Real Time Clocks
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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.
| Manufacturer Part No | Newark Part No. | Description / Manufacturer | Availability | Price for: |
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Q418564710001
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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
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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+
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73Y1182 |
RTC W/ NVSRAM, 4096KB, HH:MM:SS:HH, EDIP ANALOG DEVICES
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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
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73Y1199 |
RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, NSOIC-8 ANALOG DEVICES
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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
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73Y1268 |
RTC, Day/Date/Month/Year, HH:MM:SS:hh, Alarm RTC, SPI, 2.97 V to 5.5 V Supply, µSOP-10 ANALOG DEVICES
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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 | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1307+
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73Y1206 |
RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, Serial, 4.5 V to 5.5 V, DIP-8 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | RTC | 4.5V | 5.5V | DIP | 8Pins | I2C, Serial | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MCP79410-I/ST
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75T7447 |
RTCC, 12C, 1K EE, 64B SRAM,8TSSOP MICROCHIP
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1+ $1.55 |
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- | - | RTC | 1.8V | 5.5V | TSSOP | 8Pins | I2C, Serial | -40°C | 85°C | - | AEC-Q100 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS3231MZ+
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73Y1624 |
Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V, NSOIC-8 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | Alarm RTC | 2.3V | 5.5V | NSOIC | 8Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PCF8563TS/4,118
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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#
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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 ANALOG DEVICES
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YY-MM-DD | HH:MM:SS | RTC | 2.3V | 5.5V | WSOIC | 16Pins | I2C | 0°C | 70°C | - | - | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS12C887+
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73Y1079 |
Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V, EDIP-24 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | Alarm RTC | 4.5V | 5.5V | - | 24Pins | Multiplexed | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1682S+T&R
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73Y1324 |
Elapsed Time Recorder IC, Date Time Format, I2C, 2.5 V to 5.5 V, NSOIC-8 ANALOG DEVICES
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- | - | Elapsed Time Recorder | 2.5V | 5.5V | NSOIC | 8Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS12887+
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78Y4773 |
RTC, Date Time Format (Day/Date/Month/Year 12Hr/24Hr), Multiplexed, 4.5V to 5.5 V, DIP-24 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | RTC | 4.5V | 5.5V | EDIP | 24Pins | Multiplexed | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1244Y-70+
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73Y1160 |
RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Parallel, 4.5 V to 5.5 V, EDIP-28 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS:hh | RTC | 4.5V | 5.5V | - | 28Pins | Parallel | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1372U+
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73Y1249 |
Binary Counter IC, Date Time Format (Binary), I2C, 2.4 V to 5.5 V, µSOP-8 ANALOG DEVICES
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Binary | Binary | - | 2.4V | 5.5V | µSOP | 8Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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MCP7940N-I/SN
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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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PCF2129T/2,518
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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 | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PCF8523T/1,118
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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 | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1243Y-120+
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73Y1159 |
RTC W/ NVSRAM, 64KB, HH:MM:SS:HH, EDIP28 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS:hh | RTC | 4.5V | 5.5V | EDIP | 28Pins | Parallel | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PCF8563T/5,518
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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 | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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M41T0M6F
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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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1+ $4.40 10+ $3.95 100+ $3.24 500+ $2.76 1000+ $2.51 |
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Day; Date; Month; Year; Century | HH:MM:SS | RTC | 2V | 5.5V | SOIC | 8Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1339C-33#
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14AC3758 |
REAL TIME CLOCK, 3.3V, I2C, SOIC-16 ANALOG DEVICES
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DD:MM:YY | HH:MM:SS | RTC | 2.97V | 5.5V | SOIC | 16Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS3231S#T&R
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38AC0955 |
RTC, I2C, SERIAL, 5.5V, SOIC-16 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | RTC | 2.3V | 5.5V | SOIC | 16Pins | I2C | 0°C | 70°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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PCF8563T/F4,118
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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 | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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DS1307ZN+T&R
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38AC0918 |
RTC, Date Time Format (Day/Date/Month/Year HH:MM:SS), I2C, 4.5V to 5.5V Supply, SOIC-8 ANALOG DEVICES
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Day; Date; Month; Year | HH:MM:SS | RTC | 4.5V | 5.5V | SOIC | 8Pins | I2C | -40°C | 85°C | - | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
