MAX6917EO30+

Real Time Clock Overview

The MAX6917EO30+ is an I2C-compatible real-time clock (RTC) integrated with a microprocessor supervisory circuit, NV RAM controller, and backup-battery monitor. It provides timekeeping for seconds through year with leap-year compensation through 2099. The device includes 96 x 8 bits of static RAM for scratchpad storage and communicates via a fast 400kHz I2C interface. It features dual power-supply pins for primary and backup power, a battery-on output, and a programmable time/date alarm. The EO30 variant specifies a VCC operating voltage range of 2.7V to 3.3V. It operates over the extended temperature range of -40°C to +85°C in a 20-pin QSOP package.

Real Time Clock Feature Summary

• I2C-Compatible RTC with Leap-Year Compensation Through 2099
• Microprocessor Supervisor with Watchdog Input and Programmable Reset Thresholds
• NV RAM Controller with Chip-Enable Gating and Backup-Battery Monitor
• 96 x 8 Bits Static RAM for Scratchpad Data Storage

Real Time Clock Applications

• Point-of-Sale Equipment
• Programmable Logic Controllers
• Intelligent Instruments
• Fax Machines
• Digital Thermostats

Real Time Clock Procurement Notes

Verify the specific EO30 suffix indicates the 2.7V to 3.3V operating voltage range during procurement. Confirm the package code E20-2 corresponds to the 20-pin QSOP form factor required for the design. Ensure compatibility with the system's I2C bus timing requirements, specifically the 400kHz maximum clock frequency and bus timeout constraints.

Real Time Clock Selection Notes

Select the MAX6917EO30+ when the primary supply voltage is strictly within the 2.7V to 3.3V range. Choose this part if the application requires the specific reset threshold characteristics associated with the EO30 variant. Verify that the 20-pin QSOP package fits the PCB layout constraints and that the external crystal matches the specified 32.768kHz, 6pF load requirement.

Real Time Clock Part Context

The MAX6917 series integrates RTC, supervisor, and NV RAM functions into a single component. The EO30 designation distinguishes the electrical specifications, particularly the VCC operating limits, from other variants like the EO33 or EO50. All variants share the same pinout and functional architecture but differ in voltage thresholds and reset parameters.

Real Time Clock Replacement Considerations

Direct replacements must match the 20-pin QSOP package and I2C interface. Substitutes should be evaluated based on their specific VCC operating range relative to the 2.7V–3.3V specification of the EO30 variant. Verify that any alternative device supports the required 96-byte RAM capacity and similar supervisory features.