Renesas X5323S8IZT1

Overview

X5323S8IZT1 from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 32kbit SPI EEPROM in a single 8-lead SOIC package. It asserts active-low RESET during power-up (≥200ms), monitors VCC down to 1V, supports selectable watchdog timeouts (200ms/600ms/1.4s), and provides block-lock EEPROM protection. It serves in microcontroller-based industrial control systems requiring reliable brown-out recovery and nonvolatile configuration storage.

For engineers reviewing the X5323S8IZT1 datasheet, X5323S8IZT1 pinout, X5323S8IZT1 application, or X5323S8IZT1 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the FN8131 Rev 3.00 datasheet and Intersil's official specifications.

Technical Context

The X5323S8IZT1 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 reset logic asserts RESET/RESET at VCC ≈1V and holds it active until VCC exceeds the programmable VTRIP threshold for 200ms (typical).

EEPROM operation uses SPI Mode 0,0 or 1,1 at up to 2MHz, with 32-byte page writes and self-timed 10ms (typ) write cycles. Block Lock™ protection is controlled by nonvolatile BL0/BL1 bits, enabling selective write-protection of 0%, 25%, 50%, or 100% of the 4KB memory array.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS-compliant), body width 3.9mm, standard JEDEC MS-012AC footprint.

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 STM6805RWY6F, the X5323S8IZT1 uniquely combines reprogrammable VTRIP, three watchdog timeout options, and 32kbit block-protected EEPROM - making it the only choice for systems requiring field-adjustable brown-out response and robust nonvolatile parameter storage.

Availability

X5323S8IZT1 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 across extended product lifecycles.

Supply support for X5323S8IZT1 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 X5323 family was designed to consolidate reset supervision, watchdog protection, and EEPROM storage into one IC - targeting cost-sensitive, space-constrained embedded systems needing high reliability and field-programmable voltage thresholds.

FAQ

What is the factory-default VTRIP setting for X5323S8IZT1?

The X5323S8IZT1 is ordered under the "-2.7" suffix, indicating a factory-programmed VTRIP range of 2.55V to 2.7V (typical 2.63V). This setting is confirmed in the Ordering Information table on page 2 of FN8131 Rev 3.00 and applies to all X5323S8IZ-2.7 variants including X5323S8IZT1.

Does X5323S8IZT1 support both active-high and active-low reset outputs?

No - X5323S8IZT1 is an X5323-series part and provides only active-low RESET/RESET output. The X5325 series offers active-high reset; X5323S8IZT1's pin 7 is strictly active-low open-drain, as defined in the Pin Descriptions section (page 3) and RESET Output Timing table (page 13) of the datasheet.

How is the watchdog timer enabled and configured on X5323S8IZT1?

The watchdog timer on X5323S8IZT1 is disabled at power-up (WD1=1, WD0=1). It is enabled by writing WD0/WD1 bits via the WRSR instruction to select 200ms (10), 600ms (01), or 1.4s (00). Once written, the timeout persists across power cycles unless rewritten - no volatile register controls it.

Can the EEPROM in X5323S8IZT1 be written while the watchdog is active?

Yes - EEPROM writes and watchdog operation are independent. The X5323S8IZT1 allows full SPI EEPROM access (read/write) regardless of watchdog state. However, if CS remains HIGH or LOW beyond the selected timeout, RESET/RESET will assert and halt MCU execution - potentially interrupting ongoing EEPROM writes.

What is the maximum SPI clock frequency supported by X5323S8IZT1?

X5323S8IZT1 supports SPI clock frequencies up to 2MHz, as specified in the AC Electrical Specifications table (page 11) under "Clock Frequency fSCK". This applies across the full 2.7V–5.5V VCC range and –40°C to +85°C operating temperature.