Renesas X5329S8IZ

Overview

X5329S8IZ 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 supply operation, features reprogrammable VTRIP threshold (4.5–4.75V), and delivers <1µA standby current for embedded microcontroller systems requiring reliable boot sequencing and configuration storage.

For engineers reviewing the X5329S8IZ datasheet, X5329S8IZ pinout, X5329S8IZ application, or X5329S8IZ equivalent, this device serves as a system-level power integrity and firmware parameter retention solution-particularly where brownout immunity, in-circuit programmable ROM mode, and SPI-compatible EEPROM co-location are critical design requirements.

Technical Context

The X5329S8IZ integrates a precision low-VCC detection circuit with 200ms reset timeout and 1V valid reset assertion, enabling robust power-up sequencing for microcontrollers. Its reset logic asserts RESET/RESET active-high when VCC drops below the factory-set or user-reprogrammed VTRIP (4.5–4.75V nominal), holding until VCC exceeds VTRIP for 200ms.

Internally, it combines a serial peripheral interface (SPI Mode 0,0 and 1,1) with a 4K × 8 EEPROM array organized into three blocks (8K/8K/16K), supporting 32-byte page writes, 100,000 write cycles, and 100-year data retention. Block lock protection (BL0/BL1 bits) and WPEN-controlled in-circuit programmable ROM mode provide hardware-enforced write security.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, -40°C to +85°C industrial temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA29+T and STM8AF6266TCY, the X5329S8IZ uniquely delivers field-reprogrammable reset thresholds, hardware-enforced block lock, and guaranteed 100-year EEPROM retention-making it optimal for safety-critical or field-deployed systems where configuration integrity and long-term reliability are non-negotiable.

Availability

X5329S8IZ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5329S8IZ 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 trusted microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The X5329S8IZ belongs to Renesas' CPU supervisor family designed specifically for embedded systems needing concurrent power monitoring, deterministic reset generation, and secure nonvolatile parameter storage-all in a single compact package.

FAQ

What is the reset polarity and output type of the X5329S8IZ?

The X5329S8IZ features an active-HIGH open-drain RESET/RESET output. It asserts HIGH during power-up (at ~1V VCC) and during brownout conditions when VCC falls below the programmed VTRIP threshold. The output requires an external pull-up resistor to VCC and remains asserted for 200ms after VCC stabilizes above VTRIP. This behavior is confirmed in the FN8132 datasheet Section "PIN DESCRIPTION" and "PRINCIPLES OF OPERATION".

Can the VTRIP threshold of the X5329S8IZ be modified after manufacturing?

Yes, the X5329S8IZ supports field reprogramming of its VTRIP threshold using a defined VP pulse sequence applied to SCK and SI pins while CS and WP are held HIGH. The procedure allows adjustment to higher voltages within the 1.7–5.0V range, with accuracy of ±0.1V at 25°C. This capability is documented in FN8132 Rev 3.00 Sections "VCC Threshold Reset Procedure" and "VTRIP Programming Specifications".

How does the X5329S8IZ protect EEPROM contents from unintended writes?

The X5329S8IZ implements three layers of write protection: (1) a volatile Write Enable Latch (WEL) that must be set via WREN instruction before any write; (2) nonvolatile Block Lock bits (BL0/BL1) enabling 0%, 25%, 50%, or 100% array protection; and (3) In-Circuit Programmable ROM mode activated by WP pin LOW + WPEN bit HIGH, which disables Status Register writes. All mechanisms are detailed in FN8132 Sections "SPI SERIAL MEMORY" and "In Circuit Programmable ROM Mode".

What SPI modes and maximum clock frequency does the X5329S8IZ support?

The X5329S8IZ supports SPI Modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1) at up to 2MHz clock frequency. Data is transferred MSB-first, with SI latching on SCK rising edge and SO driving on SCK falling edge. These timing characteristics are specified in FN8132 Rev 3.00 "A.C. CHARACTERISTICS" table and "SPI SERIAL MEMORY" section.

Is the X5329S8IZ compatible with industrial temperature range requirements?

Yes, the X5329S8IZ is rated for -40°C to +85°C operation, as indicated by the "I" suffix in the part marking "X5329S8IZ-4.5A" and confirmed in the "Ordering Information" table on page 2 of FN8132 Rev 3.00. This makes it suitable for deployment in harsh environments such as factory automation, outdoor metering, and automotive under-hood applications.