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

PCF2123TS/1,118 IC RTC CLK/CALENDAR SPI 14TSSOP NXP USA Inc.	28,523 In Stock	1 : ¥12.23000 Cut Tape (CT) 2,500 : ¥5.59674 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	SPI	1.6V ~ 5.5V	-	0.33µA ~ 0.38µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	14-TSSOP (0.173", 4.40mm Width)	14-TSSOP
PCF2129T/2,518 IC RTC CLOCK/CALENDAR I2C 16SO NXP USA Inc.	3,977 In Stock	1 : ¥50.82000 Cut Tape (CT) 1,000 : ¥28.81867 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	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
PCA2129T/Q900/2,51 IC RTC CLOCK/CALENDAR I2C 16SO NXP USA Inc.	2,785 In Stock	1 : ¥52.46000 Cut Tape (CT) 1,000 : ¥27.72691 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	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
PT7C4337ACSE IC RTC CLK/CALENDAR I2C 16SOIC Diodes Incorporated	120 In Stock	1 : ¥55.66000 Tube 48 : ¥47.96646 Tube	-	Tube Tube	Active	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 5.5V	-	0.8µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	Surface Mount	16-SOIC (0.295", 7.50mm Width)	16-SOIC
PCF2131TFY IC RTC CLK/CALENDAR I2C 16HLSON NXP USA Inc.	0 In Stock Check Lead Time	1 : ¥30.79000 Cut Tape (CT) 4,000 : ¥15.43866 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	Clock/Calendar	Alarm, Leap Year, SRAM, Watchdog Timer	8B	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	I2C, SPI	1.2V ~ 5.5V	1.2V ~ 5.5V	770nA ~ 2.135µA @ 1.2V ~ 5.5V	-40°C ~ 85°C (TA)	Surface Mount, Wettable Flank	16-LFDFN Exposed Pad	16-HLSON (4.5x3.5)
PCF2129AT/2,518 IC RTC CLOCK/CALENDAR I2C 20SO NXP USA Inc.	0 In Stock Check Lead Time	1 : ¥49.01000 Cut Tape (CT) 2,000 : ¥24.58055 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	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

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.