Datasheet

2 Maxim Integrated
Low-Current SPI/3-Wire RTCs
DS1343/DS1344
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
BAT
Relative to Ground ............................................-0.3V to +6.0V
Voltage Range on Any Nonpower Pin
Relative to Ground ................................ -0.3V to (V
CC
+ 0.3V)
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature Maximum .....................................+150NC
Storage Temperature Range ............................ -55NC to +125NC
Lead Temperature (soldering, 10s) ................................+260NC
Soldering Temperature (reflow) ......................................+260NC
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to +5.5V, V
BAT
= +1.3V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (B
JA
) ..........91NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............20NC/W
TDFN
Junction-to-Ambient Thermal Resistance (B
JA
) ..........54NC/W
Junction-to-Case Thermal Resistance (B
JC
) .................8NC/W
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range V
CC
DS134_-18 1.71 1.8 5.5
VDS134_-3 2.7 3.0 5.5
DS134_-33 3.0 3.3 5.5
Minimum Timekeeping Voltage V
BAT
T
MIN
T
A
= +25NC
1.15 1.3 V
Backup Voltage V
BAT
1.3 5.5 V
Logic 1 Input V
IH
0.7 x
V
CC
V
CC
+
0.3
V
Logic 0 Input V
IL
-0.3
0.3 x
V
CC
V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Active Current I
CCA
-3 or -33: f
SCLK
= 4MHz (Note 4) 400
FA
Power-Supply Standby Current
(Note 5)
I
CCS
-33
V
CC
= 3.63V 120
FA
V
CC
= V
CC(MAX)
160
-3
V
CC
= 3.3V 130
V
CC
= V
CC(MAX)
175
-18
V
CC
= 1.89V 120
V
CC
= V
CC(MAX)
200
Backup Leakage Current I
BATLKG
V
CC
> V
PF
-100 +25 +100 nA
Backup Current (Oscillator Off) I
BAT
T
A
= +25NC, V
CC
= 0V, EOSC = 1
100 nA
Backup Current
(Note 6)
DS1343
I
BAT1
V
BAT
= 3V 250
nA
V
BAT
= V
BAT(MAX)
500
DS1344
V
BAT
= 3V 350
V
BAT
= V
BAT(MAX)
600