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Maxim > Solutions > HVAC

Real-Time Clock

Provide time of day and support features such as Alarm, Periodic Interrupt, Square Wave, RESET, or watchdog timer.

DATA SHEETS
Display Title / Parts Key Advantages
QV  PDF Accurate I²C RTC with Integrated TCXO/Crystal/FRAM
DS32B35, DS32C35

Nonvolatile Memory Has No Backup Supply and No Write Cycle Limits
QV  PDF Low-Voltage SPI/3-Wire RTCs with Trickle Charger
DS1390, DS1391, DS1392, DS1393, DS1394

Low-Voltage SPI/3-Wire RTCs with Trickle Charger have the Broadest Feature Set and the Smallest Footprint in Their Class
QV  PDF I²C RTC with Trickle Charger
DS1340, DS1340C

I²C Real-Time Clock with Trickle Charger Offers Software Clock Calibration
QV  PDF I²C RTC with 56-Byte NV RAM
DS1338, DS1338C, DS1338U, DS1338Z

QV  PDF I²C Serial Real-Time Clock
DS1339, DS1339C, DS1339U

RTC Provides System Flexibility with Multiple Programmable Features
QV  PDF I²C Serial Real-Time Clock
DS1337, DS1337C

Industry's Smallest I²C RTC with Two Time-of-Day Alarms
QV  PDF 3-Wire Serial RTC in a TDFN
MAX6901

QV  PDF SPI-Compatible RTC in a TDFN
MAX6902




Key Specifications:   Oscillator Modules
Part Number Frequency Oscillator Type Tuning Adjustment Type Frequency Output Type Freq. Stability vs. Temp. @0 to +40°C (±ppm) Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm) Frequency Stability vs. Supply Voltage (±ppm/V) Frequency Stability vs. Aging (±ppm) Supply Voltage (V)
DS32B35  32.768kHz TCXO Digital CMOS Open-Drain 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 3.63
3.3
DS32C35  32.768kHz TCXO Digital CMOS Open-Drain 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 3.63
3.3
See All Oscillator Modules (28)

Key Specifications:   Timekeeping & Real-Time Clocks
Part Number Date/ Time Format (hh = sec/100) Interface Supply Voltage (V) Time- keeping Current (typ) (nA) CL, Load Capacitance (pF) Memory Type Memory Size (Bytes) Number of Time of Day Alarms
DS32B35  YY-MM-DD/ HH:MM:SS I2C 2.7 to 3.63
3.3
840  -  FRAM 2K
8K
 - 
DS32C35  YY-MM-DD/ HH:MM:SS I2C 2.7 to 3.63
3.3
840  -  FRAM 2K
8K
 - 
DS1394  YY-MM-DD/ HH:MM:SS:hh SPI 3.3
5
500 6 None  -  1
DS1390  YY-MM-DD/ HH:MM:SS:hh SPI 1.8
3
3.3
5
500 6 None  -  1
DS1391  YY-MM-DD/ HH:MM:SS:hh SPI 1.8
3
3.3
5
500 6 None  -  1
DS1392  YY-MM-DD/ HH:MM:SS:hh 3-Wire 1.8
3
3.3
5
500 6 None  -  1
DS1393  YY-MM-DD/ HH:MM:SS:hh 3-Wire 1.8
3
3.3
5
500 6 None  -  1
DS1340  YY-MM-DD/ HH:MM:SS I2C 1.8
3
3.3
5
800 12.5 None  -  0
DS1338  YY-MM-DD/ HH:MM:SS I2C 1.8
3
3.3
5
800 12.5 NV SRAM 56 0
DS1339  YY-MM-DD/ HH:MM:SS I2C 2
3
3.3
5
400 6 None  -  2
DS1337  YY-MM-DD/ HH:MM:SS I2C 2
3
3.3
5
425 6 None  -  2
MAX6901  YYYY-MM-DD/ HH:MM:SS 3-Wire 2
3
3.3
5
600 12.5 NV SRAM 31 1
MAX6902  YYYY-MM-DD/ HH:MM:SS SPI 2
3
3.3
5
600 12.5 NV SRAM 31 1
See All Timekeeping & Real-Time Clocks (85)



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