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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.
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| 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
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| 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
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| QV PDF |
SPI-Compatible RTC in a TDFN
MAX6902
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| 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) |
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DS32B35
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32.768kHz
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TCXO
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Digital
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CMOS Open-Drain
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2
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3.5
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1 (typ)
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5 (0-10 Years)
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2.7 to 3.63
3.3
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DS32C35
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32.768kHz
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TCXO
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Digital
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CMOS Open-Drain
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2
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3.5
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1 (typ)
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5 (0-10 Years)
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2.7 to 3.63
3.3
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| 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 |
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DS32B35
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YY-MM-DD/ HH:MM:SS
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I2C
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2.7 to 3.63
3.3
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840
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-
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FRAM
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2K
8K
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-
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DS32C35
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YY-MM-DD/ HH:MM:SS
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I2C
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2.7 to 3.63
3.3
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840
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-
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FRAM
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2K
8K
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-
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DS1394
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YY-MM-DD/ HH:MM:SS:hh
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SPI
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3.3
5
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500
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6
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None
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-
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1
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DS1390
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YY-MM-DD/ HH:MM:SS:hh
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SPI
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1.8
3
3.3
5
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500
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6
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None
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-
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1
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DS1391
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YY-MM-DD/ HH:MM:SS:hh
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SPI
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1.8
3
3.3
5
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500
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6
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None
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-
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1
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DS1392
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YY-MM-DD/ HH:MM:SS:hh
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3-Wire
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1.8
3
3.3
5
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500
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6
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None
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-
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1
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DS1393
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YY-MM-DD/ HH:MM:SS:hh
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3-Wire
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1.8
3
3.3
5
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500
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6
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None
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-
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1
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DS1340
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YY-MM-DD/ HH:MM:SS
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I2C
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1.8
3
3.3
5
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800
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12.5
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None
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-
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0
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DS1338
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YY-MM-DD/ HH:MM:SS
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I2C
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1.8
3
3.3
5
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800
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12.5
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NV SRAM
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56
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0
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DS1339
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YY-MM-DD/ HH:MM:SS
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I2C
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2
3
3.3
5
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400
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6
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None
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-
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2
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DS1337
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YY-MM-DD/ HH:MM:SS
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I2C
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2
3
3.3
5
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425
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6
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None
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-
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2
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MAX6901
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YYYY-MM-DD/ HH:MM:SS
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3-Wire
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2
3
3.3
5
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600
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12.5
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NV SRAM
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31
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1
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MAX6902
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YYYY-MM-DD/ HH:MM:SS
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SPI
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2
3
3.3
5
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600
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12.5
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NV SRAM
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31
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1
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| See All Timekeeping & Real-Time Clocks (85) |
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