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 189-8595
製造零件編號DS1305+
HK$53.50
/個 (每包:2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 686-5036
製造零件編號M48T58-70PC1
HK$159.79
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 191-3664
製造零件編號DS1307ZN+T&R
HK$30.49
/個 (每包:5個)
單位
NV SRAM, Real Time Clock DM:M:DW:Y SS:MM:HH - Serial-I2C Surface Mount SO 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm 4.5 V +85 °C
RS庫存編號 190-4733
製造零件編號DS1339BU+
HK$33.652
毎管:50 個
單位
Real Time Clock D:D: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
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RS庫存編號 205-3454
製造零件編號X1B000242000112
BrandEpson
HK$11.047
個 (在毎卷:250)
單位
Real Time Clock - - 128bit - - SOP-14 14 - - - - - -
RS庫存編號 827-4628
製造零件編號X1B000172000112
BrandEPSON
HK$29.31
單位
Alarm, Calendar, Event Detection and Timestamp, Power Switching, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount SOP 14 10.1 x 5 x 3.15mm 10.1mm 5mm 3.15mm 5.5 V +85 °C
RS庫存編號 786-0749
製造零件編號DS1337+
HK$26.79
/個 (每包:2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 817-3658
製造零件編號MCP79410T-I/SN
BrandMicrochip
HK$6.963
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 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 177-0837
製造零件編號MCP7940N-E/SN
BrandMicrochip
HK$7.056
/個 (每包:10個)
單位
- D:M:Y, DW HH:MM:SS - Serial-I2C Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 4.9mm 3.9mm 1.5mm 5.5 V +125 °C
RS庫存編號 189-8391
製造零件編號DS3231MZ+
HK$67.69
/個 (每包:2個)
單位
Battery Backup, Calendar Binary 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 798-5254
製造零件編號MCP7940N-I/MS
BrandMicrochip
HK$6.87
/個 (每包:10個)
單位
Battery Backup, Calendar 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 540-2710
製造零件編號DS1306+
HK$52.91
單位
Alarm, Battery Backup, 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 667-6252
製造零件編號Q41856471000111
BrandEPSON
HK$32.76
單位
Alarm, Calendar, Timer DW:DM:M:Y HH:MM:SS - Serial-I2C Surface Mount VSOJ 20 - 7mm 5.4mm - 5.5 V +85 °C
RS庫存編號 880-5345
製造零件編號M41T94MH6F
HK$51.645
/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
RS庫存編號 786-0745
製造零件編號DS1307N+
HK$34.23
/個 (每包:2個)
單位
Clock DM:M:DW:Y SS:MM:HH 56B 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 103-9915
製造零件編號DS3231S#
HK$73.913
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 +70 °C
RS庫存編號 169-8135
製造零件編號Q42724231000611
BrandEPSON
HK$62.24
毎管:25 個
單位
Calendar, Timer - - - Serial-I2C Surface Mount SOP 24 16.3 x 7.9 x 2.8mm 16.3mm 7.9mm 2.8mm 5.5 V +85 °C
RS庫存編號 188-9206
製造零件編號M41T82RM6F
HK$11.549
個 (在毎卷:2500)
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 824-6447
製造零件編號MCP7940NT-I/MNY
BrandMicrochip
HK$7.231
/個 (每包:10個)
單位
Calendar, Clock DW:DM:M:Y HH:MM:SS 64B Serial-2 Wire, Serial-I2C Surface Mount TDFN 8 3 x 2 x 0.75mm 3mm 2mm 0.75mm 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