MAX6909EO30+T

Real Time Clock Overview

The MAX6909EO30+T is an I2C-compatible real-time clock (RTC) with a microprocessor supervisor and NV RAM controller. It provides timekeeping for seconds, minutes, hours, date, month, day of week, and year, including leap year compensation up to the year 2100. The device features 31 bytes of static RAM for scratchpad storage and operates on a single 2-wire serial bus interface. It supports operating voltages of 3V and 3.3V, with a typical timekeeping current of less than 1µA at 3.0V. The component includes a watchdog timer, manual reset input, and power-fail detection.

Real Time Clock Feature Summary

• I2C-compatible RTC with 31-byte NV RAM and microprocessor supervisor
• Dual power-supply pins for primary (VCC) and backup (BATT) power sources
• Built-in µP supervisor with open-drain and push-pull reset outputs
• Watchdog timer and manual reset input with push-button switch debounce

Real Time Clock Applications

• Point-of-Sale Equipment
• Programmable Logic Controller
• Handheld Instruments
• Medical Instrumentation

Real Time Clock Procurement Notes

Verify that the specific suffix 'EO30' corresponds to the 2.7V to 3.6V operating voltage range as defined in the datasheet. Confirm package type is 20-pin QSOP. Ensure the order quantity matches the manufacturer's standard packaging requirements. Check for RoHS compliance status before finalizing procurement.

Real Time Clock Selection Notes

Select the MAX6909 over the MAX6910 if a trickle charger is not required, as the MAX6910 includes this feature. Ensure the system design accommodates the 20-pin QSOP package dimensions. Verify that the external crystal meets the 32.768kHz frequency and 6pF load capacitance specifications for accurate timekeeping.

Real Time Clock Part Context

This component belongs to the MAX6909/MAX6910 family of I2C-compatible real-time clocks manufactured by Analog Devices / Maxim Integrated. The MAX6909 variant specifically excludes the trickle charger found in the MAX6910. Both devices share identical pinouts and core functionality regarding timekeeping and supervision.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.