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

Renesas X40431V14-C

Name: X40431V14-C
Brand: Renesas
SKU: X40431V14-C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X40431V14-C

Manufacturer:: Renesas

Category:: Supervisors

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: X40431V14-C.pdf

Description:: IC SUPERVISOR 3 CHANNEL 14TSSOP

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Product details

Overview

X40431V14-C from Xicor (now part of Renesas) is a triple-voltage supervisor IC with integrated 4Kbit EEPROM, watchdog timer, and manual reset input - designed for system-level power monitoring and nonvolatile configuration storage in embedded controllers. 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 supports I²C-compatible 2-wire interface up to 400 kHz.

For engineers reviewing the X40431V14-C datasheet, X40431V14-C pinout, X40431V14-C application, or X40431V14-C equivalent, this device serves as a single-chip solution for brownout detection, power-fail warning, watchdog supervision, and secure parameter storage - with programmable reset timeout (200 ms default), adjustable voltage thresholds, and Block Lock™ EEPROM protection.

Technical Context

The X40431V14-C implements three independent voltage comparators feeding into fault-detection logic, with separate open-drain V2FAIL and V3FAIL outputs and a CMOS LOWLINE signal for early V_CC undervoltage indication. Its watchdog timer restarts on valid I²C START/STOP sequences on SDA/SCL and offers selectable timeouts (25 ms, 200 ms, 1.4 s, or disabled) via nonvolatile control bits.

Supervision logic includes power-on reset generation with programmable t_PURST (50/200/400/800 ms), debounced manual reset input (MR), and a fault detection register (FDR) that latches cause-of-reset events (LV1F/LV2F/LV3F/WDF/MRF). The 4Kbit EEPROM uses Direct Write™ technology (100k write cycles, 100-year retention) and supports 16-byte page writes with 5 ms typical cycle time.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP1	4.55–4.65 V: Factory-set primary supply monitor threshold for V_CC, enabling reliable 5 V system reset assertion before brownout.
V_TRIP2	2.85–2.95 V: Factory-set secondary monitor threshold for V2MON, supporting 3.0 V rail supervision without external dividers.
V_TRIP3	1.65–1.75 V: Factory-set tertiary monitor threshold for V3MON, enabling direct 1.8 V rail monitoring with fail-safe signaling.
t_PURST	200 ms (default): Programmable power-up reset timeout ensuring stable oscillator and FPGA configuration before processor release.
Watchdog interval	200 ms (factory default): Nonvolatile watchdog timeout preventing runaway code in microcontrollers without software intervention.
I²C interface	400 kHz max: Full-speed 2-wire bus compatibility enabling fast EEPROM read/write and real-time status register access.
EEPROM endurance	100,000 write cycles: Guaranteed minimum reprogramming cycles for critical calibration or configuration data storage.
Standby current	6 µA (watchdog off): Ultra-low quiescent current preserving battery life in always-on supervisory applications.

Pinout & Package

Package: 14-lead SOIC (150 mil width) and TSSOP - RoHS-compliant, surface-mount compatible, with 1.27 mm pitch and standard JEDEC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 V2FAIL	Open-drain voltage fail output	Asserts LOW when V2MON falls below V_TRIP2; used for power-fail interrupt or OR-ed reset extension - no internal delay.
2 V2MON	Secondary voltage monitor input	Accepts 0.9–4.75 V input; comparator powered by V2MON itself (X40431), enabling monitoring even if V_CC fails.
3 LOWLINE	Early V_CC undervoltage indicator	CMOS output goes LOW immediately upon V_CC < V_TRIP1; no t_PURST delay - ideal for preemptive shutdown sequencing.
4 NC	No-connect terminal	Not bonded internally; must be left unconnected or tied to ground per layout best practices.
5 MR	Debounced manual reset input	Active-low pushbutton interface; internal debounce eliminates external RC network and reduces BOM count.
6 RESET	Active-low open-drain reset output	Drives system reset line LOW during V_CC brownout, MR assertion, or watchdog timeout - requires external pull-up.
7 V_SS	Ground reference	Primary return path for all analog comparators, digital logic, and EEPROM core - must be low-impedance connection.
8 SDA	Serial data bidirectional I²C line	Open-drain interface for EEPROM read/write, control register access, and watchdog restart - requires pull-up resistor.
9 SCL	Serial clock input	Master-generated clock synchronizing all I²C transactions; timing-critical for 400 kHz operation and watchdog restart validity.
10 WP	Hardware write protect input	HIGH disables all EEPROM and register writes - internal 10 MΩ pull-down ensures safe default state at power-up.
11 V3MON	Tertiary voltage monitor input	Accepts 0.9–4.75 V; comparator powered by V3MON pin - enables independent 1.8 V rail monitoring with no V_CC dependency.
12 V3FAIL	Open-drain tertiary fail output	Asserts LOW when V3MON < V_TRIP3; provides dedicated power-fail alert for lowest-voltage domain without shared logic.
13 WDO	Watchdog timeout output	Active-low open-drain signal indicating microcontroller lockup - can drive reset generator or system interrupt controller.
14 V_CC	Supply voltage input	2.7–5.5 V operating range powers internal logic, EEPROM, and V_TRIP1 comparator - also supplies RESET generation circuitry.

Key Features

Feature	Design Value
Triple independent voltage monitoring	Simultaneous supervision of V_CC, V2MON, and V3MON with separate fail outputs - eliminates need for three discrete supervisors and saves >25 mm² PCB area.
Reprogrammable trip thresholds	V_TRIP1/V_TRIP2/V_TRIP3 can be adjusted via high-voltage programming sequence on WDO pin - enables field calibration without hardware change.
Block Lock™ EEPROM protection	Nonvolatile BP bit locks upper 256 bytes (half-array) against accidental overwrite - secures boot parameters and security keys across power cycles.
Low-power standby modes	6 µA (watchdog off) or 25 µA (watchdog on) quiescent current - extends battery life in portable or energy-harvesting systems by >3× vs. legacy supervisors.
Fault Detection Register (FDR)	Volatile 8-bit register (address 0xFF) captures root cause of last reset event (LV1F/LV2F/LV3F/WDF/MRF) - enables deterministic system diagnostics without external logging.
Power-on reset with configurable delay	t_PURST set via PUP1/PUP0 bits (50/200/400/800 ms) - matches diverse processor startup requirements from ASICs to ARM Cortex-M cores.

Applications

Communications Infrastructure	Industrial Process Control
Use Scenario: Monitoring 5 V main, 3.3 V I/O, and 1.8 V core rails in enterprise Ethernet switches during thermal stress testing. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting RESET on any rail collapse while logging fault source via FDR for automated failure analysis. Use Value: Prevents silent data corruption during partial power loss and enables post-mortem diagnosis without adding debug interfaces or external logic.	Use Scenario: Securing firmware update parameters and calibration coefficients in programmable logic controllers (PLCs) deployed in hazardous environments. IC Role / Device Role / Timing Role: EEPROM + supervisor combo storing signed configuration data with hardware write protection (WP pin) and brownout-safe write sequencing. Use Value: Eliminates risk of corrupted updates during grid voltage sags - Block Lock™ prevents overwrites during transient conditions.
Network Storage Arrays	Embedded Computing Platforms
Use Scenario: Detecting early voltage degradation across redundant 12 V, 5 V, and 3.3 V power modules in NAS enclosures before HDD spin-up failure. IC Role / Device Role / Timing Role: Using V2FAIL/V3FAIL outputs to trigger predictive fan speed ramp-up and log warnings via I²C before full system shutdown. Use Value: Extends storage subsystem uptime by converting voltage margin erosion into actionable maintenance alerts - no additional sensors required.	Use Scenario: Enabling secure boot in industrial gateways by validating cryptographic keys stored in protected EEPROM pages before releasing CPU from reset. IC Role / Device Role / Timing Role: Supervisor holding RESET until V_CC stabilizes, then allowing secure bootloader to authenticate keys from Block Lock™-protected memory region. Use Value: Achieves hardware-rooted trust chain with zero added components - integrates key storage and power integrity enforcement in one die.

Communications Infrastructure

Industrial Process Control

Use Scenario: Monitoring 5 V main, 3.3 V I/O, and 1.8 V core rails in enterprise Ethernet switches during thermal stress testing.

IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting RESET on any rail collapse while logging fault source via FDR for automated failure analysis.

Use Value: Prevents silent data corruption during partial power loss and enables post-mortem diagnosis without adding debug interfaces or external logic.

Use Scenario: Securing firmware update parameters and calibration coefficients in programmable logic controllers (PLCs) deployed in hazardous environments.

IC Role / Device Role / Timing Role: EEPROM + supervisor combo storing signed configuration data with hardware write protection (WP pin) and brownout-safe write sequencing.

Use Value: Eliminates risk of corrupted updates during grid voltage sags - Block Lock™ prevents overwrites during transient conditions.

Network Storage Arrays

Embedded Computing Platforms

Use Scenario: Detecting early voltage degradation across redundant 12 V, 5 V, and 3.3 V power modules in NAS enclosures before HDD spin-up failure.

IC Role / Device Role / Timing Role: Using V2FAIL/V3FAIL outputs to trigger predictive fan speed ramp-up and log warnings via I²C before full system shutdown.

Use Value: Extends storage subsystem uptime by converting voltage margin erosion into actionable maintenance alerts - no additional sensors required.

Use Scenario: Enabling secure boot in industrial gateways by validating cryptographic keys stored in protected EEPROM pages before releasing CPU from reset.

IC Role / Device Role / Timing Role: Supervisor holding RESET until V_CC stabilizes, then allowing secure bootloader to authenticate keys from Block Lock™-protected memory region.

Use Value: Achieves hardware-rooted trust chain with zero added components - integrates key storage and power integrity enforcement in one die.

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-voltage supervisor with EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6816ESE+	Single-supply supervisor only (no V2MON/V3MON); 256-byte EEPROM; no programmable thresholds.	Lacks multi-rail monitoring and threshold adjustability - suitable only for basic 5 V reset + small config storage.	Select only if system has ≤2 rails and does not require field-trimmed trip points or fault-source diagnostics.
TPS3808G33DBVR	Dual-voltage supervisor (V1/V2) with adjustable thresholds; no EEPROM; no manual reset input; different package (SOT-23-6).	Requires external EEPROM and MR circuitry - increases board area and component count for same functionality.	Choose when cost-per-function is prioritized over integration and diagnostics - but expect +3 BOM items and +15 mm² layout penalty.

Compared with MAX6816ESE+ and TPS3808G33DBVR, the X40431V14-C delivers full triple-rail supervision, field-adjustable thresholds, integrated 4Kbit EEPROM with hardware write protection, and fault-source visibility - reducing total system component count by ≥4 and eliminating external timing/passive components required by alternatives.

Availability

X40431V14-C is available at Aetrix Electronics and suitable for communications infrastructure, industrial process control, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for X40431V14-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 high-reliability, low-power, and system-integration features.

The X40431V14-C belongs to Xicor's CPU Supervisor family, designed specifically to consolidate power monitoring, reset control, and secure configuration storage into a single IC for space-constrained, mission-critical embedded systems.

FAQ

What is the factory-default V_TRIP1 setting for X40431V14-C?

The X40431V14-C ships with V_TRIP1 factory-programmed to 4.55–4.65 V, optimized for reliable 5 V system supervision. This threshold is stored in nonvolatile memory and remains stable over temperature and time unless reprogrammed using the high-voltage V_TRIP adjustment sequence documented in the datasheet. The X40431V14-C maintains this value across its full operating life without drift.

Can X40431V14-C monitor voltages below 1.0 V?

No - the X40431V14-C supports V2MON and V3MON inputs from 0.9 V to 4.75 V, but its lowest factory-programmed V_TRIP3 is 1.65–1.75 V (for 1.8 V rail monitoring). While the input range includes 0.9 V, the internal comparator architecture and trip-point resolution are not specified for sub-1.0 V operation. For 1.2 V or 0.9 V rails, the X40434/X40435 variants (with 0.95–1.05 V V_TRIP3) are recommended instead of the X40431V14-C.

How does the Block Lock™ protection work on X40431V14-C EEPROM?

The X40431V14-C implements Block Lock™ via a nonvolatile BP bit in its control register: when BP = 1, the upper 256 bytes (addresses 0x100–0x1FF) are write-protected; when BP = 0, the entire 4Kbit array is writable. Protection is enforced at the hardware level - writes to locked regions are ignored and generate no acknowledge. This mechanism secures boot parameters in the X40431V14-C without software overhead or external logic.

Is X40431V14-C pin-compatible with other members of the X4043x family?

Yes - the X40431V14-C shares identical 14-pin SOIC/TSSOP pinout and electrical interface with X40430, X40434, and X40435. However, functional differences exist: X40430/X40431 use V2MON-powered comparators (enabling V2MON monitoring during V_CC failure), while X40434/X40435 use V_CC-powered comparators. Substituting X40431V14-C for X40434V14-C requires verifying V2MON independence is not needed in the target design.

What is the maximum write cycle time for EEPROM operations on X40431V14-C?

The X40431V14-C specifies a typical EEPROM write cycle time of 5 ms for byte or page writes, with no maximum limit stated in the datasheet. During this internal write period, the device ignores all I²C commands and places SDA in high-impedance state. Applications must enforce 5 ms minimum delay between write commands to ensure completion - verified by polling the acknowledge bit or using the built-in t_WC timing constraint in the X40431V14-C specification.

X40431V14-C Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm 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-TSSOP

X40431V14-C FAQ

1.How can I place an order for X40431V14-C through Aetrix?

Please submit a Request for Quotation (RFQ) for X40431V14-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 X40431V14-C reliable?

The price and inventory of X40431V14-C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X40431V14-C is usually 5 days.

3.What payment methods are accepted for X40431V14-C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X40431V14-C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40431V14-C?

X40431V14-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X40431V14-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 X40431V14-C?

For technical support, including X40431V14-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X40431V14-C requirements.

6.How does Aetrix verify that X40431V14-C is sourced from the original manufacturer or authorized distributors?

All X40431V14-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 X40431V14-C meets industry standards.

7.What is the process for return or replacement of X40431V14-C?

All X40431V14-C units undergo pre-shipment inspection (PSI). If there is an issue with X40431V14-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 X40431V14-C part is unused and in its original packaging.

Return procedure for X40431V14-C:

1.Submit a request within 90 days.

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

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