
DS1308
Low-Current I2C RTC with 56-Byte NV RAM
6
Maxim Integrated
Typical Operating Characteristics
(VCC = +3.3V, TA = +25NC, unless otherwise specified.)
POWER-SUPPLY CURRENT
vs. SCL FREQUENCY
DS1308
toc05
SCL FREQUENCY (kHz)
POWER-SUPPLY
CURRENT
(A)
300
200
100
150
200
50
0
400
TA = +25°C,
IOUT = 0mA
5.0V
3.0V
SQW/CLKIN OUTPUT-VOLTAGE LOW
vs. OUTPUT CURRENT
DS1308
toc04
OUTPUT CURRENT (mA)
OUTPUT
VOLTAGE
(V)
3
2
1
0.1
0.2
0.3
0.4
0
04
TA = +25°C,
OUT = ECLK = SQWE = 0
VCC = 3.0V
VCC = 5.0V
VCC = 1.3V
BATTERY CURRENT (SQW ON)
vs. BATTERY VOLTAGE
DS1308
toc03
BATTERY VOLTAGE (V)
BATTERY
CURRENT
(nA)
4.5
3.5
2.5
300
400
500
600
700
800
200
1.5
5.5
RS1 = RS0 = SQWE = 1,
IOUT = 0mA
+85°C
+25°C
-40°C
BATTERY CURRENT (SQW OFF)
vs. BATTERY VOLTAGE
DS1308
toc02
BATTERY VOLTAGE (V)
BATTERY
CURRENT
(nA)
4.5
3.5
2.5
150
200
250
300
350
400
100
1.5
5.5
SQWE = 0, IOUT = 0mA
+85°C
+25°C
-40°C
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS1308
toc01
SUPPLY VOLTAGE (V)
SUPPLY
CURRENT
(A)
5.0
4.5
3.5
4.0
80
90
100
110
130
120
140
150
70
3.0
5.5
SQWE = 1, IOUT = 0mA
+85°C
+25°C
-40°C