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

Renesas X40431S14-C

Name: X40431S14-C
Brand: Renesas
SKU: X40431S14-C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X40431S14-C

Manufacturer:: Renesas

Category:: Supervisors

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: X40431S14-C.pdf

Description:: IC SUPERVISOR 3 CHANNEL 14SOIC

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Product details

Overview

X40431S14-C from Xicor (now part of Renesas) is a triple-voltage CPU supervisor IC with integrated 4Kbit EEPROM, watchdog timer, and manual reset input-designed for embedded systems requiring coordinated power-up sequencing, brownout protection, and nonvolatile configuration storage. It monitors V_CC, V2MON, and V3MON at factory-programmed thresholds (4.55–4.65 V, 2.85–2.95 V, and 1.65–1.75 V respectively), asserts active-low RESET and WDO outputs, and operates from 2.7 V to 5.5 V with 25 µA standby current (watchdog enabled).

For engineers reviewing the X40431S14-C datasheet, X40431S14-C pinout, X40431S14-C application, or X40431S14-C equivalent, this device serves as a system-level power integrity and firmware resilience component in network infrastructure, industrial controllers, and server platforms where multi-rail voltage supervision and tamper-resistant EEPROM are required.

Technical Context

The X40431S14-C implements independent comparator-based monitoring for three voltage rails: V_CC (V1MON), V2MON, and V3MON-with dedicated open-drain fail outputs (LOWLINE, V2FAIL, V3FAIL) and programmable reset timeout (50/200/400/800 ms). Its watchdog logic responds to I²C bus activity on SDA/SCL, supporting 25 ms, 200 ms, or 1.4 s timeouts-or disabled state.

It integrates a 4Kbit (512 × 8) serial EEPROM with Block Lock™ write protection, 400 kHz I²C-compatible 2-wire interface, 5 ms typical byte-write cycle, and Direct Write™ memory cells rated for ≥100,000 endurance cycles and ≥100 years data retention. Thresholds for VTRIP2 and VTRIP3 are reprogrammable via high-voltage sequence on WDO.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 5.5 V - supports operation across standard logic supply rails without external regulation.
VTRIP1 Range	4.55–4.65 V - factory-set threshold for primary supply (V_CC) brownout detection and power-on reset assertion.
VTRIP2 Range	2.85–2.95 V - factory-set threshold for secondary supply (V2MON) monitoring, e.g., 3.0 V rail.
VTRIP3 Range	1.65–1.75 V - factory-set threshold for tertiary supply (V3MON) monitoring, e.g., 1.8 V core rail.
Standby Current	25 µA typical (watchdog enabled) - enables low-power system supervision during sleep modes.
I²C Speed	400 kHz - compatible with standard Fast-mode I²C buses for EEPROM access and register configuration.
EEPROM Endurance	≥100,000 write cycles - ensures reliable logging, calibration storage, or boot configuration updates over product lifetime.
Reset Timeout Options	50 ms / 200 ms (default) / 400 ms / 800 ms - selectable via nonvolatile control bits to match processor startup timing requirements.

Pinout & Package

Package: 14-lead SOIC (Small Outline Integrated Circuit) and TSSOP (Thin Shrink Small Outline Package), both RoHS-compliant and pin-compatible.

Pin/Terminal	Circuit Role	Design Meaning
1 V2FAIL	Open-drain voltage fail output	Asserts LOW when V2MON falls below VTRIP2; used for early warning or OR'd with RESET for system halt.
2 V2MON	Secondary voltage monitor input	Accepts direct connection to 3.0 V rail or resistor-divided unregulated supply; comparator powered by V2MON itself.
3 LOWLINE	Early V_CC fail indicator	CMOS output that goes LOW before RESET-enables preemptive shutdown or status logging prior to full reset.
4 NC	No connect	Not bonded; must remain unconnected per design.
5 MR	Debounced manual reset input	Pull LOW to initiate system reset; internal debounce eliminates need for external RC filter.
6 RESET	Active-low open-drain reset output	Drives microcontroller / FPGA reset line; remains asserted until V_CC exceeds VTRIP1 and t_PURST elapses.
7 V_SS	Ground reference	Primary return path for all analog comparators, digital logic, and EEPROM circuitry.
8 SDA	Bidirectional I²C data line	Open-drain interface for EEPROM read/write and control register access; requires external pull-up.
9 SCL	I²C clock input	Master-generated clock synchronizing all serial transfers; no internal clock generation.
10 WP	Hardware write protect input	HIGH disables all writes-including EEPROM, control registers, and VTRIP programming-to prevent accidental corruption.
11 V3MON	Tertiary voltage monitor input	Monitors third rail (e.g., 1.8 V); comparator powered directly by V3MON-functional even if V_CC = 0.
12 V3FAIL	Open-drain tertiary fail output	Asserts LOW when V3MON < VTRIP3; supports independent interrupt or cascaded reset logic.
13 WDO	Watchdog timeout output	Active-low open-drain signal asserting on watchdog expiration; can drive reset generator or fault latch.
14 V_CC	Main supply input	Power source for digital logic, EEPROM controller, and V1MON comparator; powers internal reset generator.

Key Features

Feature	Design Value
Triple independent voltage supervision	Simultaneous monitoring of V_CC, V2MON, and V3MON with separate fail outputs-eliminates need for three discrete supervisors and reduces BOM count.
Reprogrammable VTRIP thresholds	VTRIP2 and VTRIP3 can be adjusted in-system using high-voltage programming sequence on WDO-enables field calibration without hardware change.
Integrated 4Kbit EEPROM with Block Lock™	16-byte page write mode and software/hardware write protection-secures boot parameters, MAC addresses, or calibration data against unintended overwrite.
Selectable watchdog timeout	25 ms / 200 ms / 1.4 s options set via nonvolatile control bits-matches diverse MCU instruction throughput and recovery latency requirements.
Debounced manual reset input	Internal RC filtering on MR pin removes switch bounce-removes need for external debounce components and saves PCB area.
Fault Detection Register (FDR)	Volatile 8-bit register (address 0xFF) reporting root cause of last reset (LV1F/LV2F/LV3F/WDF/MRF)-enables automated diagnostics and failure mode analysis.

Applications

Network Router Power Management	Industrial PLC Voltage Monitoring
Use Scenario: A dual-core network router uses separate 5 V, 3.3 V, and 1.8 V rails for CPU, PHY, and DDR interface; brownout on any rail must trigger immediate controlled shutdown. IC Role / Device Role / Timing Role: X40431S14-C acts as centralized power supervisor-asserting RESET on V_CC collapse, V2FAIL on 3.3 V droop, and V3FAIL on 1.8 V sag, while logging fault cause in FDR. Use Value: Prevents corrupted packet forwarding or flash writes during undervoltage, reducing field failures and enabling post-mortem root-cause analysis via FDR read.	Use Scenario: An industrial programmable logic controller monitors 24 V DC input, 5 V logic, and 3.3 V I/O rail; voltage deviations must trigger alarm before safety-critical outputs deactivate. IC Role / Device Role / Timing Role: X40431S14-C functions as real-time voltage integrity monitor-using LOWLINE for early warning, V2FAIL for 5 V fault, and V3FAIL for 3.3 V fault, feeding interrupts to main controller. Use Value: Enables predictive maintenance alerts and graceful I/O shutdown sequences instead of abrupt lockup, meeting IEC 61508 functional safety timing constraints.
Server Baseboard Management	Embedded Storage Controller
Use Scenario: A rack-mount server baseboard manages 12 V, 5 V, and 3.3 V supplies for CPU, memory, and peripherals; EEPROM stores SMBIOS data and thermal calibration offsets. IC Role / Device Role / Timing Role: X40431S14-C provides coordinated power-on reset, brownout reset, and secure nonvolatile storage-RESET holds CPU until all rails stabilize, EEPROM retains configuration across hot-swap events. Use Value: Ensures deterministic boot behavior and preserves critical firmware metadata without external SPI flash or backup battery.	Use Scenario: A SAS/SATA storage controller board uses 5 V, 3.3 V, and 1.2 V rails; EEPROM stores vendor-specific drive initialization tables and error correction parameters. IC Role / Device Role / Timing Role: X40431S14-C serves as combined supervisor and configuration store-V3MON monitors 1.2 V core, WP pin prevents runtime EEPROM corruption during firmware updates. Use Value: Guarantees data integrity during power transitions and eliminates risk of invalid drive initialization due to partial EEPROM writes.

Network Router Power Management

Industrial PLC Voltage Monitoring

Use Scenario: A dual-core network router uses separate 5 V, 3.3 V, and 1.8 V rails for CPU, PHY, and DDR interface; brownout on any rail must trigger immediate controlled shutdown.

IC Role / Device Role / Timing Role: X40431S14-C acts as centralized power supervisor-asserting RESET on V_CC collapse, V2FAIL on 3.3 V droop, and V3FAIL on 1.8 V sag, while logging fault cause in FDR.

Use Value: Prevents corrupted packet forwarding or flash writes during undervoltage, reducing field failures and enabling post-mortem root-cause analysis via FDR read.

Use Scenario: An industrial programmable logic controller monitors 24 V DC input, 5 V logic, and 3.3 V I/O rail; voltage deviations must trigger alarm before safety-critical outputs deactivate.

IC Role / Device Role / Timing Role: X40431S14-C functions as real-time voltage integrity monitor-using LOWLINE for early warning, V2FAIL for 5 V fault, and V3FAIL for 3.3 V fault, feeding interrupts to main controller.

Use Value: Enables predictive maintenance alerts and graceful I/O shutdown sequences instead of abrupt lockup, meeting IEC 61508 functional safety timing constraints.

Server Baseboard Management

Embedded Storage Controller

Use Scenario: A rack-mount server baseboard manages 12 V, 5 V, and 3.3 V supplies for CPU, memory, and peripherals; EEPROM stores SMBIOS data and thermal calibration offsets.

IC Role / Device Role / Timing Role: X40431S14-C provides coordinated power-on reset, brownout reset, and secure nonvolatile storage-RESET holds CPU until all rails stabilize, EEPROM retains configuration across hot-swap events.

Use Value: Ensures deterministic boot behavior and preserves critical firmware metadata without external SPI flash or backup battery.

Use Scenario: A SAS/SATA storage controller board uses 5 V, 3.3 V, and 1.2 V rails; EEPROM stores vendor-specific drive initialization tables and error correction parameters.

IC Role / Device Role / Timing Role: X40431S14-C serves as combined supervisor and configuration store-V3MON monitors 1.2 V core, WP pin prevents runtime EEPROM corruption during firmware updates.

Use Value: Guarantees data integrity during power transitions and eliminates risk of invalid drive initialization due to partial EEPROM writes.

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
MAX6816ESE+	Single-voltage supervisor (5 V only) with debounced MR and no EEPROM; 16-pin SOIC package.	Lacks triple monitoring, EEPROM, and watchdog-suitable only for simple 5 V-only systems without configuration storage needs.	Select when cost sensitivity outweighs feature requirements and system has external nonvolatile storage.
TPS3808G33DBVR	Dual-voltage supervisor (3.3 V + adjustable second rail) with watchdog and reset delay; no EEPROM; SOT-23-6 package.	Supports only two monitored rails and lacks integrated memory-requires external I²C EEPROM for configuration storage.	Choose for space-constrained designs needing compact dual-rail supervision but accepting added BOM complexity.

Compared with MAX6816ESE+ and TPS3808G33DBVR, the X40431S14-C uniquely consolidates triple-rail supervision, EEPROM, watchdog, and manual reset into one 14-pin package-reducing board area by ~40% and eliminating inter-component timing skew in multi-rail power sequencing.

Availability

X40431S14-C is available at Aetrix Electronics and suitable for communication equipment, industrial control systems, and computer servers requiring stable component supply, long-term lifecycle support, and guaranteed traceability for mission-critical deployments.

Supply support for X40431S14-C 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 2008. Its legacy products emphasize reliability, low-power operation, and system integration.

The X40431 series belongs to Xicor's CPU Supervisor family, designed specifically for embedded systems needing coordinated power-up sequencing, multi-rail voltage monitoring, and secure nonvolatile parameter storage in a single chip.

FAQ

What voltage thresholds are factory-programmed in the X40431S14-C?

The X40431S14-C ships with VTRIP1 = 4.55–4.65 V (for V_CC), VTRIP2 = 2.85–2.95 V (for V2MON), and VTRIP3 = 1.65–1.75 V (for V3MON). These values are laser-trimmed during test and remain stable over temperature and time unless reprogrammed using the high-voltage VTRIP programming sequence defined in the datasheet.

Can the X40431S14-C monitor voltages below 1.0 V?

No-the X40431S14-C is not specified to monitor voltages below 0.9 V. Its V3MON input supports down to 0.9 V per the "Monitor Voltages: 5V to 0.9V" specification, and VTRIP3 minimum setting is 0.95–1.05 V for X40434/35 variants-but the X40431S14-C variant has a fixed 1.65–1.75 V VTRIP3 range and cannot be programmed lower than 1.65 V.

How does the X40431S14-C handle power-up reset timing?

The X40431S14-C asserts RESET at power-on and holds it active until V_CC exceeds VTRIP1 and remains stable for the selected t_PURST delay (50/200/400/800 ms). This delay is set via nonvolatile PUP1/PUP0 bits in the Control Register and defaults to 200 ms. The timing ensures microcontrollers and FPGAs complete initialization before release.

Is the EEPROM in the X40431S14-C accessible during reset assertion?

No-the X40431S14-C blocks I²C access to the EEPROM during active RESET assertion to prevent data corruption. The device disables SDA/SCL response until RESET is deasserted and V_CC stabilizes above VTRIP1, ensuring safe EEPROM reads/writes only during valid operating conditions.

Does the X40431S14-C support I²C bus arbitration or multi-master operation?

No-the X40431S14-C operates strictly as an I²C slave device with fixed 7-bit address 0xA0 (write) / 0xA1 (read). It does not implement bus arbitration logic or clock stretching, and is intended for use on dedicated I²C segments controlled by a single master-typically the host microcontroller.

X40431S14-C Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 3

Voltage - Threshold:: 1.7V, 2.2V, 2.9V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: Adjustable/Selectable

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

X40431S14-C FAQ

1.How can I place an order for X40431S14-C through Aetrix?

Please submit a Request for Quotation (RFQ) for X40431S14-C 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 X40431S14-C reliable?

The price and inventory of X40431S14-C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X40431S14-C is usually 5 days.

3.What payment methods are accepted for X40431S14-C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X40431S14-C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40431S14-C?

X40431S14-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X40431S14-C 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 X40431S14-C?

For technical support, including X40431S14-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X40431S14-C requirements.

6.How does Aetrix verify that X40431S14-C is sourced from the original manufacturer or authorized distributors?

All X40431S14-C 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 X40431S14-C meets industry standards.

7.What is the process for return or replacement of X40431S14-C?

All X40431S14-C units undergo pre-shipment inspection (PSI). If there is an issue with X40431S14-C, 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 X40431S14-C part is unused and in its original packaging.

Return procedure for X40431S14-C:

1.Submit a request within 90 days.

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

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