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DS1340C-33#

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
DS1340
I
2
C RTC with Trickle Charger
________________________________________________________________
Maxim Integrated Products
1
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.
General Description
The DS1340 is a real-time clock (RTC)/calendar that is
pin compatible and functionally equivalent to the ST
M41T00, including the software clock calibration. The
device additionally provides trickle-charge capability
on the V
BACKUP
pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional regis-
ters, which are accessed individually, are required for
the trickle charger and flag. The clock/calendar pro-
vides seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the back-
up supply. Reads and writes are inhibited while the
clock continues to run. The device is programmed seri-
ally through an I
2
C bidirectional bus.
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
Features
♦ Enhanced Second Source for the ST M41T00
♦ Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
♦ Fast (400kHz) I
2
C Interface
♦ Software Clock Calibration
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ Trickle-Charge Capability
♦ Low Timekeeping Voltage Down to 1.3V
♦ Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
♦ Oscillator Stop Flag
♦ Available in 8-Pin µSOP or SO Packages
♦ Underwriters Laboratories (UL) Recognized
Ordering Information
4
CPU
V
CC
V
CC
V
CC
5
6
8
12
SDA
SCL
GND
X2X1
V
CC
C1
R
PU
R
PU
CRYSTAL
FT/OUT
V
BACKUP
3
7
R
PU
= t
R
/ C
B
DS1340
Typical Operating Circuit
PART TEMP RANGE
PIN-
PACKAGE
TOP MARK
†
DS1340Z-18+ -40°C to +85°C
8 SO
(0.150in)
D1340-18
DS1340Z-3+ -40°C to +85°C
8 SO
(0.150in)
DS1340-3
DS1340Z-33+ -40°C to +85°C
8 SO
(0.150in)
D134033
DS1340U-18+ -40°C to +85°C 8 μSOP 1340 -18
DS1340U-3+ -40°C to +85°C 8 μSOP 1340 -3
DS1340U-33+ -40°C to +85°C 8 μSOP 1340 -33
DS1340C-18# -40°C to +85°C 16 SO DS1340C-18
DS1340C-3# -40°C to +85°C 16 SO DS1340C-3
DS1340C-33# -40°C to +85°C 16 SO DS1340C-33
Pin Configurations appear at end of data sheet.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
#
Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under RoHS requirements. The lead finish is
JESD97 category e3, and is compatible with both lead-based
and lead-free soldering processes.
†
A "+" anywhere on the top mark denotes a lead(Pb)-free device.
A "#" denotes a RoHS-compliant device.
19-5578; Rev 7; 8/11
DS1340
I
2
C RTC with Trickle Charger
2 _______________________________________________________________________________________
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
Pin 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
DS1340
I
2
C RTC with Trickle Charger
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
BACKUP1
OSC ON, FT = 0 (Note 9) 800 1150
I
BACKUP2
OSC ON, FT = 1 (Note 9) 850 1250
V
BACKUP
Current
I
BACKUP3
OSC ON, FT = 0, V
BACKUP
= 3.0V,
T
A
= +25°C (Notes 9, 10)
800 1000
nA
V
BACKUP
Data-Retention Current I
BACKUPDR
OSC OFF 25.0 100 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC MIN
to V
CC MAX
, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 1,14, Figure 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Standard mode 0 100
SCL Clock Frequency f
SCL
Fast mode 100 400
kHz
Standard mode 4.7
Bus Free Time Between STOP
and START Conditions
t
BUF
Fast mode 1.3
μs
Standard mode 4.0
Hold Time (Repeated) START
Condition (Note 11)
t
HD:STA
Fast mode 0.6
μs
Standard mode 4.7
Low Period of SCL Clock t
LOW
Fast mode 1.3
μs
Standard mode 4.0
High Period of SCL Clock t
HIGH
Fast mode 0.6
μs
Standard mode 0 0.9
Data Hold Time (Notes 12, 13) t
HD:DAT
Fast mode 0 0.9
μs
Standard mode 250
Data Setup Time (Note 14) t
SU:DAT
Fast mode 100
ns
Standard mode 4.7
START Setup Time t
SU:STA
Fast mode 0.6
μs
Standard mode 20 + 0.1C
B
1000
Rise Time of SDA and SCL
Signals (Note 15)
t
R
Fast mode 20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
300
Fall Time of SDA and SCL
Signals (Note 15)
t
F
Fast mode 20 + 0.1C
B
300
ns
Standard mode 4.7
Setup Time for STOP Condition t
SU:STO
Fast mode 0.6
μs
Capacitive Load for Each Bus
Line
C
B
(Note 15) 400 pF
I/O Capacitance (SCL, SDA) C
I/O
10 pF
Pulse Width of Spikes that Must
be Suppressed by the Input
Filter
t
SP
Fast mode 30 ns
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 16) 100 ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

DS1340C-33#

Mfr. #:
Buy DS1340C-33#
Manufacturer:
Maxim Integrated
Description:
Real Time Clock I2C RTC w/Trickle Charger
Lifecycle:
New from this manufacturer.
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