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 798-5267
製造零件編號MCP79411-I/SN
BrandMicrochip
HK$8.39
/個 (每包:10個)
單位
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B 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 191-4204
製造零件編號DS1251Y-70+
HK$282.478
毎管:10 個
單位
NV SRAM, Real Time Clock D:DM:M:Y - - - Surface Mount EDIP 32 1.74 x 0.74 x 0.43mm 1.74mm 0.74mm 0.43mm - +70 °C
RS庫存編號 191-5233
製造零件編號DS1050Z-001+
HK$15.759
毎管:100 個
單位
Clock DM:M:DM:Y SS:MM:HH - - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 5.5 V +85 °C
RS庫存編號 190-4743
製造零件編號DS1670E+
HK$72.883
毎管:74 個
單位
Real Time Clock, SRAM DM:M:DW:Y SS:MM:HH - Multiplexed Surface Mount TSSOP 20 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 3.63 V +70 °C
RS庫存編號 169-8293
製造零件編號ISL12026IBZ
BrandIntersil
HK$24.30
毎管:98 個
單位
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 512B 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 189-8359
製造零件編號DS1672S-33+
HK$25.526
/個 (每包:5個)
單位
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - 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 190-4738
製造零件編號DS1347T+T&R
HK$14.404
個 (在毎卷:2500)
單位
Alarm, Real Time Clock, SRAM DM:M:Y:C SS:MM:HH - - Surface Mount TDFN-EP 8 3.1 x 3.1 x 0.8mm 3.1mm 3.1mm 0.8mm 5.5 V +85 °C
RS庫存編號 189-8698
製造零件編號DS1337+
HK$26.79
/個 (每包:5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 912-6738
製造零件編號MCP79411-I/SN
BrandMicrochip
HK$7.38
毎管:100 個
單位
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS 64B 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 192-1620
製造零件編號DS1511W+
HK$152.83
單位
Alarm, Watchdog Timer YY:MM:DD HH:MM:SS 256B Parallel Through Hole EDIP 28 37.34 x 14.61 x 4.45mm 37.34mm 14.61mm 4.45mm 5.5 V +70 °C
RS庫存編號 188-9342
製造零件編號M41T80M6F
HK$19.03
單位
Alarm, Calendar Binary, D:D:M:Y:C - - 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 189-7205
製造零件編號DS1305+
HK$48.734
毎管:25 個
單位
Alarm, Calendar DW:DM:M:Y HH:MM:SS 96B Serial-SPI Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm 5.5 V +70 °C
RS庫存編號 732-7374
製造零件編號DS1340U-33+
HK$31.83
單位
Battery Backup, Calendar DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount μSOP 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 165-2097
製造零件編號MCP79511-I/MS
BrandMicrochip
HK$9.249
毎管:100 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
RS庫存編號 714-7298
製造零件編號M48T18-100PC1
HK$157.67
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 190-7170
製造零件編號DS1904L-F5#
HK$91.49
單位
- - - - - - - - - - - - - -
RS庫存編號 189-7253
製造零件編號DS3232S#
HK$58.283
毎管:36 個
單位
Battery Backup, Calendar, NV RAM DD:M:Y HH:MM:SS 236B Serial-I2C Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +70 °C
RS庫存編號 177-9886
製造零件編號BU9873NUX-TTR
BrandROHM
HK$3.154
個 (在毎卷:4000)
單位
Real Time Clock YY:MM:DD:DW 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 188-9366
製造零件編號M41ST85WMX6TR
HK$57.64
單位
Alarm, Battery Backup, Calendar, Watchdog Timer Binary, D:D:M:Y:C - 64bit - Surface Mount SOX 28 18.01 x 7.67 x 2.39mm 18.01mm 7.67mm 2.39mm 3.6 V +85 °C
RS庫存編號 177-0656
製造零件編號MCP79400-I/MS
BrandMicrochip
HK$7.46
/個 (每包:10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