DP8570AVX vs DS17487-3+
| Part Number |
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| 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-EDIP |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| 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 | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Through Hole |
| Package / Case | 28-LCC (J-Lead) | 24-DIP Module (0.600\", 15.24mm) |
| Supplier Device Package | 28-PLCC (11.51x11.51) | 24-EDIP |
| Memory Size | 44B | 4KB |
| Voltage - Supply, Battery | 2.2V ~ 5.1V | 2.5V ~ 3.7V |
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1. How does a real-time clock work?
RTC is usually driven by a low-power oscillator (such as a quartz crystal oscillator) and powered by an independent power source (such as a battery), which can continuously time even when the main power supply is off.
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2. How does RTC maintain time even when the device is powered off?
RTC is usually equipped with an independent small battery (such as a button battery) to ensure that it continues to run for time when the device's main power is turned off, until the battery is depleted or re powered.
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3. How to communicate with real-time clock in the device?
Real time clocks typically communicate with microcontrollers or other processors through I2C or SPI communication interfaces, allowing for the reading and setting of time and other related information.
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4. How often do RTC batteries need to be replaced?
The battery life of RTC can usually last for several years, depending on the type of battery used, the power consumption of RTC, and the ambient temperature. Generally speaking, button batteries can last for 5-10 years under normal conditions.
