Automotive ICs

Introduction – Automotive Real-time Clock (RTC)

The automotive real-time clock achieves longer battery life due to 0.25µA low current consumption.

1. Low current consumption of 0.25μA

ABLIC’s real-time clock achieves longer battery life by ultra-low current consumption of 0.25µA. The system standby current during engine shutdown can be significantly reduced.
Normally, power supply is supplied from the 12V auxiliary battery to the real-time clock via our LDO, etc. As with real-time clock for General use, it is also possible to connect a coin battery or rechargeable battery directly to the real-time clock and operate it.
This supports backup measuring time when the 12V auxiliary battery is attached or detached.

Communication Diode Interrupt Quartz Crystal Sub battery orSuper capacitor MCU *1 *2 12V Battery LDO RTC S-35190A H S-35390A H

*1: DAISHINKU CORP. SMD Tuning Fork Crystal Resonators for Automotive DMX-26S (CL = 6 pF, 32.768 kHz) ) 
*2: NGK Insulators, Ltd. Chip-type Ceramic Rechargeable Battery EnerCera🄬 ET1210C-H, Constant Voltage(CV) 2.7V charging condition


2. High-accuracy clock correction, minimum resolution of 1ppm

The frequency deviation of a quartz crystal can be corrected over a wide range with high accuracy at a  minimum resolution of 1ppm. By combining the real-time clock with a temperature sensor IC, the value of clock correction can be set according to the temperature change, enabling accurate correction if the clock becomes fast or slow.

High-accuracy clock correction


3. 8-Pin SOP and 8-Pin TSSOP packages available

ABLIC’s automotive real-time clock adopts standard gull-wing shaped 8-Pin SOP and 8-Pin TSSOP packages marked by excellent mountability.Automotive RTC package list



Series Name
(Product Overview)
Data SheetInterfaceCurrent
(3.0V, 25°C)
min (V)
max (V)
range min (°C)
range max (°C)
Series NameFeaturesPackage
S-35190A HPDF3-wire0.251.35.5Clock correction, free user register-401058-Pin SOP, 8-Pin TSSOP
S-35390A HPDF2-wire0.251.35.5Clock correction, free user register-401058-Pin SOP, 8-Pin TSSOP

If you can not find the product, please click here or contact our sales representatives.