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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Renesas
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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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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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 | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Analog Devices / Maxim Integrated
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0.5µA @ 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 ~ 3.6V | |
Analog Devices / Maxim Integrated
|
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3mA @ 5V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | -40°C ~ 85°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD | Alarm, Leap Year, Square Wave Output, Unique ID | Parallel | 114B | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.7V ~ 3.3V, 4.5V ~ 5.5V | |
|
Analog Devices / Maxim Integrated
|
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4mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 8KB | Surface Mount | 0°C ~ 70°C | 34-LPM | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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50µA @ 5V | Binary | - | 3-Wire Serial | - | Through Hole | -40°C ~ 85°C | 8-PDIP | Binary | Elapsed Time Counter | 2.5V ~ 3.5V | |
Analog Devices / Maxim Integrated
|
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3mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 2KB | Through Hole | 0°C ~ 70°C | 24-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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3mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 8KB | 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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3mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | Parallel | 50B | Surface Mount | 0°C ~ 70°C | 44-MQFP (10x10) | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 8KB | 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 @ 4.5V ~ 5.5V | YY-MM-DD-dd | Leap Year, NVSRAM | 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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0.5µA @ 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-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.6V | |
Analog Devices / Maxim Integrated
|
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4mA @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Leap Year, NVSRAM | 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 @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 32KB | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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3mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Y2K | Parallel | 8KB | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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4mA @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 3V | |
Analog Devices / Maxim Integrated
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4mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer | Parallel | 32KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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10mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 32KB | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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7mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 4.5V ~ 5.5V | |
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-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 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 | |
Analog Devices / Maxim Integrated
|
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1.3mA @ 5V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | -40°C ~ 85°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 @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 8KB | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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4mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer | Parallel | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
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2mA @ 3V, 3mA @ 5V | YY-MM-DD-dd | NVSRAM | Parallel | 114B | Through Hole | 0°C ~ 70°C | 28-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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50µA @ 5V | Binary | - | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | Binary | Elapsed Time Counter | 2.5V ~ 3.5V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | - | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Analog Devices / Maxim Integrated
|
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0.5µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Unique ID, Y2K | 3-Wire Serial | 32B | Through Hole | -40°C ~ 85°C | 16-PDIP | HH:MM:SS (12/24 hr) | Temperature Recorder | 2.7V ~ 4.95V | |
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 | 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 | 4KB | 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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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 | |
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 | 113B | Through Hole | 0°C ~ 70°C | 24-EDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
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 | |
Analog Devices / Maxim Integrated
|
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3mA @ 5V | 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 | |
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 | 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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0.5µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Unique ID, Y2K | 3-Wire Serial | 32B | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Temperature Recorder | 2.7V ~ 4.95V | |
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 | Surface Mount | 0°C ~ 70°C | 28-TSOP | 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 | 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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- | YYYY-MM-DD | - | 3-Wire Serial | 32B | Through Hole | - | 24-PDIP | HH:MM:SS | with Temp. Recorder | 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 | 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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1.1mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | 0°C ~ 70°C | 16-PDIP | 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-PDIP | 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 | 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 | 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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