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庫存編號 920-8991
製造零件編號M48T58Y-70PC1
HK$134.43
毎管:12 個
單位
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庫存編號 169-8144
製造零件編號Q41802551000111
BrandEPSON
HK$24.452
個 (在毎卷:250)
單位
Alarm, Calendar, Timer - - - Serial-I2C Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS庫存編號 667-6278
製造零件編號Q41802551000111
BrandEPSON
HK$30.69
單位
Alarm, Calendar, Timer - - - Serial-I2C Surface Mount SOP 14 5 x 10.1 x 3.2mm 5mm 10.1mm 3.2mm 5.5 V +85 °C
RS庫存編號 686-5030
製造零件編號M48T58Y-70PC1
HK$146.15
單位
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庫存編號 169-8222
製造零件編號X1B000311000112
BrandEPSON
HK$39.831
Each (On a Tape of 20)
單位
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庫存編號 667-6212
製造零件編號Q42724211000200
BrandEPSON
HK$70.05
單位
Calendar DW:DM:M:Y HH:MM:SS - Parallel Through Hole PDIP 18 23.1 x 6.3 x 4.2mm 23.1mm 6.3mm 4.2mm 5.5 V +70 °C
RS庫存編號 865-2208
製造零件編號PCF8563T/5,518
BrandNXP
HK$6.885
/個 (每包:10個)
單位
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庫存編號 169-8134
製造零件編號Q42724211000200
BrandEPSON
HK$44.097
毎管:25 個
單位
Calendar DW:DM:M:Y HH:MM:SS - Parallel Through Hole PDIP 18 23.1 x 6.3 x 4.2mm 23.1mm 6.3mm 4.2mm 5.5 V +70 °C
RS庫存編號 169-8137
製造零件編號Q41454351000111
BrandEPSON
HK$27.331
個 (在毎卷:250)
單位
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庫存編號 667-6230
製造零件編號Q41454351000111
BrandEPSON
HK$30.12
單位
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庫存編號 729-3243
製造零件編號RV-2123-C2-TA-010
HK$75.96
單位
Calendar DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS庫存編號 171-1647
製造零件編號RV-2123-C2-TA-010
HK$56.867
Each (On a Tape of 100)
單位
Calendar DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount SON 10 5 x 3.2 x 1.2mm 5mm 3.2mm 1.2mm 5.5 V +85 °C
RS庫存編號 904-7512
製造零件編號X1B000311000112
BrandEPSON
HK$41.26
單位
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庫存編號 124-2362
製造零件編號PCF8563T/5,518
BrandNXP
HK$6.635
個 (在毎卷:2500)
單位
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庫存編號 165-5488
製造零件編號M41T93RMY6F
HK$18.952
個 (在毎卷:1000)
單位
Real Time Clock DW:DM:M:Y HH:MM:SS:hh 32B Serial-4 Wire, Serial-I2C Surface Mount SOX 18 11.66 x 7.67 x 2.39mm 11.66mm 7.67mm 2.39mm 5.5 V +85 °C
RS庫存編號 191-6894
製造零件編號DS1685S-5+
HK$53.325
/個 (每包:2個)
單位
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
RS庫存編號 690-2848
製造零件編號RV-3049-C2-STD-025
HK$53.33
單位
Alarm, Calendar, Timer 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庫存編號 189-8654
製造零件編號DS1340C-33#
HK$52.88
/個 (每包:2個)
單位
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庫存編號 729-3230
製造零件編號RV-8564-C2-TA-010
HK$46.94
單位
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庫存編號 817-3654
製造零件編號MCP79410T-I/MS
BrandMicrochip
HK$7.06
個 (在毎卷:2500)
單位
Alarm, Battery Backup, Calendar, Clock DW:D: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