Real Time Clocks

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Real-Time Clock products offer a diverse range of real-time clock (RTC) solutions for networking and embedded applications. The primary function of RTC is to keep time and calendar data.

We offer Real Time Clock (RTC) functions including Alarm RTC, Binary Counter, Real Time Calendar Clock (RTCC), Elapsed Time Recorder and Real Time Event Recorder.

Use of a hardware RTC allows microcontrollers like the Raspberry Pi to be used without internet access and still provide services that use time stamps. For example, the DS1307 is a commonly available I2C based RTC module – so using the DS1307’s I2C protocol, which is supported by the Raspberry Pi, real time clock support can easily and cost-effectively be added.

Another popular RTC module, also with I2C support, is the DS3231. The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when mains power to the device is interrupted. Accuracy is ±2ppm from 0°C to +40°C, and ±3.5ppm from -40°C to +85°C.

Apart from I2C, other interface types include 2 wire, 3 wire, 4 wire, Motorola Serial Peripheral Interface (SPI), Bytewide, Parallel, Multiplexed, and Phantom Clock.

Operating temperatures range from -40°C minimum to +125°C maximum. Products are available to the AEC-Q100 Automotive Qualification Standard.
 
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DS1302S+
DS1302S+ - RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, SOIC-8

2519293

RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, SOIC-8

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DS1337+
DS1337+ - RTC IC, Date Time Format (Day/Date/Month/Year ss:mm:hh), I2C, Serial, 1.8 V to 5.5 V, DIP-8

2518743

RTC IC, Date Time Format (Day/Date/Month/Year ss:mm:hh), I2C, Serial, 1.8 V to 5.5 V, DIP-8

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RV-8564-C2
RV-8564-C2 - RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.2 V to 5.5 V, SON-10

1539389

RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.2 V to 5.5 V, SON-10

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1539389RL in Re-reel

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MAX31328NELB+
MAX31328NELB+ - Real Time Clock, Alarm RTC, I2C, 12Hr / 24Hr, 2.3 V to 5.5 V, LGA-10, -40 °C to 85 °C

3677599

Real Time Clock, Alarm RTC, I2C, 12Hr / 24Hr, 2.3 V to 5.5 V, LGA-10, -40 °C to 85 °C

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Day; Date; Month; Year 12Hr / 24Hr Alarm RTC - - LGA - I2C - - -
DS17887-5+
DS17887-5+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V, EDIP-24

2515438

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V, EDIP-24

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Day; Date; Month; Year HH:MM:SS Alarm RTC 4.5V 5.5V EDIP 24Pins Multiplexed 0°C 70°C -
M48T37V-10MH1F
M48T37V-10MH1F - RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Parallel, 3V to 3.6V Supply, SOIC-44

3129609

RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Parallel, 3V to 3.6V Supply, SOIC-44

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Day; Date; Month; Year; Century HH:MM:SS RTC - - SOIC - Parallel - - -
DS1388Z-33+
DS1388Z-33+ - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), I2C, 2.97 V to 3.63 V, NSOIC-8

2515353

RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), I2C, 2.97 V to 3.63 V, NSOIC-8

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M48T58Y-70MH1F
M48T58Y-70MH1F - RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28

2849896

RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28

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YY-MM-DD-dd HH:MM:SS Calendar, Clock 4.5V 5.5V SOIC 28Pins Parallel 0°C 70°C -
DS1248Y-70+
DS1248Y-70+ - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Bytewide, 4.5 V to 5.5 V, EDIP-32

2515444

RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Bytewide, 4.5 V to 5.5 V, EDIP-32

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DS1672U-33+
DS1672U-33+ - RTC IC, Date Time Format (Binary), I2C, 2.97 V to 3.63 V, µSOP-8

2515400

RTC IC, Date Time Format (Binary), I2C, 2.97 V to 3.63 V, µSOP-8

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DS1342U+
DS1342U+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, µSOP-8

2515385

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, µSOP-8

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DS1501YZ+
DS1501YZ+ - RTC IC, Date Time Format (Day/Date/Month/Year/Century hh:mm:ss), Bytewide, 4.5 V to 5.5 V, WSOIC-28

2515419

RTC IC, Date Time Format (Day/Date/Month/Year/Century hh:mm:ss), Bytewide, 4.5 V to 5.5 V, WSOIC-28

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RV-8564-C2
RV-8564-C2 - RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.2 V to 5.5 V, SON-10

1539389RL

RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.2 V to 5.5 V, SON-10

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DS17487-5+
DS17487-5+ - Alarm RTC IC, Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V supply, EDIP-24

2515436

Alarm RTC IC, Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V supply, EDIP-24

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Day; Date; Month; Year HH:MM:SS Alarm RTC 4.5V 5.5V EDIP 24Pins Multiplexed 0°C 70°C -
DS1744W-120+
DS1744W-120+ - RTC, Timekeeper NVSRAM, Bytewide, 2.97 V to 3.63 V, EDIP-28

2515517

RTC, Timekeeper NVSRAM, Bytewide, 2.97 V to 3.63 V, EDIP-28

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DS1340U-33+
DS1340U-33+ - Real Time Clock/Calendar IC, Trickle Charger, I2C, HH:MM:SS, Day; Date; Month; Year, 5.5 V, µSOP-8

2515382

Real Time Clock/Calendar IC, Trickle Charger, I2C, HH:MM:SS, Day; Date; Month; Year, 5.5 V, µSOP-8

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Day; Date; Month; Year HH:MM:SS RTC - - µSOP - I2C - - -
DS1392U-33+
DS1392U-33+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.97 V to 5.5 V, µSOP-10

2515397

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.97 V to 5.5 V, µSOP-10

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DS1744WP-120IND+
DS1744WP-120IND+ - RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Bytewide, 2.97V to 3.63V, PWRCP-34

2515498

RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Bytewide, 2.97V to 3.63V, PWRCP-34

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DS1391U-3+
DS1391U-3+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.7 V to 3.3 V, µSOP-10

2515394

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.7 V to 3.3 V, µSOP-10

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M48T58Y-70MH1F
M48T58Y-70MH1F - RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28

2849896RL

RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28

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YY-MM-DD-dd HH:MM:SS Calendar, Clock 4.5V 5.5V SOIC 28Pins Parallel 0°C 70°C -
M48T37V-10MH1F
M48T37V-10MH1F - RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Parallel, 3V to 3.6V Supply, SOIC-44

3129609RL

RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Parallel, 3V to 3.6V Supply, SOIC-44

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Day; Date; Month; Year; Century HH:MM:SS RTC - - SOIC - Parallel - - -
MCP79410-I/SN
MCP79410-I/SN - Battery Backed I2C Real Time Clock/Calendar with EEPROM and Unique ID in SOIC-8 Package

1823155

Battery Backed I2C Real Time Clock/Calendar with EEPROM and Unique ID in SOIC-8 Package

MICROCHIP

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MCP7940N-I/SN
MCP7940N-I/SN - Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, SOIC-8

2361122

Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, SOIC-8

MICROCHIP

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- - - 1.8V 5.5V - 8Pins - -40°C 85°C -
DS1307+
DS1307+ - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, Serial, 4.5 V to 5.5 V, DIP-8

2515369

RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, Serial, 4.5 V to 5.5 V, DIP-8

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DS1307N+
DS1307N+ - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 4.5 V to 5.5 V, DIP-8

2515371

RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 4.5 V to 5.5 V, DIP-8

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