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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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. 518-299
Mfr. Part No.ISL12026IBZ
BrandIntersil
HK$31.06
Each
units
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 512B Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS Stock No. 169-8315
Mfr. Part No.DS1302Z+
HK$26.669
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
New
RS Stock No. 205-3460
Mfr. Part No.X1B000371000212
BrandEpson
HK$18.304
Each (On a Reel of 250)
units
Real Time Clock - - - - - 3.2x2.5 ceramic package 10 - - - - - -
RS Stock No. 817-3658
Mfr. Part No.MCP79410T-I/SN
BrandMicrochip
HK$6.963
Each (On a Reel of 3300)
units
Alarm, Battery Backup, Calendar, Clock DW:D: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 5.5 V +85 °C
RS Stock No. 729-3375
Mfr. Part No.RV-8564-C2-TA-020
HK$34.13
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. 191-3232
Mfr. Part No.DS1307ZN+T&R
HK$17.348
Each (On a Reel of 2500)
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
RS Stock No. 662-4722
Mfr. Part No.BQ4802LYPW
HK$62.93
Each
units
Alarm, Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 16B Parallel Surface Mount TSSOP 28 9.7 x 4.4 x 1.15mm 9.7mm 4.4mm 1.15mm 3.6 V +70 °C
RS Stock No. 825-1164
Mfr. Part No.MCP79411-I/MS
BrandMicrochip
HK$8.992
Each (In a Pack of 10)
units
Calendar DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS Stock No. 190-4734
Mfr. Part No.DS1339C-33#T&R
HK$31.566
Each (On a Reel of 1000)
units
Alarm, Clock, Real Time Clock, Square Wave Output, Trickle Charger DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount SO 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 122-3408
Mfr. Part No.DS1340U-33+
HK$28.18
Each (In a Tube of 25)
units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount μSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS Stock No. 177-0308
Mfr. Part No.MCP795W10-I/SL
BrandMicrochip
HK$14.297
Each (In a Tube of 57)
units
- D:M:Y, DW HH:MM:SS - Serial-SPI Surface Mount SOIC 14 8.65 x 3.9 x 1.5mm 8.65mm 3.9mm 1.5mm 3.6 V +85 °C
RS Stock No. 920-9133
Mfr. Part No.M41T81SM6F
HK$11.857
Each (On a Reel of 2500)
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. 191-5742
Mfr. Part No.DS1687-3+
HK$116.34
Each
units
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount EDIP 24 1.34 x 0.72 x 0.37mm 1.34mm 0.72mm 0.37mm 5.5 V +70 °C
RS Stock No. 190-5146
Mfr. Part No.DS1305E+T&R
HK$43.415
Each (In a Pack of 2)
units
Alarm, Real Time Clock, Trickle Charger DM:M:DW:Y SS:MM:HH 96B Serial-SPI Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 5.5 V +70 °C
RS Stock No. 190-4730
Mfr. Part No.DS1315-5+
HK$127.606
Each (In a Tube of 25)
units
Real Time Clock, SRAM D:DM:M:Y - - - Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
RS Stock No. 191-6894
Mfr. Part No.DS1685S-5+
HK$53.325
Each (In a Pack of 2)
units
NV SRAM, Real Time Clock - - 242B Multiplexed Surface Mount SO 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +70 °C
New
RS Stock No. 204-2516
Mfr. Part No.MAX31343EKA+
HK$29.218
Each (In a Pack of 5)
units
Real Time Clock - HH:MM:SS 64B - - WLP 8 - - - - - -
RS Stock No. 191-3234
Mfr. Part No.DS1337U+T&R
HK$12.829
Each (On a Reel of 3000)
units
Real Time Clock D:D:M:Y SS:MM:HH - Serial-I2C Surface Mount μSOP 8 3.1 x 0.65 x 0.95mm 3.1mm 0.65mm 0.95mm 5.5 V +85 °C
RS Stock No. 190-6090
Mfr. Part No.DS1904L-F5#
HK$77.443
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 177-0876
Mfr. Part No.MCP79412-I/MS
BrandMicrochip
HK$8.992
Each (In a Pack of 10)
units
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
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