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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments
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100µA @ 3V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 242B | Surface Mount | 0°C ~ 70°C | 24-SSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Texas Instruments
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
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 | |
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 | |
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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
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 | |
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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
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 | -40°C ~ 85°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | |
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 | - | Through Hole | 0°C ~ 70°C | 28-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | |
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 | -40°C ~ 85°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | |
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 | 2.3V ~ 4V | |
NXP Semiconductors
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1.2µA ~ 5µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 125°C | 10-HVSON (3x3) | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
NXP Semiconductors
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10µA ~ 50µA @ 1V ~ 5V | YY-MM-DD | Alarm, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 240B | Surface Mount | -40°C ~ 85°C | 20-HVQFN (5x5) | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.5V ~ 6V | |
Texas Instruments
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- | 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 | |
Texas Instruments
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Texas Instruments
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
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 | 2.3V ~ 4V | |
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 | -40°C ~ 85°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | |
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 | - | Through Hole | 0°C ~ 70°C | 28-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | |
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 | 2.3V ~ 4V | |
Texas Instruments
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1mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm | Parallel | - | Through Hole | -40°C ~ 85°C | 32-DIP Module (18.42x52.96) | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
NXP Semiconductors
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1.8µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | - | Surface Mount | -40°C ~ 125°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
NXP Semiconductors
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1.8µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | - | Surface Mount | -40°C ~ 125°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
NXP Semiconductors
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1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 20-SO | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
NXP Semiconductors
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1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | 512B | Surface Mount | -40°C ~ 85°C | 20-SO | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
NXP Semiconductors
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0.33µA ~ 0.38µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | - | Surface Mount | -40°C ~ 85°C | 16-HVQFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
NXP Semiconductors
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1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 20-SO | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
NXP Semiconductors
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1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | 512B | Surface Mount | -40°C ~ 85°C | 20-SO | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
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NXP Semiconductors
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0.6µA ~ 0.75µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | Die | HH:MM:SS (24 hr) | Clock/Calendar | 1V ~ 5.5V | |
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NXP Semiconductors
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NXP Semiconductors
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NXP Semiconductors
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NXP Semiconductors
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NXP Semiconductors
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0.4µA @ 1.6V ~ 5.5V | Binary | Square Wave Output, Unique ID | I²C, 2-Wire Serial | - | - | -40°C ~ 85°C | Die | Binary | Binary Counter | 1.6V ~ 5.5V | |
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NXP Semiconductors
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0.4µA @ 1.6V ~ 5.5V | Binary | Square Wave Output, Unique ID | I²C, 2-Wire Serial | - | - | -40°C ~ 85°C | Die | Binary | Binary Counter | 1.6V ~ 5.5V | |
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NXP Semiconductors
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0.4µA @ 1.6V ~ 5.5V | Binary | Square Wave Output, Unique ID | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-WLCSP | Binary | Binary Counter | 1.6V ~ 5.5V | |
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NXP Semiconductors
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0.6µA ~ 0.75µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | Die | HH:MM:SS (24 hr) | Clock/Calendar | 1V ~ 5.5V | |
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NXP Semiconductors
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0.9µA ~ 1.8µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 125°C | Die | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
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0.3µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
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0.3µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
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2µA @ 3.3V | 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 | |
Renesas
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2µA @ 3.3V | 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 | |
Renesas
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | 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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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 | 32-TQFP (7x7) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Epson
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0.7µA ~ 0.9µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
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5µA ~ 10µA @ 2V ~ 5V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | -40°C ~ 85°C | 24-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 4.5V ~ 5.5V |
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