Renesas X5323S8IZ-4.5A

Overview

X5323S8IZ-4.5A 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 power sequencing and nonvolatile configuration storage.

For engineers reviewing the X5323S8IZ-4.5A datasheet, X5323S8IZ-4.5A pinout, X5323S8IZ-4.5A application, or X5323S8IZ-4.5A equivalent, this device serves as a drop-in replacement for legacy X5323PIZ-4.5A and X5323PZ-4.5A supervisors, offering reprogrammable VTRIP, volatile reset-source flag detection, and 32-byte page write EEPROM with <10ms typical write cycle time.

Technical Context

The X5323S8IZ-4.5A integrates four tightly coupled supervisory functions: a power-on reset generator asserting RESET/RESET down to VCC = 1V, a selectable watchdog timer (200ms/600ms/1.4s) triggered by CS/WDI transitions, a low-VCC detector with five standard trip points (this variant fixed at 4.5V–4.75V), and a 32kbit SPI EEPROM organized as 4k × 8 with Block Lock™ protection. All functions share a common SPI interface (SCK, SI, SO, CS/WDI) and status register access.

Its architecture enables deterministic reset behavior: RESET/RESET remains active for ≥200ms after VCC exceeds VTRIP, and the volatile flag bit (FLB) distinguishes watchdog-induced resets from brown-out events. The device supports in-circuit programmable ROM mode via WP pin and WPEN bit, locking watchdog and block protect settings against accidental writes.

Key Specifications

Pinout & Package

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

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 STM6315SW33DX, the X5323S8IZ-4.5A uniquely combines factory-trimmed 4.63V reset accuracy, field-reprogrammable VTRIP, and 32kbit EEPROM in one SOIC-8 package - reducing component count and enabling adaptive voltage monitoring without layout changes.

Availability

X5323S8IZ-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

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

The X5323 family was designed to replace discrete reset + EEPROM solutions in microcontroller-based systems - delivering higher reliability, smaller footprint, and enhanced configurability for embedded supervisory functions.

FAQ

What is the factory-set VTRIP voltage range for X5323S8IZ-4.5A?

The X5323S8IZ-4.5A has a factory-programmed VTRIP range of 4.5V to 4.75V (typical 4.63V), specified for operation across -40°C to +85°C. This threshold is fixed at shipment but can be reprogrammed using the VP programming sequence described in the FN8131 datasheet. The device retains its programmed VTRIP value across power cycles and temperature variations.

Does X5323S8IZ-4.5A support both active-low and active-high reset outputs?

No, the X5323S8IZ-4.5A provides only an active-low RESET/RESET output (open-drain). It belongs to the X5323 series, which is distinct from the X5325 series that offers active-high reset. To use active-high reset, the X5325S8IZ-4.5A would be required - it shares identical packaging and EEPROM functionality but differs in reset polarity and default VTRIP.

How does the watchdog timer in X5323S8IZ-4.5A get enabled and configured?

The watchdog timer in X5323S8IZ-4.5A is disabled at power-up (WD1=1, WD0=1). It is enabled by writing to the nonvolatile WD0 and WD1 bits in the status register using the WRSR instruction. Three timeout periods are available: 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0). Once set, the timeout persists across power cycles unless rewritten.

Can the EEPROM in X5323S8IZ-4.5A be written while the watchdog is running?

Yes, the EEPROM in X5323S8IZ-4.5A supports concurrent operation with the watchdog timer. Writes to the 32kbit array do not interfere with watchdog timing or reset assertion. However, during an EEPROM write cycle, the WIP bit is set and the device ignores new instructions until the internal self-timed write completes (~10ms), so watchdog refresh must occur outside active write windows.

What is the purpose of the WP pin on X5323S8IZ-4.5A, and how does it interact with WPEN?

The WP pin on X5323S8IZ-4.5A enables hardware write protection for the status register when combined with the nonvolatile WPEN bit. When WPEN = 1 and WP is held LOW, all status register writes (including watchdog and block lock settings) are blocked - creating an in-circuit programmable ROM mode. Setting WPEN = 0 disables this hardware lock, allowing full status register access regardless of WP state.