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

Renesas X40430S14I-B

Name: X40430S14I-B
Brand: Renesas
SKU: X40430S14I-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X40430S14I-B

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X40430S14I-B.pdf

Description:: IC SUPERVISOR 3 CHANNEL 14SOIC

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Product details

Overview

X40430S14I-B from Xicor (now part of Renesas) is a triple-voltage CPU supervisor IC with integrated 4Kbit EEPROM, power-on reset, watchdog timer, and fault detection register. It monitors V_CC (V1), V2MON, and V3MON at factory-programmed thresholds (4.55–4.65 V, 2.85–2.95 V, 1.65–1.75 V), asserts RESET (active-HIGH), supports 400 kHz I²C interface, and operates from 2.7 V to 5.5 V - used in network storage controllers for reliable power sequencing and data integrity.

For engineers reviewing the X40430S14I-B datasheet, X40430S14I-B pinout, X40430S14I-B application, or X40430S14I-B equivalent, key selection criteria include triple independent voltage monitoring capability, programmable reset timeout (200 ms default), nonvolatile watchdog configuration, Block Lock™ EEPROM protection, and SOIC-14/TSSOP-14 package compatibility with industrial-grade temperature range (–40°C to +85°C).

Technical Context

The X40430S14I-B implements three independent comparator-based voltage monitors: V1 (V_CC) with reset assertion down to 1 V, V2MON powered internally (X40430 variant), and V3MON self-powered for true off-V_CC monitoring. Its watchdog logic responds to I²C bus activity (SDA/SCL transitions) and uses nonvolatile WD1/WD0 bits to select 25 ms, 200 ms, or 1.4 s timeout - disabled by default.

Reset generation combines power-on delay (t_PURST = 200 ms factory default), brownout detection, and debounced manual reset (MR). The fault detection register (FDR) provides volatile status bits (LV1F/LV2F/LV3F/WDF/MRF) to identify root cause of reset events, accessible via I²C address 0xFF with special preamble 1011.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP1	4.55–4.65 V: Factory-set V_CC monitor threshold for primary supply supervision and reset assertion.
V_TRIP2	2.85–2.95 V: Factory-set secondary voltage threshold for unregulated or auxiliary rail monitoring.
V_TRIP3	1.65–1.75 V: Factory-set tertiary voltage threshold for low-voltage core or I/O rail supervision.
t_PURST	200 ms (default): Programmable power-on reset timeout ensuring stable V_CC and oscillator before processor release.
Watchdog Interval	Disabled (factory default): Nonvolatile WD1/WD0 bits must be set to enable 25 ms / 200 ms / 1.4 s timeout.
I²C Interface	400 kHz max: Full-speed 2-wire serial interface compatible with standard I²C bus timing and addressing (slave ID A0h).
EEPROM Size	4 Kbit (512 × 8): Organized in 16-byte pages with 5 ms typical write cycle; Block Lock™ protects upper half (256 bytes) when BP = 1.
Operating Temp	–40°C to +85°C: Industrial-grade temperature range validated for embedded networking and process control environments.

Pinout & Package

Package: 14-lead SOIC (Small Outline Integrated Circuit) or TSSOP (Thin Shrink Small Outline Package), both RoHS-compliant and rated for industrial temperature operation.

Pin/Terminal	Circuit Role	Design Meaning
1 V2FAIL	Open-drain fail indicator	Asserts LOW when V2MON < V_TRIP2; no power-up delay - enables immediate power-fail interrupt signaling.
2 V2MON	Secondary voltage input	Monitors second supply rail; comparator powered from V2MON itself (X40430 architecture), enabling operation even if V_CC = 0.
3 LOWLINE	Early V_CC warning output	CMOS HIGH/LOW signal asserting earlier than RESET during V_CC brownout - no t_PURST delay for fast system response.
4 NC	No connect	Unbonded pin; must remain floating - no external connection permitted.
5 MR	Manual reset input	Debounced active-LOW input; initiates reset pulse lasting t_PURST after release - eliminates need for external RC debounce circuitry.
6 RESET	Active-HIGH reset output	X40430-specific CMOS output asserted HIGH during V_CC undervoltage or MR activation - directly drives reset inputs of most microcontrollers.
7 V_SS	Ground reference	Primary return path for all internal circuits and I²C interface - must be low-impedance connection to system ground plane.
8 SDA	Serial data bidirectional line	I²C data line with open-drain output; requires external pull-up; used for EEPROM read/write, watchdog restart, and register access.
9 SCL	Serial clock input	I²C clock line; controls timing of all serial transfers - master-generated, edge-triggered for START/STOP detection and data sampling.
10 WP	Hardware write protect	Active-HIGH input disabling all writes to EEPROM and registers; internal 10 MΩ pull-down ensures safe default state.
11 V3MON	Tertiary voltage input	Monitors third supply rail; comparator powered from V3MON - maintains supervision capability independent of V_CC.
12 V3FAIL	Open-drain fail indicator	Asserts LOW when V3MON < V_TRIP3; no power-up delay - supports early warning for critical low-voltage rails.
13 WDO	Watchdog timeout output	Open-drain active-LOW output signaling watchdog expiration - can drive external reset logic or interrupt controller.
14 V_CC	Supply voltage input	2.7–5.5 V main power rail; powers V1 monitor, logic core, and I²C interface - also serves as V1MON input.

Key Features

Feature	Design Value
Triple independent voltage monitoring	Simultaneous supervision of V_CC, V2MON, and V3MON with separate comparators and fail outputs - eliminates need for three discrete supervisors.
Reprogrammable trip thresholds	V_TRIP1/V_TRIP2/V_TRIP3 adjustable via high-voltage programming sequence on SDA/SCL - enables fine-tuning without hardware changes.
Block Lock™ EEPROM protection	Nonvolatile BP bit locks upper 256 bytes (100h–1FFh) against accidental writes - preserves critical boot code or calibration data.
Fault Detection Register (FDR)	Volatile 0xFF register captures root cause (LV1F/LV2F/LV3F/WDF/MRF) of last reset event - enables deterministic system diagnostics and recovery.
Low-power standby modes	6 µA typical (watchdog off) or 25 µA typical (watchdog on) - extends battery life in always-on monitoring applications.
Power-up/power-down write protection	Automatic hardware lock during V_CC transients - prevents EEPROM corruption during power sequencing or brownout conditions.

Applications

Network Storage Controllers	Routers & Switches
Use Scenario: Monitoring 5 V main, 3.3 V I/O, and 1.8 V core rails in RAID controller boards during power-up and thermal stress. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing synchronized reset release, early brownout warning (LOWLINE), and EEPROM-stored configuration backup. Use Value: Prevents corrupted FPGA configuration loads and ensures deterministic boot sequence across varying input voltage tolerances.	Use Scenario: Supervising PoE-powered switch ASICs where 48 V DC-DC outputs generate 3.3 V, 2.5 V, and 1.2 V rails. IC Role / Device Role / Timing Role: Independent V2MON/V3MON monitoring of auxiliary supplies with fail outputs routed to ASIC interrupt pins. Use Value: Enables graceful shutdown and logging prior to complete power loss - improves MTBF in carrier-class equipment.
Industrial Process Controllers	Embedded Computer Systems
Use Scenario: Securing PLC backplane power integrity across 24 V field bus, 5 V logic, and 3.3 V communication interfaces. IC Role / Device Role / Timing Role: Fault Detection Register (FDR) logging cause of reset events (e.g., LV2F = 1 indicates 5 V rail collapse) for maintenance diagnostics. Use Value: Reduces mean time to repair (MTTR) by eliminating guesswork in field failure analysis.	Use Scenario: Managing boot reliability in fanless industrial PCs using 12 V ATX-derived rails (5 V, 3.3 V, 1.8 V). IC Role / Device Role / Timing Role: Active-HIGH RESET output directly interfacing with Intel/AMD PCH reset inputs; EEPROM stores BIOS recovery keys. Use Value: Eliminates external reset generator and discrete EEPROM - reduces BOM count and PCB area by 3 components.

Network Storage Controllers

Routers & Switches

Use Scenario: Monitoring 5 V main, 3.3 V I/O, and 1.8 V core rails in RAID controller boards during power-up and thermal stress.

IC Role / Device Role / Timing Role: Triple-voltage supervisor providing synchronized reset release, early brownout warning (LOWLINE), and EEPROM-stored configuration backup.

Use Value: Prevents corrupted FPGA configuration loads and ensures deterministic boot sequence across varying input voltage tolerances.

Use Scenario: Supervising PoE-powered switch ASICs where 48 V DC-DC outputs generate 3.3 V, 2.5 V, and 1.2 V rails.

IC Role / Device Role / Timing Role: Independent V2MON/V3MON monitoring of auxiliary supplies with fail outputs routed to ASIC interrupt pins.

Use Value: Enables graceful shutdown and logging prior to complete power loss - improves MTBF in carrier-class equipment.

Industrial Process Controllers

Embedded Computer Systems

Use Scenario: Securing PLC backplane power integrity across 24 V field bus, 5 V logic, and 3.3 V communication interfaces.

IC Role / Device Role / Timing Role: Fault Detection Register (FDR) logging cause of reset events (e.g., LV2F = 1 indicates 5 V rail collapse) for maintenance diagnostics.

Use Value: Reduces mean time to repair (MTTR) by eliminating guesswork in field failure analysis.

Use Scenario: Managing boot reliability in fanless industrial PCs using 12 V ATX-derived rails (5 V, 3.3 V, 1.8 V).

IC Role / Device Role / Timing Role: Active-HIGH RESET output directly interfacing with Intel/AMD PCH reset inputs; EEPROM stores BIOS recovery keys.

Use Value: Eliminates external reset generator and discrete EEPROM - reduces BOM count and PCB area by 3 components.

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	Single-voltage supervisor (2.93 V only); no V2MON/V3MON; 256-byte EEPROM; no programmable t_PURST or watchdog.	Limited to single-rail systems; lacks fault isolation capability for multi-supply designs.	Select only when supervising one critical rail and board space constraints prohibit triple-monitor solutions.
TPS3808G33DBVR	Dual-voltage supervisor (3.3 V + adjustable second threshold); no EEPROM; no FDR; watchdog-only (no reset timeout programming).	Requires external EEPROM for configuration storage; cannot log reset cause or support multi-rail fail alerts.	Choose when cost sensitivity outweighs diagnostic capability and EEPROM integration is unnecessary.

Compared with MAX6361KA29+T and TPS3808G33DBVR, the X40430S14I-B uniquely integrates triple independent voltage monitoring, programmable reset timing, nonvolatile watchdog control, and Block Lock™ EEPROM - delivering higher system-level reliability and reduced component count in multi-rail embedded platforms.

Availability

X40430S14I-B is available at Aetrix Electronics and suitable for network storage, industrial process control, and embedded computer systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for X40430S14I-B 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 X40430 series belongs to Xicor's CPU Supervisor with EEPROM product line, designed specifically for embedded systems needing consolidated power monitoring, reset control, and secure configuration storage in a single IC.

FAQ

What is the factory-default reset timeout (t_PURST) for the X40430S14I-B?

The X40430S14I-B ships with t_PURST = 200 ms as the factory-default power-on reset timeout. This value is stored in nonvolatile PUP1/PUP0 bits and can be reprogrammed to 50 ms, 400 ms, or 800 ms using the Control Register at address 1FFh. The X40430S14I-B requires a three-step write sequence (02H → 06H → new value) to modify this setting, and the change persists across power cycles.

Does the X40430S14I-B support reprogramming of its voltage trip thresholds?

Yes, the X40430S14I-B supports reprogramming of V_TRIP1, V_TRIP2, and V_TRIP3 thresholds using a high-voltage programming sequence applied to the WDO pin while issuing specific I²C commands. Thresholds can be increased directly or decreased after a reset procedure. The X40430S14I-B datasheet specifies exact voltage ranges and timing (e.g., V_p > 10 V) required for successful programming without corrupting EEPROM contents.

How does the X40430S14I-B handle EEPROM write protection?

The X40430S14I-B implements dual-layer EEPROM write protection: hardware WP pin (active-HIGH) disables all writes globally, and software Block Protect (BP) bit locks the upper 256 bytes (addresses 100h–1FFh). Both mechanisms operate independently - WP overrides BP, and BP remains effective even when WP is LOW. The X40430S14I-B retains BP state across power cycles as a nonvolatile setting.

What is the function of the LOWLINE pin on the X40430S14I-B?

The LOWLINE pin on the X40430S14I-B is a CMOS output that goes LOW when V_CC falls below V_TRIP1, providing an early brownout warning signal without the t_PURST delay applied to the RESET pin. This allows system firmware to initiate controlled shutdown or data save operations before full reset occurs. The X40430S14I-B LOWLINE output is active during both power-up and operational brownout conditions.

Can the X40430S14I-B monitor voltages when V_CC is absent?

Yes, the X40430S14I-B can monitor V2MON and V3MON independently of V_CC. Its V2MON comparator is powered from the V2MON pin itself (X40430 architecture), and V3MON comparator is powered from the V3MON pin - enabling supervision of secondary and tertiary rails even when V_CC = 0. The X40430S14I-B RESET output remains inactive in this state, but V2FAIL and V3FAIL signals remain functional for fail detection.

X40430S14I-B 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, 2.6V, 4.4V

Output:: Open Drain, Push-Pull

Reset:: Active High/Active Low

Reset Timeout:: Adjustable/Selectable

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

X40430S14I-B FAQ

1.How can I place an order for X40430S14I-B through Aetrix?

Please submit a Request for Quotation (RFQ) for X40430S14I-B 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 X40430S14I-B reliable?

The price and inventory of X40430S14I-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X40430S14I-B is usually 5 days.

3.What payment methods are accepted for X40430S14I-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X40430S14I-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40430S14I-B?

X40430S14I-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X40430S14I-B 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 X40430S14I-B?

For technical support, including X40430S14I-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X40430S14I-B requirements.

6.How does Aetrix verify that X40430S14I-B is sourced from the original manufacturer or authorized distributors?

All X40430S14I-B 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 X40430S14I-B meets industry standards.

7.What is the process for return or replacement of X40430S14I-B?

All X40430S14I-B units undergo pre-shipment inspection (PSI). If there is an issue with X40430S14I-B, 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 X40430S14I-B part is unused and in its original packaging.

Return procedure for X40430S14I-B:

1.Submit a request within 90 days.

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

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