Datasheet

(V
CC
=3.3V,T
A
=+25°C,unlessotherwisenoted.)
POWER SUPPLY CURRENT
vs. POWER SUPPLY VOLTAGE
DS1339B toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
4.73.72.7
60
80
100
120
140
160
180
40
1.7 5.7
V
CC
= SCL = SDA,
V
BACKUP
= 3V
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
POWER SUPPLY CURRENT
vs. SCL FREQUENCY
DS1339B toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
4.73.72.7
100
150
200
250
300
350
400
450
50
1.7 5.7
V
CC
= SDA,
V
BACKUP
= 3V
f
SCL
= 400kHz
f
SCL
= 100kHz
f
SCL
= 1kHz
BACKUP SUPPLY CURRENT
vs. BACKUP VOLTAGE
DS1339B toc03
BACKUP VOLTAGE (V)
BACKUP CURRENT (nA)
3.32.3
150
200
250
300
350
400
450
500
100
1.3 4.3
V
CC
= 0V,
SQW OFF
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
BACKUP SUPPLY CURRENT
vs. BACKUP VOLTAGE
DS1339B toc04
BACKUP VOLTAGE (V)
BACKUP CURRENT (nA)
3.32.3
300
350
400
450
500
550
600
650
250
1.3 4.3
V
CC
= 0V,
SQW ON,
I
OUT
= 0mA
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
INT/SQW OUTPUT CURRENT
vs. OUTPUT VOLTAGE
DS1339B toc05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
862 4
0.1
0.2
0.3
0.4
0.6
0.5
0.7
0.8
0
0 10
V
CC
= 1.71V,
T
A
= +25°C
INT/SQW OUTPUT CURRENT
vs. OUTPUT VOLTAGE
DS1339B toc06
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
1.51.00.5
0.1
0.2
0.3
0.4
0
0 2.0
V
BACKUP
= 1.3V,
V
CC
= 0V,
T
A
= +25°C
TRICKLE CHARGER RESISTORS
vs. POWER SUPPLY VOLTAGE
DS1339B toc07
POWER SUPPLY VOLTAGE (V)
RESISTANCE (Ω)
4.73.72.7
500
1000
1500
2000
2500
3000
3500
4000
0
1.7 5.7
T
A
= +25°C
4kΩ SELECTED
2kΩ SELECTED
200Ω SELECTED
DS1339B Low-Current, I
2
C, Serial Real-Time Clock
For High-ESR Crystals
MaximIntegrated │ 6
www.maximintegrated.com
Typical Operating Characteristics