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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Q418564710001
Q418564710001 - RTC IC, YYYY:MM:DD:Hr:Min:Secs, 12Hr / 24Hr, 1.8 V to 5.5 V, VSOJ, 20Pins, I2C

26M2657

RTC IC, YYYY:MM:DD:Hr:Min:Secs, 12Hr / 24Hr, 1.8 V to 5.5 V, VSOJ, 20Pins, I2C

EPSON

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YYYY:MM:DD:Hr:Min:Secs 12Hr / 24Hr RTC 1.8V 5.5V VSOJ 20Pins I2C -40°C 85°C - -
M48T58-70PC1
M48T58-70PC1 - RTC, Timekeeper NVSRAM, Parallel, 4.75 V to 5.5 V, DIP-28

08N6564

RTC, Timekeeper NVSRAM, Parallel, 4.75 V to 5.5 V, DIP-28

STMICROELECTRONICS

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YY-MM-DD-dd HH:MM:SS Timekeeper 4.75V 5.5V DIP 28Pins - 0°C 70°C - -
DS1251Y-70+
DS1251Y-70+ - RTC W/ NVSRAM, 4096KB, HH:MM:SS:HH, EDIP

73Y1182

RTC W/ NVSRAM, 4096KB, HH:MM:SS:HH, EDIP

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Day; Date; Month; Year HH:MM:SS:hh RTC 4.5V 5.5V EDIP 32Pins Bytewide 0°C 70°C - -
DS1302Z+T&R
DS1302Z+T&R - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, NSOIC-8

73Y1199

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

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Day; Date; Month; Year HH:MM:SS RTC 2V 5.5V NSOIC 8Pins Serial 0°C 70°C - -
DS1394U-33+T&R
DS1394U-33+T&R - RTC, Day/Date/Month/Year, HH:MM:SS:hh, Alarm RTC, SPI, 2.97 V to 5.5 V Supply, µSOP-10

73Y1268

RTC, Day/Date/Month/Year, HH:MM:SS:hh, Alarm RTC, SPI, 2.97 V to 5.5 V Supply, µSOP-10

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Day; Date; Month; Year HH:MM:SS:hh Alarm RTC 2.97V 5.5V µSOP 10Pins SPI -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

73Y1206

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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Day; Date; Month; Year HH:MM:SS RTC 4.5V 5.5V DIP 8Pins I2C, Serial 0°C 70°C - -
MCP79410-I/ST
MCP79410-I/ST - RTCC, 12C, 1K EE, 64B SRAM,8TSSOP

75T7447

RTCC, 12C, 1K EE, 64B SRAM,8TSSOP

MICROCHIP

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- - RTC 1.8V 5.5V TSSOP 8Pins I2C, Serial -40°C 85°C - AEC-Q100
DS3231MZ+
DS3231MZ+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V, NSOIC-8

73Y1624

Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V, NSOIC-8

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Day; Date; Month; Year HH:MM:SS Alarm RTC 2.3V 5.5V NSOIC 8Pins I2C -40°C 85°C - -
PCF8563TS/4,118
PCF8563TS/4,118 - RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS, Binary) I2C, 1V to 5.5V, TSSOP-8

52X6198

RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS, Binary) I2C, 1V to 5.5V, TSSOP-8

NXP

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1V 5.5V TSSOP 8Pins I2C -40°C 85°C - -
DS3231S#
DS3231S# - Real Time Clock IC, YY-MM-DD, HH:MM:SS, 2.3 to 5.5 V, WSOIC-16, I2C, 0°C to 70°C

78Y4800

Real Time Clock IC, YY-MM-DD, HH:MM:SS, 2.3 to 5.5 V, WSOIC-16, I2C, 0°C to 70°C

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YY-MM-DD HH:MM:SS RTC 2.3V 5.5V WSOIC 16Pins I2C 0°C 70°C - -
DS12C887+
DS12C887+ - Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V, EDIP-24

73Y1079

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 - 24Pins Multiplexed 0°C 70°C - -
DS1682S+T&R
DS1682S+T&R - Elapsed Time Recorder IC, Date Time Format, I2C, 2.5 V to 5.5 V, NSOIC-8

73Y1324

Elapsed Time Recorder IC, Date Time Format, I2C, 2.5 V to 5.5 V, NSOIC-8

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- - Elapsed Time Recorder 2.5V 5.5V NSOIC 8Pins I2C -40°C 85°C - -
DS12887+
DS12887+ - RTC, Date Time Format (Day/Date/Month/Year 12Hr/24Hr), Multiplexed, 4.5V to 5.5 V, DIP-24

78Y4773

RTC, Date Time Format (Day/Date/Month/Year 12Hr/24Hr), Multiplexed, 4.5V to 5.5 V, DIP-24

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Day; Date; Month; Year HH:MM:SS RTC 4.5V 5.5V EDIP 24Pins Multiplexed 0°C 70°C - -
DS1244Y-70+
DS1244Y-70+ - RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Parallel, 4.5 V to 5.5 V, EDIP-28

73Y1160

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

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Day; Date; Month; Year HH:MM:SS:hh RTC 4.5V 5.5V - 28Pins Parallel 0°C 70°C - -
DS1372U+
DS1372U+ - Binary Counter IC, Date Time Format (Binary), I2C, 2.4 V to 5.5 V, µSOP-8

73Y1249

Binary Counter IC, Date Time Format (Binary), I2C, 2.4 V to 5.5 V, µSOP-8

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Binary Binary - 2.4V 5.5V µSOP 8Pins I2C -40°C 85°C - -
MCP7940N-I/SN
MCP7940N-I/SN - RTCC, GP I2C, 64B SRAM, 8SOIC

12X8716

RTCC, GP I2C, 64B SRAM, 8SOIC

MICROCHIP

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YYYY:MM:WK:DD:Hr:Min:Secs 12Hr / 24Hr Alarm RTC 1.8V 5.5V SOIC 8Pins I2C -40°C 85°C - AEC-Q100
PCF2129T/2,518
PCF2129T/2,518 - ALARM RTC, -40 TO 85DEG C, SOIC-16

61X9856

ALARM RTC, -40 TO 85DEG C, SOIC-16

NXP

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YYYY:MM:WK:DD:Hr:Min:Secs Binary Calendar, Clock 1.8V 4.2V SOIC 16Pins I2C, SPI -40°C 85°C - -
PCF8523T/1,118
PCF8523T/1,118 - ALARM RTC, -40 TO 85DEG C, SOIC-8

52X6196

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

NXP

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YYYY:MM:WK:DD:Hr:Min:Secs Binary Calendar, Clock 1.2V 5.5V SOIC 8Pins I2C -40°C 85°C - -
DS1243Y-120+
DS1243Y-120+ - RTC W/ NVSRAM, 64KB, HH:MM:SS:HH, EDIP28

73Y1159

RTC W/ NVSRAM, 64KB, HH:MM:SS:HH, EDIP28

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Day; Date; Month; Year HH:MM:SS:hh RTC 4.5V 5.5V EDIP 28Pins Parallel 0°C 70°C - -
PCF8563T/5,518
PCF8563T/5,518 - ALARM RTC, -40 TO 85DEG C, SOIC-8

31AC6855

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

NXP

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YYYY:MM:WK:DD:Hr:Min:Secs Binary Calendar, Clock 1V 5.5V SOIC 8Pins I2C -40°C 85°C - -
M41T0M6F
M41T0M6F - RTC, Day/Date/Month/Year/Century, HH:MM:SS, RTC, I2C, 2 V to 5.5 V Supply, SOIC-8

45AC7403

RTC, Day/Date/Month/Year/Century, HH:MM:SS, RTC, I2C, 2 V to 5.5 V Supply, SOIC-8

STMICROELECTRONICS

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Day; Date; Month; Year; Century HH:MM:SS RTC 2V 5.5V SOIC 8Pins I2C -40°C 85°C - -
DS1339C-33#
DS1339C-33# - REAL TIME CLOCK, 3.3V, I2C, SOIC-16

14AC3758

REAL TIME CLOCK, 3.3V, I2C, SOIC-16

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DD:MM:YY HH:MM:SS RTC 2.97V 5.5V SOIC 16Pins I2C -40°C 85°C - -
DS3231S#T&R
DS3231S#T&R - RTC, I2C, SERIAL, 5.5V, SOIC-16

38AC0955

RTC, I2C, SERIAL, 5.5V, SOIC-16

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Day; Date; Month; Year HH:MM:SS RTC 2.3V 5.5V SOIC 16Pins I2C 0°C 70°C - -
PCF8563T/F4,118
PCF8563T/F4,118 - ALARM RTC, I2C, 5.5V, SOIC-8

49AC5010

ALARM RTC, I2C, 5.5V, SOIC-8

NXP

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DD:MM:YY HH:MM:SS Alarm RTC 1.8V 5.5V SOIC 8Pins I2C -40°C 85°C - -
DS1307ZN+T&R
DS1307ZN+T&R - RTC, Date Time Format (Day/Date/Month/Year HH:MM:SS), I2C, 4.5V to 5.5V Supply, SOIC-8

38AC0918

RTC, Date Time Format (Day/Date/Month/Year HH:MM:SS), I2C, 4.5V to 5.5V Supply, SOIC-8

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Day; Date; Month; Year HH:MM:SS RTC 4.5V 5.5V SOIC 8Pins I2C -40°C 85°C - -