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

Renesas X40626S14-4.5A

Name: X40626S14-4.5A
Brand: Renesas
SKU: X40626S14-4.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X40626S14-4.5A

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X40626S14-4.5A.pdf

Description:: IC SUPERVISOR 2 CHANNEL 14SOIC

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Product details

Overview

X40626S14-4.5A 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 default 4.5 V), 200 ms reset timeout, 400 kHz I²C interface, and 64-byte page EEPROM with Block Lock™ protection. It serves in microcontroller-based embedded systems requiring reliable power sequencing and nonvolatile configuration storage.

For engineers reviewing the X40626S14-4.5A datasheet, X40626S14-4.5A pinout, X40626S14-4.5A application, or X40626S14-4.5A equivalent, key selection considerations include its dual-supply monitoring capability (V_CC + V_2MON), programmable reset threshold, watchdog timeout options (200 ms / 600 ms / 1.4 s), open-drain RESET and V_2FAIL outputs, and hardware write protection via WP pin and WPEN bit.

Technical Context

The X40626S14-4.5A implements independent voltage supervision for V_CC and V_2MON, each with dedicated comparators and open-drain status outputs (RESET and V_2FAIL). Its watchdog timer monitors SDA transitions during SCL HIGH to detect microcontroller lockup, with timeout period set by nonvolatile WD1/WD0 bits in the control register.

Reset assertion is guaranteed down to V_CC = 1 V, and RESET remains active for ≥200 ms after V_CC exceeds V_TRIP. The integrated 64 Kbit EEPROM uses Xicor's Direct Write™ cell technology (100,000 write cycles, 100-year data retention) and supports byte/page writes over a 2-wire I²C-compatible interface with up to four devices per bus.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP Threshold	Factory-programmed 4.5 V ±100 mV; reprogrammable to custom voltage via V_CC/WP sequence - enables precise brown-out detection matching system rail tolerance.
Reset Timeout	200 ms nominal after V_CC rise above V_TRIP - ensures stable power and oscillator settling before processor release.
Watchdog Timeout	Selectable: 200 ms / 600 ms / 1.4 s (via WD1/WD0 bits); disabled by default - provides configurable fail-safe recovery without external components.
I²C Interface Speed	400 kHz maximum - supports standard-mode Fast-mode I²C buses without clock stretching limitations.
EEPROM Capacity	64 Kbit (8 K × 8), organized in 64-byte pages - allows efficient firmware parameter storage and field-updatable calibration data.
Supply Range	2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains and mixed-voltage system designs.
Standby Current	20 µA max (watchdog enabled); 1 µA (watchdog disabled) - minimizes quiescent power in battery-backed or energy-sensitive applications.

Pinout & Package

Package: 14-lead SOIC (Small Outline Integrated Circuit), 150 mil width, JEDEC MS-012AC compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 6, 13	NC	No internal connection - must be left unconnected or tied to GND per layout best practice; no electrical function.
2	S0	Device select input - sets LSB of I²C slave address (A0–A2 = S1/S0/0), enabling up to 4 devices on same bus.
3	S1	Device select input - sets MSB of I²C slave address; combined with S0, defines unique 7-bit address (1010xx0).
5	RESET	Active-low open-drain reset output - asserts during power-up, brown-out (V_CC < V_TRIP), or watchdog timeout; requires external pull-up.
7	VSS	Ground reference - primary return path for all internal circuits and I²C interface; must be low-impedance.
8	SDA	Serial data bidirectional I²C line - open-drain, requires pull-up; also serves as watchdog trigger input (falling edge while SCL=HIGH resets timer).
9	SCL	Serial clock input - controls timing of all I²C read/write operations; master-provided clock signal.
10	V2FAIL	Active-low open-drain V_2MON fail indicator - signals when monitored auxiliary supply falls below V_TRIP2; independent of V_CC reset circuitry.
11	V2MON	Auxiliary voltage monitor input - accepts resistor-divided or direct connection to second supply; comparator has no hysteresis.
12	WP	Hardware write protect input - when HIGH and WPEN bit set, blocks all EEPROM and control register writes; enables tamper-resistant configuration locking.
14	VCC	Main supply voltage input - powers all internal functions including reset generator, watchdog, and EEPROM; operates from 2.7 V to 5.5 V.

Key Features

Feature	Design Value
Dual independent voltage supervision	V_CC and V_2MON monitored separately with dedicated open-drain outputs (RESET and V_2FAIL) - enables robust power-fail detection for main and backup rails.
User-programmable V_TRIP	V_TRIP threshold adjustable via nonvolatile programming sequence using V_CC and WP pin - eliminates need for external resistor dividers or trimming in precision brown-out applications.
Block Lock™ EEPROM protection	Eight configurable protection modes (0 to full array, or 64–512 bytes) controlled by BP2/BP1/BP0 bits - prevents accidental overwrite of critical boot code or calibration data.
Hardware + software write protection	Combines WP pin + WPEN bit and volatile WEL/RWEL latches - enforces layered security: hardware lock survives power loss, software lock enables dynamic reconfiguration.
Watchdog with SDA-triggered reset	Monitors microcontroller activity via SDA transitions during SCL HIGH - detects firmware hangs without requiring dedicated watchdog pin or timer peripheral.

Applications

Industrial PLC Controller	Medical Diagnostic Device
Use Scenario: Monitors 3.3 V logic supply and 5 V analog rail in a programmable logic controller with real-time OS and field-replaceable modules. IC Role / Device Role / Timing Role: Dual-supply supervisor ensures synchronized reset release only after both rails stabilize; EEPROM stores module ID and calibration coefficients. Use Value: Prevents erratic behavior during brown-out events and guarantees safe boot sequence even if either supply dips independently.	Use Scenario: Embedded in portable ultrasound equipment requiring FDA-compliant configuration persistence and fail-safe shutdown on battery voltage sag. IC Role / Device Role / Timing Role: V_CC supervision triggers immediate system halt at 3.0 V; V_2MON tracks battery pack voltage; EEPROM retains last scan settings and safety thresholds. Use Value: Meets IEC 62304 power-fail requirements by asserting RESET before critical analog subsystems malfunction.
Smart Energy Meter	Automotive Body Control Module
Use Scenario: Installed in ANSI C12.20-certified electricity meter with isolated RS-485 communication and tamper-detection circuitry. IC Role / Device Role / Timing Role: Supervises MCU supply and isolated DC-DC converter output; EEPROM stores tariff tables and metering logs with Block Lock™ protecting billing data. Use Value: Hardware write protection (WP + WPEN) prevents unauthorized firmware or tariff updates during field operation.	Use Scenario: Used in 12 V automotive BCM managing door locks, lighting, and CAN gateway functions across temperature range −40 °C to +125 °C. IC Role / Device Role / Timing Role: Monitors 5 V MCU rail and 12 V battery-sensed V_2MON input; watchdog guards against CAN stack lockup; EEPROM stores seat position memory and error codes. Use Value: Dual-threshold reset (4.5 V V_TRIP) matches automotive cold-crank spec; 100-year EEPROM retention ensures lifetime data integrity.

Industrial PLC Controller

Medical Diagnostic Device

Use Scenario: Monitors 3.3 V logic supply and 5 V analog rail in a programmable logic controller with real-time OS and field-replaceable modules.

IC Role / Device Role / Timing Role: Dual-supply supervisor ensures synchronized reset release only after both rails stabilize; EEPROM stores module ID and calibration coefficients.

Use Value: Prevents erratic behavior during brown-out events and guarantees safe boot sequence even if either supply dips independently.

Use Scenario: Embedded in portable ultrasound equipment requiring FDA-compliant configuration persistence and fail-safe shutdown on battery voltage sag.

IC Role / Device Role / Timing Role: V_CC supervision triggers immediate system halt at 3.0 V; V_2MON tracks battery pack voltage; EEPROM retains last scan settings and safety thresholds.

Use Value: Meets IEC 62304 power-fail requirements by asserting RESET before critical analog subsystems malfunction.

Smart Energy Meter

Automotive Body Control Module

Use Scenario: Installed in ANSI C12.20-certified electricity meter with isolated RS-485 communication and tamper-detection circuitry.

IC Role / Device Role / Timing Role: Supervises MCU supply and isolated DC-DC converter output; EEPROM stores tariff tables and metering logs with Block Lock™ protecting billing data.

Use Value: Hardware write protection (WP + WPEN) prevents unauthorized firmware or tariff updates during field operation.

Use Scenario: Used in 12 V automotive BCM managing door locks, lighting, and CAN gateway functions across temperature range −40 °C to +125 °C.

IC Role / Device Role / Timing Role: Monitors 5 V MCU rail and 12 V battery-sensed V_2MON input; watchdog guards against CAN stack lockup; EEPROM stores seat position memory and error codes.

Use Value: Dual-threshold reset (4.5 V V_TRIP) matches automotive cold-crank spec; 100-year EEPROM retention ensures lifetime data integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361KA29+T	Single-supply (V_CC-only) supervisor; 16 Kbit EEPROM; fixed 2.93 V reset threshold; no V_2MON or programmable V_TRIP.	Lacks dual-voltage monitoring and programmability - suitable only where auxiliary rail supervision is unnecessary.	Select when cost sensitivity outweighs need for V_2MON or custom trip point; verify EEPROM size suffices for application data.
STM8AF6266TCX	MCU-based solution (8-bit STM8 core); integrates 32 Kbyte Flash, 2 Kbyte RAM, and 1 Kbyte EEPROM; requires firmware development.	Provides programmable logic and GPIO but adds BOM complexity, validation effort, and firmware maintenance overhead.	Choose only when system already uses STM8 platform and requires runtime configurability beyond fixed-function supervision.

Compared with MAX6361KA29+T and STM8AF6266TCX, the X40626S14-4.5A delivers unique dual-rail supervision with field-adjustable reset threshold and larger EEPROM capacity - reducing design risk in multi-rail industrial and medical systems where deterministic power sequencing is mandatory.

Availability

X40626S14-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, automotive body control modules, and embedded instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for X40626S14-4.5A 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. Known for innovation in EEPROM architecture and supervisor reliability.

The X40626 product line was designed for embedded systems needing consolidated power supervision, watchdog safety, and persistent configuration storage - targeting applications where board space, BOM count, and functional integration are critical constraints.

FAQ

What is the factory-default V_TRIP threshold for the X40626S14-4.5A?

The X40626S14-4.5A ships with a factory-programmed V_TRIP threshold of 4.5 V ±100 mV. This value is stored in nonvolatile memory and remains stable across temperature and time. It can be reprogrammed to a custom voltage using the V_CC/WP programming sequence described in the datasheet - a feature unique to the X40626S14-4.5A among legacy supervisors.

Does the X40626S14-4.5A support I²C Fast Mode Plus (1 MHz)?

No, the X40626S14-4.5A supports standard-mode and Fast-mode I²C up to 400 kHz only. Its SDA and SCL input buffers and timing parameters are characterized for operation at ≤400 kHz. Attempting 1 MHz operation may result in missed acknowledges or corrupted EEPROM writes. For higher-speed interfaces, consider discrete I²C level shifters or alternative supervisors with Fast Mode Plus compliance.

How does the watchdog timer in the X40626S14-4.5A detect microcontroller failure?

The X40626S14-4.5A watchdog timer monitors the SDA line for falling-edge transitions while SCL is held HIGH - corresponding to valid I²C start conditions. If no such transition occurs within the selected timeout (200 ms / 600 ms / 1.4 s), the device asserts RESET. This method requires no dedicated watchdog pin and leverages existing I²C bus activity as a liveness signal - a key design feature of the X40626S14-4.5A.

Can the V_2MON input of the X40626S14-4.5A monitor a 12 V automotive battery directly?

No, the X40626S14-4.5A V_2MON input is rated for 0 V to V_CC + 0.3 V only. To monitor a 12 V battery, an external resistor divider must scale the voltage to ≤5.5 V (within V_CC operating range). The datasheet specifies no internal hysteresis on this comparator, so external RC filtering may be needed for noise immunity in automotive environments where the X40626S14-4.5A is deployed.

What EEPROM protection mechanisms are implemented in the X40626S14-4.5A?

The X40626S14-4.5A implements three-tiered EEPROM protection: (1) Power-cycle write inhibit - writes blocked while RESET is active; (2) Block Lock™ - eight protection modes (0 to full array or 64–512 bytes) set via BP2/BP1/BP0 bits; (3) Hardware/software lock - WP pin + WPEN bit enables permanent write disable, while WEL/RWEL latches allow temporary unlock for field updates. All are active in the X40626S14-4.5A.

X40626S14-4.5A 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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

X40626S14-4.5A FAQ

1.How can I place an order for X40626S14-4.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for X40626S14-4.5A 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 X40626S14-4.5A reliable?

The price and inventory of X40626S14-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X40626S14-4.5A is usually 5 days.

3.What payment methods are accepted for X40626S14-4.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X40626S14-4.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X40626S14-4.5A?

X40626S14-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X40626S14-4.5A 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 X40626S14-4.5A?

For technical support, including X40626S14-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X40626S14-4.5A requirements.

6.How does Aetrix verify that X40626S14-4.5A is sourced from the original manufacturer or authorized distributors?

All X40626S14-4.5A 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 X40626S14-4.5A meets industry standards.

7.What is the process for return or replacement of X40626S14-4.5A?

All X40626S14-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X40626S14-4.5A, 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 X40626S14-4.5A part is unused and in its original packaging.

Return procedure for X40626S14-4.5A:

1.Submit a request within 90 days.

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

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