Renesas X5043PI-2.7

Overview

X5043PI-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in an 8-lead SOIC package. It provides active-low RESET output, 2.85–3.0V V_TRIP threshold, 200ms reset timeout, and operates across –40°C to +85°C for industrial embedded systems requiring reliable brownout protection and nonvolatile configuration storage.

For engineers reviewing the X5043PI-2.7 datasheet, X5043PI-2.7 pinout, X5043PI-2.7 application, or X5043PI-2.7 equivalent, this device serves as a system-level reliability component for microcontroller-based designs where deterministic reset behavior, programmable voltage thresholds, and block-lock EEPROM co-location are critical selection criteria.

Technical Context

The X5043PI-2.7 implements a dual-function architecture: analog voltage monitoring with hysteresis-based V_TRIP detection and digital SPI EEPROM with block lock protection. Its reset circuit asserts RESET/RESET until V_CC exceeds 2.85V and remains stable for 200ms, while its watchdog timer monitors CS/WDI transitions with four selectable timeouts (200ms/600ms/1.4s/disabled) controlled by nonvolatile status register bits WD0 and WD1.

EEPROM operation uses a 3.3MHz SPI interface with 16-byte page writes and Direct Write™ technology enabling 1M write cycles and 100-year data retention. Block lock protection (BL0/BL1 bits) allows selective write-protection of 0%, 25%, 50%, or 100% of the 512×8-bit array, enforced independently of WP pin state when WEL is set.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), 3.9mm × 4.9mm body, 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.

Compared with MCP9808-E/P and MAX6361KA29+T, the X5043PI-2.7 uniquely integrates voltage supervision, watchdog, and EEPROM in one die-reducing board space, eliminating interconnect timing skew, and ensuring atomic configuration updates during reset events.

Availability

X5043PI-2.7 is available at Aetrix Electronics and suitable for industrial process controllers, network routers & switches, and battery-powered IoT gateways requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5043PI-2.7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and mixed-signal ICs for industrial, communications, and computing markets.

The X5043 family was engineered to consolidate system-level reliability functions-power monitoring, fault recovery, and nonvolatile storage-into a single SPI-compatible device for resource-constrained microcontroller platforms.

FAQ

What is the factory-set V_TRIP voltage for X5043PI-2.7?

The X5043PI-2.7 ships with a factory-programmed V_TRIP of 2.85–3.0V, optimized for 2.7V nominal supply systems. This threshold is laser-trimmed and remains stable over temperature and time. It can be reprogrammed to custom values using the VP = 15–18V method described in the datasheet, but the default setting requires no configuration for standard 2.7V operation.

Does X5043PI-2.7 support both active-low and active-high reset outputs?

No-X5043PI-2.7 provides only an active-low RESET/RESET output (open-drain). The X5045 variant offers active-high reset, but X5043PI-2.7 is strictly active-low. External pull-up is required for proper logic level translation, and the output remains valid down to V_CC = 1V, ensuring robustness during deep brownout conditions.

How does the watchdog timer in X5043PI-2.7 get reset?

The watchdog timer in X5043PI-2.7 is reset by a high-to-low transition on the CS/WDI pin within the selected timeout period (200ms/600ms/1.4s). Unlike conventional watchdogs, it does not require periodic data writes-only a CS toggle. If CS remains static beyond the timeout, RESET/RESET activates. The timeout value is stored in nonvolatile status register bits WD0 and WD1, preserving setting across power cycles.

Can X5043PI-2.7's EEPROM be written to while the watchdog is enabled?

Yes-X5043PI-2.7 allows simultaneous EEPROM writes and watchdog operation. The watchdog monitors CS/WDI activity independently of memory access. However, during a write cycle (up to 10ms), the SO pin is busy and CS must remain low; this may interfere with watchdog toggling if not timed correctly. Best practice is to disable the watchdog (WD0=WD1=1) during bulk EEPROM programming.

What package type and lead finish does X5043PI-2.7 use?

X5043PI-2.7 is supplied in an 8-lead SOIC package (3.9mm × 4.9mm) with Pb-free (RoHS-compliant) matte tin plating. It meets IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for lead-free reflow and is compatible with both SnPb and Pb-free soldering processes per Intersil's "Pb-Free Plus Anneal" specification.