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

Renesas X40430S14I-A

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

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Part No.:: X40430S14I-A

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X40430S14I-A.pdf

Description:: IC SUPERVISOR 3 CHANNEL 14SOIC

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Product details

Overview

X40430S14I-A from Xicor (now part of Renesas) is a triple-voltage supervisor IC with integrated 4Kbit EEPROM, watchdog timer, and power-on reset logic. It monitors V_CC (V1), V2MON, and V3MON at factory-programmed thresholds (4.55–4.65V, 2.95–3.05V, 1.65–1.75V), asserts active-HIGH RESET, supports 400kHz I²C interface, and operates from 2.7V to 5.5V. It is used in network servers for coordinated power-fail detection and nonvolatile configuration storage.

For engineers reviewing the X40430S14I-A datasheet, X40430S14I-A pinout, X40430S14I-A application, or X40430S14I-A equivalent, key selection considerations include its triple independent voltage monitoring capability, programmable reset timeout (50/200/400/800ms), selectable watchdog intervals (25ms/200ms/1.4s/off), 4Kbit Block Lock™ EEPROM with 5ms write cycle, and 14-pin SOIC/TSSOP package compatibility.

Technical Context

The X40430S14I-A implements three independent voltage comparators - one referenced to V_CC (V1MON), one to V2MON (supplied by V2MON itself), and one to V3MON (self-supplied) - enabling simultaneous monitoring of regulated and unregulated rails without external components. Its fault detection register (FDR) provides volatile status bits (LV1F/LV2F/LV3F/WDF/MRF) to identify reset cause.

It integrates a nonvolatile control register (at 1FFh) managing watchdog timer period (WD1/WD0), power-up reset delay (PUP1/PUP0), and EEPROM block lock (BP), all configurable via I²C using a 3-step write sequence requiring WEL/RWEL latching. The EEPROM uses Direct Write™ cells rated for 100,000 write cycles and 100-year data retention.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP1	4.55–4.65V: Factory-set threshold for primary V_CC supervision; triggers active-HIGH RESET during brownout.
V_TRIP2	2.95–3.05V: Factory-set threshold for secondary voltage (V2MON); drives open-drain V2FAIL output.
V_TRIP3	1.65–1.75V: Factory-set threshold for tertiary voltage (V3MON); drives open-drain V3FAIL output.
t_PURST	200ms (factory default): Power-up reset timeout ensures stable V_CC and oscillator before processor release.
Watchdog interval	Disabled (factory default): Configurable to 25ms/200ms/1.4s via nonvolatile WD1/WD0 bits; restarts on I²C START-STOP sequence.
I²C speed	400kHz: Full-speed mode support enables fast EEPROM access and real-time status reads without bus contention.
EEPROM endurance	100,000 write cycles: Sufficient for firmware revision logging, calibration storage, and field-upgrade metadata in industrial systems.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 V2FAIL	Open-drain fail indicator	Asserts LOW when V2MON < V_TRIP2; used for early power-fail interrupt or OR'd with RESET for system halt.
2 V2MON	Secondary voltage input	Direct connection point for 3.0V rail monitoring; comparator powered by V2MON itself (X40430/X40431).
3 LOWLINE	Early V_CC warning output	CMOS HIGH/LOW signal asserting earlier than RESET; no t_PURST delay - ideal for preemptive shutdown sequencing.
4 NC	No connect	Unbonded pin; must remain floating per datasheet - no routing or termination required.
5 MR	Manual reset input	Debounced active-LOW input; initiates full system reset with t_PURST hold time after release.
6 RESET	Active-HIGH reset output	CMOS output asserted HIGH during V_CC brownout or MR assertion; releases only after V_CC > V_TRIP1 + t_PURST.
7 V_SS	Ground reference	Primary return path for all internal circuits; requires low-impedance PCB plane connection.
8 SDA	I²C bidirectional data line	Open-drain interface supporting standard/fast-mode I²C; requires external pull-up resistor (typically 2.2kΩ).
9 SCL	I²C clock input	Master-generated clock synchronizing all EEPROM reads/writes and register accesses.
10 WP	Hardware write protect	Active-HIGH signal disabling all EEPROM and register writes; internal 10MΩ pull-down ensures safe default state.
11 V3MON	Tertiary voltage input	Direct connection for 1.8V rail monitoring; comparator powered by V3MON - remains functional even if V_CC = 0.
12 V3FAIL	Open-drain tertiary fail indicator	Asserts LOW when V3MON < V_TRIP3; enables independent notification of auxiliary supply failure.
13 WDO	Watchdog timeout output	Open-drain active-LOW signal indicating microcontroller hang; can drive external reset or interrupt controller.
14 V_CC	Main supply input	2.7–5.5V operating range powers core logic, V1MON comparator, and I²C interface; also supplies RESET driver.

Key Features

Feature	Design Value
Triple independent voltage supervision	Monitors V_CC, V2MON, and V3MON simultaneously with self-powered comparators - eliminates need for external resistive dividers or auxiliary supervisors.
Programmable reset timeout	Four selectable t_PURST values (50/200/400/800ms) stored in nonvolatile PUP1/PUP0 bits - matches diverse processor boot timing requirements without hardware changes.
Block Lock™ EEPROM protection	Configurable write protection for entire array or upper half (256 bytes) via BP bit - prevents accidental overwrites of critical boot parameters or calibration data.
Adjustable voltage thresholds	V_TRIP1/V_TRIP2/V_TRIP3 reprogrammable via high-voltage sequence on WDO pin - enables fine-tuning for ±1% tolerance rails without redesigning BOM.
Fault Detection Register (FDR)	Volatile 8-bit register (0FFh) capturing root cause of last reset (LV1F/LV2F/LV3F/WDF/MRF) - enables deterministic post-mortem diagnostics in field-deployed equipment.

Applications

Network Server Power Management	Disk Array Voltage Sequencing
Use Scenario: Monitoring 5V main, 3.3V I/O, and 1.8V core rails in dual-CPU server motherboards during cold start and brownout events. IC Role / Device Role / Timing Role: Centralized power supervisor coordinating reset assertion across CPU, memory controller, and PCIe switches via shared RESET net. Use Value: Eliminates discrete reset ICs and voltage monitors, reducing component count by 3–4 devices while providing unified fault logging via FDR.	Use Scenario: Ensuring proper power-up order and detecting premature dropout of 12V spindle, 5V logic, and 3.3V interface rails in enterprise SAS/SATA storage enclosures. IC Role / Device Role / Timing Role: Triple-rail supervisor generating early LOWLINE warning and sequenced RESET release to prevent disk firmware corruption during unstable power conditions. Use Value: Prevents RAID controller lockup by halting initialization until all rails stabilize, verified by simultaneous V1/V2/V3 pass status before releasing RESET.
Industrial PLC Controller Supervision	Telecom Router Power Integrity
Use Scenario: Supervising 24V field bus, 5V logic, and 3.3V FPGA configuration rails in harsh-environment programmable logic controllers. IC Role / Device Role / Timing Role: Fault-tolerant supervisor with V2MON/V3MON inputs monitoring isolated DC-DC outputs; V2FAIL/V3FAIL feed PLC watchdog interrupt lines. Use Value: Enables deterministic fail-safe response (e.g., emergency stop activation) within 10µs of detected rail collapse, independent of main V_CC status.	Use Scenario: Detecting undervoltage on PoE-derived 48V-to-12V, 12V-to-5V, and 5V-to-3.3V conversion stages in carrier-grade edge routers. IC Role / Device Role / Timing Role: Triple-threshold supervisor with programmable V_TRIP values matching PoE midspan tolerances (±3%), feeding RESET to ARM-based packet processor. Use Value: Maintains RFC-compliant uptime by preventing packet forwarding during marginal power conditions - validated via I²C-read FDR after every reset event.

Network Server Power Management

Disk Array Voltage Sequencing

Use Scenario: Monitoring 5V main, 3.3V I/O, and 1.8V core rails in dual-CPU server motherboards during cold start and brownout events.

IC Role / Device Role / Timing Role: Centralized power supervisor coordinating reset assertion across CPU, memory controller, and PCIe switches via shared RESET net.

Use Value: Eliminates discrete reset ICs and voltage monitors, reducing component count by 3–4 devices while providing unified fault logging via FDR.

Use Scenario: Ensuring proper power-up order and detecting premature dropout of 12V spindle, 5V logic, and 3.3V interface rails in enterprise SAS/SATA storage enclosures.

IC Role / Device Role / Timing Role: Triple-rail supervisor generating early LOWLINE warning and sequenced RESET release to prevent disk firmware corruption during unstable power conditions.

Use Value: Prevents RAID controller lockup by halting initialization until all rails stabilize, verified by simultaneous V1/V2/V3 pass status before releasing RESET.

Industrial PLC Controller Supervision

Telecom Router Power Integrity

Use Scenario: Supervising 24V field bus, 5V logic, and 3.3V FPGA configuration rails in harsh-environment programmable logic controllers.

IC Role / Device Role / Timing Role: Fault-tolerant supervisor with V2MON/V3MON inputs monitoring isolated DC-DC outputs; V2FAIL/V3FAIL feed PLC watchdog interrupt lines.

Use Value: Enables deterministic fail-safe response (e.g., emergency stop activation) within 10µs of detected rail collapse, independent of main V_CC status.

Use Scenario: Detecting undervoltage on PoE-derived 48V-to-12V, 12V-to-5V, and 5V-to-3.3V conversion stages in carrier-grade edge routers.

IC Role / Device Role / Timing Role: Triple-threshold supervisor with programmable V_TRIP values matching PoE midspan tolerances (±3%), feeding RESET to ARM-based packet processor.

Use Value: Maintains RFC-compliant uptime by preventing packet forwarding during marginal power conditions - validated via I²C-read FDR after every reset event.

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
MAX6824EUT+T	Single-supply supervisor (V_CC only); no V2MON/V3MON inputs; 256-byte EEPROM; fixed 200ms t_PURST.	Lacks independent secondary/tertiary rail monitoring - requires external comparators for multi-rail systems.	Select when only primary V_CC supervision is needed and board space is constrained; not suitable for true triple-rail applications.
TPS386000RGPT	Triple-voltage supervisor with 128-byte SRAM (not EEPROM); no integrated memory; 6-pin WSON package; fixed thresholds only.	No nonvolatile storage for configuration or fault logs - requires external SPI EEPROM for persistent data.	Choose for cost-sensitive designs where fault history is logged externally and precise threshold adjustment is unnecessary.

Compared with MAX6824EUT+T and TPS386000RGPT, the X40430S14I-A uniquely combines triple independent voltage monitoring, field-adjustable thresholds, and 4Kbit EEPROM in a single 14-pin package - enabling compact, self-contained power integrity solutions for complex multi-rail embedded systems without external components or firmware overhead.

Availability

X40430S14I-A is available at Aetrix Electronics and suitable for network servers, disk arrays, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed traceability for safety-critical deployments.

Supply support for X40430S14I-A 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, configurability, and integration for industrial and communications infrastructure.

The X40430 series was designed to consolidate power-on reset, watchdog, triple-voltage monitoring, and EEPROM into one die - targeting space-constrained, high-reliability applications in networking, storage, and automation where discrete supervision increases failure points.

FAQ

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

The X40430S14I-A ships with t_PURST set to 200ms, controlled by PUP1/PUP0 bits (01 binary) in the nonvolatile control register. This value ensures sufficient stabilization time for most 3.3V and 5V microcontrollers before releasing the active-HIGH RESET signal. The timeout can be reconfigured to 50ms, 400ms, or 800ms via I²C write sequence without hardware modification, and the new setting persists across power cycles. The X40430S14I-A's t_PURST accuracy is ±10% over temperature.

How does the X40430S14I-A handle voltage monitoring when V_CC drops to 0V?

The X40430S14I-A maintains functionality of V2MON and V3MON comparators even when V_CC = 0V because their comparators are powered directly by the respective input pins (V2MON and V3MON), not by V_CC. This allows the device to detect failures on secondary and tertiary rails independently of main supply status - critical for detecting unregulated supply collapse in systems with backup batteries or auxiliary converters. However, V1MON (V_CC monitoring) and the RESET output cease operation below 1V V_CC, as specified in the X40430S14I-A datasheet.

Can the X40430S14I-A's EEPROM be written to while the watchdog timer is enabled?

Yes, the X40430S14I-A's 4Kbit EEPROM can be written to while the watchdog timer is enabled. The I²C interface operates independently of the watchdog circuit - EEPROM writes use SDA/SCL communication and do not interfere with WDO assertion. However, during an EEPROM write cycle (typical 5ms), the device ignores all I²C commands including watchdog restart sequences, so the watchdog timer must be configured with a timeout longer than the maximum EEPROM write duration (10ms max) to avoid spurious resets. The X40430S14I-A's watchdog disable state (WD1/WD0 = 11) is factory default.

What is the purpose of the LOWLINE pin on the X40430S14I-A, and how does it differ from RESET?

The LOWLINE pin on the X40430S14I-A is a CMOS output that asserts LOW when V_CC falls below V_TRIP1, but unlike RESET, it has no power-up reset delay (t_PURST) and transitions immediately. This makes LOWLINE ideal for early-warning functions such as initiating graceful shutdown, disabling non-critical peripherals, or triggering backup power switchover before the full system reset occurs. RESET remains active for the full t_PURST duration after V_CC recovery, ensuring processor reset completeness, whereas LOWLINE returns HIGH as soon as V_CC exceeds V_TRIP1.

How is the fault cause of a reset determined using the X40430S14I-A?

The X40430S14I-A stores reset cause information in its volatile Fault Detection Register (FDR) at address 0FFh. After any reset event, bits LV1F (V_CC fail), LV2F (V2MON fail), LV3F (V3MON fail), WDF (watchdog timeout), and MRF (manual reset) are cleared to '0' to indicate the triggering condition. The host microcontroller reads this register via I²C immediately after reset to determine root cause, then writes 0xFF to reinitialize the FDR for next-cycle monitoring. This diagnostic capability is intrinsic to the X40430S14I-A and requires no external logic or additional firmware overhead.

X40430S14I-A 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, 2.9V, 4.6V

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-A FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40430S14I-A?

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

Once your X40430S14I-A 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-A?

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

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

All X40430S14I-A 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-A meets industry standards.

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

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

Return procedure for X40430S14I-A:

1.Submit a request within 90 days.

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

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