X4643S8I-2.7

Supervisors Overview

The X4643S8I-2.7 is a supervisory circuit manufactured by Renesas Electronics Corporation, designed for CPU monitoring and system protection. It integrates a voltage supervisor with a 64Kbit I2C EEPROM and a watchdog timer within a single 8-pin SOIC package. The device operates with a threshold voltage of 2.7V and supports a supply voltage range up to 5.5V. Key electrical characteristics include an active low open-drain output, a reset delay time of 400ms, and a maximum operating temperature of +85°C. The component is RoHS compliant and features manual reset capability.

Supervisors Feature Summary

• Integrates CPU supervision, watchdog timer, and non-volatile memory in a compact package
• Provides reliable system reset via active low open-drain output with defined delay
• Supports serial communication through I2C interface for data storage and retrieval

Supervisors Applications

• Embedded systems requiring combined power monitoring and data retention
• Industrial control units needing watchdog functionality for fault recovery
• Consumer electronics utilizing low-voltage microcontroller architectures

Supervisors Procurement Notes

Verify the exact suffix 'I' indicates industrial temperature range and '2.7' specifies the reset threshold. Confirm RoHS compliance status through official Renesas documentation prior to integration. Check current production status as this specific part number may be subject to discontinuation or lifecycle changes. Ensure compatibility with existing PCB footprint and signal levels during procurement planning.

Supervisors Selection Notes

Select this component when a design requires simultaneous voltage supervision, watchdog timing, and persistent data storage without consuming multiple IC footprints. The 8-SOIC package offers a balance between pin count and board space efficiency. Consider the 2.7V threshold against the target system's minimum operating voltage to ensure proper reset assertion during brown-out events.

Supervisors Part Context

This part belongs to the X4643 series of supervisory circuits from Renesas, which combine monitoring functions with embedded memory. It is distinct from the X5043 series which typically uses different packaging or memory configurations. The device serves as a critical reliability component in systems where software integrity and power stability are paramount.

Supervisors Replacement Considerations

Publicly confirmed substitute part numbers include the X5043S8IZ series. Verify pinout compatibility and electrical parameter equivalence before substitution. Note that suffix variations may indicate differences in package type or temperature rating.

Supervisors FAQ

Does the X4643S8I-2.7 support manual reset?

Yes, the device includes a manual reset input pin allowing external triggering of the reset function.

What is the interface type for the integrated EEPROM?

The integrated 64Kbit EEPROM utilizes an I2C serial interface for data access and configuration.