Renesas X5329S8Z

Overview

X5329S8Z from Renesas Electronics is a CPU supervisor IC with integrated 32Kbit SPI EEPROM, combining power-on reset control, supply voltage supervision, and block-lock protected nonvolatile memory in a single 8-lead SOIC package. It provides active-high RESET output, supports 4.5V–5.5V operation, features programmable VTRIP threshold (4.5–4.75V for this variant), and delivers <1µA standby current with 2MHz SPI interface compliance.

For engineers reviewing the X5329S8Z datasheet, X5329S8Z pinout, X5329S8Z application, or X5329S8Z equivalent, this device serves as a system-level voltage monitor and configuration storage solution for microcontroller-based embedded systems requiring reliable brownout detection, power-up sequencing, and tamper-resistant parameter retention.

Technical Context

The X5329S8Z integrates a precision low-VCC detection circuit with 200ms reset timeout and 1V valid reset assertion, enabling robust power-fail recovery in industrial controllers and IoT edge nodes. Its reset logic asserts RESET/RESET active high when VCC drops below the factory-programmed 4.5–4.75V trip point and holds it until VCC stabilizes above that threshold for 200ms.

Internally, the device combines a serial peripheral interface (SPI Mode 0,0 and 1,1) with an 8K × 4 EEPROM array organized as 4K × 8, supporting 32-byte page writes and self-timed 5ms typical write cycles. Block lock protection (BL0/BL1 bits) allows selective write-protection of 0%, 25%, 50%, or 100% of memory, controlled via WRSR instruction and hardware WP pin interaction.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, Pb-free plus anneal finish, moisture sensitivity level per JEDEC J-STD-020.

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 STM8AF6266TCY, the X5329S8Z uniquely delivers field-reprogrammable VTRIP, larger 32Kbit EEPROM, and true plug-and-play integration - making it optimal for applications requiring post-deployment calibration tuning and robust parameter retention without MCU overhead.

Availability

X5329S8Z is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pump controllers, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X5329S8Z 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The X5329S8Z belongs to Renesas' CPU Supervisor with EEPROM product line, designed specifically to consolidate power monitoring, reset generation, and secure nonvolatile storage into a single chip for resource-constrained embedded systems.

FAQ

What is the reset polarity and output type of the X5329S8Z?

The X5329S8Z features an active-HIGH open-drain RESET/RESET output. This means the pin drives high (via external pull-up) when asserting reset and floats when inactive. The X5329S8Z variant differs from the X5328 series by providing active-HIGH reset, matching MCU inputs that require high-level reset assertion. Its output remains valid down to VCC = 1V, ensuring reliable behavior during deep brownout.

Can the VTRIP threshold of the X5329S8Z be adjusted after manufacturing?

Yes, the X5329S8Z supports field reprogramming of its VTRIP threshold using a defined VP pulse sequence applied to SCK and SI pins. For the X5329S8Z-4.5A variant, the factory setting is 4.5–4.75V, but it can be increased to any value between 1.7V and 5.0V. Reprogramming requires applying VP = 15–18V to both SCK and SI while holding CS and WP HIGH, then pulsing CS LOW/HIGH. This capability enables fine-tuning for specific board-level supply tolerances.

How does the X5329S8Z protect EEPROM contents from unintended writes?

The X5329S8Z implements three layers of write protection: (1) a volatile Write Enable Latch (WEL) that must be set via WREN instruction before each write; (2) nonvolatile Block Lock bits (BL0/BL1) that permanently protect 0%, 25%, 50%, or 100% of memory; and (3) In-Circuit Programmable ROM mode enabled by WPEN bit + grounded WP pin, which disables all Status Register writes. These mechanisms ensure robust data integrity across power cycles and environmental stress.

What is the maximum SPI clock frequency supported by the X5329S8Z?

The X5329S8Z supports SPI clock frequencies up to 2MHz across its full operating voltage range (4.5–5.5V). This is validated per AC characteristics in the FN8132 datasheet, with minimum cycle time tCYC = 500ns. The device operates in SPI modes 0,0 and 1,1, meaning CPOL = 0/1 and CPHA = 0, compatible with most ARM Cortex-M, PIC, and AVR microcontrollers without requiring bit-banged software SPI.

Does the X5329S8Z meet automotive or extended temperature requirements?

The base X5329S8Z variant is rated for 0°C to +70°C commercial operation. However, Renesas offers the X5329S8IZ-4.5A variant - identical functionality with -40°C to +85°C industrial temperature range and same 4.5–4.75V VTRIP. Both share the M8.15E SOIC package and RoHS-compliant Pb-free plus anneal finish. For automotive use, designers should verify qualification status per AEC-Q100; the X5329S8Z itself is not automotive-qualified, but the industrial-grade variant supports harsher environments found in under-hood and cabin modules.