RTCs with Constant-Voltage Trickle Charger
DS12R885/DS12CR887/DS12R887
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
I
BACKUP
vs. V
BACKUP
(DS12R885)
DS12R885 toc01
V
BACKUP
vs. V
CC
vs. I
BACKUP
(DS12R885)
V
CC
= 0V
3.0
DS12R885 toc02
625
0μA
-15μA
-30μA
-45μA
2.8
V
BACKUP
(V)
SUPPLY CURRENT (nA)
600
2.6
2.4
-60μA
2.2
575
550
2.0
2.3
2.5
V
BACKUP
(V)
2.8
3.0
2.0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
CC
(V)
I
BACKUP
vs. TEMPERATURE
(DS12R885)
625
SUPPLY CURRENT (nA)
600
575
550
525
500
475
450
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
V
CC
= 0V,
V
BACKUP
= 3.0V
DS12R885 toc03
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
32768.08
32768.06
FREQUENCY (Hz)
32768.04
32768.02
32768.00
32767.98
32767.96
32767.94
32767.92
32767.90
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY (V)
DS12R885 toc04
650
32768.10
8
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
