Renesas X5325S8IZ-4.5A

Overview

X5325S8IZ-4.5A from Intersil is an active-high CPU supervisor IC with integrated 32kbit SPI EEPROM, power-on reset control, watchdog timer, and programmable voltage threshold (VTRIP = 4.5–4.75 V). It operates across –40°C to +85°C, supports 4.5–5.5 V supply, and delivers <50 µA standby current with watchdog enabled - used in industrial microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.

For engineers reviewing the X5325S8IZ-4.5A datasheet, X5325S8IZ-4.5A pinout, X5325S8IZ-4.5A application, or X5325S8IZ-4.5A equivalent, this device serves as a system-level supervisory solution combining reset generation, watchdog supervision, supply monitoring, and block-lock EEPROM - critical for embedded controllers where firmware integrity, power sequencing, and field-programmable trip points are mandatory.

Technical Context

The X5325S8IZ-4.5A implements a dual-function CS/WDI pin for chip select and watchdog input, with a volatile flag bit distinguishing watchdog vs. low-voltage reset causes. Its VTRIP threshold is factory-set at 4.5–4.75 V and reprogrammable via external 15–18 V VP pulses on SCK/SI pins under controlled VCC bias.

It features a 2 MHz SPI interface (modes 0,0 and 1,1), 32-byte page write capability, self-timed EEPROM writes (10 ms typical), and Block Lock™ protection enabling selective write-protection of 0%, 25%, 50%, or 100% of the 4-kbyte memory array - all managed through nonvolatile status register bits (BL0/BL1, WD0/WD1, WPEN).

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS-compliant), footprint-compatible with industry-standard 150-mil wide SOIC-8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA29+T and STM6315SW33DX, the X5325S8IZ-4.5A uniquely combines field-programmable VTRIP, 32 kbit block-locked EEPROM, and industrial temperature range in an SOIC-8 - making it optimal for systems needing post-deployment calibration, firmware resilience, and minimal external components.

Availability

X5325S8IZ-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, and automotive telematics gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X5325S8IZ-4.5A 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 high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X5325 series belongs to Intersil's CPU Supervisor product line, designed specifically for microcontroller-based systems needing integrated reset, watchdog, voltage monitoring, and nonvolatile memory - targeting industrial, medical, and automotive applications demanding reliability and field configurability.

FAQ

What is the factory-default VTRIP setting for X5325S8IZ-4.5A?

The X5325S8IZ-4.5A ships with a factory-programmed VTRIP range of 4.5 V to 4.75 V, optimized for 5 V systems. This threshold is stored nonvolatily and remains stable over temperature and time unless explicitly reprogrammed using the VP pulse sequence defined in the FN8131 datasheet. The X5325S8IZ-4.5A does not require external components to operate at this default setting.

Does X5325S8IZ-4.5A support both active-high and active-low reset outputs?

No - the X5325S8IZ-4.5A provides only an active-high RESET output (open-drain). Its sibling part X5323S8IZ-4.5A offers active-low RESET. The "X5325" prefix explicitly denotes active-high reset polarity, and this is hardwired in silicon; it cannot be changed via software or configuration bits. Always verify reset polarity compatibility before substituting into existing designs.

How is the watchdog timer enabled and configured on X5325S8IZ-4.5A?

The watchdog timer on X5325S8IZ-4.5A is disabled at power-up (WD1 = 1, WD0 = 1). To enable it, the host MCU must issue a WRSR command to write WD0/WD1 bits in the status register. Timeouts are fixed at 200 ms (WD1=1,WD0=0), 600 ms (WD1=0,WD0=1), or 1.4 s (WD1=0,WD0=0). Once set, the timeout persists across power cycles unless rewritten - the X5325S8IZ-4.5A does not auto-reset these bits on power-up.

Can the EEPROM in X5325S8IZ-4.5A be written while the watchdog is running?

Yes - the EEPROM and watchdog functions operate independently. The X5325S8IZ-4.5A allows concurrent EEPROM writes and watchdog supervision. However, during a write cycle, the WIP bit in the status register must be polled to avoid command collisions, and CS must remain LOW for the full 10 ms write duration. The watchdog continues monitoring WDI transitions regardless of EEPROM activity.

What is the minimum VCC level at which X5325S8IZ-4.5A guarantees RESET assertion?

The X5325S8IZ-4.5A guarantees RESET assertion down to VCC = 1 V, and the signal remains valid until VCC rises above the programmed VTRIP threshold and stabilizes for 100–280 ms. This ensures robust reset behavior during deep brown-outs and slow power ramps - a key design feature confirmed in the FN8131 datasheet's VRVALID specification and power-up timing diagrams.