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DS1390 Datasheet

  • DS1390

  • Low-Voltage SPI/3-Wire RTCs with Trickle Charger

  • MAXIM   MAXIM

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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
DS1390/DS1391/DS1392/DS1393
CAPACITANCE
(T
A
= +25擄C)
PARAMETER
Capacitance on All Input Pins
Capacitance on All Output Pins
(High Impedance)
SYMBOL
C
IN
C
IO
CONDITIONS
MIN
TYP
MAX
10
10
UNITS
pF
pF
WARNING:
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
Note 16:
Note 17:
Under no circumstances are negative undershoots, of any amplitude, allowed when the device
is in write protection.
Limits at -40擄C are guaranteed by design and not production tested.
All voltages are referenced to ground.
The use of the 250鈩?trickle-charge resistor is not allowed at V
CC
> 3.63V and should not be enabled. Use of the diode is
not recommended for V
CC
< 3.0V.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 0Fh = A5h.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 0Fh = A6h.
Measured at V
CC
= typ, V
BACKUP
= 0V, register 0Fh = A7h.
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鈩?(typ) pullup resistor to V
CC
.
I
CCA
鈥擲CLK clocking at max frequency = 4MHz for 3V and 3.3V versions; 1MHz for 1.8V version; RST (DS1391/DS1393)
inactive. Outputs are open.
Specified with bus inactive.
Measured with a 32.768kHz crystal attached to X1 and X2. Typical values measured at +25擄C and 3.0V
BACKUP
.
With 50pF load.
Measured at V
IH
= 0.7 x V
DD
or V
IL
= 0.2 x V
DD
, 10ns rise/fall times.
Measured at V
OH
= 0.7 x V
DD
or V
OL
= 0.2 x V
DD
. Measured from the 50% point of SCLK to the V
OH
minimum of SDO.
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
鈮?/div>
V
CC
鈮?/div>
V
CC(MAX)
and 1.3V
鈮?/div>
V
BAT
鈮?/div>
5.5V.
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.
8
_____________________________________________________________________

DS1390 PDF文件相關(guān)型號(hào)

DS1390-DS1393,DS1390U-18,DS1390U-3,DS1391U-18,DS1391U-3,DS1392U-18,DS1392U-3,DS1393U-18,DS1393U-3

DS1390相關(guān)型號(hào)PDF文件下載

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