S-35190A-I8T1U

Real Time Clock Overview

The S-35190A-I8T1U is a CMOS 3-wire real-time clock IC manufactured by ABLIC Inc., housed in an 8-pin SNT-8A package. It operates within a voltage range of 1.3 V to 5.5 V, with typical current consumption of 0.25 µA at 3.0 V during timekeeping. The device features a built-in 32.768 kHz crystal oscillation circuit, auto-calendar functionality up to the year 2099 with leap year calculation, and a free user register for backup memory. Communication occurs via a 3-wire (MICROWIRE) interface using CS, SCK, and SIO pins.

Real Time Clock Feature Summary

• Low current consumption: 0.25 µA typ. at VDD = 3.0 V, Ta = +25°C
• Wide operating voltage range: 1.3 V to 5.5 V
• Built-in clock correction function and free user register
• Auto-calendar up to 2099 with automatic leap year calculation

Real Time Clock Applications

• Mobile game devices
• Digital still cameras
• Electronic power meters
• Mobile phones and PHS devices

Real Time Clock Procurement Notes

Verify that the ordering suffix I8T1U corresponds to the SNT-8A package with tape packing and lead-free (Sn 100%), halogen-free environmental compliance. Confirm pin compatibility when replacing older SOP or TSSOP variants, as physical dimensions differ. Ensure the supply voltage meets the minimum 1.3 V requirement for proper oscillation start.

Real Time Clock Selection Notes

Select this component for applications requiring low power backup battery operation due to its 0.25 µA timekeeping consumption. The SNT-8A package offers a compact form factor suitable for high-density circuit designs. Ensure external quartz crystals match the specified CL value of 6 pF and Cg limit of 9.1 pF for accurate frequency deviation performance.

Real Time Clock Part Context

The S-35190A series includes variations such as S-35190A-J8T1 (8-Pin SOP) and S-35190A-T8T1 (8-Pin TSSOP). The I8T1U suffix specifically denotes the SNT-8A package type. All variants share identical electrical characteristics and functional registers, differing only in physical package dimensions and land pattern specifications.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements include S-35190A-J8T1U and S-35190A-T8T1U from ABLIC, provided the PCB footprint accommodates the respective SOP or TSSOP packages. Cross-package substitution requires mechanical re-evaluation.