Renesas X5323S8IZ

Overview

X5323S8IZ from Intersil is a CPU supervisor IC with integrated 32kbit SPI EEPROM, combining power-on reset control, watchdog timer, supply voltage supervision, and block-lock protected memory in a single 8-lead SOIC package. It operates from 4.5V to 5.5V, features a factory-programmed 4.5V–4.75V reset threshold, supports -40°C to +85°C industrial temperature range, and delivers <50µA standby current with watchdog enabled - used in embedded microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.

For engineers reviewing the X5323S8IZ datasheet, X5323S8IZ pinout, X5323S8IZ application, or X5323S8IZ equivalent, this device serves as a drop-in replacement for legacy X5323PIZ-4.5A and provides reprogrammable VTRIP, volatile flag indication of reset cause, and 32-byte page write capability for fast EEPROM updates in space-constrained industrial controllers.

Technical Context

The X5323S8IZ implements a dual-function CS/WDI pin that enables both chip select and watchdog input functionality, with a programmable watchdog timeout (200ms/600ms/1.4s) controlled by nonvolatile WD0/WD1 bits. Its reset logic asserts active-low RESET/RESET when VCC drops below the 4.63V typical trip point and holds it active for ≥200ms after VCC recovery.

Internally, the device integrates an 8-bit SPI interface (modes 0,0 and 1,1), a 32kbit EEPROM array organized as 4k × 8 with Block Lock™ protection (0/¼/½/all array lock), and a status register with WIP, WEL, BL0/BL1, WD0/WD1, WPEN, and FLAG bits - all accessible via standard SPI opcodes including WREN, RDSR, WRSR, READ, and WRITE.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, Pb-free, -40°C to +85°C industrial grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X5323S8IZ, MAX6361KA29+T offers lower cost but sacrifices VTRIP flexibility and half the EEPROM capacity, while STM6809RWDJ6F provides wider VCC range and push-pull reset but forces external memory for configuration storage - making X5323S8IZ optimal for compact, field-calibratable embedded systems needing integrated reliability functions.

Availability

X5323S8IZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, automotive telematics gateways, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5323S8IZ 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 manufacturer specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X5323 family was designed to consolidate supervisory functions and nonvolatile storage into a single package for microcontroller-based systems where board space, reliability, and field serviceability are critical design constraints.

FAQ

What is the factory-default reset threshold voltage for X5323S8IZ?

The X5323S8IZ is shipped with a factory-programmed VTRIP range of 4.5V to 4.75V (typical 4.63V), matching its "-4.5A" suffix designation. This threshold is guaranteed over the full -40°C to +85°C operating temperature range and remains stable across 100-year data retention. The X5323S8IZ datasheet specifies tPURST = 200ms typical, ensuring robust power-up sequencing for 5V microcontrollers.

Can the watchdog timeout period of X5323S8IZ be changed after soldering?

Yes, the watchdog timeout period of X5323S8IZ is fully reconfigurable in-circuit via the WRSR instruction to set nonvolatile WD0/WD1 bits. Three options are available: 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0). The X5323S8IZ retains these settings across power cycles, and the watchdog is disabled by default (WD1=1, WD0=1) until explicitly enabled - enabling flexible firmware validation during development and field deployment.

How does the Block Lock™ protection work on X5323S8IZ EEPROM?

X5323S8IZ implements Block Lock™ protection via nonvolatile BL0/BL1 bits in the status register, allowing selective locking of 0%, 25%, 50%, or 100% of the 32kbit EEPROM array. When locked, protected sectors permit read access but reject write attempts unless the WP pin is driven LOW and WPEN bit is HIGH - creating a hardware-enforced ROM mode. This mechanism secures boot code in X5323S8IZ while permitting runtime updates to unprotected parameter regions.

Is X5323S8IZ pin-compatible with older Intersil supervisors like X5323PIZ-4.5A?

Yes, X5323S8IZ is a direct pin-compatible replacement for X5323PIZ-4.5A, sharing identical 8-lead SOIC footprint, pinout, and electrical specifications. Both devices use the same CS/WDI, SO, WP, VSS, SI, SCK, RESET/RESET, and VCC connections. The X5323S8IZ maintains full functional equivalence while adding RoHS compliance and enhanced manufacturability - enabling drop-in substitution without PCB redesign or firmware changes.

What is the maximum write endurance and data retention of X5323S8IZ EEPROM?

The X5323S8IZ EEPROM is rated for minimum 100,000 write/erase cycles and 100 years of data retention at +25°C, based on Intersil's Direct Write™ cell technology. These specifications apply across the full operating temperature range (-40°C to +85°C) and VCC supply (4.5V–5.5V). The X5323S8IZ achieves this reliability while supporting 32-byte page writes with 5ms typical cycle time - significantly improving endurance versus byte-write architectures under frequent update workloads.