Product Summary

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 I2CTM bidirectional bus.

Features

? 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)
? Oscillator Stop Flag
? Available in 8-Pin μSOP or SO Packages
? Underwriters Laboratory (UL) Recognized

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS1340Z-33+T&R
DS1340Z-33+T&R
Maxim Integrated Products
Real Time Clock I2C RTC w/Trickle Charger
Data Sheet
0-1: $1.67
1-25: $1.58
25-50: $1.04
50-100: $0.86
Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS1300
DS1300
Other

Data Sheet
Negotiable 
DS1300-3
DS1300-3
Emerson / Astec Power
Linear and Switching Power Supplies 12V output, 1300W 2U x 3U x 7.5"
Data Sheet
0-4: $296.74
4-10: $285.51
10-25: $269.47
DS1301-7R
DS1301-7R

EURO-CASSETTE 100W 12V
Data Sheet
0-5: $629.64
DS1302
DS1302
Maxim Integrated Products
Real Time Clock Trickle-Charge Timekeeping Chip
Data Sheet
0-6900: $1.20
DS1302+
DS1302+
Maxim Integrated Products
Real Time Clock Trickle-Charge Timekeeping Chip
Data Sheet
0-1: $2.23
1-25: $1.50
25-50: $1.09
50-100: $1.07
DS1302N
DS1302N
Maxim Integrated Products
Real Time Clock Trickle-Charge Timekeeping Chip
Data Sheet
0-6910: $1.49