DS1375 Datasheet, PDF (1/13 Pages) Dallas Semiconductor – 2-Wire Digital Input RTC with Alarm

Rev 2; 9/08
I²C Digital Input RTC with Alarm
General Description
The DS1375 digital real-time clock (RTC) is a low-power
clock/calendar that does not require a crystal. The
device operates from a digital clock input pin at one of
four frequencies: 32.768kHz, 8.192kHz, 60Hz, or 50Hz.
It maintains seconds, minutes, hours, day, date, month,
and year information. The date at the end of the month
is automatically adjusted for months with fewer than 31
days, including corrections for leap year. The clock
operates in either the 24-hour or 12-hour format with an
AM/PM indicator. Two programmable time-of-day/date
alarms, a programmable square-wave output, and 16
bytes of SRAM are provided. Address and data are
transferred serially through an I²C bidirectional bus.
Applications
RTC Complement to the DS32kHz TCXO
Utility Meters
Appliances
Consumer Electronics
Automotive
Features
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation
Valid Up to 2100
♦ Two Programmable Alarms
♦ Programmable Square-Wave Output
♦ Operates from a 32.768kHz, 8.192kHz, 60Hz, or
50Hz Digital Clock Signal
♦ 16 Bytes of SRAM
♦ Fast (400kHz) I²C Interface
♦ 1.7V to 5.5V Operation
Ordering Information
PART TEMP RANGE PIN-PACKAGE TOP MARK
DS1375T+ -40°C to +85°C 6 TDFN-EP*
DS1375
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
+3V
RPU = t_r/C_B
RPU RPU
CPU
INT
V_CC
SCL
CLK
SCA
DS1375
SQWINT
GND
V_BAT
V_CC
DS32kHz
GND
TOP VIEW
Pin Configuration
+
CLK 1
SQW/INT 2
GND 3
6 V_CC
DS1375
5 SCL
*EP
4 SDA
*EXPOSED PAD
TDFN
(3mm × 3mm)
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