DS1672
I
2
C 32-Bit Binary Counter RTC
www.maxim-ic.com
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 Laboratory (UL) Recognized
-40°C to +85°C Operating Temperature
Range
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
TOP VIEW
X1
X2
V
BACKUP
GND
1
2
3
4
8
7
6
5
V
CC
RST
SCL
SDA
DS1672
DIP
SO
µSOP
*Purchase of I C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys a
2
license under the Philips I C Patent Rights to use these
2
components in an I C system, provided that the system conforms
2
to the I C Standard Specification defined by Philips.
2
1 of 15
REV: 031406
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
