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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Renesas X5325S8Z-4.5A

Name: X5325S8Z-4.5A
Brand: Renesas
SKU: X5325S8Z-4.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X5325S8Z-4.5A

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: X5325S8Z-4.5A.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

X5325S8Z-4.5A from Intersil is a CPU supervisor IC with integrated 32kbit SPI EEPROM, active-high reset output, 4.5–4.75V V_TRIP threshold, and programmable watchdog timer. It combines power-on reset control, low-voltage supervision, watchdog monitoring, and nonvolatile memory in an 8-lead SOIC package for embedded microcontroller systems requiring reliable boot integrity and configuration storage.

For engineers reviewing the X5325S8Z-4.5A datasheet, X5325S8Z-4.5A pinout, X5325S8Z-4.5A application, or X5325S8Z-4.5A equivalent, this device delivers verified reset timing (200ms t_PURST), reprogrammable V_TRIP, block-lock EEPROM protection, and SPI interface compatibility with industrial-grade temperature operation (0°C to +70°C).

Technical Context

The X5325S8Z-4.5A 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 (active-high) when V_CC drops below 4.5V (min) and holds it active for ≥200ms after V_CC recovers above V_TRIP.

Internally, it integrates three independent functional blocks: a precision voltage comparator with 20mV hysteresis for V_TRIP detection, a configurable watchdog timer with three timeout options (200ms/600ms/1.4s), and a 4K × 8-bit SPI EEPROM array featuring Block Lock™ protection and Direct Write™ cell technology (100k write cycles, 100-year retention).

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP Threshold	4.5V to 4.75V - factory-programmed reset trip point for 4.5–5.5V supply systems
Reset Output Polarity	Active-high (RESET) - directly interfaces with microcontrollers requiring high-asserted reset signals
EEPROM Capacity	32kbit (4K × 8) - sufficient for firmware versioning, calibration data, and system configuration storage
Watchdog Timeout Options	200ms / 600ms / 1.4s - selectable via nonvolatile WD0/WD1 bits; factory default disabled
Supply Voltage Range	4.5V to 5.5V - matches standard 5V logic rails without external regulation
Standby Current (WDT off)	<1µA at V_CC = 5.5V - enables ultra-low-power operation in battery-backed systems
SPI Clock Frequency	Up to 2MHz - supports fast read/write cycles compatible with common MCU SPI peripherals

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), body width 3.9mm, lead pitch 1.27mm.

Pin/Terminal	Circuit Role	Design Meaning
1 CS/WDI	Chip Select Input / Watchdog Input	LOW enables SPI communication; HIGH-to-LOW transition resets watchdog timer
2 SO	Serial Output	Push-pull output delivering read data MSB-first on falling SCK edge
3 WP	Write Protect	Controls in-circuit programmable ROM mode when WPEN bit is set; locks status register writes
4 VSS	Ground	Reference return path for all internal circuits and I/O pins
5 SI	Serial Input	Latches opcodes, addresses, and data on rising SCK edge; MSB-first protocol
6 SCK	Serial Clock	Master-generated clock synchronizing all SPI transactions (modes 0,0 and 1,1 supported)
7 RESET	Reset Output (Active-High)	Open-drain output asserted HIGH during power-up, brown-out, or watchdog timeout
8 VCC	Supply Voltage	4.5–5.5V nominal input powering all internal functions including EEPROM and reset circuitry

Key Features

Feature	Design Value
Reprogrammable V_TRIP	Voltage threshold adjustable via external programming sequence using VP (15–18V) on SCK/SI - enables custom brown-out detection without component change
Block Lock™ EEPROM Protection	Nonvolatile BL0/BL1 bits allow locking 0%, 25%, 50%, or 100% of 32kbit array - prevents accidental overwrites of critical calibration or security data
Dual-Mode Reset Flag	Volatile flag bit (FLB) set by SFLB/RFLB instructions - allows firmware to distinguish between watchdog timeout and supply-failure reset events
Low-Power Standby Operation	<1µA max current with watchdog disabled - extends battery life in always-on monitoring applications
Self-Timed EEPROM Writes	5ms typical page-write cycle time with automatic internal timing - eliminates need for external delay management in host firmware

Applications

Industrial PLC Controller	Medical Diagnostic Device
Use Scenario: Microcontroller-based controller managing I/O modules, communication gateways, and safety interlocks in factory automation. IC Role / Device Role / Timing Role: CPU supervisor ensuring clean boot sequence and EEPROM-stored configuration persistence across power cycles. Use Value: Prevents erratic behavior during brown-out conditions and preserves calibrated sensor offsets in nonvolatile memory with hardware-level write protection.	Use Scenario: Portable ultrasound or ECG unit requiring secure storage of calibration coefficients and user preferences. IC Role / Device Role / Timing Role: Active-high reset generator synchronized with 5V main rail and watchdog monitor for firmware execution integrity. Use Value: Guarantees deterministic startup before analog front-end initialization and protects stored medical calibration data from corruption via Block Lock™.
Smart Energy Meter	Automotive Body Control Module
Use Scenario: Revenue-grade meter with tamper detection, real-time clock, and firmware update capability. IC Role / Device Role / Timing Role: Supervisor providing V_TRIP-based reset and EEPROM storage for tariff tables, metering logs, and cryptographic keys. Use Value: Enables field-reprogrammable V_TRIP to match local grid voltage tolerances and ensures secure, lockable storage of billing-critical parameters.	Use Scenario: BCM managing door locks, lighting, and window controls in 12V automotive systems with 5V LDO-regulated logic rail. IC Role / Device Role / Timing Role: Reset supervisor interfacing with 5V domain MCU and storing vehicle-specific configuration (e.g., mirror position, lighting profiles). Use Value: Delivers 200ms power-up reset hold time meeting automotive cold-cranking requirements and safeguards EEPROM against unintended writes during transient load dumps.

Industrial PLC Controller

Medical Diagnostic Device

Use Scenario: Microcontroller-based controller managing I/O modules, communication gateways, and safety interlocks in factory automation.

IC Role / Device Role / Timing Role: CPU supervisor ensuring clean boot sequence and EEPROM-stored configuration persistence across power cycles.

Use Value: Prevents erratic behavior during brown-out conditions and preserves calibrated sensor offsets in nonvolatile memory with hardware-level write protection.

Use Scenario: Portable ultrasound or ECG unit requiring secure storage of calibration coefficients and user preferences.

IC Role / Device Role / Timing Role: Active-high reset generator synchronized with 5V main rail and watchdog monitor for firmware execution integrity.

Use Value: Guarantees deterministic startup before analog front-end initialization and protects stored medical calibration data from corruption via Block Lock™.

Smart Energy Meter

Automotive Body Control Module

Use Scenario: Revenue-grade meter with tamper detection, real-time clock, and firmware update capability.

IC Role / Device Role / Timing Role: Supervisor providing V_TRIP-based reset and EEPROM storage for tariff tables, metering logs, and cryptographic keys.

Use Value: Enables field-reprogrammable V_TRIP to match local grid voltage tolerances and ensures secure, lockable storage of billing-critical parameters.

Use Scenario: BCM managing door locks, lighting, and window controls in 12V automotive systems with 5V LDO-regulated logic rail.

IC Role / Device Role / Timing Role: Reset supervisor interfacing with 5V domain MCU and storing vehicle-specific configuration (e.g., mirror position, lighting profiles).

Use Value: Delivers 200ms power-up reset hold time meeting automotive cold-cranking requirements and safeguards EEPROM against unintended writes during transient load dumps.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361KA29+T	Fixed 2.93V reset threshold; no V_TRIP reprogramming; 16kbit EEPROM; 3-pin SOT23-6 package	Lacks configurable watchdog timeout and block-lock protection; suited for space-constrained, single-threshold designs	Select when board area is critical and V_TRIP flexibility is unnecessary
STM8AF6266TCY	Integrated 8-bit MCU with 32KB Flash, 2KB RAM, and hardware watchdog; no dedicated EEPROM; requires external SPI EEPROM	Offers full programmability but increases BOM count and firmware development effort versus single-chip solution	Choose when system requires custom reset logic sequencing or runtime adaptability beyond fixed supervisor functions

Compared with MAX6361KA29+T and STM8AF6266TCY, the X5325S8Z-4.5A uniquely combines factory-set 4.5V reset, reprogrammable V_TRIP, and hardware-block-locked 32kbit EEPROM in one SOIC-8 package-reducing component count while enabling field-tunable brown-out response and secure configuration storage.

Availability

X5325S8Z-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for X5325S8Z-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

Intersil (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The X5325 product line was designed to integrate supervisory functions and nonvolatile memory into a single package for microcontroller-based systems needing robust power sequencing, fault monitoring, and secure configuration storage.

FAQ

What is the reset output polarity of the X5325S8Z-4.5A?

The X5325S8Z-4.5A features an active-high RESET output, distinct from the active-low RESET variant used in the X5323 series. This allows direct connection to microcontrollers requiring high-asserted reset signals without external inversion logic, simplifying PCB layout and reducing component count in 5V systems.

Can the V_TRIP threshold of the X5325S8Z-4.5A be adjusted after manufacturing?

Yes, the X5325S8Z-4.5A supports field reprogramming of its V_TRIP threshold using a defined sequence involving VP (15–18V) applied to SCK and SI pins. This enables precise tuning to match application-specific brown-out requirements without replacing the component, provided the new target voltage exceeds the current setting.

How does the watchdog timer in the X5325S8Z-4.5A operate and what are its timeout options?

The X5325S8Z-4.5A watchdog timer monitors the CS/WDI pin for HIGH-to-LOW transitions and triggers RESET if none occur within the selected interval. Timeout options are 200ms, 600ms, or 1.4s, configured via nonvolatile WD0/WD1 bits in the status register. The timer is factory-disabled (WD1=1, WD0=1) and must be explicitly enabled.

What EEPROM protection mechanisms does the X5325S8Z-4.5A provide?

The X5325S8Z-4.5A implements Block Lock™ protection controlled by nonvolatile BL0/BL1 bits, allowing hardware-enforced write protection of 0%, 25%, 50%, or 100% of the 32kbit array. Additionally, the WP pin combined with the WPEN bit enables in-circuit programmable ROM mode, preventing further status register writes once configured.

Is the X5325S8Z-4.5A compatible with standard SPI interfaces?

Yes, the X5325S8Z-4.5A supports SPI modes 0,0 and 1,1 with up to 2MHz clock frequency, MSB-first data transfer, and standard instruction set (READ, WRITE, WREN, RDSR, etc.). It interfaces directly with common microcontroller SPI peripherals without protocol translation, and includes built-in write enable latch and status register polling for robust transaction control.

X5325S8Z-4.5A Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.63V

Output:: Open Drain or Open Collector

Reset:: Active High

Reset Timeout:: 100ms Minimum

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

X5325S8Z-4.5A FAQ

1.How can I place an order for X5325S8Z-4.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for X5325S8Z-4.5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for X5325S8Z-4.5A reliable?

The price and inventory of X5325S8Z-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5325S8Z-4.5A is usually 5 days.

3.What payment methods are accepted for X5325S8Z-4.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5325S8Z-4.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X5325S8Z-4.5A?

X5325S8Z-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X5325S8Z-4.5A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for X5325S8Z-4.5A?

For technical support, including X5325S8Z-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5325S8Z-4.5A requirements.

6.How does Aetrix verify that X5325S8Z-4.5A is sourced from the original manufacturer or authorized distributors?

All X5325S8Z-4.5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X5325S8Z-4.5A meets industry standards.

7.What is the process for return or replacement of X5325S8Z-4.5A?

All X5325S8Z-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X5325S8Z-4.5A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The X5325S8Z-4.5A part is unused and in its original packaging.

Return procedure for X5325S8Z-4.5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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