R2051T01-E2-F

Description：2 WIRE INTERFACE REAL-TIME CLOCK
Series：*

SKU:5a9250770b30 Category: Real Time Clocks Brand: Nisshinbo Micro Devices Inc.

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Product introduction

R2051T01-E2-F is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Nisshinbo Micro Devices Inc.. Its product description is 2 WIRE INTERFACE REAL-TIME CLOCK. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for R2051T01-E2-F

Description：2 WIRE INTERFACE REAL-TIME CLOCK
Series：*
Package：Tape & Reel (TR)
Mfr：Nisshinbo Micro Devices Inc.
Type：-
Features：-
Memory Size：-
Time Format：-
Date Format：-
Interface：-
Voltage - Supply：-
Voltage - Supply, Battery：-
Current - Timekeeping (Max)：-
Operating Temperature：-
Mounting Type：-
Grade：-
Qualification：-
Package / Case：-
Supplier Device Package：-

Real Time Clock datasheet and documents for R2051T01-E2-F

R2051T01-E2-F

Real Time Clock Overview

The R2051T01-E2-F is a CMOS real-time clock IC featuring a 2-wire I2C interface and battery backup switchover. It operates within a supply voltage range of 750 mV to 5.5 V, with a typical timekeeping current of 0.4 µA at 3 V. The device provides BCD-formatted time and calendar data, including automatic leap year recognition up to 2099. Key features include two alarm interrupt circuits (Alarm_W and Alarm_D) and a periodic interrupt circuit with selectable frequencies from 0.5 seconds to one month. It utilizes a TSSOP-10G package and includes built-in oscillation stabilization capacitors.

Real Time Clock Feature Summary

I2C Bus Interface: Supports standard and fast mode (up to 400 kHz) via SCL and SDA lines.
Battery Backup Switchover: Automatically switches between main power (VCC) and backup battery (VSB) based on voltage monitoring.
Time/Calendar Counters: BCD format for seconds, minutes, hours, day-of-week, date, month, and year with auto-leap year correction.
Interrupt Functions: Includes Alarm_W, Alarm_D, and periodic interrupt circuits; note that the INTR pin is not available on the R2051Txx series.

Real Time Clock Applications

Consumer electronics requiring precise timekeeping with low power consumption.
Industrial equipment needing battery-backed real-time clocks.
Automotive systems utilizing I2C communication for clock synchronization.

Real Time Clock Procurement Notes

Verify the specific suffix 'E2' corresponds to the taping type designation as per the manufacturer's selection guide. Confirm that the TSSOP-10G package dimensions align with the PCB footprint requirements. Ensure compatibility with the system's I2C bus voltage levels, noting the 5.5 V maximum input tolerance on SCL/SDA pins regardless of VDD.

Real Time Clock Selection Notes

Select this model for applications requiring a compact TSSOP-10G package. Note that unlike other R2051 variants, the R2051Txx series lacks the VDCC output pin and the physical INTR pin, although it retains the internal interrupt registers. The -VDET1 threshold is typically 2.40 V. Ensure the design accounts for the absence of external interrupt output if hardware interrupts are required.

Real Time Clock Part Context

This component belongs to the R2051 Series of 2-wire interface Real-Time Clock ICs. The 'T' in the part number designates the TSSOP10G package (4.0mm x 2.9mm x 1.0mm). The '01' indicates a typical voltage detector threshold of 2.40 V. The 'F' denotes lead-free plating for the terminals.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same series include R2051S01-E2-F (SSOP16) and R2051L01-E2 (QFN023023-16), though package changes are required. Other R2051 variants share functional similarities but differ in package size and the presence of specific output pins like INTR or VDCC.