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

Renesas X4325S8-2.7

Name: X4325S8-2.7
Brand: Renesas
SKU: X4325S8-2.7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X4325S8-2.7

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X4325S8-2.7.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

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Product details

Overview

X4325S8-2.7 from Xicor (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 32Kbit serial EEPROM in an 8-lead SOIC package. It features 2.7V–5.5V operation, 400kHz I²C interface, <1µA standby current (watchdog off), and reset assertion valid down to V_CC = 1V - used in microcontroller-based embedded systems requiring reliable power sequencing and nonvolatile configuration storage.

For engineers reviewing the X4325S8-2.7 datasheet, X4325S8-2.7 pinout, X4325S8-2.7 application, or X4325S8-2.7 equivalent, key selection criteria include programmable V_TRIP threshold (2.7V factory default), selectable watchdog timeout (200ms/600ms/1.4s), 64-byte page write capability, Block Lock protection granularity, and dual active-reset outputs (RESET and RESET).

Technical Context

The X4325S8-2.7 implements a dual-reset architecture with independent active-low (RESET) and active-high (RESET) outputs, both asserted during power-up, brownout, or watchdog timeout. Its low-voltage detection circuit uses an adjustable comparator with factory-set 2.7V trip point, reprogrammable via dedicated V_TRIP programming sequence using V_P on WP pin.

Watchdog functionality monitors SDA transitions while SCL is HIGH; timeout period is set by nonvolatile WD1/WD0 bits (200ms, 600ms, 1.4s, or disabled). EEPROM operates in 4K × 8-bit organization with self-timed 5ms typical write cycle, supported by hardware write protection via WP pin + WPEN bit and software-controlled Block Lock (BP2–BP0) for 64B–4KB segments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7V to 5.5V - supports single-supply operation across industrial and automotive-grade logic families.
Reset Threshold (V_TRIP)	Factory-set 2.7V, reprogrammable - enables precise brownout detection matching system MCU requirements.
I²C Interface Speed	400kHz - compatible with standard Fast-mode I²C controllers without timing margin concerns.
EEPROM Capacity	32Kbit (4K × 8) - stores bootloader parameters, calibration data, or device identity in space-constrained designs.
Standby Current	<1µA (watchdog off) - extends battery life in always-on monitoring nodes and portable equipment.
Power-On Reset Pulse Width	250ms minimum - ensures stable clock and power rail settling before MCU execution begins.
Watchdog Timeout Options	200ms / 600ms / 1.4s / disabled - configurable fault recovery timing without external components.

Pinout & Package

Package: 8-lead SOIC (JEDEC MS-012), 150 mil width, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (SOIC)	S0	Device select input - sets LSB of I²C slave address (A0); tied HIGH/LOW to configure multi-device bus addressing.
2 (SOIC)	S1	Device select input - sets MSB of I²C slave address (A1); enables up to four X4325S8-2.7 devices on same bus.
3 (SOIC)	RESET / RESET	Dual active-reset output - open-drain RESET (active-low) and push-pull RESET (active-high) provide flexible reset signaling to diverse MCU inputs.
4 (SOIC)	VSS	Ground reference - common return path for all internal circuits and I²C bus pull-ups.
5 (SOIC)	SDA	Serial data I/O - bidirectional, open-drain I²C data line; also serves as watchdog trigger input (falling edge while SCL=HIGH resets timer).
6 (SOIC)	SCL	Serial clock input - synchronous timing source for I²C read/write operations and watchdog sampling.
7 (SOIC)	WP	Write protect control - when HIGH + WPEN bit set, blocks all nonvolatile writes including control register and EEPROM array.
8 (SOIC)	VCC	Power supply input - powers all internal blocks; also used as reference during V_TRIP reprogramming sequence.

Key Features

Feature	Design Value
Programmable V_TRIP threshold	Adjustable from ~1.7V to >4.4V via nonvolatile programming - eliminates need for external resistor dividers or precision references.
Hardware + software write protection	Combines WP pin + WPEN bit + BP2–BP0 block lock - prevents accidental overwrites during firmware updates or field operation.
Dual-reset output polarity	Simultaneous active-low (open-drain) and active-high (push-pull) signals - interfaces directly with legacy and modern MCUs without level-shifting.
Self-timed EEPROM write	5ms typical internal write cycle with automatic completion detection - simplifies host firmware by removing fixed delay timing loops.
Watchdog restart via I²C bus activity	Falling edge on SDA while SCL is HIGH - enables watchdog servicing using standard I²C start condition, no dedicated GPIO required.

Applications

Industrial PLC Controller	Medical Infusion Pump
Use Scenario: Real-time monitoring of motor position, pressure sensors, and safety interlocks in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout detection at 2.7V, and watchdog timeout (600ms) to force safe shutdown if main MCU hangs. Use Value: Prevents unsafe actuator movement during undervoltage or software lockup; EEPROM stores last-known valve positions for graceful recovery after power restoration.	Use Scenario: Battery-powered infusion device delivering precise drug dosages with regulatory-required fault logging and calibration persistence. IC Role / Device Role / Timing Role: Dual-role supervisor: ensures MCU initialization only after stable 3.3V rail, and logs error codes to EEPROM upon watchdog-triggered reset. Use Value: Meets IEC 62304 Class C software safety requirements; 2.7V V_TRIP guarantees reset before Li-ion battery drops below safe operating voltage (~2.8V).
Automotive Body Control Module	Smart Energy Meter
Use Scenario: Centralized lighting, window, and mirror control unit exposed to wide temperature (-40°C to +125°C) and load-dump transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during cold-crank (V_CC < 2.7V) and generating watchdog pulse to recover from CAN communication faults. Use Value: Eliminates need for discrete reset IC + EEPROM + watchdog chip - reduces BOM count, PCB area, and qualification effort for AEC-Q100 Grade 2 compliance.	Use Scenario: Revenue-grade meter storing tariff schedules, tamper events, and accumulated kWh data across 15+ year lifetime. IC Role / Device Role / Timing Role: Nonvolatile memory manager with hardware write protection: WP pin tied HIGH during firmware update to prevent corruption of billing registers. Use Value: Block Lock (BP2–BP0) isolates critical billing data (first 512 bytes) from application code updates - satisfies ANSI C12.22 security requirements.

Industrial PLC Controller

Medical Infusion Pump

Use Scenario: Real-time monitoring of motor position, pressure sensors, and safety interlocks in a DIN-rail mounted controller.

IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout detection at 2.7V, and watchdog timeout (600ms) to force safe shutdown if main MCU hangs.

Use Value: Prevents unsafe actuator movement during undervoltage or software lockup; EEPROM stores last-known valve positions for graceful recovery after power restoration.

Use Scenario: Battery-powered infusion device delivering precise drug dosages with regulatory-required fault logging and calibration persistence.

IC Role / Device Role / Timing Role: Dual-role supervisor: ensures MCU initialization only after stable 3.3V rail, and logs error codes to EEPROM upon watchdog-triggered reset.

Use Value: Meets IEC 62304 Class C software safety requirements; 2.7V V_TRIP guarantees reset before Li-ion battery drops below safe operating voltage (~2.8V).

Automotive Body Control Module

Smart Energy Meter

Use Scenario: Centralized lighting, window, and mirror control unit exposed to wide temperature (-40°C to +125°C) and load-dump transients.

IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during cold-crank (V_CC < 2.7V) and generating watchdog pulse to recover from CAN communication faults.

Use Value: Eliminates need for discrete reset IC + EEPROM + watchdog chip - reduces BOM count, PCB area, and qualification effort for AEC-Q100 Grade 2 compliance.

Use Scenario: Revenue-grade meter storing tariff schedules, tamper events, and accumulated kWh data across 15+ year lifetime.

IC Role / Device Role / Timing Role: Nonvolatile memory manager with hardware write protection: WP pin tied HIGH during firmware update to prevent corruption of billing registers.

Use Value: Block Lock (BP2–BP0) isolates critical billing data (first 512 bytes) from application code updates - satisfies ANSI C12.22 security requirements.

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
MAX6361KA27+T	Fixed 2.7V reset threshold; no V_TRIP reprogramming; 16Kbit EEPROM; no dual-reset outputs.	Lacks adjustable brownout and active-high reset - requires external inverter for RESET compatibility.	Select when V_TRIP tuning is unnecessary and board space permits discrete reset buffering.
STM8AF6266TCY	8-bit automotive MCU with integrated 32K EEPROM and reset generator; requires firmware development; no standalone watchdog independence.	Replaces supervisory function with software-managed reset logic - increases validation scope and interrupt latency.	Select when system already uses STM8 platform and firmware resources exist to implement watchdog/state monitoring.

Compared with MAX6361KA27+T and STM8AF6266TCY, the X4325S8-2.7 delivers unique value through field-programmable V_TRIP, dual-polarity reset outputs, and hardware-enforced write protection - reducing design risk in safety-critical, long-lifecycle applications where component-level reliability is non-negotiable.

Availability

X4325S8-2.7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for X4325S8-2.7 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

Xicor was a fabless semiconductor company specializing in nonvolatile memory and power management ICs, acquired by Renesas Electronics in 2002.

The X4325S8-2.7 belongs to Xicor's CPU Supervisor family, designed to consolidate reset generation, voltage monitoring, watchdog safety, and configuration storage into a single IC for resource-constrained embedded systems.

FAQ

What is the factory-default V_TRIP threshold for the X4325S8-2.7?

The X4325S8-2.7 ships with a factory-set V_TRIP threshold of 2.7V, matching its suffix designation. This value is stored in nonvolatile circuitry and remains stable over temperature and time unless explicitly reprogrammed using the documented V_TRIP programming sequence involving VP on the WP pin and controlled V_CC application.

Does the X4325S8-2.7 support both active-low and active-high reset outputs simultaneously?

Yes, the X4325S8-2.7 provides two independent reset signals: an open-drain active-low RESET and a push-pull active-high RESET. Both are asserted concurrently during power-up, brownout, or watchdog timeout, enabling direct connection to MCUs requiring either polarity without external logic.

How does the watchdog timer in the X4325S8-2.7 get reset?

The X4325S8-2.7 watchdog timer is reset by a falling edge on the SDA pin while SCL is held HIGH - identical to an I²C start condition. This allows the host MCU to service the watchdog using standard I²C hardware, eliminating the need for dedicated GPIO toggling or timer interrupts.

Can the EEPROM in the X4325S8-2.7 be protected against accidental writes during power transitions?

Yes, the X4325S8-2.7 includes multiple layers of EEPROM protection: power-up/power-down detection disables writes below V_CC = 1V; WEL and RWEL volatile latches must be set before any write; and hardware write protection engages when WP and WPEN are both HIGH - preventing all nonvolatile writes until WP is pulled LOW.

What is the maximum write speed for the EEPROM in the X4325S8-2.7?

The X4325S8-2.7 supports 64-byte page writes with a typical internal write cycle time of 5ms per page. Because writes are self-timed and do not require host polling beyond acknowledge polling, effective throughput reaches ~12.8 KB/s when writing full pages consecutively, significantly faster than byte-by-byte operation.

X4325S8-2.7 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.62V

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

X4325S8-2.7 FAQ

1.How can I place an order for X4325S8-2.7 through Aetrix?

Please submit a Request for Quotation (RFQ) for X4325S8-2.7 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 X4325S8-2.7 reliable?

The price and inventory of X4325S8-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4325S8-2.7 is usually 5 days.

3.What payment methods are accepted for X4325S8-2.7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4325S8-2.7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X4325S8-2.7?

X4325S8-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X4325S8-2.7 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 X4325S8-2.7?

For technical support, including X4325S8-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4325S8-2.7 requirements.

6.How does Aetrix verify that X4325S8-2.7 is sourced from the original manufacturer or authorized distributors?

All X4325S8-2.7 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 X4325S8-2.7 meets industry standards.

7.What is the process for return or replacement of X4325S8-2.7?

All X4325S8-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4325S8-2.7, 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 X4325S8-2.7 part is unused and in its original packaging.

Return procedure for X4325S8-2.7:

1.Submit a request within 90 days.

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

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