Renesas X5328S8IZ

Overview

X5328S8IZ from Renesas Electronics is a CPU supervisor IC integrating power-on reset control, supply voltage supervision, and 32Kbit SPI EEPROM in a single 8-lead SOIC package. It provides active-low RESET output with programmable 4.5–4.75 V trip threshold, operates from 4.5–5.5 V, consumes <1 µA standby current, and supports 2 MHz SPI interface for embedded microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5328S8IZ datasheet, X5328S8IZ pinout, X5328S8IZ application, or X5328S8IZ equivalent, this device serves as a system-level power integrity and configuration memory solution-particularly where industrial temperature range (–40°C to +85°C), reprogrammable VTRIP, Block Lock™ EEPROM protection, and RoHS-compliant Pb-free packaging are required.

Technical Context

The X5328S8IZ implements a dual-function architecture: its analog supervision block generates a precise, temperature-stable RESET signal that asserts below the programmed VTRIP (4.5–4.75 V) and remains active for 200 ms after VCC recovery; simultaneously, its SPI EEPROM subsystem uses Direct Write™ cells for 100,000 write cycles and 100-year data retention, organized as 4 K × 8 with page-write capability.

It features a configurable protection scheme via nonvolatile BL0/BL1 bits (0–100% array lock), WPEN-controlled in-circuit programmable ROM mode, and a volatile WEL latch requiring explicit WREN before writes-all coordinated through an 8-bit instruction set (READ, WRITE, WRSR, RDSR) synchronized to SCK rising/falling edges per SPI Mode 0/3.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA26+T and STM8AF6266TCY, the X5328S8IZ uniquely combines factory-set 4.5–4.75 V VTRIP with field reprogrammability, 32 Kbit EEPROM, and industrial temperature support-making it optimal for 5 V systems needing guaranteed hardware reset behavior and robust nonvolatile storage without MCU overhead.

Availability

X5328S8IZ is available at Aetrix Electronics and suitable for industrial automation, medical device certification, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for X5328S8IZ 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 SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The X5328/X5329 product line was designed specifically for embedded systems needing tightly integrated power supervision and nonvolatile memory-reducing board space, BOM count, and system-level reliability risk versus discrete supervisor + EEPROM implementations.

FAQ

What is the factory-programmed VTRIP voltage for X5328S8IZ?

The X5328S8IZ is factory-programmed with a VTRIP range of 4.5–4.75 V, optimized for 5 V supply systems. This threshold is reprogrammable using VP pulses applied to SCK and SI pins while holding CS and WP HIGH, enabling fine-tuning to match specific LDO dropout or system brownout requirements without hardware modification. The X5328S8IZ datasheet specifies tVPS, tVPH, and tP timing constraints for successful reprogramming.

Does X5328S8IZ support SPI Mode 1 or Mode 2?

No, the X5328S8IZ supports only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed by the FN8132 datasheet. Data is latched on the rising edge of SCK and output on the falling edge. Attempting Mode 1 (CPHA = 1) or Mode 2 (CPOL = 1, CPHA = 0) will result in incorrect opcode decoding or data corruption. The X5328S8IZ requires strict adherence to these two modes for reliable READ, WRITE, and WRSR operations.

How does the Block Lock™ protection work on X5328S8IZ?

Block Lock™ protection on the X5328S8IZ is controlled by nonvolatile BL0 and BL1 bits in the Status Register, programmed via the WRSR instruction. These bits define protected memory regions: BL1/BL0 = 00 (none), 01 ($0C00–$0FFF), 10 ($0800–$0FFF), or 11 (entire $0000–$0FFF array). Protected blocks remain readable but reject all write attempts-even with WREN issued-until BL bits are rewritten. The X5328S8IZ enforces this at the hardware level, independent of software state.

Can X5328S8IZ operate at 2.7 V?

No, the X5328S8IZ variant (marked X5328S8IZ-4.5A) is specified only for 4.5–5.5 V operation, as indicated in the Ordering Information table. While the X5328 family includes -2.7A variants (e.g., X5328S8IZ-2.7A), the X5328S8IZ part number itself corresponds exclusively to the 4.5–5.5 V version. Applying 2.7 V to X5328S8IZ will result in improper reset assertion, EEPROM read/write failure, and undefined behavior per the FN8132 Rev 3.00 datasheet.

What is the maximum write cycle time for X5328S8IZ EEPROM?

The typical write cycle time for the X5328S8IZ EEPROM is 5 ms, with a maximum of 10 ms as specified in the AC Characteristics table (tWC). This self-timed duration covers internal charge-pump operation and cell verification-no external delay is needed. The X5328S8IZ automatically clears the Write-In-Progress (WIP) bit in the Status Register upon completion, allowing polling via RDSR to confirm readiness before issuing subsequent commands.