Renesas X5325S8IZ-2.7A

Overview

X5325S8IZ-2.7A from Intersil is a CPU supervisor IC with integrated 32kbit SPI EEPROM, active-high RESET output, 2.7V–5.5V supply range, factory-programmed 2.85–3.0V VTRIP threshold, and -40°C to +85°C industrial temperature rating. It provides power-on reset, watchdog timer (200ms/600ms/1.4s selectable), low-voltage supervision, and block-lock EEPROM protection for microcontroller-based embedded systems.

For engineers reviewing the X5325S8IZ-2.7A datasheet, X5325S8IZ-2.7A pinout, X5325S8IZ-2.7A application, or X5325S8IZ-2.7A equivalent, this device supports critical system-level functions including brown-out detection, firmware recovery via watchdog timeout flag, in-circuit reprogrammable VTRIP, and SPI EEPROM data logging with page-write efficiency.

Technical Context

The X5325S8IZ-2.7A integrates four independent functional blocks: a power-on reset generator asserting RESET/RESET at ~1V with 100–280ms timeout, a voltage monitor with factory-set 2.85–3.0V trip point and 20mV hysteresis, a nonvolatile watchdog timer with three fixed timeout intervals controlled by WD0/WD1 bits, and a 4kB SPI EEPROM array organized as x8 with Block Lock™ protection.

Its SPI interface operates at up to 2MHz using modes 0,0 and 1,1, supports MSB-first 8-bit opcodes and 16-bit addresses, and includes a volatile status register with WIP/WEL/BL0/BL1/WD0/WD1 bits. The CS/WDI pin serves dual roles: chip select input and watchdog trigger input requiring HIGH-to-LOW transitions to reset the timer.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and STM6809RWDJ6F, the X5325S8IZ-2.7A uniquely combines field-reprogrammable VTRIP, 32kbit EEPROM with Block Lock™, and industrial temperature support - making it optimal for applications needing both adaptive voltage supervision and secure, integrated nonvolatile storage.

Availability

X5325S8IZ-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for X5325S8IZ-2.7A 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X5325 family was designed to consolidate power supervision, watchdog safety, and nonvolatile data storage into a single chip for microcontroller-based systems where board space, reliability, and system-level fault coverage are critical.

FAQ

What is the factory-default VTRIP setting for X5325S8IZ-2.7A?

The X5325S8IZ-2.7A ships with a factory-programmed VTRIP range of 2.85V to 3.0V (typical 2.92V), optimized for 3.3V systems. This threshold is stored in nonvolatile circuitry and remains stable over temperature and time unless explicitly reprogrammed using the VP-based VTRIP adjustment sequence described in the FN8131 datasheet. The X5325S8IZ-2.7A does not require external components to achieve this trip point.

Does X5325S8IZ-2.7A support active-low reset functionality?

No, the X5325S8IZ-2.7A provides an active-HIGH RESET output only, as indicated by its "X5325" part numbering (X5323 = active-low, X5325 = active-high). Its RESET pin asserts HIGH when VCC falls below the VTRIP threshold or when the watchdog timer expires. To interface with processors requiring active-low reset, an external inverter or pull-down resistor network is necessary - the X5325S8IZ-2.7A itself does not offer configurable reset polarity.

How is the watchdog timeout interval selected on X5325S8IZ-2.7A?

The watchdog timeout interval on X5325S8IZ-2.7A is selected by programming two nonvolatile bits (WD0 and WD1) in the status register using the WRSR instruction. Valid combinations yield 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0); the factory default is disabled (WD1=1, WD0=1). Once written, these bits retain their state across power cycles and cannot be altered without issuing another WRSR command - the X5325S8IZ-2.7A enforces this persistence for system reliability.

Can the EEPROM in X5325S8IZ-2.7A be protected against accidental writes?

Yes, the X5325S8IZ-2.7A implements multiple EEPROM write protection mechanisms: hardware WP pin control (when WPEN=1), software-controlled Block Lock™ (via BL0/BL1 bits protecting 0%, 25%, 50%, or 100% of memory), and the mandatory WREN instruction before any write. These layers ensure that critical calibration or configuration data stored in the 32kbit EEPROM remains intact during firmware updates or unexpected power events - a core design feature of the X5325S8IZ-2.7A.

What SPI modes does X5325S8IZ-2.7A support, and what is the maximum clock frequency?

The X5325S8IZ-2.7A supports SPI modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1) at up to 2MHz clock frequency. It uses MSB-first transmission for all opcodes, addresses, and data, with SI latching on the rising SCK edge and SO driving on the falling edge. This dual-mode compatibility ensures interoperability with a broad range of microcontrollers - the X5325S8IZ-2.7A requires no mode configuration pins or external logic to adapt to host SPI peripheral settings.