Datasheet

I
2
C RTC with Trickle Charger
Maxim Integrated 5
DS1340
OUTPUTS
V
CC
V
PF(MAX)
INPUTS
HIGH-Z
DON'T CARE
VALID
RECOGNIZED RECOGNIZED
VALID
V
PF(MIN)
t
REC
t
R
t
F
V
PF
V
PF
Figure 2. Power-Up/Power-Down Timing
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
I
CCSA
vs. V
CC
FT = 0
DS1340 toc01
V
CC
(V)
SUPPLY CURRENT (μA)
5.04.54.03.53.02.52.01.5
50
100
150
200
250
0
1.0 5.5
25
50
75
100
125
150
0
I
CCS
vs. V
CC
FT = 0
DS1340 toc02
V
CC
(V)
SUPPLY CURRENT (μA)
5.04.54.03.53.02.52.01.51.0 5.5
-1.8V
-3.0V
-3.3V
I
BACKUP1
(FT = 0) vs. V
BACKUP
DS1340 toc03
450
500
550
600
650
700
750
800
850
400
V
BACKUP
(V)
SUPPLY CURRENT (nA)
5.04.54.03.53.02.52.01.51.0 5.5
I
BACKUP2
(FT = 1) vs. V
BACKUP
DS1340 toc04
450
500
550
600
650
700
750
800
850
400
V
BACKUP
(V)
SUPPLY CURRENT (nA)
5.04.54.03.53.02.52.01.51.0 5.5
I
BACKUP3
vs. TEMPERATURE
DS1340 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
6040-20 0 20
500
550
600
650
700
750
800
850
-40 80
V
BACKUP
= 3.0V
OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE
(FT x 64)
DS1340 toc06
V
BACKUP
(V)
FREQUENCY (Hz)
5.04.54.03.53.02.52.01.5
32768.1
32768.2
32768.3
32768.4
32768.5
32768.6
32768.0
1.0 5.5