Renesas X5043S8IZ-2.7T1

Overview

X5043S8IZ-2.7T1 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in a single 8-lead SOIC package. It features 2.93V reset threshold, -40°C to +85°C industrial temperature range, and operates across 2.7–5.5V VCC. It serves as system-level reliability manager in microcontroller-based embedded systems requiring fail-safe boot and nonvolatile configuration storage.

For engineers reviewing the X5043S8IZ-2.7T1 datasheet, X5043S8IZ-2.7T1 pinout, X5043S8IZ-2.7T1 application, or X5043S8IZ-2.7T1 equivalent, key selection criteria include its reprogrammable VTRIP threshold, 200ms reset timeout, 1.4s/600ms/200ms selectable watchdog intervals, block-lock EEPROM protection, and compatibility with standard SPI buses up to 3.3MHz.

Technical Context

The X5043S8IZ-2.7T1 implements a dual-function CS/WDI pin for chip select and watchdog input, with internal reset generation triggered by VCC falling below 2.93V ±2.5% or watchdog timeout. Its status register contains nonvolatile WD0/WD1 bits that persist across power cycles and determine watchdog interval without external configuration.

EEPROM operation uses Intersil's Direct Write™ cell architecture, enabling 1M write cycles and 100-year data retention. Block lock protection is controlled via BL0/BL1 bits in the status register, allowing selective write-protection of 0%, 25%, 50%, or 100% of the 512×8-bit array - independent 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 MAX6361KA29-T and MCP9800T-E/MS, the X5043S8IZ-2.7T1 uniquely combines reprogrammable voltage monitoring, three-interval watchdog, and 4Kbit block-locked EEPROM in one SOIC-8 package - enabling compact, self-contained system supervision where configurability and long-term data integrity are essential.

Availability

X5043S8IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, medical diagnostics, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for X5043S8IZ-2.7T1 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

Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and trusted computing solutions for industrial, automotive, and communications markets.

The X5043 family was designed specifically for embedded systems needing integrated power supervision, fail-safe reset, and reliable nonvolatile storage - reducing design complexity and improving field reliability in space-constrained applications.

FAQ

What is the factory-default VTRIP voltage for X5043S8IZ-2.7T1?

The X5043S8IZ-2.7T1 ships with a factory-programmed VTRIP of 2.93V ±2.5%, corresponding to the "-2.7A" suffix in the ordering matrix. This threshold is guaranteed over temperature and remains stable unless explicitly reprogrammed using the VP=15–18V sequence defined in the datasheet. The "2.7" in the part number indicates the 2.7–5.5V VCC operating range, not the trip voltage.

Does X5043S8IZ-2.7T1 support both active-low and active-high reset outputs?

No - X5043S8IZ-2.7T1 provides only an active-low open-drain RESET output. The X5045 variant offers active-high RESET, but the X5043 series (including X5043S8IZ-2.7T1) is exclusively active-low. The datasheet confirms RESET/RESET is "active low/HIGH" only in comparative context; the X5043 pin is strictly active-low, requiring an external pull-up resistor for proper logic level translation.

How is the watchdog timeout interval selected on X5043S8IZ-2.7T1?

The watchdog timeout is selected by writing nonvolatile WD0 and WD1 bits in the status register using the WRSR instruction. Factory default is WD1=1, WD0=1 (watchdog disabled). Valid combinations yield 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0). These bits retain their value across power cycles, eliminating need for MCU reconfiguration after each reset.

Can X5043S8IZ-2.7T1's EEPROM be written to while the watchdog is enabled?

Yes - EEPROM writes are fully supported with watchdog enabled. The watchdog monitors only CS/WDI pin transitions; as long as the MCU toggles CS before timeout, memory operations proceed normally. However, during a write cycle, the WIP bit in the status register must be polled to avoid bus contention, and WP pin must be HIGH to permit writes regardless of watchdog state.

What package type and lead finish does X5043S8IZ-2.7T1 use?

X5043S8IZ-2.7T1 uses an 8-lead SOIC package (3.9mm × 4.9mm) with Pb-free plus anneal termination - 100% matte tin plating compatible with both SnPb and Pb-free soldering processes. The "-T1" suffix confirms tape-and-reel packaging for automated assembly, and the "I" denotes industrial temperature grade (-40°C to +85°C).