For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Current SPI/3-Wire RTCs
DS1343/DS1344
ABSOLUTE MAXIMUM RATINGS
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
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.
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
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.maxim-ic.com/thermal-tutorial.
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Operating Voltage Range
Minimum Timekeeping Voltage
Backup Voltage
Logic 1 Input
Logic 0 Input
SYMBOL
DS134_-18
V
CC
V
BAT
T
MIN
V
BAT
V
IH
V
IL
DS134_-3
DS134_-33
T
A
= +25NC
1.3
0.7 x
V
CC
-0.3
CONDITIONS
MIN
1.71
2.7
3.0
TYP
1.8
3.0
3.3
1.15
MAX
5.5
5.5
5.5
1.3
5.5
V
CC
+
0.3
0.3 x
V
CC
V
V
V
V
V
UNITS
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)
PARAMETER
Power-Supply Active Current
Power-Supply Standby Current
(Note 5)
Backup Current
(Oscillator Off)
Backup Current
DS1343 (Note 6)
Backup Current
DS1343 (Note 7)
SYMBOL
I
CCA
I
CCS
I
BAT
I
BAT1
I
BAT2
CONDITIONS
-3 or -33: f
SCLK
= 4MHz (Note 4)
-33: V
CC
= 3.63V
V
CC
= V
CC(MAX)
T
A
= +25NC, V
CC
= 0V,
EOSC
= 1
V
BAT
= 3V
V
BAT
= V
BAT(MAX)
V
BAT
= 3V
V
BAT
= V
BAT(MAX)
300
600
250
500
MIN
TYP
MAX
600
120
160
100
UNITS
FA
FA
nA
nA
nA
2
Low-Current SPI/3-Wire RTCs
DC ELECTRICAL CHARACTERISTICS (continued)
(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)
PARAMETER
Input Leakage (CE, SERMODE,
SCLK, SDI)
Output Leakage
(INT0,
INT1, PF,
SDO)
Output Logic 1
(PF, SDO)
Output Logic 0
V
OL
= 0.4V
(INT0,
INT1, PF,
SDO)
Power-Fail Trip Point
SYMBOL
I
I
I
O
I
OH
I
OL
CONDITIONS
V
IN
= 0V to V
CC
CE = V
IL
, no alarms
-3 or -33: V
OH
= 2.4V
V
CC
R
V
CC(MIN)
V
BAT
R
1.3V
R
V
CC
+ 0.2V (Note 8)
-18
V
PF
-3
-33
Switchover Voltage
V
SW
R1
Trickle-Charger Resistors
R2
R3
V
BAT
> V
PF
V
BAT
< V
PF
MIN
-0.1
-0.1
-1
3.0
250
1.51
2.45
2.70
1.6
2.6
2.88
V
PF
V
BAT
> V
CC
1
2
4
kI
1.71
2.70
3.0
V
V
TYP
MAX
+0.1
+0.1
UNITS
FA
FA
mA
mA
FA
DS1343/DS1344
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
SCLK Frequency
Data to SCLK Setup
SCLK to Data Hold
SCLK to Data Delay
SCLK Low Time
SCLK High Time
SCLK Rise and Fall
CE to SCLK Setup
SCLK to CE Hold
CE Inactive Time
CE to Output High-Z
Oscillator Stop Flag (OSF) Delay
SYMBOL
f
SCLK
t
DC
t
CDH
t
CDD
t
CL
t
CH
t
R,
t
F
t
CC
t
CCH
t
CWH
t
CDZ
t
OSF
(Note 9)
25
-18
-3 or -33
400
100
500
400
40
100
-18
-3 or -33
-18
-3 or -33
-18
-3 or -33
400
110
400
110
200
-18
-3 or -33
CONDITIONS
MIN
DC
DC
30
30
160
80
TYP
MAX
1
4
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
3
Low-Current SPI/3-Wire RTCs
DS1343/DS1344
POWER-UP/DOWN CHARACTERISTICS
(T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
Recovery at Power-Up
V
CC
Fall Time (V
PF
to 0V)
V
CC
Rise Time (0V to V
PF
)
SYMBOL
t
REC
t
VCCF
t
VCCR
150
0
CONDITIONS
MIN
TYP
20
MAX
40
UNITS
ms
Fs
Fs
CAPACITANCE
(T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
C
I
C
O
(Note 10)
(Note 10)
CONDITIONS
MIN
TYP
10
15
MAX
UNITS
pF
pF
CRYSTAL PARAMETERS
PARAMETER
Nominal Frequency
Series Resistance
Load Capacitance
Note
Note
Note
Note
Note
Note
Note
Note
Note
SYMBOL
f
O
ESR
C
L
DS1343
DS1344
6
12.5
CONDITIONS
MIN
TYP
32.768
100
MAX
UNITS
kHz
kI
pF
2:
Voltage referenced to ground.
3:
Limits at T
A
= -40°C are guaranteed by design and not production tested.
4:
CE = V
CC
, V
SCLK
= V
CC
to GND, I
OUT
= 0mA, trickle charger disabled.
5:
CE = GND, I
OUT
= 0mA,
EOSC
= EGFIL = DOSF = 0, trickle charger disabled.
6:
V
CC
= 0V, EGFIL = 0, DOSF = 1.
7:
V
CC
= 0V, EGFIL = 1, DOSF = 0.
8:
Applies to
INT0
and
INT1.
9:
The parameter t
OSF
is the period of time the oscillator must be stopped for the OSF flag to be set.
10:
Guaranteed by design; not 100% production tested.
4
Low-Current SPI/3-Wire RTCs
SPI Write Timing
t
CWH
DS1343/DS1344
CE
t
CC
t
CL
SCLK*
t
CDH
t
CH
t
F
t
R
t
CCH
t
DC
t
CDH
SDI
R/W = 1
A6
A0
D7
D0
WRITE ADDRESS BYTE
*SCLK CAN BE EITHER POLARITY. TIMING SHOWN FOR CPOL = 1.
SERMODE = V
CC
.
WRITE DATA BYTE
SPI Read Timing
t
CWH
CE
t
CC
t
CL
SCLK*
t
CDH
t
DC
SDI
t
CH
t
CDD
t
CDZ
R/W = 0
A6
A0
SDO
D7
D0
WRITE ADDRESS BYTE
*SCLK CAN BE EITHER POLARITY. TIMING SHOWN FOR CPOL = 1.
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