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Renesas X4043M8
- Part No.:
- X4043M8
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
X4043M8.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
X4043M8 from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit EEPROM in an 8-pin MSOP package. It features active-low RESET output, 4.5V–5.5V supply range, five selectable VTRIP thresholds (4.5V–4.75V), <20µA standby current with watchdog enabled, and 400kHz I²C interface - used in embedded microcontroller systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4043M8 datasheet, X4043M8 pinout, X4043M8 application, or X4043M8 equivalent, key selection considerations include its 4.5V reset threshold, MSOP-8 footprint, Block Lock™ EEPROM protection, programmable VTRIP, and compatibility with I²C-based system initialization and fault recovery sequences.
Technical Context
The X4043M8 implements a dual-function reset architecture: power-on reset asserts RESET for 250ms after VCC stabilization, while low-VCC detection holds RESET active until VCC exceeds VTRIP for 200ms and remains ≥1V. Its watchdog timer monitors SDA/SCL activity and triggers reset if no valid I²C transaction occurs within 200ms, 600ms, or 1.4s - configurable via nonvolatile WD1/WD0 bits.
EEPROM operation uses Intersil's Direct Write™ cell technology (1M write cycles, 100-year retention) with 16-byte page writes and software-controlled Block Lock™ protection covering 0–128 bytes or 1/4–full array. The device operates exclusively as an I²C slave (7-bit address 0xA0 for memory, 0xB0 for control register) with open-drain SDA/SCL and external pull-ups required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Type | Active-low open-drain RESET output; asserted during power-up, brownout (VCC < VTRIP), or watchdog timeout. |
| VCC Range | 4.5V to 5.5V - supports standard 5V logic rails with margin for ripple and dropouts. |
| VTRIP Threshold | 4.5V to 4.75V (factory-set); reprogrammable via high-voltage WP sequence for custom precision. |
| Standby Current | <20µA max with watchdog enabled - enables battery-backed operation in low-power modes. |
| EEPROM Size | 4kbit (512 × 8) organized as serial EEPROM with 16-byte page write capability. |
| I²C Interface | 400kHz maximum clock rate; compatible with standard-mode I²C controllers and bidirectional bus protocols. |
| Watchdog Timeout | Selectable 200ms / 600ms / 1.4s - provides scalable fault detection timing without external components. |
Pinout & Package
Package: 8-pin MSOP (Pb-free, RoHS compliant), 3.0mm × 3.0mm body, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left floating or grounded per layout guidelines. |
| 3 | RESET | Active-low open-drain reset output; requires external pull-up resistor; drives system reset line. |
| 4 | VSS | Ground reference for all internal circuits and I²C interface. |
| 5 | SDA | Bidirectional I²C data line; open-drain structure allows wired-AND with other slaves. |
| 6 | SCL | Input-only I²C clock line; synchronizes all serial transfers and watchdog monitoring. |
| 7 | WP | Hardware write protect input; HIGH disables all EEPROM and control register writes. |
| 8 | VCC | Main power supply input; powers reset logic, watchdog, EEPROM, and I²C interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power-on Reset + Brownout Detection | Guarantees 250ms reset hold on power-up and maintains RESET until VCC stabilizes above VTRIP for 200ms - prevents erratic MCU startup. |
| Programmable VTRIP Threshold | Factory-set at 4.5V–4.75V; adjustable via 15–18V pulse on WP pin - eliminates need for external resistive dividers in precision voltage monitoring. |
| Block Lock™ EEPROM Protection | Configurable lock of 0, 16, 32, 64, 128 bytes or 1/4/1/2/full array - prevents accidental firmware or calibration data corruption during field updates. |
| Self-timed EEPROM Writes | 5ms typical write cycle time with automatic internal timing - removes need for host-side delay management in bootloaders or configuration routines. |
| Watchdog Timer with SDA/SCL Monitoring | Detects I²C bus hang or MCU freeze by verifying clock/data transitions - triggers hardware reset without requiring dedicated watchdog pins or timers. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based PLC module operating in factory environments with fluctuating 5V supply rails and EMI-induced communication faults. IC Role / Device Role / Timing Role: X4043M8 provides power-on reset sequencing, brownout detection at 4.5V, and watchdog supervision of I²C sensor bus - ensuring deterministic startup and fail-safe shutdown. Use Value: Prevents spurious relay actuation during voltage sags and recovers from I²C bus lockups without manual intervention, meeting IEC 61000-4-2/4-4 immunity requirements. | Use Scenario: Portable ultrasound unit with battery-backed real-time clock and calibration parameter storage. IC Role / Device Role / Timing Role: X4043M8 supervises 5V DC-DC output, stores transducer calibration coefficients in protected EEPROM pages, and resets system if main processor hangs during image acquisition. Use Value: Enables 100-year data retention for calibration values and guarantees safe power-down when battery voltage drops below 4.5V - critical for FDA Class II device traceability. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: BCM managing door locks, lighting, and CAN gateway in 12V automotive systems with LDO-regulated 5V domain. IC Role / Device Role / Timing Role: X4043M8 monitors post-LDO 5V rail, asserts RESET during cranking-induced dips, and stores fault logs in EEPROM using Block Lock™ to prevent overwrite during transient events. Use Value: Maintains functional safety integrity during cold-crank (4.2V minimum) and ensures EEPROM write completion before power loss - supporting ISO 26262 ASIL-B diagnostic coverage. | Use Scenario: Revenue-grade electricity meter with tamper detection, time-of-use tariff storage, and firmware update rollback capability. IC Role / Device Role / Timing Role: X4043M8 supervises 5V meter SoC supply, protects tariff tables and cryptographic keys in locked EEPROM sectors, and resets meter core if firmware update fails verification. Use Value: Guarantees accurate billing data persistence across 10,000+ power cycles and enforces secure update validation via hardware-enforced write protection - compliant with ANSI C12.22 and IEC 62056. |
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 | 2.9V fixed reset threshold; no VTRIP programming; 1kbit EEPROM; SOIC-8 only | Lacks adjustable threshold and larger EEPROM - suitable only for fixed 2.9V brownout detection with minimal config storage | Select when design requires guaranteed 2.9V reset and lower BOM cost, but cannot accommodate X4043M8's programmability or 4kbit capacity. |
| STM802LSD-4.5F | 4.5V reset; no EEPROM; push-pull RESET; 3.5µA standby; SOIC-8/MSOP-8 | Provides basic reset supervision only - requires separate EEPROM for configuration storage | Choose when system already includes external I²C EEPROM and only needs low-quiescent reset functionality in same footprint. |
Compared with MAX6361KA29+T and STM802LSD-4.5F, the X4043M8 uniquely integrates programmable VTRIP, 4kbit Block Lock™ EEPROM, and watchdog timer in a single MSOP-8 device - reducing component count, PCB area, and qualification effort for systems requiring both robust supervision and secure nonvolatile storage.
Availability
X4043M8 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, smart energy meters, and embedded IoT gateways requiring stable component supply and long-term lifecycle support.
Supply support for X4043M8 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.
The X4043M8 belongs to Intersil's CPU Supervisor family, designed to consolidate reset, watchdog, voltage monitoring, and EEPROM functions into a single chip - targeting cost-sensitive, space-constrained embedded systems needing high reliability and field-programmable supervision parameters.
FAQ
What is the exact reset threshold voltage for X4043M8, and can it be changed?
The X4043M8 ships with a factory-set VTRIP threshold of 4.5V–4.75V, optimized for 5V systems. This value is fully programmable using a 15–18V pulse applied to the WP pin during a defined I²C sequence - enabling precise tuning for application-specific brownout margins without external components. The X4043M8 retains the programmed value across power cycles.
Does X4043M8 support both active-low and active-high reset outputs?
No - the X4043M8 provides only an active-low open-drain RESET output (pin 3). The datasheet confirms that the X4045 variant offers active-high RESET, but the X4043M8 is strictly active-low. An external inverter or pull-up configuration is required to generate active-high behavior, though this is not recommended for safety-critical paths.
How does the watchdog timer in X4043M8 detect microcontroller failure?
The X4043M8 watchdog monitors SDA and SCL pin transitions - not software commands. It triggers RESET if either line remains static (HIGH or LOW) beyond the selected timeout (200ms/600ms/1.4s), indicating I²C bus hang or MCU freeze. This hardware-level detection works independently of firmware execution and requires no periodic "kick" signal from the host.
What EEPROM protection mechanisms does X4043M8 provide beyond WP pin control?
In addition to the hardware WP pin, the X4043M8 implements Block Lock™ protection controlled by nonvolatile BP2/BP1/BP0 bits. These allow locking of 0, 16, 32, 64, or 128 bytes, or 1/4, 1/2, or full EEPROM array - preventing accidental writes during power-up/down or firmware updates. The X4043M8 also includes power-fail write inhibition: EEPROM writes abort automatically if VCC drops below VTRIP during programming.
Is X4043M8 pin-compatible with other packages in the X4043/X4045 family?
Yes - the X4043M8 (MSOP-8), X4043S8Z-4.5A (SOIC-8), and legacy X4043PZ-4.5A (PDIP-8) share identical pinout and electrical characteristics per the FN8118 datasheet. All three packages use the same 8-pin JEDEC mapping: pins 1–2 NC, 3 RESET, 4 VSS, 5 SDA, 6 SCL, 7 WP, 8 VCC. Layout migration between MSOP and SOIC requires only footprint adjustment - no schematic changes needed for X4043M8.
X4043M8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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:
- 8-MSOP
X4043M8 FAQ
1.How can I place an order for X4043M8 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043M8 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 X4043M8 reliable?
The price and inventory of X4043M8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043M8 is usually 5 days.
3.What payment methods are accepted for X4043M8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043M8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043M8?
X4043M8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043M8 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 X4043M8?
For technical support, including X4043M8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043M8 requirements.
6.How does Aetrix verify that X4043M8 is sourced from the original manufacturer or authorized distributors?
All X4043M8 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 X4043M8 meets industry standards.
7.What is the process for return or replacement of X4043M8?
All X4043M8 units undergo pre-shipment inspection (PSI). If there is an issue with X4043M8, 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 X4043M8 part is unused and in its original packaging.
Return procedure for X4043M8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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