S-35399A03-J8T1U

Real Time Clock Overview

The S-35399A03-J8T1U is a CMOS 2-wire real-time clock IC from ABLIC Inc., operating within a voltage range of 1.3 V to 5.5 V. It features low current consumption of 0.34 μA typ. at 3.0 V and includes an internal 32.768 kHz crystal oscillation circuit with built-in capacitance. The device supports I²C-bus communication, provides auto-calendar functionality up to the year 2099 with leap year calculation, and offers a 24-bit binary up counter for elapsed time tracking. It incorporates three free user registers for backup memory and allows clock correction via a dedicated register.

Real Time Clock Feature Summary

• Low current consumption: 0.34 μA typ. (VDD = 3.0 V, Ta = +25°C)
• Wide operating voltage range: 1.3 V to 5.5 V
• Built-in 32.768 kHz crystal oscillation circuit with internal capacitance
• Auto-calendar function up to the year 2099 with automatic leap year calculation

Real Time Clock Applications

• Mobile game devices
• Digital still cameras
• Electronic power meters
• DVD recorders
• TVs and VCRs

Real Time Clock Procurement Notes

Verify that the ordering suffix J8T1 corresponds to the 8-Pin SOP (JEDEC) package with tape packing specification. Confirm environmental compliance codes match lead-free (Sn 100%) and halogen-free requirements as specified in the product name structure documentation.

Real Time Clock Selection Notes

Select this component when a low-power RTC with integrated oscillator is required for systems operating between 1.3 V and 5.5 V. Ensure the application utilizes an external capacitor on the XIN pin if the internal capacitance requires tuning, and verify that the I²C bus timing constraints align with the specified AC electrical characteristics for the target supply voltage.

Real Time Clock Part Context

The S-35399A03 is part of ABLIC's 2-wire real-time clock series designed for automotive and consumer electronics. The -J8T1U suffix indicates the specific package type (8-Pin SOP JEDEC), packing method (Tape), and environmental compliance (Lead-free, Halogen-free). This variant is optimized for space-constrained designs requiring reliable timekeeping with minimal power drain.

Real Time Clock Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Cross-referencing should focus on I²C-compatible RTCs with similar voltage ranges and integrated oscillator capabilities.

Real Time Clock FAQ

What is the maximum operating temperature for the S-35399A03?

The operating ambient temperature range is -40°C to +85°C.

How does the device handle power loss data retention?

The included free registers can be used as user backup memory. Data stored before main power-off can be retrieved after voltage restoration, provided the backup battery maintains operation within the detection voltage limits.

Can the clock frequency deviation be corrected?

Yes, the device has a built-in clock correction function using a dedicated register to adjust for frequency deviations caused by crystal oscillation circuit variations or temperature changes.