Renesas X5329S8IZ-4.5A

Overview

X5329S8IZ-4.5A from Renesas Electronics is a CPU supervisor IC integrating power-on reset control, supply voltage supervision, and 32Kbit SPI EEPROM in an 8-lead SOIC package. It asserts an active-high RESET output when VCC falls below 4.5–4.75 V, supports 2.7–5.5 V operation, consumes <1 µA standby current, and features reprogrammable VTRIP for precision brownout detection in microcontroller-based industrial control systems.

For engineers reviewing the X5329S8IZ-4.5A datasheet, X5329S8IZ-4.5A pinout, X5329S8IZ-4.5A application, or X5329S8IZ-4.5A equivalent, this device delivers verified low-voltage monitoring with programmable trip points, block-lock EEPROM protection, and SPI interface timing compliance up to 2 MHz - critical for embedded system reliability validation and BOM consolidation.

Technical Context

The X5329S8IZ-4.5A implements a dual-stage reset architecture: a power-on reset circuit activates at ~1 V and holds RESET high for 100–280 ms, while the low-VCC detector monitors VCC against a factory-set 4.5–4.75 V threshold with 20 mV hysteresis. Both functions drive a single open-drain RESET/RESET output configured as active-high per the X5329 variant.

Its integrated 32Kbit (4K × 8) SPI EEPROM operates at up to 2 MHz using modes 0,0 and 1,1, supports 32-byte page writes with 5 ms typical write cycle time, and includes nonvolatile Block Lock™ protection (0%, 25%, 50%, or 100% array lock) controlled via WRSR instruction and WP pin interaction.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, Pb-free with matte tin anneal finish.

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-4.5A uniquely combines factory-trimmed 4.5–4.75 V reset, field-reprogrammable VTRIP, and 32 Kbit block-locked EEPROM in a pin-compatible 8-SOIC footprint - enabling both hardware-level reliability and post-deployment configuration flexibility without MCU intervention.

Availability

X5329S8IZ-4.5A 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-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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and mixed-signal solutions for industrial, automotive, and infrastructure markets.

The X5329S8IZ-4.5A belongs to Renesas' CPU supervisor family designed to consolidate power monitoring, reset generation, and nonvolatile storage into a single IC - reducing system complexity and improving reliability in resource-constrained embedded platforms.

FAQ

What is the reset polarity and assertion behavior of the X5329S8IZ-4.5A?

The X5329S8IZ-4.5A features an active-high RESET/RESET output. It asserts HIGH during power-up (at ~1 V) for 100–280 ms and remains HIGH whenever VCC drops below the 4.5–4.75 V trip threshold. The signal stays asserted until VCC rises above VTRIP and stabilizes for ≥200 ms. This behavior is inherent to the X5329 variant and confirmed in the FN8132 datasheet Section 3 (PIN DESCRIPTION) and Figure 4 (RESET Output Timing).

Can the VTRIP voltage of the X5329S8IZ-4.5A be reprogrammed, and what is required?

Yes, the VTRIP voltage of the X5329S8IZ-4.5A can be reprogrammed to a higher value using a dedicated VP pulse sequence applied to SCK and SI pins while CS and WP are held HIGH. The procedure requires a 15–18 V programming voltage (VP), precise timing (tVPS/tVPH ≥1 µs, tP ≥1 µs), and stable VCC set to the desired new threshold. Full details are in FN8132 Rev 3.00 Pages 4–5 and Table on Page 16. The X5329S8IZ-4.5A supports this function per its X5329 family designation.

What EEPROM protection mechanisms does the X5329S8IZ-4.5A provide?

The X5329S8IZ-4.5A provides three-tiered EEPROM protection: (1) Power-up/down write inhibit circuitry, (2) Block Lock™ via nonvolatile BL0/BL1 bits (locking 0%, 25%, 50%, or 100% of the 32 Kbit array), and (3) In-Circuit Programmable ROM mode enabled by WPEN bit + grounded WP pin. These features prevent accidental writes during power transitions, restrict access to critical memory regions, and permanently secure factory-programmed data - all documented in FN8132 Pages 6–7 and Table 2.

What is the maximum SPI clock frequency supported by the X5329S8IZ-4.5A, and which modes are compatible?

The X5329S8IZ-4.5A supports SPI clock frequencies up to 2 MHz, with guaranteed timing compliance per AC specifications in FN8132 Rev 3.00 Page 12. It operates in SPI modes 0,0 (CPOL=0, CPHA=0) and 1,1 (CPOL=1, CPHA=1), where data is sampled on the first clock edge and shifted out on the opposite edge. All instructions, addresses, and data are transmitted MSB-first, and CS must remain LOW throughout each transaction - as specified in Sections 6 (SPI SERIAL MEMORY) and Table 1 (Instruction Set).

How does the X5329S8IZ-4.5A differ from the X5328S8IZ-4.5A in functionality and pinout?

The X5329S8IZ-4.5A and X5328S8IZ-4.5A share identical pinout, package (8-SOIC), EEPROM size (32 Kbit), VTRIP range (4.5–4.75 V), and operating temperature (−40°C to +85°C), but differ exclusively in reset polarity: X5329 asserts RESET/RESET active-high, while X5328 asserts it active-low. This distinction is explicitly defined in the BLOCK DIAGRAM (Page 1), PIN DESCRIPTION (Page 3), and ORDERING INFORMATION table (Page 2) of FN8132 Rev 3.00 - no other functional or electrical differences exist between these variants.