Datasheet

I
2
C RTC with Trickle Charger
2 Maxim Integrated
DS1340
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on V
CC
or V
BACKUP
Pins
Relative to Ground.............................................-0.3V to +6.0V
Voltage Range on SDA, SCL, and FT/OUT
Relative to Ground..................................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DS1340-18 1.71 1.8 5.5
DS1340-3 2.7 3.0 5.5
Supply Voltage (Note 2) V
CC
DS1340-33 2.97 3.3 5.5
V
Input Logic 1 (SDA, SCL) V
IH
(Note 2) 0.7 x V
CC
V
CC
+ 0.3 V
Input Logic 0 (SDA, SCL) V
IL
(Note 2) -0.3 +0.3 x V
CC
V
Supply Voltage, Pullup
(FT/OUT, SDA, SCL), V
CC
= 0V
V
PU
(Note 2) 5.5 V
DS1340-18 1.3 3.7
DS1340-3 1.3 3.7
Backup Supply Voltage (Note 2) V
BACKUP
DS1340-33 1.3 5.5
V
R1 (Notes 3, 4) 250
R2 (Note 5) 2000
Trickle-Charge Current-Limiting
Resistors
R3 (Note 6) 4000

DS1340-18 1.51 1.6 1.71
DS1340-3 2.45 2.6 2.7
Power-Fail Voltage (Note 2) V
PF
DS1340-33 2.70 2.88 2.97
V
Input Leakage (SCL, CLK) I
LI
-1 +1 μA
I/O Leakage (SDA, FT/OUT) I
LO
-1 +1 μA
V
CC
> 2V; V
OL
= 0.4V 3.0
SDA Logic 0 Output I
OLSDA
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
3.0
mA
V
CC
> 2V; V
OL
= 0.4V 3.0
1.7V < V
CC
< 2V; V
OL
= 0.2 x V
CC
3.0
mA
FT/OUT Logic 0 Output I
OLSQW
1.3V < V
CC
< 1.7V; V
OL
= 0.2x V
CC
250 μA
DS1340-18; V
CC
= 1.89V 72 150
DS1340-3; V
CC
= 3.3V 108 200
Active Supply Current (Note 7) I
CCA
DS1340-33; V
CC
= 5.5V 192 300
μA
DS1340-18; V
CC
= 1.89V 60 100
DS1340-3; V
CC
= 3.3V 81 125
Standby Current (Note 8) I
CCS
DS1340-33; V
CC
= 5.5V 100 150
μA
V
BACKUP
Leakage Current I
BACKUPLKG
V
BACKUP
= 3.7V 100 nA