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New RTC DS1302 Real Time Clock Module Module voltage compatible with 3.3V / 5V, can be connected to 3.3V or 5V SCM 3v 260mAh backup battery (not rechargeable batteries) Crystal oscillator 32.768KHz Working temperature 0°C to 70°C 4 positioning holes, diameter 3.1mm Size: 44 x 23 x 1.6mm Features: The real time clock has the ability to calculate prior to the 2100 second, minute, hour, day, week, month, year, and the ability to adjust a leap year 31 8 temporary data storage RAM Serial I / O port pin makes the least number of ways Wide range of operating voltage 2V - 5.5V When The working voltage is 2V, the current is less than 300nA Read/write clock or RAM data have two transmission ways: Single-byte / many bytes group 8 feet DIP assembly or optional 8 feet SOIC encapsulation according to surface assembly Simple 3 line interface Optional industrial temperature range -40°C to +85°C Dual power tube for the main power and backup power supply TL compatible (Vcc = 5V) Note: Do not reverse VCC and GND, it will cause damage. It requires a pull-up resistor for P0 port of 51 MCU, if without, you can connect the data cable to other terminal. Package included: DS1302 real time clock module The battery that accepts the product is 2032!