FAQ Frequently Asked Questions

What is alarm interrupter?

Real-Time Clocks (RTC)Timer ICs

When the set alarm time comes, it outputs Lo from the INT pin. As a result, the power supply can be ...

What should I do if I can't fulfill the power on conditions described in the datasheet?

Real-Time Clocks (RTC)Timer ICs

The interface of this IC is reset normally and the master device can make normal communication if ph...

Are there any points to note when raising the power supply voltage?

Real-Time Clocks (RTC)Timer ICs

ABLIC's RTCs initializes at the same time when the power supply voltage is raised. If the rise time...

Where should the INT pin be connected when the INT pin is not used?

Real-Time Clocks (RTC)Timer ICs

It is recommended to connect to VDD or VSS pin.

How to calculate monthly rate for frequency?

Real-Time Clocks (RTC)Timer ICs

If the error range is ±10 ppm, it can be calculated below. ±10ｘ10-6ｘ60secｘ60minｘ24hourｘ30day = ±25.9...

Is it possible to output 32kHz?

Real-Time Clocks (RTC)Timer ICs

It's possible. Please set 32kHz output by register setting. Alternatively, we also have the S-35192...

Since the device code is the same as other devices used, it cannot be operated on the same bus line. Is there any products with different device codes?

Real-Time Clocks (RTC)Timer ICs

Consumer

Yes. There is a product called S-35391 with a different device code from S-35390, so please consider...

Is it possible to connect an oscillator instead of a quartz crystal to XIN/XOUT?

Real-Time Clocks (RTC)Timer ICs

Since we do not assume the use of connecting an oscillator to XIN/XOUT, please do not use it in such...

Are there any points to note about power dissipation and thermal resistance?

Real-Time Clocks (RTC)Timer ICs

Since self-heating is extremely low, there are no problems with power dissipation and thermal resist...

Is it possible to evaluate the matching between quartz crystal and ICs at ABLIC?

Real-Time Clocks (RTC)Timer ICs

Please contact each quartz crystal maker for matching evaluation.

What is the recommended Cg value?

Real-Time Clocks (RTC)Timer ICs

Cg is recommended from none to 9.1pF. The crystal oscillation circuit operates even when Cg is not c...

What is the recommended CL value for quartz crystal?

Real-Time Clocks (RTC)Timer ICs

When using the quartz crystal with a CL exceeding the rated value (7 pF) (e.g: CL = 12.5 pF), oscill...

Is there any RTCs built-in Quartz Crystal?

Real-Time Clocks (RTC)Timer ICs

There is no RTC with built-in quartz crystal. Although it is not RTCs, we have a wake-up timer IC wi...

Is there a backup battery connect pin?

Real-Time Clocks (RTC)Timer ICs

There is no backup battery connect pin. Even without this pin, by inserting a diode between the main...

What is free register?

Real-Time Clocks (RTC)Timer ICs

In the system which operates with a backup battery, the included free registers can be used as the f...

What is Function of Clock Correction?

Real-Time Clocks (RTC)Timer ICs

The function of clock correction is to correct advance / delay of the clock due to the deviation of ...

Is it possible to set the alarm interrupt including the years,months and days?

Real-Time Clocks (RTC)Timer ICs

Consumer

It can be set with a product called S-35399.

Product Category