390 Datasheet - Page 9

• Manufacturer Part Number: DS1390
• Description: The low-voltage serial-peripheral interface (SPI™) DS1390/DS1391/DS1394 and the low-voltage 3-wire DS1392/DS1393 real-time clocks (RTCs) are clocks/calendars that provide hundredths of a second, seconds, minutes, hours, day, date, month, and ye
• Manufacturer: Maxim

CAPACITANCE
(T
WARNING:
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: I
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
Note 13: With 50pF load.
Note 14: Measured at V
Note 15: Measured at V
Note 16: The parameter t
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
Capacitance on All Input Pins
Capacitance on All Output Pins
(High Impedance)
A
= +25°C)
Limits at -40°C are guaranteed by design and not production tested.
All voltages are referenced to ground.
The use of the 250Ω trickle-charge resistor is not allowed at V
not recommended for V
Measured at V
Measured at V
Measured at V
SCLK, DIN, CS on DS1390/DS1391/DS1394; SCLK, and CE on DS1392/DS1393.
DOUT, SQW/INT (DS1390/DS1393/DS1394), SQW, and INT (DS1392).
The RST pin has an internal 50kΩ (typ) pullup resistor to V
inactive. Outputs are open.
0 ≤ V
added to this delay.
PARAMETER
CCA
—SCLK clocking at max frequency = 4MHz for 3V and 3.3V versions; 1MHz for 1.8V version; RST (DS1391/DS1393)
CC
Negative undershoots below -0.3V while the part is in battery-backed mode can cause loss of data.
≤ V
CC(MAX)
CC
CC
CC
IH
OH
OSF
= 0.7 x V
= typ, V
= typ, V
= typ, V
= 0.7 x V
and 1.3V ≤ V
is the time that the oscillator must be stopped for the OSF flag to be set over the voltage range of
CC
BACKUP
BACKUP
BACKUP
DD
< 3.0V.
DD
SYMBOL
Low-Voltage SPI/3-Wire RTCs with
or V
C
C
or V
IN
IO
_____________________________________________________________________
BACKUP
IL
= 0V, register 0Fh = A5h.
= 0V, register 0Fh = A6h.
= 0V, register 0Fh = A7h.
OL
= 0.2 x V
= 0.2 x V
≤ 5.5V.
DD
DD
, 10ns rise/fall times.
. Measured from the 50% point of SCLK to the V
CONDITIONS
CC
.
CC
> 3.63V and should not be enabled. Use of the diode is
Trickle Charger
MIN
TYP
OH
minimum of SDO.
BACKUP
MAX
10
10
.
UNITS
pF
pF
9