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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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EM Microelectronic
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15µA @ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | - | 8B | Surface Mount | -40°C ~ 85°C (TA) | 28-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Microchip Technology
|
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1µA @ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM | I²C, 2-Wire Serial | 64B | Through Hole | -40°C ~ 85°C | 8-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Through Hole | -40°C ~ 85°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
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Analog Devices / Maxim Integrated
|
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200µA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
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Analog Devices / Maxim Integrated
|
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Trickle-Charger | SPI | 96B | Through Hole | -40°C ~ 85°C | 16-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 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 | |
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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100µA @ 3.3V | 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 | |
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-SOIC | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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1.1mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | 0°C ~ 70°C | 16-SOIC | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 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 | 8KB | Through Hole | 0°C ~ 70°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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4mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 32KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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6mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 32KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 32KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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6mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 32KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 32KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD-dd | NVSRAM | Parallel | 128KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 3V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 512KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD-dd | NVSRAM | Parallel | 128KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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4mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 512KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 512KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
|
EM Microelectronic
|
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0.8µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | 3-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.2V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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125µA @ 2.7V ~ 3.3V | Binary | Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-uMAX/uSOP | Binary | Binary Counter | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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3mA @ 5V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Through Hole | 0°C ~ 70°C | 24-PDIP | 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 | -40°C ~ 85°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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 | 8KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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Analog Devices / Maxim Integrated
|
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1.3mA @ 5V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | -40°C ~ 85°C | 16-PDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
Epson
|
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3µA @ 3V | YY-MM-DD | Alarm, RAM | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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1.1mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
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 | 8KB | Through Hole | 0°C ~ 70°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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6mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 128KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
|
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4mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 512KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
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 | |
ROHM Semiconductor
|
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1µA ~ 1.35µA @ 3V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
|
ROHM Semiconductor
|
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1µA ~ 1.35µA @ 3V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
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3µA @ 3V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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3µA @ 3V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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0.5µA @ 1.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | 16B | Surface Mount | -40°C ~ 85°C | 6-TDFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Renesas
|
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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-TDFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Renesas
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5µA @ 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 | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
NXP Semiconductors
|
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8µA ~ 15µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, NVSRAM | I²C, 2-Wire Serial | 8B | Surface Mount | -40°C ~ 85°C | 8-SO | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.5V ~ 6V | |
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 | Surface Mount | -40°C ~ 85°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.05V | |
STMicroelectronics
|
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2mA @ 2.7V ~ 3.6V | YY-MM-DD-dd | Leap Year, Supervisor | Serial | - | Surface Mount | -40°C ~ 85°C | 28-SOH | HH:MM:SS (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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1.1mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | -40°C ~ 85°C | 20-TSSOP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
Nisshinbo Micro Devices
|
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1µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-SSOP-G | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 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 | 8KB | Surface Mount | -40°C ~ 85°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Epson
|
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2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | 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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V |
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