Rainbow Electronics DS1393 - Manual (Page 9)

DS1390/DS1391/DS1392/DS1393
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
_____________________________________________________________________ 9
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
I BACKUP vs. V BACKUP , BBSQ1 = 0
DS1390 TOC01
V
BACKUP
(V)
SUPPLY CURRENT (nA)
4.5 4.9 4.1 3.3 3.7 2.9 2.5 2.1 1.7
350
400
450
500
550
600
300
1.3 5.3
V CC = 0
I BACKUP vs. V BACKUP , BBSQ1 = 1
DS1390 toc02
V
BACKUP
(V)
SUPPLY CURRENT (nA)
5.3 4.9 4.1 4.5 2.1 2.5 2.9 3.3 3.7 1.7
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
300
1.3
V CC = 0V
I BACKUP vs. TEMPERATURE
V BACKUP = 3.0V
DS1390 toc03
TEMPERATURE ( °C)
SUPPLY CURRENT (nA)
80 60 40 20 0 -20
300
400
350
450
500
550
600
250
-40
V CC = 0V
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
DS1390 toc04
SUPPLY (V)
FREQUENCY (Hz)
5.3 4.8 4.3 3.8 3.3 2.8 2.3 1.8
32767.85
32767.90
32767.95
32768.00
32767.80
1.3