RS5C348A-E2-F

Real Time Clock Overview

The RS5C348A-E2-F is a CMOS real-time clock IC featuring a 4-wire serial interface (CE, SCLK, SI, SO) for CPU communication. It provides timekeeping and calendar functions in BCD format with automatic leap year identification up to 2099. The device operates within a supply voltage range of 1.45V to 5.5V, consuming typical current of 0.35µA at 3V. Key features include two alarm interrupt circuits, a periodic interrupt circuit with selectable frequencies from 0.5 seconds to monthly, and a controllable 32kHz clock output. It incorporates built-in oscillation stabilization capacitors, an oscillation halt sensing circuit, and a supply voltage monitoring function with selectable thresholds.

Real Time Clock Feature Summary

• 4-wire serial interface supporting maximum clock frequency of 2 MHz
• Low power consumption: Typical 0.35µA at VDD=3V
• Built-in oscillation adjustment circuit for high-precision timekeeping
• Supply voltage monitoring with selectable thresholds (1.6V or 2.1V)

Real Time Clock Applications

• Systems requiring precise timekeeping with low power consumption
• Devices needing battery backup status monitoring via supply voltage detection
• Applications utilizing external microcomputers requiring 32kHz sub-clock output

Real Time Clock Procurement Notes

Verify component authenticity against official Nisshinbo Micro Devices documentation. Confirm package type matches SSOP10 specifications. Check for discontinuation notices as the RS5C348 series may be subject to end-of-life status. Ensure ordering suffixes align with lead plating and taping requirements specified in the datasheet.

Real Time Clock Selection Notes

Select RS5C348A if control over the 32kHz clock output is required, as it can be disabled via command. Choose RS5C348B if the 32kHz output must remain permanently enabled. Verify that the 4-wire serial interface compatibility exists with the target CPU. Ensure operating temperature range of -40°C to +85°C meets system environmental requirements.

Real Time Clock Part Context

The RS5C348A-E2-F belongs to the Rx5C348A/B family of CMOS real-time clocks. It is packaged in an ultra-compact SSOP10 format with a pin pitch of 0.5mm. The 'E2' suffix indicates the taping type, while 'F' denotes lead-free plating. This model integrates internal capacitors and oscillation correction capabilities distinct from earlier serial RTC generations.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Discontinued variants include RV5C348A-E2-FB and RT5C348B series. Consult manufacturer guidelines for cross-referencing compatible devices.