RTT21064

Real Time Clock Overview

The RTT21064 is an I2C bus interface real-time clock oscillator manufactured by Raltron Electronics. It integrates a 32.768kHz TCXO and supports calendar functions including year, month, day, hour, minute, and second tracking with leap year autocorrection. The device operates on a power supply voltage of 1.6V to 5.5V and maintains timekeeping via a backup battery input ranging from 1.2V to 5.5V. Typical current consumption is 1.0µA. Frequency accuracy is specified at ±23ppm maximum at +25°C. It features a digital offset function for calibration and is housed in an SMD3225 package measuring 3.2mm x 2.5mm x 1.0mm.

Real Time Clock Feature Summary

• I2C bus interface with slave address 0x64/0x65
• Built-in 32.768kHz TCXO with ±23ppm max frequency accuracy at +25°C
• Digital offset function for sub-second clock adjustment
• SMD3225 surface mount package (3.2mm x 2.5mm x 1.0mm)

Real Time Clock Applications

• Portable electronic devices requiring low power consumption
• Small size electronic systems needing integrated timing
• Battery-powered equipment utilizing backup battery support

Real Time Clock Procurement Notes

Verify the specific ordering suffix and revision level against the manufacturer's latest documentation before procurement. Confirm that the required operating temperature range (-40°C to +85°C) aligns with the target application environment. Ensure proper decoupling capacitors are included in the design as specified in the datasheet for stable operation.

Real Time Clock Selection Notes

Select this component when an I2C-compatible real-time clock with integrated TCXO stability is required. The 1.6V to 5.5V supply range allows flexibility in system voltage design. Consider the digital offset feature if precise timekeeping without external crystal trimming is necessary. Verify that the SMD3225 footprint fits within the mechanical constraints of the final enclosure.

Real Time Clock Part Context

The RTT21064 is part of Raltron Electronics' real-time clock module lineup. It combines timing logic with a temperature-compensated crystal oscillator to reduce board space compared to discrete solutions. The device is designed for applications where low profile and minimal current draw are critical design parameters.

Real Time Clock Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Evaluate alternative RTC modules based on I2C compatibility, package dimensions, and voltage specifications if substitution is required.

Real Time Clock FAQ

What is the default I2C slave address for the RTT21064?

The default I2C slave address is 0x64 for write operations and 0x65 for read operations.

How does the digital offset function work?

The digital offset function adjusts the sub-second clock based on values set in the digital offset register. Calibration occurs every 10 seconds, allowing for positive or negative ppm adjustments without changing the oscillation frequency.

What is the maximum frequency accuracy specification?

The frequency accuracy is ±23ppm maximum at +25°C with VDD=3.0V.