RTC-4543SB:A

Real Time Clock Overview

The RTC-4543SB:A is a Real-Time Clock (RTC) integrated circuit manufactured by Epson, designed for precise timekeeping and calendar functions. It features a 3-wire serial interface and supports date formats including YY-MM-DD and day-of-week. The device operates within a supply voltage range of 2.5V to 5.5V and consumes a maximum current of 1µA to 3µA depending on the voltage level. Packaged in an 18-SOP (0.213" width) surface-mount format, it is rated for industrial temperatures from -40°C to +85°C. Key functional attributes include leap year compensation and support for both 12-hour and 24-hour time formats.

Real Time Clock Feature Summary

• 3-wire serial interface for data communication
• Integrated calendar with leap year compensation
• Low power consumption: 1µA ~ 3µa @ 2V ~ 5V
• Industrial temperature range: -40°C to +85°C

Real Time Clock Procurement Notes

Verify the exact part status as some listings indicate the RTC-4543SB series may be discontinued or subject to last-time buy notices. Confirm that the 'A' suffix does not require specific ordering codes distinct from standard availability checks. Ensure compatibility with existing board designs regarding the 18-SOP footprint and voltage levels before procurement.

Real Time Clock Part Context

This component belongs to the Epson RTC-4543SB series of real-time clock ICs. While specific documentation for the 'A' suffix variant is limited in public databases, it shares core specifications with the widely documented RTC-4543SB:B3 model, including the 18-SOP package and 3-wire serial interface. The 'A' designation typically denotes specific manufacturing lot or revision details rather than a change in electrical function.