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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15mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | 0°C ~ 70°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
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 | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
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 | 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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3mA @ 4.5V ~ 5.5V | 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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2mA @ 2.7V ~ 3.7V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 8KB | 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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6mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, 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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4mA @ 3.3V | 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 | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 128KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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4mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 128KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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4mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 128KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Diodes Incorporated
|
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125µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.5V ~ 3.7V | |
Diodes Incorporated
|
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1.5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
Diodes Incorporated
|
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125µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-TDFN (2x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.5V ~ 3.7V | |
|
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 | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Diodes Incorporated
|
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125µA @ 2.7V ~ 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 | 1.5V ~ 3.7V | |
Nisshinbo Micro Devices
|
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0.9µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, RAM | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-TSSOPG | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.5V ~ 5.5V | |
|
Nisshinbo Micro Devices
|
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1µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | QFN023023-16 | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.34V ~ 5.5V | |
|
Nisshinbo Micro Devices
|
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0.9µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, RAM, SRAM | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 18-QFN (2x2) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.63V ~ 5.5V | |
NXP Semiconductors
|
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0.5µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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 | SPI | - | Surface Mount | -40°C ~ 85°C | 10-uMAX/uSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
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Analog Devices / Maxim Integrated
|
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500µA @ 3.3V | Binary | Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | Binary | Binary Counter | 1.3V ~ 3.63V | |
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 | 24-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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 | 0°C ~ 70°C | 32-TQFP (7x7) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Intersil
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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 | |
Analog Devices / Maxim Integrated
|
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1.3mA @ 5V | 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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0.5µA @ 1.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM | I²C | 16B | Surface Mount | -40°C ~ 85°C (TA) | 6-TDFN-EP (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Epson
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0.5µA @ 3V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 10-SMD | - | Time Event Recorder | 1.25V ~ 5.5V | |
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Analog Devices / Maxim Integrated
|
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0.33µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | - | Surface Mount | -40°C ~ 85°C | 8-WLP (.97x1.97) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 3.6V | |
Diodes Incorporated
|
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0.65µA ~ 0.7µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
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 | |
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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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 | 0°C ~ 70°C | 16-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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Analog Devices / Maxim Integrated
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- | - | - | - | - | - | - | - | - | - | - | |
Dallas Semiconductor
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 128KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Intersil
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4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | I²C, 2-Wire Serial | 8B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
BenchPro
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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 | 2.3V ~ 4V | |
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-SOIC | HH:MM:SS (12/24 hr) | 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 | |
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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 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 | |
Intersil
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5.5µA ~ 6.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, SRAM | I²C | 128B | Surface Mount | -20°C ~ 70°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 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 | SPI, 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-uMAX | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Intersil
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 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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