Timer ICs / ASSPs

2-wire Realtime Clock S-35390A

The S-35390A is a low-current-consumption 2-wire CMOS real-time clock IC that features a wide operating voltage range (1.3 V to 5.5 V) and can be driven on a variety of supply voltages, from a main supply to a backup supply. The time keeping current consumption of 0.25 µA and time keeping operation voltage of 1.1 V enable greatly increased battery duration. In a system that operates on a backup battery, the free register incorporated in the real-time clock can be used for the user backup memory function. The user register can hold data on a supply voltage as low as 1.2 V (min.), so the data stored in the register before the main power supply was cut can be called any time after the voltage is restored. This product also includes a clock adjustment function that enables wide-ranging correction of deviation in the frequency of the crystal oscillator at a minimum resolution of 1 ppm. Also, by combining this function with a temperature sensor, the clock adjustment value can be set in accordance with changes in the temperature, which makes it possible to realize a clock function that retains a high degree of accuracy regardless of temperature variation.

Features

Low current consumption
0.25 µA typ. (Vdd =3.0 V, Ta =25°C)
Wide operating voltage range
1.3 to 5.5 V
Time keeping operation voltage
1.1 V
Built-in clock adjustment function
Built-in free user register
2-wire (I2C-BUS) CPU interface
Built-in alarm interrupter
Built-in flag generator at power down or power on
Auto calendar up to the year 2099, automatic leap year calculation function
Built-in constant voltage circuit
Built-in 32 kHz crystal oscillation circuit (Cd built in, Cg external)
Lead-free products

Applications

  • Digital still cameras
  • Digital video cameras
  • Electronic power meters
  • DVD recorders
  • TVs, VCRs
  • PHS
  • Mobile phones
  • Car navigation

Standard Circuit

Standard Circuit

Parts List

  • U(Ux), S and G at the end of the product name of ABLIC Inc. were used to indicate different material specifications as “environmental code”,
    however, these have now been unified into “lead-free and halogen-free” and are identical in terms of environmental quality.
  • Note: Lead-free plating other than 100% Sn is applied to some limited old products, therefore, please contact our sales representatives for details.
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