DS1672
I2C 32-Bit Binary Counter RTC
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
The DS1672 incorporates a 32-bit counter and ꢀ 32-Bit Counter
ꢀ I2C* Serial Interface
power-monitoring functions. The 32-bit counter
is designed to count seconds and can be used to
derive time-of-day, week, month, month, and
year by using a software algorithm. A precision,
ꢀ Automatic Power-Fail Detect and Switch
Circuitry
ꢀ Power-Fail Reset Output
temperature-compensated
reference
and
comparator circuit monitors the status of VCC.
When an out-of-tolerance condition occurs, an
internal power-fail signal is generated that forces
the reset to the active state. When VCC returns to
an in-tolerance condition, the reset signal is kept
in the active state for a period of time to allow
the power supply and processor to stabilize.
ꢀ Low-Voltage Oscillator Operation
(1.3V min)
ꢀ Trickle-Charge Capability
ꢀ Underwriters Laboratory (UL) Recognized
ꢀ -40°C to +85°C Operating Temperature
Range
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
TOP VIEW
X1
X2
1
8
VCC
DS16727
2
RST
SCL
SDA
VBACKUP
GND
3
4
6
5
DIP
SO
µSOP
*Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed 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 defined by Philips.
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