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. 624-8438
Mfr. Part No.M41T62Q6F
R 28.388
Each (In a Pack of 5)
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS stock no. 880-5345
Mfr. Part No.M41T94MH6F
R 84.717
Each (In a Pack of 6)
units
Alarm, Battery Backup, Interrupt, NVRAM, Real Time Clock, Watchdog Timer Binary, D:D:M:Y:C Binary, HH:MM:SS 44B Serial-SPI Surface Mount SOH 28 18.49 x 8.89 x 2.69mm 18.49mm 8.89mm 2.69mm 5.5 V +85 °C
RS stock no. 809-1420
Mfr. Part No.M41T81M6F
R 38.848
Each (In a Pack of 5)
units
Alarm Binary HH:MM:SS:hh 20B Serial Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS stock no. 786-0755
Mfr. Part No.DS1340C-33#
R 87.23
Each
units
Trickle Charger DD:M:Y SS:MM:HH 7B Serial-I2C Surface Mount SOIC 16 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °C
RS stock no. 169-8315
Mfr. Part No.DS1302Z+
R 59.174
Each (In a Tube of 100)
units
Calendar, NV RAM, Trickle Charger DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS stock no. 797-9423
Mfr. Part No.DS12C887A+
R 138.40
Each
units
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 38.1mm 18.29mm 10.67mm 5.5 V +85 °C
RS stock no. 923-7494
Mfr. Part No.DS1302Z+T&R
R 21.695
Each (On a Reel of 2500)
units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS stock no. 923-7753
Mfr. Part No.DS12C887A+
R 124.781
Each (In a Tube of 14)
units
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 38.1mm 18.29mm 10.67mm 5.5 V +85 °C
RS stock no. 920-9007
Mfr. Part No.M41T62Q6F
R 14.27
Each (On a Reel of 3000)
units
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS:hh 16B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS stock no. 761-9771
Mfr. Part No.DS1302Z+T&R
R 23.05
Each
units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS stock no. 540-4750
Mfr. Part No.DS1302Z+
R 54.73
Each
units
Calendar, NV RAM, Trickle Charger DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +70 °C
RS stock no. 165-2002
Mfr. Part No.MCP79400-I/SN
BrandMicrochip
R 11.176
Each (In a Tube of 100)
units
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 2.5 V +85 °C
RS stock no. 165-9386
Mfr. Part No.DS1340C-33#
R 76.23
Each (In a Tube of 46)
units
Trickle Charger DD:M:Y SS:MM:HH 7B Serial-I2C Surface Mount SOIC 16 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm 5.5 V +85 °C
RS stock no. 146-0221
Mfr. Part No.MCP79521-I/MS
BrandMicrochip
R 17.438
Each (In a Tube of 100)
units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS stock no. 727-5731
Mfr. Part No.PCF2123TS/1,112
BrandNXP
R 17.88
Each (In a Pack of 2)
units
Alarm, Calendar, Interrupt, Timer DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount TSSOP 14 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm 5.5 V +85 °C
RS stock no. 103-9921
Mfr. Part No.DS3234SN#
R 113.703
Each (In a Tube of 36)
units
Battery Backup, Calendar, SRAM DW:DM:M:Y HH:MM:SS 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
RS stock no. 686-5036
Mfr. Part No.M48T58-70PC1
R 307.67
Each
units
Battery Backup, Calendar, Chip Deselect, Switch Over, Write Protection DW:DM:M:Y HH:MM:SS 8192B 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. 159-7452
Mfr. Part No.MCP79520-I/MS
BrandMicrochip
R 16.265
Each (In a Tube of 100)
units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS stock no. 829-0355
Mfr. Part No.M41T81SM6F
R 38.834
Each (In a Pack of 5)
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 20B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS stock no. 825-1076
Mfr. Part No.MCP79510-I/MS
BrandMicrochip
R 17.914
Each (In a Pack of 5)
units
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C