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

Renesas X5043S8I-2.7AT1

Name: X5043S8I-2.7AT1
Brand: Renesas
SKU: X5043S8I-2.7AT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X5043S8I-2.7AT1

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: X5043S8I-2.7AT1.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

X5043S8I-2.7AT1 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in an 8-lead SOIC package. It features 2.85V–3.0V V_TRIP, -40°C to +85°C operation, active-low RESET output, and 3.3MHz SPI interface - used for reliable boot sequencing and data retention in industrial microcontroller systems.

For engineers reviewing the X5043S8I-2.7AT1 datasheet, X5043S8I-2.7AT1 pinout, X5043S8I-2.7AT1 application, or X5043S8I-2.7AT1 equivalent, this page delivers verified functional identity, confirmed V_TRIP threshold, validated watchdog timeout options, exact SPI timing compliance, and real-world block-lock protection behavior - all specific to the X5043S8I-2.7AT1 variant.

Technical Context

The X5043S8I-2.7AT1 implements a dual-function CS/WDI pin that serves as both chip select and watchdog input, with falling-edge-triggered watchdog reset. Its internal voltage detector asserts RESET when V_CC drops below 2.85V (±2.5%), holding it active until V_CC exceeds 2.85V for 200ms and stabilizes.

It uses a nonvolatile status register to configure watchdog timeout (200ms/600ms/1.4s/disabled) and EEPROM block lock (none/¼/½/all), with Direct Write™ EEPROM cells rated for 1M write cycles and 100-year data retention. The device supports 16-byte page writes with 10ms typical write cycle time.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP Threshold	2.85V ±2.5% - ensures system reset before brownout at 2.7V nominal supply
Operating Voltage Range	2.7V–5.5V - supports single-supply operation across 3.3V and 5V logic domains
SPI Clock Rate	3.3MHz max - enables fast configuration and EEPROM access without external clock dividers
EEPROM Capacity	4Kbit (512 × 8) - stores critical calibration, serial ID, or firmware state in one integrated device
Watchdog Timeout Options	200ms / 600ms / 1.4s / disabled - selectable via nonvolatile status register bits WD1/WD0
Reset Output Type	Active-low open-drain - allows wired-OR reset bus sharing and flexible pull-up selection
Standby Current (WDT off)	<10µA at 5.5V - minimizes battery drain in always-on monitoring applications

Pinout & Package

Package: 8-lead SOIC (3.9mm × 4.9mm), RoHS-compliant, Pb-free plus anneal finish.

Pin/Terminal	Circuit Role	Design Meaning
1: CS/WDI	Chip Select Input / Watchdog Input	Active-low enable for SPI commands; falling edge resets watchdog timer
2: WP	Write Protect Input	Low = disables all nonvolatile writes (EEPROM and status register); overrides WREN latch
3: SO	Serial Output	Push-pull output; data shifted out on SCK falling edge during READ operations
4: V_SS	Ground	Reference return path for all digital and analog circuitry
5: V_CC	Supply Voltage	2.7V–5.5V input powering reset generator, watchdog, EEPROM, and SPI interface
6: SCK	Serial Clock Input	Controls timing of SI sampling (rising edge) and SO output (falling edge)
7: SI	Serial Input	Accepts opcodes, addresses, and data; latched on SCK rising edge
8: RESET	Reset Output	Active-low open-drain output asserted during power-up, brownout, or watchdog timeout

Key Features

Feature	Design Value
Reprogrammable V_TRIP	Voltage threshold can be adjusted to custom values (e.g., 2.92V) using VP = 15–18V on WP pin and WREN + write to address 01h
Block Lock™ Protection	Nonvolatile BL0/BL1 bits allow selective write-protection of 0%, 25%, 50%, or 100% of EEPROM array
Direct Write™ EEPROM	1M write endurance and 100-year data retention - eliminates need for external wear-leveling firmware
Write Enable Latch (WEL)	Volatility ensures write safety: latch auto-resets on power-up, write completion, or WP low assertion
Valid RESET down to 1V	Guarantees clean reset assertion even during deep brownout or battery sag conditions

Applications

Industrial Process Controller	Network Router Bootloader
Use Scenario: Microcontroller-based PLC module operating in factory environments with fluctuating 3.3V rail. IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 provides power-on reset, monitors 3.3V supply against 2.85V trip point, and stores sensor calibration coefficients in protected EEPROM. Use Value: Prevents erratic startup during line transients and retains field-tuned parameters across 10+ years without backup battery.	Use Scenario: Embedded Linux router requiring secure boot integrity and persistent MAC address storage. IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 holds bootloader configuration, enforces watchdog supervision of main CPU, and protects MAC EEPROM region from accidental overwrite. Use Value: Eliminates separate reset IC + EEPROM BOM items while ensuring tamper-resistant MAC persistence through 1M rewrites.
Medical Diagnostic Handheld	Smart Energy Meter
Use Scenario: Battery-powered ultrasound probe with cold-start requirement and regulatory data logging. IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 guarantees safe MCU initialization at 2.7V battery cutoff and stores FDA-mandated usage logs in block-locked EEPROM pages. Use Value: Meets IEC 62304 power-fail safety requirements and achieves 100-year log retention without FRAM cost premium.	Use Scenario: DIN-rail mounted meter exposed to wide temperature swings (-40°C to +85°C) and grid voltage sags. IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 supervises 3.3V rail derived from isolated DC-DC converter and stores tariff tables in EEPROM with hardware write protection. Use Value: Maintains accurate billing data across 20+ years of field operation with no field-replacement risk from EEPROM corruption.

Industrial Process Controller

Network Router Bootloader

Use Scenario: Microcontroller-based PLC module operating in factory environments with fluctuating 3.3V rail.

IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 provides power-on reset, monitors 3.3V supply against 2.85V trip point, and stores sensor calibration coefficients in protected EEPROM.

Use Value: Prevents erratic startup during line transients and retains field-tuned parameters across 10+ years without backup battery.

Use Scenario: Embedded Linux router requiring secure boot integrity and persistent MAC address storage.

IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 holds bootloader configuration, enforces watchdog supervision of main CPU, and protects MAC EEPROM region from accidental overwrite.

Use Value: Eliminates separate reset IC + EEPROM BOM items while ensuring tamper-resistant MAC persistence through 1M rewrites.

Medical Diagnostic Handheld

Smart Energy Meter

Use Scenario: Battery-powered ultrasound probe with cold-start requirement and regulatory data logging.

IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 guarantees safe MCU initialization at 2.7V battery cutoff and stores FDA-mandated usage logs in block-locked EEPROM pages.

Use Value: Meets IEC 62304 power-fail safety requirements and achieves 100-year log retention without FRAM cost premium.

Use Scenario: DIN-rail mounted meter exposed to wide temperature swings (-40°C to +85°C) and grid voltage sags.

IC Role / Device Role / Timing Role: X5043S8I-2.7AT1 supervises 3.3V rail derived from isolated DC-DC converter and stores tariff tables in EEPROM with hardware write protection.

Use Value: Maintains accurate billing data across 20+ years of field operation with no field-replacement risk from EEPROM corruption.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361KA29+T	Fixed 2.93V V_TRIP, no reprogrammability; 2Kbit EEPROM; no block lock	Lacks adjustable reset threshold and EEPROM protection granularity - suitable only for fixed-voltage designs without data security needs	Select if 2.93V threshold suffices and EEPROM size/capability requirements are lower
MCP9808-E/P	Temperature sensor IC - no reset, watchdog, or EEPROM functions	Not functionally equivalent; serves entirely different sensing role	Not applicable as alternative - included only due to common distributor catalog misclassification

Compared with MAX6361KA29+T, X5043S8I-2.7AT1 offers field-adjustable V_TRIP, 2× EEPROM capacity, and hardware-enforced block locking - critical for industrial recalibration and regulatory data integrity. MCP9808-E/P is not a functional substitute.

Availability

X5043S8I-2.7AT1 is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for X5043S8I-2.7AT1 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

Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and communications markets.

The X5043 family was designed specifically for embedded systems needing integrated power supervision, fail-safe watchdog coverage, and nonvolatile configuration storage - reducing board space and improving system-level reliability over discrete solutions.

FAQ

What is the exact V_TRIP voltage specification for X5043S8I-2.7AT1?

The X5043S8I-2.7AT1 has a factory-programmed V_TRIP of 2.85V ±2.5%, corresponding to the "-2.7A" suffix per FN8126 Rev 3.00 ordering table. This threshold is guaranteed over -40°C to +85°C and remains stable across 1000+ power cycles unless reprogrammed using the VP=15–18V method described on page 6.

Does X5043S8I-2.7AT1 support active-high reset output?

No. X5043S8I-2.7AT1 provides only active-low RESET output (open-drain). The "X5045" variant in the same family offers active-high RESET, but X5043S8I-2.7AT1 is strictly active-low. Pull-up resistor selection determines logic-high level, compatible with 1.8V–5.5V host systems.

Can the watchdog timer on X5043S8I-2.7AT1 be disabled after power-up?

Yes. The watchdog timer is disabled by default (WD1=WD0=1 per status register default value 30h). It can be enabled or reconfigured via WRSR instruction writing to status register bits WD1/WD0. Once set, the timeout persists across power cycles since these bits are nonvolatile.

What is the maximum SPI clock frequency supported by X5043S8I-2.7AT1?

X5043S8I-2.7AT1 supports up to 3.3MHz SCK frequency across its full 2.7V–5.5V V_CC range, as specified in AC Electrical Characteristics (page 14). This allows full-speed communication with modern MCUs without clock stretching or wait states.

How does the block lock protection work on X5043S8I-2.7AT1's EEPROM?

X5043S8I-2.7AT1 uses nonvolatile BL0/BL1 bits in its status register to protect 0%, 25%, 50%, or 100% of the 512-byte EEPROM array. When a region is locked, write attempts (including page writes) to that region are ignored - even if WREN is set and WP is high. Protection is enforced in hardware, independent of software control.

X5043S8I-2.7AT1 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.92V

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:: 8-SOIC

X5043S8I-2.7AT1 FAQ

1.How can I place an order for X5043S8I-2.7AT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for X5043S8I-2.7AT1 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 X5043S8I-2.7AT1 reliable?

The price and inventory of X5043S8I-2.7AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5043S8I-2.7AT1 is usually 5 days.

3.What payment methods are accepted for X5043S8I-2.7AT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5043S8I-2.7AT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X5043S8I-2.7AT1?

X5043S8I-2.7AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X5043S8I-2.7AT1 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 X5043S8I-2.7AT1?

For technical support, including X5043S8I-2.7AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5043S8I-2.7AT1 requirements.

6.How does Aetrix verify that X5043S8I-2.7AT1 is sourced from the original manufacturer or authorized distributors?

All X5043S8I-2.7AT1 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 X5043S8I-2.7AT1 meets industry standards.

7.What is the process for return or replacement of X5043S8I-2.7AT1?

All X5043S8I-2.7AT1 units undergo pre-shipment inspection (PSI). If there is an issue with X5043S8I-2.7AT1, 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 X5043S8I-2.7AT1 part is unused and in its original packaging.

Return procedure for X5043S8I-2.7AT1:

1.Submit a request within 90 days.

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

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