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 VBACKUP pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional registers,
which are accessed individually, are required for
the trickle charger and flag. The clock/calendar provides
seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the backup
supply. The device is programmed serially through
an I²C* bidirectional bus.
Key Features
Applications/Uses
Enhanced Second Source for the ST M41T00
Available in a Surface-Mount Package with an Integrated Crystal (DS1340C)
Fast (400kHz) I²C 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)
Notes: *This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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