DS1390-DS1393 MAXIM [Maxim Integrated Products], DS1390-DS1393 Datasheet - Page 8

• Manufacturer Part Number: DS1390-DS1393
• Description: Low-Voltage SPI/3-Wire RTCs with Trickle Charger
• Manufacturer: MAXIM [Maxim Integrated Products]

Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
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
8
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 250
not recommended for V
Measured at V
Measured at V
Measured at V
SCLK, DIN, CS on DS1390/DS1391; SCLK, and CE on DS1392/DS1393.
DOUT, SQW/INT (DS1390/DS1393), SQW, and INT (DS1392).
The RST pin has an internal 50k (typ) pullup resistor to V
inactive. Outputs are open.
0
added to this delay.
PARAMETER
CCA
V
—SCLK clocking at max frequency = 4MHz for 3V and 3.3V versions; 1MHz for 1.8V version; RST (DS1391/DS1393)
CC
Under no circumstances are negative undershoots, of any amplitude, allowed when the device
is in write protection.
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
is the time that the oscillator must be stopped for the OSF flag to be set over the voltage range of
trickle-charge resistor is not allowed at V
CC
BACKUP
BACKUP
BACKUP
DD
< 3.0V.
DD
SYMBOL
or V
C
C
or V
IN
IO
V
BAT
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
MIN
TYP
OH
minimum of SDO.
BACKUP
MAX
10
10
.
UNITS
pF
pF