S-35190A-J8T1G

Real Time Clock Overview

The S-35190A-J8T1G is a CMOS 3-wire real-time clock IC manufactured by ABLIC Inc. It operates within a wide voltage range of 1.3 V to 5.5 V, ensuring compatibility with various power supplies and backup batteries. The device features low current consumption of 0.25 µA typical at 3.0 V for timekeeping. It includes an internal 32.768 kHz crystal oscillation circuit, auto-calendar functionality up to the year 2099 with leap year calculation, and a built-in clock correction register. The IC utilizes a 3-wire (MICROWIRE) serial interface and provides user-accessible free registers for data backup during power loss.

Real Time Clock Feature Summary

• Low current consumption: 0.25 µA typical at VDD = 3.0 V and Ta = +25°C
• Wide operating voltage range: 1.3 V to 5.5 V
• Built-in 32.768 kHz crystal oscillation circuit with external Cg
• Auto-calendar function up to the year 2099 with automatic leap year calculation
• 3-wire (MICROWIRE) CPU interface with chip select, serial clock, and bidirectional data pins

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 the ordering suffix J8T1G corresponds to the 8-Pin SOP (JEDEC) package in tape format with environmental code G. Confirm that the specific revision of the datasheet matches the production batch requirements. Ensure compatibility with the host system's 3-wire serial interface timing parameters before integration.

Real Time Clock Selection Notes

Select this component when a low-power RTC with a wide input voltage range is required. The built-in oscillation circuit reduces external component count. Ensure the application supports the 3-wire serial protocol. Consider the free register capacity if battery-backed memory storage is needed for system configuration data during main power failure.

Real Time Clock Part Context

The S-35190A series includes variants with different packaging options such as TSSOP and SNT-8A. The J8T1G designation specifically identifies the SOP package variant. Other suffixes like U indicate lead-free, halogen-free environmental compliance. The core functionality remains consistent across package types, differing primarily in physical dimensions and mounting style.

Real Time Clock Replacement Considerations

Direct substitutes must support 3-wire MICROWIRE interface and similar voltage ranges. Verify pinout compatibility for SOP-8 packages. Check if alternative RTCs offer comparable current consumption and calendar functions. Ensure the replacement supports the required alarm interrupt and clock correction features if utilized in the design.