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
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RS庫存編號 192-1247
製造零件編號DS1746W-120+
BrandMaxim
HK$310.375
毎管:11 個
單位
Calendar YY:MM:DD HH:MM:SS 128 x 8bit Parallel Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 0.6 V, 3.6 V +70 °C
RS庫存編號 111-3741
製造零件編號MCP7940MT-I/SN
BrandMicrochip
HK$4.275
個 (在毎卷:3300)
單位
Calendar, Clock DM:M:DW:Y HH:MM:SS - 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庫存編號 880-5345
製造零件編號M41T94MH6F
HK$40.427
/個 (每包:6個)
單位
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
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RS庫存編號 188-9354
製造零件編號M41T82RM6F
HK$113.58
單位
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 32bit Serial-2 Wire, Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS庫存編號 761-3903
製造零件編號DS1305EN+T&R
BrandMaxim
HK$40.58
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 823-7954
製造零件編號MCP79511-I/MS
BrandMicrochip
HK$9.858
/個 (每包:5個)
單位
Calendar D:W:M:Y, LY HH, HS, MM, SS 64B Serial-SPI Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
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RS庫存編號 189-7216
製造零件編號DS1315S-5+
BrandMaxim
HK$136.501
毎管:46 個
單位
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
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RS庫存編號 189-7196
製造零件編號DS12C887+
BrandMaxim
HK$83.033
毎管:14 個
單位
Alarm Binary, DW:DM:M:Y Binary, HH:MM:SS 113B Multiplexed Through Hole EDIP 24 34.04 x 18.29 x 9.4mm 34.04mm 18.29mm 9.4mm 5.5 V +70 °C
RS庫存編號 813-5779
製造零件編號RV-3049-C3-TA-QC-Opt.A
HK$42.71
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 190-5835
製造零件編號DS1339C-33#T&R
BrandMaxim
HK$59.565
/個 (每包:2個)
單位
- 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庫存編號 169-8140
製造零件編號Q41457451000200
BrandEPSON
HK$21.726
個 (在毎卷:250)
單位
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
RS庫存編號 923-7469
製造零件編號DS1337S+T&R
BrandMaxim
HK$11.563
個 (在毎卷:2500)
單位
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
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RS庫存編號 189-7204
製造零件編號DS1302ZN+T&R
BrandMaxim
HK$15.969
個 (在毎卷:2500)
單位
Battery Backup, Calendar, NV RAM YY:MM:DD HH:MM:SS 31B Serial-3 Wire Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS庫存編號 923-5797
製造零件編號DS1307ZN+
BrandMaxim
HK$25.24
毎管:100 個
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Calendar DW:DM:M:Y HH:MM:SS 56B 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 100-0649
製造零件編號ISL1208IU8Z-T7A
BrandIntersil
HK$25.65
Each (On a Tape of 2)
單位
Alarm, Calendar, Clock, SRAM DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount MSOP 8 3.05 x 3.05 x 0.95mm 3.05mm 3.05mm 0.95mm 5.5 V +85 °C
RS庫存編號 165-9516
製造零件編號DS1338Z-18+
BrandMaxim
HK$19.01
毎管:100 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
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RS庫存編號 189-8407
製造零件編號DS1337U+
BrandMaxim
HK$26.53
/個 (每包:5個)
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Calendar DW:DM:M:Y HH:MM:SS - 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
RS庫存編號 178-0558
製造零件編號BU9873NUX-TTR
BrandROHM
HK$4.177
/個 (每包:10個)
單位
Real Time Clock - HH:MM:SS - Serial-I2C Surface Mount VSON008X2030 8 2 x 3 x 0.58mm 2mm 3mm 0.85mm 5.5 V +85 °C
RS庫存編號 920-9004
製造零件編號M48T58-70PC1
HK$140.16
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 169-8315
製造零件編號DS1302Z+
BrandMaxim
HK$21.372
毎管:100 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 +70 °C