X5043S8-2.7AT1

Supervisors Overview

The X5043S8-2.7AT1 is a single-channel power supply management circuit manufactured by Renesas (formerly Intersil/Xicor). It integrates CPU supervision functions including Power-on Reset, Watchdog Timer, and voltage monitoring with 4K-bit SPI Serial EEPROM. The device operates within a 2.7V to 5.5V supply range and features a selectable watchdog timer. It utilizes an active-low reset output with a typical delay of 400 ms. The component is housed in an 8-lead Plastic Dual Small Outline (SOIC) package and supports industrial temperature ranges.

Supervisors Feature Summary

• Integrates power-on reset control, supply voltage supervision, and watchdog timer functionality into a single package.
• Includes 4K-bit CMOS Serial EEPROM with block lock protection for critical data storage.
• Features re-programmable low VCC reset threshold voltages via special programming sequences.
• Supports standard SPI modes (0,0 & 1,1) with a clock rate up to 3.3MHz.

Supervisors Applications

• CPU system supervision in embedded controllers
• Battery-powered portable devices requiring low standby current
• Industrial systems needing watchdog timer protection
• Applications requiring non-volatile data retention with write protection

Supervisors Procurement Notes

Verify the manufacturer designation carefully, as this part was originally produced by Xicor and later acquired by Intersil, now Renesas Electronics. Confirm the specific suffix '2.7A' corresponds to the required reset threshold voltage. Check RoHS compliance status against the specific production lot, as older Xicor-branded inventory may differ from current Renesas specifications. Ensure the SOIC-8 package matches your PCB footprint requirements.

Supervisors Selection Notes

Select this component when a combined solution for voltage supervision and non-volatile memory is required to save board space. The 2.7V threshold version is suitable for systems operating at or above this minimum voltage. Consider the 400ms reset delay and 3.3MHz SPI interface speed for timing compatibility. Verify that the 8-pin SOIC package fits the design constraints compared to MSOP or PDIP alternatives.

Supervisors Part Context

This device belongs to the X5043 family of CPU supervisors. The family combines power management and memory functions to reduce system cost and increase reliability. Variants exist in different packages such as MSOP and PDIP, and with different reset thresholds. The S8 suffix specifically denotes the SOIC-8 plastic package configuration.

Supervisors Replacement Considerations

Direct substitutes include other X5043 variants with identical pinouts and functions but different packages or thresholds, such as X5043M8IZ-2.7T1 (MSOP package) or X5043PI-2.7A (PDIP package). Cross-reference tools should be used to verify parametric equivalence for specific application requirements.

Supervisors FAQ

What is the maximum standby current consumption?

The maximum standby current is less than 50µA with the watchdog timer enabled and less than 10µA with the watchdog timer disabled.

How many write cycles does the EEPROM support?

The integrated 4K-bit EEPROM array supports 1 million write cycle endurance.

Can the reset threshold voltage be adjusted?

Yes, while five standard reset threshold voltages are available, the low VCC reset threshold can be reprogrammed using a special programming sequence to meet custom requirements.