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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RS庫存編號 829-0355
製造零件編號M41T81SM6F
HK$19.06
/個 (每包:5個)
單位
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庫存編號 169-8278
製造零件編號CDP68HC68T1EZ
BrandIntersil
HK$84.55
毎管:25 個
單位
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Through Hole PDIP 16 19.68 x 7.11 x 4.95mm 19.68mm 7.11mm 4.95mm 6 V +85 °C
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RS庫存編號 189-8484
製造零件編號DS1302ZN+
BrandMaxim
HK$38.26
/個 (每包:2個)
單位
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 +85 °C
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RS庫存編號 189-7251
製造零件編號DS3231SN#
BrandMaxim
HK$81.853
毎管:46 個
單位
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
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RS庫存編號 189-8336
製造零件編號DS1337C#
BrandMaxim
HK$51.72
/個 (每包:2個)
單位
Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOIC 16 10.5 x 7.6 x 2.35mm 10.5mm 7.6mm 2.35mm 5.5 V +85 °C
RS庫存編號 803-2204
製造零件編號MCP795W22-I/SL
BrandMicrochip
HK$14.012
/個 (每包:5個)
單位
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount SOIC 14 8.65 x 3.9 x 1.25mm 8.65mm 3.9mm 1.25mm 3.6 V +85 °C
RS庫存編號 813-5781
製造零件編號RV-3049-C3-TB-QA-Opt.A
HK$59.29
單位
Alarm, Battery Backup, Calendar, Clock D:W:M:Y HH:MM:SS 8B Serial-4 Wire, Serial-SPI Surface Mount SON 10 3.7 x 2.5 x 0.9mm 3.7mm 2.5mm 0.9mm 5.5 V +85 °C
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RS庫存編號 189-8457
製造零件編號DS1307+
BrandMaxim
HK$35.606
/個 (每包:5個)
單位
Alarm, Battery Backup, Calendar, Power Fail DW:DM:M:Y HH:MM:SS 56B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
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RS庫存編號 192-1541
製造零件編號DS1338Z-18+
BrandMaxim
HK$38.26
/個 (每包:2個)
單位
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庫存編號 797-9607
製造零件編號DS17887-5+
BrandMaxim
HK$171.99
單位
Alarm, Calendar YY:MM:DD HH:MM:SS 114B Multiplexed Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 38.1mm 18.29mm 10.67mm 5.5 V +70 °C
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RS庫存編號 189-8329
製造零件編號DS1391U-33+
BrandMaxim
HK$33.70
/個 (每包:5個)
單位
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount μSOP 10 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
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RS庫存編號 189-7197
製造零件編號DS1302+
BrandMaxim
HK$25.786
毎管:50 個
單位
Alarm, Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 31B Serial Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +70 °C
RS庫存編號 145-9048
製造零件編號MCP7940N-I/ST
BrandMicrochip
HK$6.69
毎管:100 個
單位
Calendar DW:D:M:Y HH:MM:SS 64B Serial-I2C Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm 5.5 V +85 °C
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RS庫存編號 189-7208
製造零件編號DS1305EN+T&R
BrandMaxim
HK$24.367
個 (在毎卷:2500)
單位
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庫存編號 642-3106
製造零件編號CDP68HC68T1MZ
HK$71.26
單位
Alarm, Battery Backup, Calendar, Watchdog Timer DW:DM:M:Y HH:MM:SS 32B Serial-SPI Surface Mount SOIC W 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 6 V +85 °C
全新
RS庫存編號 190-5159
製造零件編號DS1672U-33+
BrandMaxim
HK$28.848
/個 (每包:5個)
單位
- - - - 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庫存編號 146-0203
製造零件編號MCP7940M-I/P
BrandMicrochip
HK$5.11
毎管:60 個
單位
Alarm, Calendar DW:DM:M:Y HH:MM:SS 64B Serial-I2C Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 10.16mm 7.11mm 4.95mm 5.5 V +85 °C
RS庫存編號 578-831
製造零件編號M41T65Q6F
HK$12.24
/個 (每包:5個)
單位
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
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RS庫存編號 189-8536
製造零件編號DS1374U-33+
BrandMaxim
HK$34.182
/個 (每包:5個)
單位
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庫存編號 732-7359
製造零件編號DS1338U-33+
BrandMaxim
HK$31.68
單位
Battery Backup, Calendar, NV RAM DW:DM:M:Y HH:MM:SS 56B Serial-I2C Surface Mount μSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C