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. 190-5127
Mfr. Part No.DS1388Z-33+T&R
HK$44.90
Each (In a Pack of 2)
units
Real Time Clock, Trickle Charger D:D:M:Y - - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 3.63 V +85 °C
RS Stock No. 165-5508
Mfr. Part No.M41T94MH6F
HK$27.233
Each (On a Reel of 936)
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. 714-7288
Mfr. Part No.M41T56M6F
HK$22.59
Each (In a Pack of 2)
units
Calendar, Chip Deselect, Switch Over 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. 189-8339
Mfr. Part No.DS1302N+
HK$35.43
Each (In a Pack of 2)
units
Trickle Charger DM:M:DW:Y SS:MM:HH 31B Serial-3 Wire Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C
RS Stock No. 192-1456
Mfr. Part No.DS12C887A+
HK$84.17
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. 920-9010
Mfr. Part No.M41T60Q6F
HK$6.94
Each (On a Reel of 3000)
units
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 8B Serial-I2C Surface Mount QFN 16 3 x 3 x 0.88mm 3mm 3mm 0.88mm 4.4 V +85 °C
RS Stock No. 165-9585
Mfr. Part No.DS1746WP-120+
HK$238.19
Each (In a Tube of 40)
units
Calendar YY:MM:DD HH:MM:SS 128 x 8bit Parallel Surface Mount Power Cap 34 25.27 x 23.62 x 0.81mm 25.27mm 23.62mm 0.81mm 0.6 V, 3.6 V +70 °C
RS Stock No. 732-7383
Mfr. Part No.DS1374U-33+
HK$31.75
Each
units
Battery Backup, NV RAM Binary SS 3B Serial-I2C Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS Stock No. 907-4732
Mfr. Part No.M41ST87WMX6TR
HK$62.89
Each (In a Pack of 2)
units
Calendar, Clock DD:MM:YY HH:MM:SS 128B Serial-I2C Surface Mount SOX 28 18.01 x 7.67 x 2.38mm 18.01mm 7.67mm 2.38mm 3.6 V +85 °C
RS Stock No. 168-8043
Mfr. Part No.M41ST87WSS6F
HK$28.819
Each (On a Reel of 1350)
units
Calendar D:D:M:Y:C HH:MM:SS:HSS 128B Serial Surface Mount SSOP 20 7.5 x 5.6 x 1.85mm 7.5mm 5.6mm 1.85mm 3.6 V +85 °C
RS Stock No. 171-1642
Mfr. Part No.RV-3049-C2-TB-030
HK$49.335
Each (On a Tape of 100)
units
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 8B Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS Stock No. 189-7242
Mfr. Part No.DS1685EN-3+
HK$55.948
Each (In a Tube of 62)
units
Alarm, Calendar YY:MM:DD HH:MM:SS 128B Multiplexed Surface Mount TSSOP 24 7.9 x 4.5 x 0.95mm 7.9mm 4.5mm 0.95mm 5 V +85 °C
RS Stock No. 189-8649
Mfr. Part No.DS1315S-5+
HK$161.15
Each
units
Battery Backup, Calendar YY:MM:DD HH:MM:SS - Parallel Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 190-5166
Mfr. Part No.DS3232SN#T&R
HK$73.46
Each
units
Alarm, SRAM DM:M:DW:Y SS:MM:HH 236B Serial-I2C Surface Mount SO 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
RS Stock No. 191-3287
Mfr. Part No.DS1340C-33#T&R
HK$28.439
Each (On a Reel of 1000)
units
Clock, Real Time Clock, Trickle Charger D:D:M: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
New
RS Stock No. 196-9069
Mfr. Part No.ISL1208IB8Z-TK
HK$11.602
Each (On a Reel of 1000)
units
- DW:DM:M:Y HH:MM:SS - - - SOIC 8 - - - - - -
RS Stock No. 190-7170
Mfr. Part No.DS1904L-F5#
HK$91.49
Each
units
- - - - - - - - - - - - - -
RS Stock No. 165-9240
Mfr. Part No.DS1302SN+
HK$29.01
Each (In a Tube of 88)
units
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 31B Serial Surface Mount SOIC 8 5.46 x 5.41 x 2.03mm 5.46mm 5.41mm 2.03mm 5.5 V +85 °C
RS Stock No. 189-8362
Mfr. Part No.DS3232S#
HK$73.33
Each
units
Battery Backup, Calendar, NV RAM DD:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS Stock No. 169-8140
Mfr. Part No.Q41457451000200
BrandEPSON
HK$24.871
Each (On a Reel of 250)
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