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, an 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 facilitates the performance of the software functions that are time dependant.

Designed to run on ultra-low power consumption, RTCs often run on a lithium battery source but can also run on 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 714-7298
製造零件編號M48T18-100PC1
TWD986.00
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 919-6337
製造零件編號M48T18-100PC1
TWD909.80
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 168-6813
製造零件編號M41T00SM6F
TWD57.20
個 (在毎卷:2500)
單位
- DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS庫存編號 714-0855
製造零件編號M41T00SM6F
TWD112.00
單位
- DW:DM:M:Y HH:MM:SS 8B Serial-2 Wire, Serial-I2C Surface Mount SOIC 8 5 x 4 x 1.25mm 5mm 4mm 1.25mm 5.5 V +85 °C
RS庫存編號 159-7452
製造零件編號MCP79520-I/MS
BrandMicrochip
TWD49.10
毎管:100 個
單位
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS庫存編號 923-1499
製造零件編號ISL12020MIRZ
TWD219.50
毎管:53 個
單位
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS庫存編號 169-8223
製造零件編號X1B000301000212
BrandEPSON
TWD245.20
個 (在毎卷:250)
單位
Clock - SS:MM - 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 803-2222
製造零件編號MCP79520-I/MS
BrandMicrochip
TWD47.20
/個 (每包:5個)
單位
Calendar DW:M:Y:LY HH:MM:SS:HSS 64B Serial Surface Mount MSOP 10 3 x 3 x 0.95mm 3mm 3mm 0.95mm 3.6 V +85 °C
RS庫存編號 921-5721
製造零件編號ISL12020MIRZ
TWD255.00
/個 (每包:2個)
單位
Alarm, Battery Backup, Calendar, Switch Over DW:DM:M:Y HH:MM:SS 128B Serial-I2C Surface Mount DFN 20 5.5 x 4 x 1.3mm 5.5mm 4mm 1.3mm 5.5 V +85 °C
RS庫存編號 904-7519
製造零件編號X1B000301000212
BrandEPSON
TWD245.00
單位
Clock - SS:MM - 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 723-4749
製造零件編號MCP79410-I/MS
BrandMicrochip
TWD43.50
/個 (每包:2個)
單位
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount MSOP 8 3 x 3 x 0.95mm 3mm 3mm 0.95mm 5.5 V +85 °C
RS庫存編號 825-1076
製造零件編號MCP79510-I/MS
BrandMicrochip
TWD43.60
/個 (每包:5個)
單位
Calendar DW:M:Y:LY HH:MM:SS:HSS 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 889-5121
製造零件編號MCP79410-I/SN
BrandMicrochip
TWD35.10
毎管:100 個
單位
Battery Backup, Calendar, Clock, NV Timekeeping SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS庫存編號 726-3949
製造零件編號MCP79410-I/SN
BrandMicrochip
TWD35.00
/個 (每包:5個)
單位
Battery Backup, Calendar, NV SRAM DW:DM:M:Y HH:MM:SS 64B Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 5.5 V +85 °C
RS庫存編號 165-2099
製造零件編號MCP79510-I/MS
BrandMicrochip
TWD45.60
毎管:100 個
單位
Calendar DW:M:Y:LY HH:MM:SS:HSS 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 729-3234
製造零件編號RV-8564-C3-TA-020
TWD159.00
單位
Alarm, Interrupt, Timer - - - Serial-I2C Surface Mount SON 10 - 3.7mm 3.7mm 2.5mm 5.5 V +85 °C
RS庫存編號 171-1639
製造零件編號RV-3029-C2-TA-006
TWD318.50
Each (On a Tape of 100)
單位
Battery Backup, Calendar, RAM DW:DM:M:Y HH:MM:SS 8B 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 518-299
製造零件編號ISL12026IBZ
BrandIntersil
TWD135.00
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 189-8376
製造零件編號DS3234SN#
TWD380.00
單位
Battery Backup, Calendar, SRAM DW:DM:M:Y HH:MM:SS 256B Serial-SPI Surface Mount SOIC 20 13 x 7.6 x 2.35mm 13mm 7.6mm 2.35mm 5.5 V +85 °C
RS庫存編號 146-0213
製造零件編號MCP79412-I/SN
BrandMicrochip
TWD34.20
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