Automotive ICs

For Automotive 105°C 2-wire Real-time Clock S-35390A H Series

The S-35390A H Series is a CMOS 2-wire real-time clock IC which operates with the very low current consumption, 105°C operation in the wide range of operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35390A H Series can be used for various power supplies from main supply to backup battery. Due to the 0.25 μA current consumption and wide range of power supply voltage at time keeping, the S-35390A H Series makes the battery life longer. In the system which operates with a backup battery, the included free registers can be used as the function for user's backup memory. Users always can take back the information in the registers which is stored before power-off the main power supply, after the voltage is restored.
The S-35390A H Series has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the oscillation circuit's frequency deviation. Correcting according to the temperature change by combining this function and a temperature sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature.

Caution: This product can be used in vehicle equipment and in-vehicle equipment. Before using the product for these purposes, it is imperative to contact our sales representatives.


Low current consumption
0.25 µA typ. (Vdd =3.0 V, Ta =+25°C)
Wide operating voltage range
1.3 to 5.5 V
Built-in clock correction function
Built-in free user register
2-wire (I2C-BUS) CPU interface
Built-in alarm interrupter
Built-in flag generator during detection of low power voltage or at 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)
Operating temperature range
Ta = −40°C to +105°C
Lead-free (Sn 100%), halogen-free
AEC-Q100 qualified*1

1. Contact our sales representatives for details.

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.
  • These descriptions may be different from the actual product name and parameter.
    Please confirm the product name and specifications with the data sheet again.
  • The information herein is subject to change without notice.