Datasheet

4 Maxim Integrated
Low-Current SPI/3-Wire RTCs
DS1343/DS1344
POWER-UP/DOWN CHARACTERISTICS
(T
A
= -40°C to +85°C, unless otherwise noted.)
CAPACITANCE
(T
A
= +25°C, unless otherwise noted.)
CRYSTAL PARAMETERS
Note 2: Voltage referenced to ground.
Note 3: Limits at T
A
= -40°C are guaranteed by design and not production tested.
Note 4: CE = V
CC
, V
SCLK
= V
CC
to GND, I
OUT
= 0mA, trickle charger disabled.
Note 5: CE = GND, I
OUT
= 0mA, EOSC = EGFIL = DOSF = 0, trickle charger disabled.
Note 6: V
CC
= 0V, EGFIL = 0, DOSF = 1.
Note 7: V
CC
= 0V, EGFIL = 1, DOSF = 0.
Note 8: Applies to INT0 and INT1.
Note 9: The parameter t
OSF
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.
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Recovery at Power-Up t
REC
20 40 ms
V
CC
Fall Time (V
PF
to 0V) t
VCCF
150
Fs
V
CC
Rise Time (0V to V
PF
) t
VCCR
0
Fs
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Capacitance C
I
(Note 10) 10 pF
Output Capacitance C
O
(Note 10) 15 pF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Nominal Frequency f
O
32.768 kHz
Series Resistance ESR 100
kI
Load Capacitance C
L
DS1343 6
pF
DS1344 12.5
SCLK Rise and Fall t
R,
t
F
200 ns
CE to SCLK Setup t
CC
400 ns
SCLK to CE Hold t
CCH
100 ns
CE Inactive Time t
CWH
-18 500
ns
-3 or -33 400
CE to Output High-Z t
CDZ
80 ns
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 9) 25 100 ms