Real Time Clocks

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Mfr Part #	Quantity Available	Price	Series	Package	Product Status	DigiKey Programmable	Type	Features	Memory Size	Time Format	Date Format	Interface	Voltage - Supply	Voltage - Supply, Battery	Current - Timekeeping (Max)	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
PCF2129AT/2,518 IC RTC CLOCK/CALENDAR I2C 20SO NXP USA Inc.	9,092 In Stock	1 : ₪19.35000 Cut Tape (CT) 2,000 : ₪10.88204 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Last Time Buy	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 4.2V	1.8V ~ 4.2V	1.5µA @ 3.3V	-40°C ~ 85°C	Surface Mount	20-SOIC (0.295", 7.50mm Width)	20-SO
PCF2129T/2,518 IC RTC CLOCK/CALENDAR I2C 16SO NXP USA Inc.	4,324 In Stock	1 : ₪22.04000 Cut Tape (CT) 1,000 : ₪12.80576 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Last Time Buy	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 4.2V	1.8V ~ 4.2V	1.5µA @ 3.3V	-40°C ~ 85°C	Surface Mount	16-SOIC (0.295", 7.50mm Width)	16-SO
PCF2129AT/1,512 IC RTC CLOCK/CALENDAR I2C 20SO NXP USA Inc.	0 In Stock	Obsolete	-	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 4.2V	1.8V ~ 4.2V	1.5µA @ 3.3V	-40°C ~ 85°C	Surface Mount	20-SOIC (0.295", 7.50mm Width)	20-SO
PCF2129AT/1,518 IC RTC CLOCK/CALENDAR I2C 20SO NXP USA Inc.	0 In Stock	Obsolete	-	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 4.2V	1.8V ~ 4.2V	1.5µA @ 3.3V	-40°C ~ 85°C	Surface Mount	20-SOIC (0.295", 7.50mm Width)	20-SO

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Real Time Clocks (RTCs) provide time and/or date information in almost any electronic device which needs to keep accurate time. The clock types are binary counter, clock/calendar/supervisor, elapsed time counter, phantom time chip, portable system controller, temperature recorder, time event recorder, and timer clock peripheral. They contain memory sizes ranging from 2 B to 2 MB and have interface options of I2C, Parallel, Serial, SPI, 1-Wire, 2-Wire, 3-Wire, and 4-Wire.