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GENERAL DESCRIPTION
The DS1672 incorporates a 32-bit counter and
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,
temperature-compensated reference and
comparator circuit monitors the status of V
CC
.
When an out-of-tolerance condition occurs, an
internal power-fail signal is generated that forces
the reset to the active state. When V
CC
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.
FEATURES
32-Bit Counter
I
2
C Serial Interface
Automatic Power-Fail Detect and Switch
Circuitry
Power-Fail Reset Output
Low-Voltage Oscillator Operation
(1.3V min)
Trickle-Charge Capability
Underwriters Laboratories (UL) Recognized
-40°C to +85°C Operating Range
PIN CONFIGURATION
.
TYPICAL OPERATING CIRCUIT
SO
SOP
CC
2
C 32-Bit Binary Counter RTC
