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, an RTC will also include a calendar and an alarm

How 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 facilitates the performance of the software functions that are time dependant.

Designed to run on ultra-low power consumption, RTCs often run on a lithium battery source but can also run on 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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กำลังดูสินค้า 1 - 20 รายการจาก 435 รายการ / Viewing 1 - 20 of 435 products
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รายละเอียดสินค้า / Description ราคา / 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. 865-2208
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCF8563T/5,518
Brand :NXP
THB24.68
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. 761-7627
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP7940M-I/SN
Brand :Microchip
THB21.43
Each: (In a Pack of 5)
Units
Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS Stock No. 912-6943
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP7940M-I/SN
Brand :Microchip
THB20.686
Each (In a Tube of 100)
Units
Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS Stock No. 124-2362
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCF8563T/5,518
Brand :NXP
THB27.624
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. 578-831
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M41T65Q6F
THB56.77
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. 667-6252
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.Q41856471000111
Brand :EPSON
THB111.93
Each
Units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS Stock No. 169-8222
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X1B000311000112
Brand :EPSON
THB133.166
Each (On a Tape of 20)
Units
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 714-7298
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M48T18-100PC1
THB671.58
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. 166-0790
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M41T65Q6F
THB42.039
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. 169-8141
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.Q41856471000111
Brand :EPSON
THB103.548
Each (On a Reel of 250)
Units
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS Stock No. 166-0314
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCA8565TS/1,118
Brand :NXP
THB46.746
Each (On a Reel of 2500)
Units
Alarm, Calendar, Interrupt, 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 +125 °C
RS Stock No. 904-7512
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X1B000311000112
Brand :EPSON
THB151.20
Each
Units
Clock - SS:HH 32bit Serial-I2C Surface Mount - 10 3.2 x 2.5 x 1mm 3.2mm 2.5mm 1mm 5.5 V +85 °C
RS Stock No. 919-6337
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M48T18-100PC1
THB657.419
Each (In a Tube of 12)
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. 727-5743
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCA8565TS/1,118
Brand :NXP
THB47.81
Each: (In a Pack of 2)
Units
Alarm, Calendar, Interrupt, 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 +125 °C
RS Stock No. 912-6738
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP79411-I/SN
Brand :Microchip
THB34.601
Each (In a Tube of 100)
Units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 V +85 °C
RS Stock No. 190-5169
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1682S+T&R
THB158.71
Each
Units
Alarm - - - - Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 667-6243
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.Q41457451000200
Brand :EPSON
THB96.25
Each
Units
Alarm, Calendar, Timer - - - Serial Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS Stock No. 146-0221
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP79521-I/MS
Brand :Microchip
THB45.132
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. 813-5763
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.RV-3029-C3-TA-QC-Opt.B
Brand :Micro Crystal
THB194.20
Each
Units
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
RS Stock No. 714-7285
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M41T11MH6F
THB149.70
Each
Units
Calendar, Chip Deselect, Switch Over DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOH 28 18.49 x 8.89 x 2.69mm 18.49mm 8.89mm 2.69mm 5.5 V +85 °C