R2033L-E2

Real Time Clock Overview

The R2033L-E2 is a CMOS real-time clock IC from the Nisshinbo Micro Devices R2033x series, utilizing a QFN023023-16 package. It interfaces with CPUs via three signal lines (CE, SCLK, SIO) for serial data transmission. The device maintains time and calendar data in BCD format, supporting automatic leap year identification up to 2099. Key electrical parameters include a minimum timekeeping voltage of 0.66 V (typical) to 5.5 V maximum, with a typical current consumption of 0.45 µA at 3 V. It features two alarm circuits, periodic interrupts, and a high-precision oscillation adjustment circuit.

Real Time Clock Feature Summary

• Three-wire serial interface (CE, SCLK, SIO) with maximum clock frequency of 1 MHz.
• Low power consumption: 0.45 µA typical at VDD=3V during timekeeping.
• Built-in oscillation stabilization capacitors and high-precision frequency adjustment circuit.
• Dual alarm interrupt circuits (Alarm_W and Alarm_D) and selectable periodic interrupts.

Real Time Clock Applications

• Industrial equipment requiring precise timekeeping.
• Social infrastructure systems needing long-term reliability.
• General-purpose consumer applications with low power constraints.

Real Time Clock Procurement Notes

The R2033L-QFN023023-16 variant was discontinued by Nisshinbo Micro Devices as of August 2023. Verification of availability should focus on existing stock or alternative packages within the R2033x family, such as the TSSOP10G version, which remains active. Ensure that any substitute components maintain compatibility with the required 3-wire interface and voltage specifications.

Real Time Clock Selection Notes

Select the R2033L-E2 when a compact QFN023023-16 footprint (2.3mm x 2.3mm x 0.4mm) is required for high-density mounting. This package option provides built-in oscillation capacitors and supports a supply voltage range down to 0.66 V for extended battery life. Verify that the design accommodates the specific pinout of the QFN package, including the exposed pad connection to VSS.

Real Time Clock Part Context

The R2033L-E2 belongs to the R2033x family of 3-wire interface Real-Time Clock ICs. The 'L' designation specifically identifies the QFN023023-16 package type, distinguishing it from the TSSOP10G (R2033T) and FFP12 (R2033K) variants. The E2 suffix indicates the taping type for reel packaging. This component is part of Nisshinbo's CMOS RTC lineup designed for low-power, high-precision timing applications.

Real Time Clock Replacement Considerations

The R2033L-QFN023023-16 package is discontinued as of August 2023. Designers may consider the R2033T-E2 (TSSOP10G) as a functional replacement if the larger package dimensions are acceptable. Both share identical electrical characteristics and register maps, ensuring software compatibility while addressing physical form factor differences.