What are Real Time Clocks ?
Real Time Clocks (RTCs) are integrated circuits designed to keep track of the current time and date, even when the main power is off. They are widely used in applications such as timers, clocks, and scheduling devices in consumer electronics and industrial systems. Important specifications for selecting RTCs include Current, which affects power consumption; Date Format, which determines how the time is displayed; and Operating Temperature, which ensures reliable performance in different environments. Procurement teams should validate lifecycle status and consider alternate-source options to mitigate sourcing risks.
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| Part & Mfr | Current | Date Format | Features | Interface | Memory Size | Mounting Type | Operating Temperature | Supplier Device Package | Time Format | Type | Voltage | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices / Maxim Integrated
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3mA @ 5V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | 0°C ~ 70°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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Epson
|
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2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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300µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Epson
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2.1µA ~ 3.4µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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15mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | -40°C ~ 85°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Epson
|
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2.5µA @ 3V | - | Alarm, Leap Year | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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100µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Epson
|
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2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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175µA @ 2.97V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-uMAX | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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100µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
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Analog Devices / Maxim Integrated
|
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0.5µA ~ 0.7µA @ 1.6V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, RAM, Square Wave Output, Trickle Charger | I²C | 64B | Surface Mount | -40°C ~ 85°C | 10-LGA (5x5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 2.7V ~ 3.7V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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300µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-SOIC | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Epson
|
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0.55µA ~ 0.6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | I²C, 2-Wire Serial | 16B | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
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Epson
|
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2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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15mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Through Hole | 0°C ~ 70°C | 24-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Epson
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1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | Parallel | 114B | Through Hole | -40°C ~ 85°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.05V | |
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Analog Devices / Maxim Integrated
|
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200µA @ 5.5V | YY-MM-DD | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 8-µMAX | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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100µA @ 1.71V ~ 1.89V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-uMAX | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Epson
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2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | - | Time Event Recorder | 1V ~ 5.5V | |
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Intersil
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- | - | - | - | - | - | - | - | - | - | - | |
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STMicroelectronics
|
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3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | Parallel | - | Surface Mount | 0°C ~ 70°C | 44-SOH | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
NXP Semiconductors
|
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- | - | - | - | - | - | - | - | - | - | - | |
Analog Devices / Maxim Integrated
|
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175µA @ 2.97V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-uMAX | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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125µA @ 2.7V ~ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-uMAX | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Texas Instruments
|
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1.5mA (Typ) @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Parallel | - | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Analog Devices / Maxim Integrated
|
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | SPI | 96B | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
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Analog Devices / Maxim Integrated
|
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150µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Micro Crystal AG
|
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210nA @ 3V | YY-MM-DD-dd | Alarm, Battery Switch, Clock Output Hz-MHz, Event Input, Temperature Alarm, Timer, Trickle Charge with Charge Pump | I²C, 2-Wire Serial | 16B, 32B | Surface Mount | -40°C ~ 105°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS:100th (24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Micro Crystal AG
|
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0.24µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, RAM, Timer | SPI, 3-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 0.9V ~ 5.5V | |
Micro Crystal AG
|
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0.24µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, RAM, Timer | I²C, 2-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 0.9V ~ 5.5V | |
Elantec Semiconductor Inc
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0.65µA @ 1.8V | YY-MM-DD-dd | Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Intersil
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0.65µA @ 1.8V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-µTDFN (2x2) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Elantec Semiconductor Inc
|
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0.65µA @ 1.8V | YY-MM-DD-dd | Alarm, Leap Year | I²C | - | Surface Mount | -40°C ~ 85°C | 8-µTDFN (2x2) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Intersil
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0.65µA @ 1.8V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-µTDFN (2x2) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Intersil
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18µA @ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, SRAM | I²C, 2-Wire Serial | 128B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.7V ~ 5.5V | |
Epson
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0.7µA ~ 0.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Y2K | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON | HH:MM:SS | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
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4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | I²C, 2-Wire Serial | 2B | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 3.6V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID | SPI | 64B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
Analog Devices / Maxim Integrated
|
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125µA ~ 200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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270µA @ 4.5V ~ 5.5V | YY-MM-DD-dd | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | 512B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Epson
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 10-SMD | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 3.6V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID | SPI | 64B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
Texas Instruments
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1.5mA (Typ) @ 2.7 V ~ 3.6 V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Parallel | - | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Dallas Semiconductor
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0.45µA @ 2.5V ~ 5.5V | Binary | Unique ID | 1-Wire® Serial | - | Surface Mount | -40°C ~ 85°C | 6-FlipChip (1.09x1.37) | Binary | Binary Counter | 2.5V ~ 5.5V | |
Intersil
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5.5µA ~ 6.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, SRAM | I²C, 2-Wire Serial | 128B | Surface Mount | -20°C ~ 70°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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Epson
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1.5µA @ 3V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 105°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Microchip Technology
|
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1.2µA (Typ) @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V |
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