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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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 - -
PCF8523TK/1,118
PCF8523TK/1,118 - RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS) I2C, 1.2V to 5.5V, HVSON-8

68X3136

RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS) I2C, 1.2V to 5.5V, HVSON-8

NXP

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1.2V 5.5V HVSON 8Pins I2C -40°C 85°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 - -
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 - -
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 - -
MCP79410-I/ST
MCP79410-I/ST - Real-Time Clock IC, I2C, Serial, 1.8 to 5.5 V, -40°C to 85°C, TSSOP

75T7447

Real-Time Clock IC, I2C, Serial, 1.8 to 5.5 V, -40°C to 85°C, TSSOP

MICROCHIP

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0 0 0 1.8V 5.5V 0 8Pins 0 -40°C 85°C - 0
PCF8563TS/4,118
PCF8563TS/4,118 - Real Time Clock/Calendar IC, Alarm, I2C, HH:MM:SS, Day; Date; Month; Year, 1 V to 5.5 V, TSSOP-8

52X6198

Real Time Clock/Calendar IC, Alarm, I2C, HH:MM:SS, Day; Date; Month; Year, 1 V to 5.5 V, 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 - -
MCP7940N-I/SN
MCP7940N-I/SN - Real-Time Clock IC, YYYY:MM:WK:DD:HR:MIN:SECS, 12/24HR, 1.8 to 5.5 V, -40°C to 85°C

12X8716

Real-Time Clock IC, YYYY:MM:WK:DD:HR:MIN:SECS, 12/24HR, 1.8 to 5.5 V, -40°C to 85°C

MICROCHIP

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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 0 5.5V SOIC 0 I2C -40°C 85°C 0 0
M41T00SM6F
M41T00SM6F - REAL TIME CLOCK/CALENDAR, BINARY, SOIC-8

72Y1097

REAL TIME CLOCK/CALENDAR, BINARY, SOIC-8

STMICROELECTRONICS

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DD:MM:YYYY ss:mm:hh RTC 2.7V 5.5V SOIC 8Pins I2C -40°C 85°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 - -
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 - -
PCF85063ATL/1,118
PCF85063ATL/1,118 - RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS) I2C, 0.9V to 5.5V, HXSON-10

68X3133

RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS) I2C, 0.9V to 5.5V, HXSON-10

NXP

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Day; Date; Month; Year HH:MM:SS Alarm RTC 900mV 5.5V DFN 10Pins I2C -40°C 85°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 - -
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 - -
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 - -
DS1307ZN+
DS1307ZN+ - RTC, Date Time Format (Day/Date/Month/Year, HH:MM:SS), I2C, Serial, 4.5V to 5.5V Supply, SOIC-8

68AC5064

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

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Day; Date; Month; Year HH:MM:SS RTC 4.5 5.5 SOIC 8 I2C -40 85 - -
PCF2123TS/1,118
PCF2123TS/1,118 - RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS, Binary) SPI, 1.1V to 5.5V, TSSOP-14

31AC6844

RTC, Clock/Calendar, Date Time Format (YYYY-MM-DD-dd, HH:MM:SS, Binary) SPI, 1.1V to 5.5V, TSSOP-14

NXP

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Day; Date; Month; Year HH:MM:SS Alarm RTC 1.1V 5.5V TSSOP 14Pins SPI -40°C 85°C - -
DS12887A+
DS12887A+ - RTC, Date Time Format (Day/Date/Month/Year HH:MM:SS), Parallel, 4.5V to 5.5 V, EDIP-24

79Y4481

RTC, Date Time Format (Day/Date/Month/Year HH:MM:SS), Parallel, 4.5V to 5.5 V, EDIP-24

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Day; Date; Month; Year HH:MM:SS RTC 4.5V 5.5V EDIP 24Pins Bytewide 0°C 70°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 2.3 5.5 SOIC 16 I2C 0 70 - -
MCP79410T-I/MNY
MCP79410T-I/MNY - RTC CLK/CALENDAR, I2C, TDFN-8

55AC2745

RTC CLK/CALENDAR, I2C, TDFN-8

MICROCHIP

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0 0 0 0 5.5V 0 0 0 -40°C 85°C - 0
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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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 2.3 5.5 WSOIC 16 I2C 0 70 - -