S-35390A-T8T1G

Real Time Clock Overview

The S-35390A-T8T1G is a CMOS 2-wire real-time clock IC manufactured by ABLIC Inc. It operates within a voltage range of 1.3 V to 5.5 V and features a typical timekeeping current consumption of 0.25 µA at 3.0 V. The device includes an internal 32.768 kHz crystal oscillation circuit with built-in capacitance, requiring only an external capacitor on the XIN pin. Key specifications include an I²C interface supporting up to 400 kHz, auto-calendar functionality until 2099 with leap year calculation, and two interrupt pins (INT1, INT2). It is housed in an 8-pin TSSOP package.

Real Time Clock Feature Summary

• Low current consumption: 0.25 µA typ. during timekeeping at VDD = 3.0 V
• 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
• TV and VCR systems

Real Time Clock Procurement Notes

Verify that the ordering suffix 'T8T1' corresponds to the 8-Pin TSSOP package with tape packing specification as defined in the product name structure. Confirm the environmental code 'G' indicates lead-free status per manufacturer specifications. Ensure compatibility with the required I²C bus voltage levels for the target system design.

Real Time Clock Selection Notes

Select this component when a low-power real-time clock with integrated oscillator is required for battery-operated portable electronics. The device supports both 12-hour and 24-hour modes and provides free user registers for backup memory functions. Consider the built-in clock correction feature if high precision is needed across varying temperature conditions without external sensors.

Real Time Clock Part Context

The S-35390A belongs to the S-35390 series of 2-wire real-time clocks from ABLIC Inc. The specific model S-35390A-T8T1G denotes the standard version packaged in an 8-pin TSSOP format. This series is designed for applications requiring precise timekeeping with minimal power drain, utilizing a CMOS process technology.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and register compatibility before considering alternative RTC ICs from other manufacturers.

Real Time Clock FAQ

What is the maximum I²C clock frequency supported by the S-35390A?

The S-35390A supports an I²C clock frequency (fSCL) of up to 400 kHz when the supply voltage is 3.0 V or higher.

How does the S-35390A handle leap years?

The device includes an automatic leap year calculation function that updates the calendar data correctly up to the year 2099.

What is the purpose of the Free Register in the S-35390A?

The Free Register is a 1-byte SRAM type register that users can set freely. In systems with backup batteries, it can be used as user backup memory to store information before main power loss.