Datasheet

(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
I
BACKUP
vs. V
BACKUP
, BBSQ1 = 1
DS1390 toc02
V
BACKUP
(V)
SUPPLY CURRENT (nA)
5.34.94.1 4.52.1 2.5 2.9 3.3 3.71.7
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
300
1.3
V
CC
= 0V
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
DS1390 toc04
SUPPLY (V)
FREQUENCY (Hz)
5.34.84.33.83.32.82.31.8
32767.85
32767.90
32767.95
32768.00
32767.80
1.3
I
BACKUP
vs. V
BACKUP
, BBSQ1 = 0
DS1390 TOC01
V
BACKUP
(V)
SUPPLY CURRENT (nA)
4.5 4.94.13.3 3.72.92.52.11.7
350
400
450
500
550
600
300
1.3 5.3
V
CC
= 0
I
BACKUP
vs. TEMPERATURE
V
BACKUP
= 3.0V
DS1390 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
806040200-20
300
400
350
450
500
550
600
250
-40
V
CC
= 0V
Maxim Integrated │ 10
www.maximintegrated.com
DS1390–DS1394 Low-Voltage SPI/3-Wire RTCs
with Trickle Charger
Typical Operating Characteristics