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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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Nisshinbo Micro Devices
|
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- | - | - | - | - | - | - | - | - | - | - | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Supervisor, Watchdog Timer | I²C | 512B | Surface Mount | -40°C ~ 85°C (TA) | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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 | 56B | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3V | YY-MM-DD-dd | Alarm, Daylight Savings, NVRAM, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | 0°C ~ 70°C (TA) | 24-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 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 | |
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Nisshinbo Micro Devices
|
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- | - | - | - | - | - | - | - | - | - | - | |
Analog Devices / Maxim Integrated
|
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0.3µA ~ 1µA @ 2V ~ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, RAM, Trickle-Charger | 3-Wire Serial | 31B | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Unique ID, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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14µA ~ 15µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, SRAM | I²C, 2-Wire Serial | 128B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | |
BenchPro
|
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300µA @ 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 | |
BenchPro
|
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1.5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Parallel | 16B | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Renesas
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Dallas Semiconductor
|
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | - | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
|
Nisshinbo Micro Devices
|
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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 | 10-uMAX/uSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 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 (TA) | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Analog Devices / Maxim Integrated
|
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- | 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 ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 2.7V ~ 3.7V | YY-MM-DD | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C (TA) | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Analog Devices / Maxim Integrated
|
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1.2µA ~ 2µA @ 1.6V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, RAM, Square Wave Output, SRAM, Trickle Charger | I²C, Serial | 64B | Surface Mount | -40°C ~ 85°C (TA) | 8-WLP (2.07x2.27) | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | -40°C ~ 85°C | 24-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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7µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVRAM, Square Wave Output, SRAM, Supervisor, Trickle Charger, Watchdog Timer | I²C, 2-Wire Serial | 31B | Surface Mount | -40°C ~ 85°C (TA) | 20-QSOP | HH:MM:SS (12/24 hr) | Clock/Calendar/Supervisor | 2V ~ 3.6V | |
Intersil
|
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20µA ~ 500µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | 32B | Surface Mount | -40°C ~ 85°C | 20-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.2V ~ 6V | |
Harris Semiconductor
|
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50µA ~ 3mA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | - | 50B | Through Hole | 0°C ~ 70°C (TA) | 24-SBDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 3V ~ 6V | |
|
Analog Devices / Maxim Integrated
|
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2mA @ 2.7V ~ 3.7V | YY-MM-DD | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 4KB | Surface Mount | 0°C ~ 70°C (TA) | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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120µA ~ 160µA @ 3.3V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal | I²C, 2-Wire Serial | 236B | Surface Mount | 0°C ~ 70°C | 20-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 5.5V | |
Harris Semiconductor
|
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50µA ~ 3mA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | - | 50B | Through Hole | 0°C ~ 70°C (TA) | 24-CERDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 3V ~ 6V | |
Analog Devices / Maxim Integrated
|
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125µA @ 3.3V | YY-MM-DD-dd | Leap Year, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
|
Nisshinbo Micro Devices
|
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- | - | - | - | - | - | - | - | - | - | - | |
Harris Semiconductor
|
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50µA ~ 3mA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | - | 50B | Through Hole | 0°C ~ 70°C (TA) | 24-CERDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 3V ~ 6V | |
Harris Semiconductor
|
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20µA ~ 500µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | 32B | Surface Mount | -40°C ~ 85°C | 20-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.2V ~ 6V | |
Texas Instruments
|
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1µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year | Parallel | - | Surface Mount | -40°C ~ 85°C | 28-PLCC (11.51x11.51) | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.2V ~ 5.1V | |
|
Renesas
|
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Analog Devices / Maxim Integrated
|
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5mA ~ 10mA @ 3V ~ 5V | YY-MM-DD | EEPROM, Leap Year, RAM, SRAM | Parallel | 32KB | Through Hole | 0°C ~ 70°C (TA) | 28-EDIP | HH:MM:SS (12/24 hr) | Phantom Time Chip | 4.5V ~ 5.5V | |
Dallas Semiconductor
|
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4mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer | Parallel | 8KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 3V | |
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 | 4KB | Through Hole | -40°C ~ 85°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD-dd | EEPROM, Leap Year, NVSRAM, RAM | Parallel | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | Integrated | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | Integrated | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD | EEPROM, Leap Year, NVSRAM, RAM | Parallel | 512KB | Surface Mount | 0°C ~ 70°C (TA) | 34-PowerCap Module | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | Integrated | |
|
Nisshinbo Micro Devices
|
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- | - | - | - | - | - | - | - | - | - | - | |
Analog Devices / Maxim Integrated
|
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10mA @ 5V | YY-MM-DD | EEPROM, Leap Year, NVSRAM, RAM | Parallel | 512KB | Through Hole | 0°C ~ 70°C (TA) | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | Integrated | |
Dallas Semiconductor
|
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7mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 512KB | Surface Mount | 0°C ~ 70°C | 34-PowerCap Module | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 0.3V ~ 4.6V | |
BenchPro
|
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1mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Supervisor, Watchdog Timer | Parallel | - | Through Hole | 0°C ~ 70°C | 36-DIP Module (18.42x52.96) | HH:MM:SS:hh (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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4mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 512KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Diodes Incorporated
|
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0.65µA ~ 0.85µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 8-MSOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 5.5V |
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