Renesas X5323S8IZ-2.7A

Overview

X5323S8IZ-2.7A 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 2.7V to 5.5V, features a factory-programmed 2.85–3.0V reset threshold, supports -40°C to +85°C industrial temperature range, and delivers <20µA standby current with watchdog enabled at 3.6V - used in embedded microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.

For engineers reviewing the X5323S8IZ-2.7A datasheet, X5323S8IZ-2.7A pinout, X5323S8IZ-2.7A application, or X5323S8IZ-2.7A equivalent, this page provides verified functional identity, confirmed VTRIP programming capability, validated SOIC-8 pin mapping, real-world reset timing (200ms tPURST), and two documented alternative parts with explicit technical and application differences.

Technical Context

The X5323S8IZ-2.7A integrates four tightly coupled supervisory functions: a power-on reset generator asserting RESET/RESET down to VCC = 1V, a selectable watchdog timer with three timeout options (200ms/600ms/1.4s) controlled by nonvolatile WD0/WD1 bits, a low-VCC detector with reprogrammable trip point (2.85–3.0V nominal), and a 32kbit SPI EEPROM organized as 4k × 8 with Block Lock™ protection.

Its SPI interface complies with modes 0,0 and 1,1, supports 2MHz clocking, 32-byte page writes, and self-timed 10ms write cycles. The CS/WDI dual-function pin enables both chip select and watchdog kick, while WP and nonvolatile WPEN bit allow in-circuit programmable ROM mode for status register locking.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), body width 3.9mm, lead 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 STM8AF5288TDY, the X5323S8IZ-2.7A uniquely combines field-reprogrammable VTRIP, 32kbit Block Lock™ EEPROM, and industrial temperature support in a single-chip, zero-firmware solution - reducing validation scope and PCB footprint versus MCU alternatives.

Availability

X5323S8IZ-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic sensor nodes, automotive body control modules, smart energy meters, and battery-backed IoT gateways requiring stable component supply across extended product lifecycles.

Supply support for X5323S8IZ-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) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications - with emphasis on reliability and industrial-grade specifications.

The X5323 family was engineered specifically for embedded systems needing consolidated supervisory functions and nonvolatile storage - targeting cost-sensitive, space-constrained designs where discrete reset ICs plus external EEPROM would increase BOM count and board area.

FAQ

What is the factory-default reset threshold voltage for X5323S8IZ-2.7A?

The X5323S8IZ-2.7A ships with a factory-programmed VTRIP range of 2.85V to 3.0V (typical 2.92V), optimized for 3.3V systems. This value is stored in nonvolatile trim circuitry and remains stable over temperature and time unless explicitly reprogrammed using the VP-based sequence defined in the datasheet. The X5323S8IZ-2.7A does not require external components to achieve this threshold.

Can the watchdog timer timeout be changed after soldering the X5323S8IZ-2.7A onto a PCB?

Yes - the watchdog timeout on the X5323S8IZ-2.7A is set via nonvolatile WD0 and WD1 bits in the status register, which can be modified in-circuit using the WRSR instruction. Once programmed, the setting persists across power cycles. The X5323S8IZ-2.7A supports three fixed intervals: 200ms, 600ms, or 1.4s - no analog adjustment is possible, but digital reconfiguration is fully supported post-assembly.

Does X5323S8IZ-2.7A support SPI mode 0,1 or only modes 0,0 and 1,1?

The X5323S8IZ-2.7A explicitly supports only SPI modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1), as confirmed in the datasheet's "2MHz SPI interface modes (0,0 and 1,1)" specification. It does not support modes 0,1 or 1,0. Attempting to use unsupported modes will result in incorrect data sampling or communication failure. The X5323S8IZ-2.7A requires matching CPOL/CPHA configuration on the host controller.

How is EEPROM write protection implemented on X5323S8IZ-2.7A?

The X5323S8IZ-2.7A implements EEPROM write protection through three independent mechanisms: (1) Block Lock™ bits (BL0/BL1) that nonvolatily protect 0%, 25%, 50%, or 100% of memory; (2) Write Enable Latch (WEL) that must be set before each write; and (3) In-circuit programmable ROM mode activated by WP pin LOW + WPEN bit HIGH, which locks the entire status register. All protections are active simultaneously on the X5323S8IZ-2.7A.

Is X5323S8IZ-2.7A pin-compatible with earlier X25323/X25325 devices?

Yes - the X5323S8IZ-2.7A is a direct replacement for the obsolete X25323 and X25325 families, sharing identical 8-lead SOIC pinout, electrical characteristics, and command set. The datasheet states "X5323, X5325 (Replaces X25323, X25325)", and all pin functions, timing, and register maps match. No PCB layout changes are required when upgrading from X25323/X25325 to X5323S8IZ-2.7A.