DS1343_1112 Datasheet, PDF (4/20 Pages) Maxim Integrated Products – Low-Current SPI/3-Wire RTCs

Low-Current SPI/3-Wire RTCs
POWER-UP/DOWN CHARACTERISTICS
(TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
Recovery at Power-Up
VCC Fall Time (VPF to 0V)
VCC Rise Time (0V to VPF)
SYMBOL
tREC
tVCCF
tVCCR
CONDITIONS
MIN TYP MAX UNITS
20
40
ms
150
Fs
0
Fs
CAPACITANCE
(TA = +25°C, unless otherwise noted.)
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CI
CO
(Note 10)
(Note 10)
CONDITIONS
MIN TYP MAX UNITS
10
pF
15
pF
CRYSTAL PARAMETERS
PARAMETER
Nominal Frequency
Series Resistance
Load Capacitance
SYMBOL
fO
ESR
CL
DS1343
DS1344
CONDITIONS
MIN TYP
32.768
6
12.5
Note 2: Voltage referenced to ground.
Note 3: Limits at TA = -40°C are guaranteed by design and not production tested.
Note 4: CE = VCC, VSCLK = VCC to GND, IOUT = 0mA, trickle charger disabled.
Note 5: CE = GND, IOUT = 0mA, EOSC = EGFIL = DOSF = 0, trickle charger disabled.
Note 6: VCC = 0V, EGFIL = 0, DOSF = 1.
Note 7: VCC = 0V, EGFIL = 1, DOSF = 0.
Note 8: Applies to INT0 and INT1.
Note 9: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set.
Note 10: Guaranteed by design; not 100% production tested.
MAX
100
UNITS
kHz
kI
pF
4