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DS1340C-18+-DS1340C-3+-DS1340C-33-DS1340Z-1.8-DS1340Z-3.3-DS1340Z-33-DS1340Z-33+
I2C RTC with Trickle Charger
General DescriptionThe 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 VBACKUPpin, 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. The device is programmed serially through
an I2CTMbidirectional bus.
ApplicationsPortable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
FeaturesEnhanced Second Source for the ST M41T00Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)Fast (400kHz) I2C InterfaceSoftware Clock CalibrationRTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and YearAutomatic Power-Fail Detect and Switch CircuitryTrickle-Charge CapabilityLow Timekeeping Voltage Down to 1.3VThree Operating Voltage Ranges (1.8V, 3V, and 3.3V)Oscillator Stop FlagAvailable in 8-Pin µSOP or SO PackagesUnderwriters Laboratory (UL) Recognized
DS13402C RTC with Trickle Charger
Ordering Information
Typical Operating CircuitRev 2; 12/04
I2C is a trademark of Philips Corp. Purchase of I2C compo-
nentsfrom Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I2C Patent Rights to use these components in an I2C
system, provided that the system conforms to the I2C Standard
Specification as defined by Philips.
Note: A "+" in the part number and a "+" anywhere on the top
mark indicates a lead-free device.
Pin Configurations appear at end of data sheet.
DS13402C RTC with Trickle Charger
ABSOLUTE MAXIMUM RATINGSStresses 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 VCCPin Relative to Ground.....-0.3V to +6.0V
Voltage Range on SDA, SCL, and FT/OUT
Relative to Ground..................................-0.3V to (VCC+ 0.3V)
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature Range............................See IPC/JEDEC
J-STD-020 Specification
AC ELECTRICAL CHARACTERISTICS
DS13402C RTC with Trickle Charger
RECOMMENDED DC OPERATING CONDITIONS(VCC= VCC MINto VCC MAX, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C, unless
DC ELECTRICAL CHARACTERISTICS(VCC= 0V, VBACKUP= 3.7V, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
DS13402C RTC with Trickle Charger
POWER-UP/POWER-DOWN CHARACTERISTICS
WARNING:Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup mode.
Note 1:Limits at -40°C are guaranteed by design and not production tested.
Note 2:After this period, the first clock pulse is generated.
Note 3:A device must internally provide a hold time of at least 300ns for the SDA signal (referred to as the VIH(MIN)of the SCL
signal) to bridge the undefined region of the falling edge of SCL.
Note 4:The maximum tHD:DATonly has to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 5:A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT≥to 250ns must be met. This
is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the
low period of the SCL signal, it must output the next data bit to the SDA line tR MAX+ tSU:DAT = 1000 + 250 = 1250ns
before the SCL line is released.
Note 6:CB—total capacitance of one bus line in pF.
Note 7:The parameter tOSFis the period of time the oscillator must be stopped for the OSF flag to be set over the 0V ≤VCC≤
VCCMAXand 1.3V ≤VBAT≤ 3.7V range.
Note 8:All voltages are referenced to ground.
Note 9:Measured at VCC= typ, VBACKUP= 0V, register 08h = A5h.
Note 10:The use of the 250Ωtrickle-charge resistor is not allowed at VCC> 3.63V and should not be enabled.
Note 11:Measured at VCC= typ, VBACKUP= 0V, register 08h = A6h.
Note 12:Measured at VCC= typ, VBACKUP= 0V, register 08h = A7h.
Note 13:ICCA—SCL clocking at max frequency = 400kHz.
Note 14:Specified with I2C bus inactive.
Note 15:Measured with a 32.768kHz crystal attached to the X1 and X2 pins.
Note 16:Limits at +25°C are guaranteed by design and not production tested.
Note 17:This delay applies only if the oscillator is enabled and running. If the oscillator is disabled or stopped, no power-up delay
occurs.
Figure 1. Data Transfer on I2C Serial Bus
DS13402C RTC with Trickle ChargerFigure 2. Power-Up/Power-Down Timing
Typical Operating Characteristics(VCC= +3.3V, TA= +25°C, unless otherwise noted.)
