DP8570AVX vs DS17885SN-3+

Part Number	DP8570AVX	DS17885SN-3+
Category	Clock/Timing - Real Time Clocks	Clock/Timing - Real Time Clocks
Manufacturer	Texas Instruments	Maxim Integrated
Description	IC RTC TCP PAR 28-PLCC	IC RTC CLK/CALENDAR PAR 24-SOIC
Package	Tape & Reel (TR)	Tube
Series	-	-
Type	Timer Clock Peripheral (TCP)	Clock/Calendar
Features	Alarm, Leap Year	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd
Interface	Parallel	Parallel
Voltage - Supply	4.5V ~ 5.5V	2.7V ~ 3.7V
Current - Timekeeping (Max)	1µA @ 5V	2mA @ 2.7V ~ 3.7V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	28-LCC (J-Lead)	24-SOIC (0.295\", 7.50mm Width)
Supplier Device Package	28-PLCC (11.51x11.51)	24-SOIC
Memory Size	44B	8KB
Voltage - Supply, Battery	2.2V ~ 5.1V	2.5V ~ 3.7V

1. What is Real Time Clock (RTC)?

Real time clock is an integrated circuit (IC) that can provide the current date and time, and can maintain time updates even after the device is powered off. It is commonly used in embedded systems, computers, handheld devices, etc.
2. Why do devices require real-time clocks?

Real time clocks are used to record and maintain accurate time and date, especially in the event of equipment power failure. It is very important in applications that require timestamps, scheduled events, scheduled logs, and so on.
3. How accurate is the real-time clock?

The accuracy of RTC usually depends on the clock source used (such as a crystal oscillator), and most RTC accuracies range from a few seconds to a few minutes per month. For higher precision, a temperature compensated crystal oscillator (TCXO) can be used.
4. Can real-time clocks be used to set timers or alarms?

Yes, many RTC chips have built-in alarm functions that can trigger interrupts at set times to perform specific tasks or wake up the system.