RTC-4553A2

Real Time Clock Overview

The RTC-4553 is a serial-interface real-time clock module manufactured by Epson. It integrates a 32.768 kHz crystal unit, eliminating the need for external frequency adjustment. The device provides automatic calendar functions including year, month, day, day of the week, hour, minute, and second, with automatic leap year correction up to 2099. It features built-in 120-bit (30 x 4-bit) SRAM for data storage. Operating specifications include a supply voltage range of 2.7 V to 5.5 V and an operating temperature range of -30°C to +70°C.

Real Time Clock Feature Summary

• Integrated 32.768 kHz crystal unit for adjustment-free operation
• Automatic calendar function with leap year correction
• Built-in 120-bit SRAM for user data storage
• Serial interface control via SIN, SCK, CS0, CS1, and WR pins

Real Time Clock Applications

• General-purpose timekeeping in electronic devices
• Data logging applications requiring timestamping
• Systems needing low-power real-time tracking

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and configuration. Confirm that the required supply voltage and operating temperature range align with the target application environment before procurement.

Real Time Clock Selection Notes

Select this component when a serial interface is preferred over I2C or SPI protocols. Ensure the design accommodates the SOP-14 pinout and the specific control logic required for the synchronous serial communication. Verify that the 120-bit SRAM capacity meets the system's data retention requirements.

Real Time Clock Part Context

The RTC-4553 belongs to Epson's series of serial-interface real-time clock modules. It is designed as a standalone solution for precise timekeeping without the complexity of external oscillator circuits. The module is distinct from the I2C-based RX series and the SPI-based RA/RA series.

Real Time Clock Replacement Considerations

Direct replacements require matching the serial interface protocol and pinout. Consider Epson models such as the RTC-4543 or RTC-4574 if similar serial functionality is needed. Cross-compatibility with other manufacturers' serial RTCs requires careful verification of timing parameters and register maps.