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

Renesas X40626S14I-4.5A

Name: X40626S14I-4.5A
Brand: Renesas
SKU: X40626S14I-4.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X40626S14I-4.5A

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X40626S14I-4.5A.pdf

Description:: IC SUPERVISOR 2 CHANNEL 14SOIC

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Product details

Overview

X40626S14I-4.5A from Xicor (now part of Renesas) is a dual-voltage CPU supervisor IC integrating power-on reset control, watchdog timer, low-V_CC monitoring, and 64 Kbit serial EEPROM. It features user-programmable V_TRIP threshold (factory-set to 4.5 V), 200 ms reset timeout, 400 kHz I²C interface, and Block Lock™ EEPROM protection - deployed in industrial microcontroller systems requiring reliable brownout recovery and nonvolatile configuration storage.

For engineers reviewing the X40626S14I-4.5A datasheet, X40626S14I-4.5A pinout, X40626S14I-4.5A application, or X40626S14I-4.5A equivalent, key selection criteria include its dual-supply monitoring capability (V_CC + V_2MON), programmable reset threshold, open-drain RESET/V_2FAIL outputs, 14-pin SOIC/TSSOP package, and EEPROM page-write endurance (100,000 cycles).

Technical Context

The X40626S14I-4.5A implements independent voltage supervision for V_CC and V_2MON, with separate comparator circuits driving active-low open-drain RESET and V_2FAIL outputs. Its watchdog timer monitors SDA transitions during SCL HIGH and supports three timeout intervals (200 ms, 600 ms, 1.4 s) via nonvolatile WD1/WD0 bits.

EEPROM functionality uses a 64-byte page architecture with Direct Write™ cells, supporting byte/page writes over a 2-wire I²C bus (up to 4 devices per bus). Block Lock™ protection is controlled by BP2–BP0 bits and hardware WP pin, enabling selective write lock of 64–8192 bytes or full array.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Threshold	4.5 V nominal; factory-programmed trip point, reprogrammable via VP on WP pin for precision system-level brownout detection.
Reset Timeout	200 ms typical; ensures stable power and oscillator startup before processor release, preventing premature code execution.
Watchdog Timeout	Selectable 200 ms / 600 ms / 1.4 s; nonvolatile setting prevents accidental change across power cycles.
EEPROM Capacity	64 Kbit (8 K × 8); organized as 1024 pages of 64 bytes, enabling efficient firmware parameter storage with page-write efficiency.
I²C Interface	400 kHz max clock rate; supports up to 4 slave addresses (S0/S1 pins), compatible with standard I²C protocol and open-drain bus topology.
Supply Range	2.7 V to 5.5 V; enables operation across wide-input industrial power rails without external regulation.
Standby Current	20 µA max with watchdog enabled; critical for battery-backed or low-power embedded systems maintaining supervision state.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 6, 13	NC	No internal connection; must be left unconnected or tied to ground per layout best practice.
2, 3	S0, S1	Device select inputs; configure I²C slave address (00–11) to support up to four X40626 devices on same bus.
5	RESET	Active-low open-drain reset output; asserts during V_CC undervoltage, watchdog timeout, or power-up; requires external pull-up.
7	V_SS	Ground reference; primary return path for all internal circuits and I²C interface.
8	SDA	Bidirectional I²C data line; open-drain structure allows wire-OR with other slaves; also serves as watchdog trigger input.
9	SCL	I²C clock input; synchronous timing reference for all EEPROM read/write and register access operations.
10	V_2FAIL	Active-low open-drain V₂ monitor fail output; independent of V_CC reset logic; used for secondary supply fault signaling.
11	V_2MON	Secondary voltage monitor input; accepts direct connection to auxiliary rail or resistor divider for custom V_TRIP2 setting.
12	WP	Hardware write protect input; when HIGH with WPEN bit set, blocks all EEPROM and control register writes including Block Lock changes.
14	V_CC	Main supply voltage input; powers all internal functions including reset generator, watchdog, and EEPROM core; range 2.7–5.5 V.

Key Features

Feature	Design Value
User-programmable V_TRIP	Factory-set to 4.5 V but reconfigurable via VP pulse on WP pin - enables precise brownout tuning without component change.
Dual independent voltage monitoring	Simultaneous V_CC and V_2MON supervision with separate RESET and V_2FAIL outputs - supports redundant power architectures.
Nonvolatile watchdog timeout selection	WD1/WD0 bits retain setting across power cycles - eliminates need for boot-time initialization of watchdog interval.
Block Lock™ EEPROM protection	Eight configurable lock segments (64–8192 bytes) controlled by BP2–BP0 bits - prevents accidental overwrite of critical calibration or security data.
Direct Write™ EEPROM cell	100,000 write/erase cycles and 100-year data retention - suitable for field-updatable firmware parameters in long-lifecycle equipment.

Applications

Industrial PLC Controller	Medical Diagnostic Device
Use Scenario: Monitors main 5 V logic rail and isolated 3.3 V sensor supply while storing calibration coefficients and error logs in EEPROM. IC Role / Device Role / Timing Role: Dual-supply supervisor with programmable V_TRIP and nonvolatile memory - provides coordinated reset assertion and persistent parameter storage. Use Value: Prevents erratic behavior during partial power loss; retains last-known-good calibration after brownout recovery without external backup power.	Use Scenario: Ensures safe shutdown during AC mains interruption by supervising both microcontroller V_CC and battery-backed real-time clock supply. IC Role / Device Role / Timing Role: Independent V_CC/V_2MON monitoring with 200 ms reset hold time - guarantees deterministic reset sequence before safety-critical firmware restart. Use Value: Meets IEC 62304 Class C software requirements by eliminating race conditions between power stabilization and processor initialization.
Smart Energy Meter	Automotive Body Control Module
Use Scenario: Stores tariff tables and metering history in EEPROM while detecting undervoltage on 3.3 V MCU rail and 12 V battery-derived analog front-end supply. IC Role / Device Role / Timing Role: Dual-rail supervisor with 400 kHz I²C interface - enables secure, low-overhead parameter updates during meter firmware upgrades. Use Value: Block Lock™ protection prevents corruption of revenue-grade energy data during OTA updates or transient EMI events.	Use Scenario: Supervises 5 V infotainment MCU and 12 V lighting driver supply, logging fault codes in EEPROM upon V_2FAIL assertion. IC Role / Device Role / Timing Role: V_2FAIL output directly triggers CAN fault frame transmission - provides immediate diagnostic visibility of auxiliary supply failure. Use Value: Eliminates need for discrete comparators and external EEPROM, reducing BOM count and PCB area in space-constrained modules.

Industrial PLC Controller

Medical Diagnostic Device

Use Scenario: Monitors main 5 V logic rail and isolated 3.3 V sensor supply while storing calibration coefficients and error logs in EEPROM.

IC Role / Device Role / Timing Role: Dual-supply supervisor with programmable V_TRIP and nonvolatile memory - provides coordinated reset assertion and persistent parameter storage.

Use Value: Prevents erratic behavior during partial power loss; retains last-known-good calibration after brownout recovery without external backup power.

Use Scenario: Ensures safe shutdown during AC mains interruption by supervising both microcontroller V_CC and battery-backed real-time clock supply.

IC Role / Device Role / Timing Role: Independent V_CC/V_2MON monitoring with 200 ms reset hold time - guarantees deterministic reset sequence before safety-critical firmware restart.

Use Value: Meets IEC 62304 Class C software requirements by eliminating race conditions between power stabilization and processor initialization.

Smart Energy Meter

Automotive Body Control Module

Use Scenario: Stores tariff tables and metering history in EEPROM while detecting undervoltage on 3.3 V MCU rail and 12 V battery-derived analog front-end supply.

IC Role / Device Role / Timing Role: Dual-rail supervisor with 400 kHz I²C interface - enables secure, low-overhead parameter updates during meter firmware upgrades.

Use Value: Block Lock™ protection prevents corruption of revenue-grade energy data during OTA updates or transient EMI events.

Use Scenario: Supervises 5 V infotainment MCU and 12 V lighting driver supply, logging fault codes in EEPROM upon V_2FAIL assertion.

IC Role / Device Role / Timing Role: V_2FAIL output directly triggers CAN fault frame transmission - provides immediate diagnostic visibility of auxiliary supply failure.

Use Value: Eliminates need for discrete comparators and external EEPROM, reducing BOM count and PCB area in space-constrained modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361KA29+T	Single-supply only (2.93 V reset threshold); no V_2MON input or V_2FAIL output; 16 Kbit EEPROM; 10-pin µMAX package.	Lacks dual-supply monitoring and secondary fail signaling - unsuitable where independent V₂ fault isolation is required.	Select when only primary V_CC supervision is needed and board space constraints favor smaller package.
STM8AF6266TCX	MCU-based solution with embedded EEPROM and software-configurable reset thresholds; requires firmware development; 32-pin LQFP.	Offers greater flexibility but adds design complexity, qualification effort, and failsafe risk if firmware hangs.	Select when system already uses STM8A platform and requires custom reset sequencing beyond fixed-timer watchdog.

Compared with MAX6361KA29+T and STM8AF6266TCX, the X40626S14I-4.5A uniquely delivers factory-trimmed dual-supply monitoring with field-reprogrammable V_TRIP, eliminating both external components and firmware dependencies for robust, drop-in power management in cost-sensitive industrial designs.

Availability

X40626S14I-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for X40626S14I-4.5A 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 to strengthen its analog and mixed-signal portfolio.

The X40626 product line was designed for embedded systems needing integrated reset supervision, watchdog protection, and reliable EEPROM storage - targeting industrial automation, medical instrumentation, and utility metering applications.

FAQ

What is the factory-programmed V_TRIP threshold for the X40626S14I-4.5A?

The X40626S14I-4.5A is shipped with a factory-programmed V_TRIP threshold of 4.5 V, as indicated by the "-4.5A" suffix in the part number. This value is stored in nonvolatile memory and remains stable over temperature and time unless explicitly reprogrammed using the VP pulse method on the WP pin.

Does the X40626S14I-4.5A support dual-supply monitoring out of the box?

Yes, the X40626S14I-4.5A supports dual-supply monitoring without configuration: V_CC is monitored for reset generation, while V_2MON is independently monitored to drive the V_2FAIL output. Both comparators operate simultaneously and require no initialization or register writes to function.

How many bytes can be protected using Block Lock™ on the X40626S14I-4.5A?

The X40626S14I-4.5A supports eight distinct Block Lock™ protection configurations via BP2–BP0 bits: none, 64 bytes (first page), 128 bytes (first two pages), 256 bytes (first four pages), 512 bytes (first eight pages), 2 Kbytes (upper quarter), 4 Kbytes (upper half), or full 8 Kbyte array - enabling granular write protection for firmware, calibration, or security data.

What is the maximum I²C clock frequency supported by the X40626S14I-4.5A?

The X40626S14I-4.5A supports a maximum I²C clock frequency of 400 kHz, compliant with Fast-mode I²C specification. This allows high-throughput EEPROM access while maintaining compatibility with standard microcontroller I²C peripherals and bus arbitration schemes.

Is the watchdog timer on the X40626S14I-4.5A enabled by default after power-up?

No, the watchdog timer on the X40626S14I-4.5A is disabled by default after power-up, as indicated by WD1=1 and WD0=1 in the factory-default control register. To enable it, the microcontroller must write new values to WD1/WD0 bits - ensuring intentional activation rather than unintended reset behavior during system startup.

X40626S14I-4.5A 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:: 2

Voltage - Threshold:: 2.93V, 4.63V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 100ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

X40626S14I-4.5A FAQ

1.How can I place an order for X40626S14I-4.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for X40626S14I-4.5A 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 X40626S14I-4.5A reliable?

The price and inventory of X40626S14I-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X40626S14I-4.5A is usually 5 days.

3.What payment methods are accepted for X40626S14I-4.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X40626S14I-4.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40626S14I-4.5A?

X40626S14I-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X40626S14I-4.5A 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 X40626S14I-4.5A?

For technical support, including X40626S14I-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X40626S14I-4.5A requirements.

6.How does Aetrix verify that X40626S14I-4.5A is sourced from the original manufacturer or authorized distributors?

All X40626S14I-4.5A 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 X40626S14I-4.5A meets industry standards.

7.What is the process for return or replacement of X40626S14I-4.5A?

All X40626S14I-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X40626S14I-4.5A, 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 X40626S14I-4.5A part is unused and in its original packaging.

Return procedure for X40626S14I-4.5A:

1.Submit a request within 90 days.

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

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