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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AB-RTCMC-32.768KHZ-AIGZ-S7-T
AB-RTCMC-32.768KHZ-AIGZ-S7-T - REAL TIME CLOCK, I2C, -40 TO 85DEG C ROHS COMPLIANT: YES

73AJ0500

REAL TIME CLOCK, I2C, -40 TO 85DEG C ROHS COMPLIANT: YES

ABRACON

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YY-MM-DD-dd HH:MM:SS:hh RTC 1.3V 4.4V CLCC 8Pins I2C -40°C 85°C - -
MCP79410-I/SN
MCP79410-I/SN - Real-Time Clock IC, DD:MM:YYHH:MM:SS, I2C, 1.8 to 5.5 V, -40°C to 85°C, SOIC

20T6027

Real-Time Clock IC, DD:MM:YYHH:MM:SS, I2C, 1.8 to 5.5 V, -40°C to 85°C, SOIC

MICROCHIP

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DD:MM:YY HH:MM:SS RTC 0 5.5V SOIC 8 I2C -40°C 85°C MCP79410 MCP79411 MCP79412 AEC-Q100
MCP7940M-I/SN
MCP7940M-I/SN - Real-Time Clock IC, DD:MM:YYYYHH:MM:SS, I2C, 1.8 to 5.5 V, -40°C to 85°C, SOIC

93T1810

Real-Time Clock IC, DD:MM:YYYYHH:MM:SS, I2C, 1.8 to 5.5 V, -40°C to 85°C, SOIC

MICROCHIP

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0 0 0 1.8V 5.5V 0 8Pins 0 -40°C 85°C - 0
ISL12026IBZ-T
ISL12026IBZ-T - ALARM RTC, -40 TO 85DEG C, NSOIC-8

84AC6856

ALARM RTC, -40 TO 85DEG C, NSOIC-8

RENESAS

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Day; Date; Month; Year HH:MM:SS Alarm RTC 2.7V 5.5V NSOIC 8Pins I2C -40°C 85°C - -
MCP79411-I/MS
MCP79411-I/MS - RTC, 1KBIT/64B, I2C, MSOP-8

30AC9818

RTC, 1KBIT/64B, I2C, MSOP-8

MICROCHIP

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1.8V 5.5V MSOP 8Pins I2C -40°C 85°C - -
M41T82SM6F
M41T82SM6F - RTC, Day/Date/Month/Year/Century, HH:MM:SS:hh, Alarm RTC, I2C, 3 V to 5.5 V Supply, SOIC-8

45AC7409

RTC, Day/Date/Month/Year/Century, HH:MM:SS:hh, Alarm RTC, I2C, 3 V to 5.5 V Supply, SOIC-8

STMICROELECTRONICS

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Day; Date; Month; Year; Century HH:MM:SS:hh Alarm RTC 3 5.5 SOIC 8 I2C -40 85 - -
RV-8523-C3-TA-QC-020
RV-8523-C3-TA-QC-020 - RTC, SPI, RV-8564, 20PPM, 10SON

09X0518

RTC, SPI, RV-8564, 20PPM, 10SON

MICRO CRYSTAL

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Day; Date; Month; Year; Century 24Hr RTC 1.2V 5.5V SON 10Pins I2C -40°C 85°C - -
DS1339AU+
DS1339AU+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.71 V to 5.5 V, µSOP-8

73Y1227

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.71 V to 5.5 V, µSOP-8

ANALOG DEVICES

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1.71V 5.5V µSOP 8Pins I2C -40°C 85°C - -
X1B0002320001
X1B0002320001 - RTC/CALENDAR, RX6110SA, I2C/SPI, SOP-14

87X6752

RTC/CALENDAR, RX6110SA, I2C/SPI, SOP-14

EPSON

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- - - 0 5.5V - 0 - -40°C 85°C - -
DS1337S+T&R
DS1337S+T&R - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, NSOIC-8

73Y1215

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

ANALOG DEVICES

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1.8V 5.5V NSOIC 8Pins I2C -40°C 85°C - -
DS1746-70+
DS1746-70+ - RTC W/ NV SRAM, 128KB, EDIP-32

73Y1373

RTC W/ NV SRAM, 128KB, EDIP-32

ANALOG DEVICES

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Day; Date; Month; Year; Century HH:MM:SS RTC 4.5V 5.5V EDIP 32Pins Bytewide 0°C 70°C - -
DS1744WP-120IND+
DS1744WP-120IND+ - RTC W/NV SRAM, 32KB, PWRCP-34

73Y1372

RTC W/NV SRAM, 32KB, PWRCP-34

ANALOG DEVICES

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- - - 0 0 - 0 - -40°C 85°C - -
MCP79401-I/SN
MCP79401-I/SN - RTCC, GP I2C, 64B SRAM, ID, 8SOIC

12X8720

RTCC, GP I2C, 64B SRAM, ID, 8SOIC

MICROCHIP

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0 0 0 0 5.5V 0 0 0 -40°C 85°C - 0
MCP79512-I/MS
MCP79512-I/MS - RTC, SERIAL SPI, 3.6V, MSOP-10

44AC2581

RTC, SERIAL SPI, 3.6V, MSOP-10

MICROCHIP

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0 0 0 0 3.6V 0 0 0 -40°C 85°C - 0
MCP7940MT-I/SN
MCP7940MT-I/SN - RAL TIME CLOCK W/ SRAM, 64B, SOIC-8

10AC8049

RAL TIME CLOCK W/ SRAM, 64B, SOIC-8

MICROCHIP

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- - - 0 5.5V - 0 - -40°C 85°C - -
DS1308U-3+
DS1308U-3+ - RTC, I2C, SERIAL, 5.5V, USOP-8

38AC0919

RTC, I2C, SERIAL, 5.5V, USOP-8

ANALOG DEVICES

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Day; Date; Month; Year HH:MM:SS RTC 2.7V 5.5V µSOP 8Pins I2C -40°C 85°C - -
M41ST85WMH6F
M41ST85WMH6F - SOH28/I°/512BIT BATTERY/RTC + SUPERVISOR

51AC9307

SOH28/I°/512BIT BATTERY/RTC + SUPERVISOR

STMICROELECTRONICS

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0 0 0 0 3.6V 0 0 0 -40°C 85°C - 0
DS1308U-33+T
DS1308U-33+T - LOW-CURRENT IC RTC WITH 56-BYTE NV RAM ROHS COMPLIANT: YES

12AJ8308

LOW-CURRENT IC RTC WITH 56-BYTE NV RAM ROHS COMPLIANT: YES

ANALOG DEVICES

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Day; Date; Month; Year HH:MM:SS RTC 3V 5.5V µSOP 8Pins I2C -40°C 85°C - -
DS1305E+T&R
DS1305E+T&R - ALARM RTC, 0 TO 70DEG C ROHS COMPLIANT: YES

68AH9616

ALARM RTC, 0 TO 70DEG C ROHS COMPLIANT: YES

ANALOG DEVICES

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YY-MM-DD-dd HH:MM:SS Alarm RTC 2V 5.5V TSSOP 20Pins SPI 0°C 70°C - -
DS1338C-33#T&R
DS1338C-33#T&R - RTC, -40 TO 85DEG C ROHS COMPLIANT: YES

68AH9618

RTC, -40 TO 85DEG C ROHS COMPLIANT: YES

ANALOG DEVICES

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YY-MM-DD HH:MM:SS RTC 3V 5.5V SOIC 16Pins I2C -40°C 85°C - -
PCA85073ADP/Q900Z
PCA85073ADP/Q900Z - RTCC, -40 TO 105DEG C ROHS COMPLIANT: YES

64AH7103

RTCC, -40 TO 105DEG C ROHS COMPLIANT: YES

NXP

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YYYY-MM-DD HH:MM:SS RTCC 900mV 5.5V TSSOP 8Pins I2C -40°C 105°C - AEC-Q100
AB0815-T3
AB0815-T3 - REAL TIME CLOCK, I2C/SPI, -40 TO 85DEG C ROHS COMPLIANT: YES

73AJ0971

REAL TIME CLOCK, I2C/SPI, -40 TO 85DEG C ROHS COMPLIANT: YES

ABRACON

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YY-MM-DD-dd HH:MM:SS:hh RTC 1.5V 3.6V QFN-EP 16Pins SPI -40°C 85°C - -
AB-RTCMC-32.768KHZ-IBO5-S3-T
AB-RTCMC-32.768KHZ-IBO5-S3-T - REAL TIME CLOCK, I2C, -40 TO 85DEG C ROHS COMPLIANT: YES

73AJ0506

REAL TIME CLOCK, I2C, -40 TO 85DEG C ROHS COMPLIANT: YES

ABRACON

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YY-MM-DD-dd HH:MM:SS RTC 1.5V 3.6V Module 10Pins I2C -40°C 85°C - -
MCP7940M-I/MS
MCP7940M-I/MS - RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, MSOP-8

79T6323

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

MICROCHIP

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DD:MM:YYYY HH:MM:SS RTC 1.8V 5.5V MSOP 8Pins I2C -40°C 85°C - AEC-Q100
MCP79400-I/SN
MCP79400-I/SN - RTCC, GP I2C, 64B SRAM, ID, 8SOIC

12X8719

RTCC, GP I2C, 64B SRAM, ID, 8SOIC

MICROCHIP

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0 0 0 0 5.5V 0 0 0 -40°C 85°C - 0