Real Time Clocks

What is a Real Time Clock?A Real Time Clock (RTC) is a computer clock which is usually in the form of an integrated circuit. They have been designed to keep track of time, in real time - hence the product name. A Real Time Clock is usually an integral part of the computer motherboard. More often than not, a RTC will also include a calendar and an alarmHow do Real Time Clocks work?The memory on the clocks system stores system descriptions and set up values such as "Current Time Value". The information that is held in the RTC is read with a microprocessor, commonly over a serial interface which facilitate the performance of the software functions that are time dependant. They are designed to run on an ultra-low power consumption, often run on a lithium battery source or normal power. This power source allows them to continue running and generating real time when a system is down. The newer models of RTC use super-capacitors as a source of power that can be recharged and soldered to the board.Some Real Time Clocks feature synchronisation to an external signal, such as a compensated power line frequency. It allows the device to provide an accurate result without having an on-board temperature compensation scheme. RTC Time Values Year Month Date Hours Minutes Seconds

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Description Price Functions Date Format Time Format User RAM Bus Type Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature
RS Stock No. 136-0682
Mfr. Part No.DS12887A+
kr 79,803
Each (In a Tube of 14)
Units
- - - - - - - - - - - - - -
RS Stock No. 124-2362
Mfr. Part No.PCF8563T/5,518
BrandNXP
kr 6,56
Each (On a Reel of 2500)
Units
Calendar, Clock YY:MM:DD:dd HH:MM:SS - Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.45mm 5mm 4mm 1.45mm 5.5 V +85 °C
RS Stock No. 171-1643
Mfr. Part No.RV-8564-C2-TA-010
kr 43,89
Each (On a Tape of 100)
Units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS Stock No. 171-1645
Mfr. Part No.RV-8564-C3-TA-020
kr 33,834
Each (On a Tape of 100)
Units
Alarm, Interrupt, Timer - - - Serial-I2C Surface Mount SON 10 - 3.7mm 3.7mm 2.5mm 5.5 V +85 °C
RS Stock No. 171-1646
Mfr. Part No.RV-4162-C7-TA-020
kr 33,699
Each (On a Tape of 100)
Units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SMD 8 3.2 x 1.5 x 0.8mm 3.2mm 1.5mm 0.8mm 4.4 V +85 °C
RS Stock No. 729-3230
Mfr. Part No.RV-8564-C2-TA-010
kr 52,74
Each
Units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS Stock No. 165-2097
Mfr. Part No.MCP79511-I/MS
BrandMicrochip
kr 9,773
Each (In a Tube of 100)
Units
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 168-8017
Mfr. Part No.M48T12-70PC1
kr 136,119
Each (In a Tube of 14)
Units
Timekeeper SRAM D:M:Y HH:MM:SS 16kbit - Through Hole PCDIP 24 34.8 x 18.34 x 8.89mm 34.8mm 18.34mm 8.89mm 5.5 V +70 °C
RS Stock No. 729-3234
Mfr. Part No.RV-8564-C3-TA-020
kr 40,68
Each
Units
Alarm, Interrupt, Timer - - - Serial-I2C Surface Mount SON 10 - 3.7mm 3.7mm 2.5mm 5.5 V +85 °C
RS Stock No. 823-7954
Mfr. Part No.MCP79511-I/MS
BrandMicrochip
kr 10,748
Each (In a Pack of 5)
Units
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS Stock No. 729-3237
Mfr. Part No.RV-4162-C7-TA-020
kr 36,09
Each
Units
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SMD 8 3.2 x 1.5 x 0.8mm 3.2mm 1.5mm 0.8mm 4.4 V +85 °C
RS Stock No. 865-2208
Mfr. Part No.PCF8563T/5,518
BrandNXP
kr 6,809
Each (In a Pack of 10)
Units
Calendar, Clock YY:MM:DD:dd HH:MM:SS - Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.45mm 5mm 4mm 1.45mm 5.5 V +85 °C
RS Stock No. 920-9001
Mfr. Part No.M48T35Y-70PC1
kr 211,988
Each (In a Tube of 12)
Units
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS Stock No. 774-7403
Mfr. Part No.MCP7940M-I/P
BrandMicrochip
kr 5,723
Each (In a Bag of 10)
Units
Alarm, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS Stock No. 166-1602
Mfr. Part No.PCF8563TS/4,118
BrandNXP
kr 13,608
Each (On a Reel of 2500)
Units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 146-0203
Mfr. Part No.MCP7940M-I/P
BrandMicrochip
kr 5,286
Each (In a Tube of 60)
Units
Alarm, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS Stock No. 511-103
Mfr. Part No.PCF8563TS/4,118
BrandNXP
kr 14,836
Each (In a Pack of 5)
Units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 624-8466
Mfr. Part No.M48T35Y-70PC1
kr 224,13
Each
Units
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 32768B Parallel Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 39.88mm 18.34mm 8.89mm 5.5 V +70 °C
RS Stock No. 828-9977
Mfr. Part No.M48T12-70PC1
kr 143,97
Each
Units
Timekeeper SRAM D:M:Y HH:MM:SS 16kbit - Through Hole PCDIP 24 34.8 x 18.34 x 8.89mm 34.8mm 18.34mm 8.89mm 5.5 V +70 °C
RS Stock No. 729-3224
Mfr. Part No.RV-3029-C2-TB-030
kr 65,30
Each
Units
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 8B Serial-I2C Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
Related Products
A range of real-time clock products from Maxim ...
Description:
A range of real-time clock products from Maxim incorporating non-volatile RAM memory for data retention. The clock/calendar functions provide seconds, minutes, hours, day, date, month, and year information. The clocks generally operate in either the 12 or 24-hour format with ...
A range of real-time clock products from Maxim ...
Description:
A range of real-time clock products from Maxim incorporating non-volatile RAM memory for data retention. The clock/calendar functions provide seconds, minutes, hours, day, date, month, and year information. The clocks generally operate in either the 12 or 24-hour format with ...
A range of real-time clock products from Maxim ...
Description:
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Compatible with Crystal ESR Up to 100kΩ Allows ...
Description:
Compatible with Crystal ESR Up to 100kΩ Allows a Crystal to be Optimized for Cost and Space. Low-Power Operation Extends Battery Backup Run Time. Low Timekeeping Current of 250nA (typ)Automatic Power-Fail Detect and Switch Circuitry. Completely Manages All Timekeeping Functions. ...