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 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 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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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. 761-7627
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP7940M-I/SN
Brand :Microchip
THB18.50
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
THB16.514
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. 865-2208
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCF8563T/5,518
Brand :NXP
THB27.422
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. 124-2362
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCF8563T/5,518
Brand :NXP
THB26.424
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. 919-6337
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M48T18-100PC1
THB572.485
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. 904-7512
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X1B000311000112
Brand :EPSON
THB164.35
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. 578-831
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M41T65Q6F
THB60.43
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. 169-8141
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.Q41856471000111
Brand :EPSON
THB118.689
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. 667-6252
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.Q41856471000111
Brand :EPSON
THB130.47
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. 166-0790
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M41T65Q6F
THB29.152
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. 714-7298
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.M48T18-100PC1
THB622.79
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. 169-8222
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X1B000311000112
Brand :EPSON
THB127.383
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. 727-5743
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCA8565TS/1,118
Brand :NXP
THB49.845
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. 166-0314
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PCA8565TS/1,118
Brand :NXP
THB37.617
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. 797-9458
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1338Z-18+
THB117.40
Each: (In a Pack of 2)
Units
Calendar YY:MM:DD HH:MM:SS 56B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 761-3903
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1305EN+T&R
THB170.39
Each
Units
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 96B Serial-3 Wire Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 5.5 V +85 °C
RS Stock No. 761-3896
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1337S+T&R
THB88.118
Each: (In a Pack of 5)
Units
Calendar YY:MM:DD HH:MM:SS - Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 185-0951
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BU9873FVT-GE2
Brand :ROHM
THB12.158
Each (On a Reel of 3000)
Units
Real Time Clock YY:MM:DD:dd HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 4.4 x 3 x 1mm 4.4mm 3mm 1mm 5.5 V +85 °C
RS Stock No. 191-3664
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1307ZN+T&R
THB117.862
Each: (In a Pack of 5)
Units
NV SRAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 4.5 V +85 °C
ใหม่ / New
RS Stock No. 190-5136
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.DS1390U-33+T&R
THB97.968
Each: (In a Pack of 5)
Units
Trickle Charger D:D:M:Y - - Serial-SPI Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 5.5 V +85 °C
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