Datasheet

DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
2
Maxim Integrated
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 nominal supply voltage and 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
Pin Relative to Ground .....-0.3V to +6.0V
Voltage Range on Inputs 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
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DS139x-33 2.97 3.3 5.50
DS139x-3 2.7 3.0 3.3
Supply Voltage (Note 2) V
CC
DS139x-18 1.71 1.8 1.89
V
Logic 1 V
IH
(Note 2)
0.7 x
V
CC
V
CC
+
0.5
V
Logic 0 V
IL
(Note 2) -0.3
+0.3 x
V
CC
V
Supply Voltage, Pullup
SQW/INT, SQW, INT, V
CC
= 0V
V
PU
(Note 2) 5.5 V
-33 1.3 3.0 V
CC(MAX)
-3 1.3 3.0 3.7
V
BACKUP
Voltage (Note 2) V
BACKUP
-18 1.3 3.0 3.7
V
-33 2.70 2.88 2.97
-3 2.45 2.6 2.70
Power-Fail Voltage (Note 2) V
PF
-18 1.51 1.6 1.71
V
R1 (Notes 3, 4) 250
R2 (Notes 3, 5) 2000
Trickle-Charge Current-Limiting
Resistors
R3 (Notes 3, 6) 4000

Input Leakage I
LI
(Note 7) -1 +1 µA
I/O Leakage I
LO
(Note 8) -1 +1 µA
RST Pin I/O Leakage I
LORST
(Note 9) -200 +10 µA
-33, -3 (V
OH
= 0.85 x V
CC
) -1
DOUT Logic 1 Output I
OHDOUT
-18 (V
OH
= 0.80 x V
CC
) 0.750
mA
-33, -3 (V
OL
= 0.15 x V
CC
) 3
DOUT Logic 0 Output I
OHDOUT
-18 (V
OL
= 0.20 x V
CC
) 2
mA
V
CC
> 1.71V; V
OL
= 0.4V 3.0 mA
Logic 0 Output
(DS1390/DS1393/DS1394
SQW/INT; DS1392 SQW, INT;
DS1391/DS1393 RST)
I
OLSIR
1.3V < V
CC
< 1.71V; V
OL
= 0.4V 250 µA
-33 2
-3 2
mA
V
CC
Active Supply Current
(Note 10)
I
CCA
-18 500 µA