I2C RTC with Trickle Charger
Maxim Integrated
5
DS1340
OUTPUTS
VCC
VPF(MAX)
INPUTS
HIGH-Z
DON'T CARE
VALID
RECOGNIZED
VALID
VPF(MIN)
tREC
tR
tF
VPF
Figure 2. Power-Up/Power-Down Timing
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
ICCSA vs. VCC FT = 0
DS1340
toc01
VCC (V)
SUPPLY
CURRENT
(μ
A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
50
100
150
200
250
0
1.0
5.5
25
50
75
100
125
150
0
ICCS vs. VCC FT = 0
DS1340
toc02
VCC (V)
SUPPLY
CURRENT
(μ
A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
5.5
-1.8V
-3.0V
-3.3V
IBACKUP1 (FT = 0) vs. VBACKUP
DS1340
toc03
450
500
550
600
650
700
750
800
850
400
VBACKUP (V)
SUPPLY
CURRENT
(nA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
5.5
IBACKUP2 (FT = 1) vs. VBACKUP
DS1340
toc04
450
500
550
600
650
700
750
800
850
400
VBACKUP (V)
SUPPLY
CURRENT
(nA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
5.5
IBACKUP3 vs. TEMPERATURE
DS1340
toc05
TEMPERATURE (
°C)
SUPPLY
CURRENT
(nA)
60
40
-20
0
20
500
550
600
650
700
750
800
850
-40
80
VBACKUP = 3.0V
OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE
(FT x 64)
DS1340
toc06
VBACKUP (V)
FREQUENCY
(Hz)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
32768.1
32768.2
32768.3
32768.4
32768.5
32768.6
32768.0
1.0
5.5