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 alarmHow 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 817-3651
製造零件編號MCP79410T-I/MNY
BrandMicrochip
HK$7.38
個 (在毎卷:3300)
單位
Alarm, Battery Backup, Calendar, Clock DW:D:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 2 x 3 x 0.75mm 2mm 3mm 0.75mm 5.5 V +85 °C
RS庫存編號 923-7753
製造零件編號DS12C887A+
HK$75.95
毎管:14 個
單位
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
全新
RS庫存編號 190-4748
製造零件編號DS1744-70IND+
HK$340.283
毎管:12 個
單位
NV SRAM, Real Time Clock Y:M:D:D HH:MM:SS - - Through Hole EDIP 28 39.37 x 18.80 x 10.67mm 39.37mm 18.8mm 10.67mm 5 V +85 °C
RS庫存編號 920-9007
製造零件編號M41T62Q6F
HK$7.828
個 (在毎卷:3000)
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
全新
RS庫存編號 190-5173
製造零件編號DS1374U-18+
HK$35.052
/個 (每包:5個)
單位
Binary Counter, Real Time Clock, Trickle Charger - - - Serial-I2C Surface Mount μSOP 10 3.16 x 3.12 x 0.95mm 3.16mm 3.12mm 0.95mm 1.89 V +85 °C
全新
RS庫存編號 196-9063
製造零件編號ISL12020MIRZ
HK$58.85
/個 (每包:2個)
單位
- DW:DM:M:Y HH:MM:SS 128B - - DFN 20 - - - - - -
RS庫存編號 169-8214
製造零件編號X1B000142000212
BrandEPSON
HK$20.848
個 (在毎卷:250)
單位
Alarm, Calendar, EVIN Input, Timer DW:D HH:MM - Serial-I2C Surface Mount - - - - - - 5.5 V +85 °C
RS庫存編號 829-0355
製造零件編號M41T81SM6F
HK$21.82
/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 165-9378
製造零件編號DS1248Y-70+
HK$275.54
毎管:10 個
單位
SRAM with Phantom Clock YY:MM:DD HH:MM:SS:hh 128 x 8bit Serial Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 5 V +70 °C
RS庫存編號 920-9010
製造零件編號M41T60Q6F
HK$6.94
個 (在毎卷:3000)
單位
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庫存編號 189-7206
製造零件編號DS1305E+
HK$39.96
毎管:74 個
單位
Alarm, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Surface Mount TSSOP 20 6.5 x 4.4 x 0.9mm 6.5mm 4.4mm 0.9mm 5.5 V +70 °C
RS庫存編號 727-5743
製造零件編號PCA8565TS/1,118
BrandNXP
HK$13.78
/個 (每包:2個)
單位
Alarm, Calendar, Interrupt, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +125 °C
RS庫存編號 797-9600
製造零件編號DS1747-70+
HK$341.27
單位
Calendar YY:MM:DD HH:MM:SS 512 x 8bit Parallel Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 44.2mm 18.8mm 10.92mm 0.8 V, 5.3 V +70 °C
RS庫存編號 189-7217
製造零件編號DS1337+
HK$21.99
毎管:50 個
單位
Clock DD:M:Y SS:MM:HH 7B Serial-I2C Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 5.5 V +85 °C
RS庫存編號 146-1038
製造零件編號DS1391U-33+
HK$26.36
毎管:50 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
RS庫存編號 171-1642
製造零件編號RV-3049-C2-TB-030
HK$49.335
Each (On a Tape of 100)
單位
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庫存編號 797-9427
製造零件編號DS12R885S-33+
HK$35.19
單位
Alarm, Leap Year, NV SRAM, Square Wave Output, Trickle Charger YY:MM:DD HH:MM:SS 114B Multiplexed Surface Mount SOIC 24 15.6 x 7.6 x 2.35mm 15.6mm 7.6mm 2.35mm 5.5 V +85 °C
RS庫存編號 177-0302
製造零件編號MCP79400-I/MS
BrandMicrochip
HK$7.121
毎管:100 個
單位
- 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
全新
RS庫存編號 190-5146
製造零件編號DS1305E+T&R
HK$48.58
/個 (每包:2個)
單位
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庫存編號 169-8218
製造零件編號X1B000202000312
BrandEPSON
HK$34.674
個 (在毎卷:250)
單位
Alarm, Calendar, Event Detection and Timestamp, Power Switching, Timer DW:DM:M:Y HH:MM:SS - Serial-SPI Surface Mount VSOJ 12 3.6 x 2.4 x 1.2mm 3.6mm 2.4mm 1.2mm 5.5 V +85 °C