DS1343E-18+ Maxim Integrated Products, DS1343E-18+ Datasheet
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DS1343E-18+
Manufacturer Part Number
DS1343E-18+
Description
Real Time Clock SPI RTC 20P TSSOP 1.8V 6PF ALRM
Manufacturer
Maxim Integrated Products
19-5801; Rev 0; 3/11
The DS1343/DS1344 low-current real-time clocks (RTCs)
are timekeeping devices that provide an extremely low
standby current, permitting longer life from a backup
supply source. The devices also support high-ESR
crystals, broadening the pool of usable crystals for the
devices. The clock/calendar provides seconds, minutes,
hours, day, date, month, and year information. The date
at the end of the month is automatically adjusted for
months with fewer than 31 days, including corrections
for leap year. The clock operates in either 24-hour or
12-hour format with an AM/PM indicator.
Address and data are transferred serially through an
SPI™ or 3-wire interface. Two programmable time-of-day
alarms are provided. Each alarm can generate an inter-
rupt on a combination of seconds, minutes, hours, and
day. Don’t-care states can be inserted into one or more
fields if it is desired for them to be ignored for the alarm
condition. The time-of-day alarms can be programmed
to assert two different interrupt outputs, or they can be
combined to assert one common interrupt output. Both
interrupt outputs operate when the device is powered by
either V
The devices are available in a lead-free/RoHS-compliant,
20-pin TSSOP or 14-pin TDFN package, and support a
-40°C to +85°C extended industrial temperature range.
Ordering Information
SPI is a trademark of Motorola, Inc.
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.
Medical
Handheld Devices
Telematics
Embedded Timestamping
CC
or V
BAT
_______________________________________________________________ Maxim Integrated Products 1
.
appears at end of data sheet.
General Description
Applications
Low-Current SPI/3-Wire RTCs
S Low Timekeeping Current of 250nA (typ)
S Compatible with Crystal ESR Up to 100kI
S Versions Available to Support Either 6pF or
S RTC Counts Seconds, Minutes, Hours, Day, Date,
S Power-Fail and Switch Circuitry
S Three Operating Voltages
S Trickle-Charge Capability
S Maintain Time Down to 1.15V (typ)
S Support Motorola SPI Modes 1 and 3, or Standard
S Burst Mode for Reading/Writing Successive
S 96-Byte Battery-Backed NV RAM for Data Storage
S Two Time-of-Day Alarms with Two Interrupt
S Industrial Temperature Range
S 20-Pin TSSOP or 14-Pin TDFN Package
12.5pF Crystals
Month, and Year with Leap Year Compensation
Valid Through 2099
3-Wire Interface
Addresses in Clock/RAM
Outputs
1.8V ±5%
3.0V±10%
3.3V ±10%
NOTE: SHOWN IN 3-WIRE I/O CONFIGURATION.
3-WIRE
PORT
P
RST
INT
Typical Operating Circuit
R
PU
INT0
PF
INT1
CE
SCLK
SDI
SDO
SERMODE
DS1343
DS1344
V
V
CC
CC
GND
V
BAT
Features
X1
X2