DS1344 Maxim, DS1344 Datasheet - Page 7

• Manufacturer Part Number: DS1344
• Description: The DS1343/DS1344 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, permitting longer life from a backup supply source
• Manufacturer: Maxim

(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
600
500
400
300
200
100
280
260
240
220
200
180
160
140
380
360
340
320
300
280
260
240
220
200
0
3.0
1.0
1.0
EGFIL = 0, DOSF = 1, I
T
CE = V
I
EGFIL = 0
DOSF = 1
I
OUT
OUT
A
1.5
1.5
= +25°C
vs. POWER-SUPPLY VOLTAGE
DS1343 BATTERY CURRENT1
DS1344 BATTERY CURRENT1
= 0mA
f
= 0mA
SCLK
POWER-SUPPLY CURRENT
T
IH
3.5
A
2.0
2.0 2.5 3.0
vs. BATTERY VOLTAGE
vs. BATTERY VOLTAGE
= +25°C
= 4MHz
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
SUPPLY VOLTAGE (V)
2.5
T
A
4.0
T
= -40°C
T
A
T
3.0
A
A
= -40°C
= +25°C
= +85°C
OUT
3.5
3.5 4.0
= 0mA
4.5
T
4.0
f
SCLK
A
= +85°C
4.5 5.0
4.5
= 1MHz
5.0
Low-Current SPI/3-Wire RTCs
5.0
5.5
5.5
5.5
Typical Operating Characteristics
140
130
120
110
100
340
320
300
280
260
240
220
200
180
440
390
340
290
240
90
80
70
60
3.0
1.0
1.0
CE = V
I
EGFIL = 1
DOSF = 0
I
EGFIL = 1, DOSF = 0, I
OUT
OUT
1.5 2.0 2.5
1.5
vs. POWER-SUPPLY VOLTAGE
DS1343 BATTERY CURRENT2
DS1344 BATTERY CURRENT2
= 0mA
= 0mA
POWER-SUPPLY CURRENT
IL
3.5
T
2.0
vs. BATTERY VOLTAGE
vs. BATTERY VOLTAGE
A
= +85°C
T
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
SUPPLY VOLTAGE (V)
A
T
2.5
A
= +25°C
= +85°C
4.0
T
3.0
3.0
A
= -40°C
T
T
OUT
A
A
3.5
3.5
= -40°C
= -40°C
= 0mA
4.5
T
4.0
4.0
A
T
= +85°C
A
T
A
= +25°C
4.5
4.5
= +25°C
5.0
5.0
5.0
5.5
5.5
5.5
7