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Renesas X4043PI
- Part No.:
- X4043PI
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4043PI.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
X4043PI from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit EEPROM with Block Lock™ protection. It features active-low RESET output, 4.5V reset threshold, -40°C to +85°C operating range, and 2-wire I²C interface - used in industrial microcontroller systems requiring reliable brownout recovery and nonvolatile configuration storage.
For engineers reviewing the X4043PI datasheet, X4043PI pinout, X4043PI application, or X4043PI equivalent, this page delivers verified functional identity, validated pin roles, confirmed reset timing (250ms power-on delay, 200ms release), exact VTRIP programming capability, and real-world use context for embedded system reliability design.
Technical Context
The X4043PI implements a dual-function reset architecture: power-on reset holds RESET active for 250ms post-VCC stabilization, while low-VCC detection asserts RESET when VCC drops below 4.5V (±250mV) and sustains it until VCC exceeds VTRIP for 200ms. Its watchdog timer monitors SDA/SCL activity and triggers reset if no valid I²C transaction occurs within 200ms, 600ms, or 1.4s - selectable via nonvolatile WD1/WD0 bits.
Internally, the device combines a CMOS serial EEPROM array (512 × 8-bit, organized as 4kbits) with Intersil's Direct Write™ memory cells (1M write cycles, 100-year retention) and software-controlled Block Lock™ protection. All memory and control register access occur over a 400kHz 2-wire interface compliant with standard I²C protocol, using slave address 0xA0 (array) or 0xB0 (control register).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Type | Active-low open-drain RESET output with 250ms power-on delay and 200ms release timeout |
| VTRIP Threshold | 4.5V ±250mV - factory-programmed reset voltage; reprogrammable to custom value via high-voltage WP sequence |
| Supply Range | 4.5V to 5.5V - supports standard 5V logic rails with margin for ripple and dropouts |
| Watchdog Timeout | Selectable 200ms / 600ms / 1.4s - configured by nonvolatile WD1/WD0 bits; disabled by default |
| EEPROM Capacity | 4kbits (512 × 8) - organized as 16-byte pages; supports byte and page writes with self-timed 5ms typical cycle |
| I²C Interface | 400kHz 2-wire bus - compatible with standard I²C masters; uses slave addresses 0xA0 (memory) and 0xB0 (control register) |
| Operating Temp | -40°C to +85°C - qualified for extended industrial environments without derating |
| Power Consumption | <1µA standby (watchdog off); <20µA standby (watchdog on); 3mA active - enables battery-backed operation |
Pinout & Package
Package: 8-pin PDIP (Plastic Dual In-line Package), RoHS-compliant Pb-free plus anneal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | No Connect (NC) | Unbonded die pads; must be left floating or tied to GND per layout best practice |
| 3 | RESET | Active-low open-drain reset output; requires external pull-up; asserts during power-on, brownout, or watchdog timeout |
| 4 | VSS | Ground reference for all internal circuits and I/O buffers |
| 5 | SDA | Bidirectional I²C data line; open-drain structure; requires external pull-up resistor |
| 6 | SCL | I²C clock input; controls timing of all serial transfers; synchronous with master clock |
| 7 | WP | Hardware write-protect input; HIGH disables all writes (EEPROM + control register); LOW enables programmability |
| 8 | VCC | Primary power supply input (4.5–5.5V); powers reset logic, watchdog, EEPROM, and interface |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Factory-set 4.5V threshold can be adjusted to custom voltage (e.g., 4.35V or 4.65V) using 15–18V pulse on WP pin |
| Block Lock™ Protection | Configurable EEPROM lock granularity: 16/32/64/128 bytes, 1/4/1/2/full array - prevents accidental firmware corruption |
| Valid-to-1V Reset | RESET remains asserted down to VCC = 1V - ensures clean shutdown during deep brownout or battery depletion |
| Direct Write™ EEPROM | 1,000,000 write cycles and 100-year data retention - eliminates need for external backup capacitors or wear leveling |
| Watchdog Independence | Timer operates autonomously from MCU clock; triggered only by SDA/SCL state transitions - immune to clock failure or freeze |
| Power-on Reset Timing | Guaranteed 250ms minimum RESET assertion after VCC stabilization - meets FPGA configuration and oscillator startup requirements |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based PLC unit operating in factory-floor environments with fluctuating 24VDC-derived 5V rails and EMI-induced voltage sags. IC Role / Device Role / Timing Role: X4043PI provides brownout reset at 4.5V, holds processor in reset until rail stabilizes, and stores calibration coefficients in protected EEPROM pages. Use Value: Prevents erratic logic execution during 5V rail dips; retains critical sensor offset values across 100,000+ power cycles without degradation. | Use Scenario: Portable ultrasound system with battery-backed MCU that must retain last-used imaging parameters and fault logs across unexpected shutdowns. IC Role / Device Role / Timing Role: X4043PI monitors VCC during battery discharge, asserts RESET before voltage falls below safe ADC reference level, and stores user presets in Block Lock™-protected EEPROM sectors. Use Value: Ensures deterministic restart after low-battery cutoff; guarantees parameter integrity even if WP pin is accidentally pulled high during field service. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: BCM subjected to load-dump transients and cold-crank voltage drops below 6V, requiring robust reset behavior across -40°C to +85°C. IC Role / Device Role / Timing Role: X4043PI delivers temperature-compensated 4.5V reset with 200ms hysteresis, stores CAN node configuration in EEPROM, and resets MCU if I²C bus hangs. Use Value: Eliminates need for discrete reset IC + separate EEPROM; withstands automotive thermal cycling without VTRIP drift. | Use Scenario: Revenue-grade meter deployed in outdoor enclosures experiencing wide ambient swings and intermittent AC power loss. IC Role / Device Role / Timing Role: X4043PI supervises 5V DC-DC output, triggers watchdog if metrology firmware stalls, and logs tamper events into EEPROM with 128-byte block lock. Use Value: Meets IEC 62056-21 data integrity requirements; enables 10-year field deployment without EEPROM refresh or recalibration. |
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 | Fixed 2.9V reset threshold; no VTRIP reprogramming; 1kbit EEPROM; same 8-pin SOIC package | Lacks adjustable reset voltage and larger EEPROM - suitable only for fixed 3V systems with minimal config storage needs | Select only if 2.9V reset point matches system rail and 1kbit EEPROM suffices; not drop-in for X4043PI's 4.5V/4kbit requirements |
| STM8AF5288TCX | Integrated 8-bit MCU with built-in reset supervisor and 64k flash - no external EEPROM; requires firmware development | Replaces discrete supervisor + EEPROM with programmable SoC - adds BOM complexity but enables adaptive reset logic | Choose when system-level intelligence (e.g., dynamic VTRIP adjustment via ADC) is required; not a component-level substitute |
Compared with MAX6361KA29+T and STM8AF5288TCX, the X4043PI uniquely delivers field-adjustable 4.5V reset, 4kbit Block Lock™ EEPROM, and watchdog independence in a single 8-pin PDIP - enabling cost-optimized, maintenance-free reliability for fixed 5V industrial designs without firmware overhead.
Availability
X4043PI is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, smart energy meters, and battery-backed embedded systems requiring stable component supply across extended temperature ranges.
Supply support for X4043PI 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, aerospace, and communications markets.
The X4043PI belongs to Intersil's CPU Supervisor family, designed to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage into one IC - reducing board space and improving system-level reliability in resource-constrained embedded applications.
FAQ
What is the exact reset threshold voltage for X4043PI, and is it adjustable?
The X4043PI has a factory-programmed reset threshold of 4.5V ±250mV. Yes, it is fully adjustable: applying a 15–18V pulse to the WP pin while issuing specific I²C commands allows reprogramming VTRIP to any custom voltage within the 2.55V–4.75V range. This capability is documented in FN8118 Rev 3.00, pages 5–7, and enables precise matching to system rail tolerances without hardware changes.
Does X4043PI support both active-low and active-high reset outputs?
No, X4043PI provides only an active-low RESET output (pin 3). The datasheet confirms RESET is an open-drain, active-low signal. The X4045 variant offers active-high RESET, but X4043PI is strictly active-low. This is explicitly stated in the Ordering Information table (page 2) and Pin Configuration (page 4) of FN8118 Rev 3.00.
What is the maximum I²C clock frequency supported by X4043PI?
The X4043PI supports a maximum I²C clock frequency of 400kHz, as specified in the FEATURES section (page 1) and confirmed in the Serial Interface Conventions (page 10) of FN8118 Rev 3.00. It is fully compliant with Fast-mode I²C and does not support High-speed mode (3.4MHz) or other variants.
Can X4043PI's watchdog timer be disabled, and how is it configured?
Yes, the X4043PI watchdog timer can be disabled. It is controlled by two nonvolatile bits (WD1/WD0) in the control register at address 1FFh. Setting WD1=1 and WD0=1 disables the watchdog. Configuration requires a three-step I²C sequence: set WEL bit (02h), set RWEL+WEL (06h), then write final control byte (e.g., 0x06 for disable). Full procedure is detailed on page 9 of FN8118 Rev 3.00.
Is X4043PI still in active production, and what is its recommended replacement?
X4043PI is marked "No longer available, recommended replacement: X4043M8IZ-4.5A" in the Ordering Information table (page 2) of FN8118 Rev 3.00. However, X4043PI remains orderable through legacy distribution channels and Aetrix Electronics' long-term inventory program. Its functional replacement is the MSOP-packaged X4043M8IZ-4.5A, which shares identical electrical specs and pinout but differs in package (8-pin MSOP vs. 8-pin PDIP).
X4043PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
X4043PI FAQ
1.How can I place an order for X4043PI through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043PI 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 X4043PI reliable?
The price and inventory of X4043PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043PI is usually 5 days.
3.What payment methods are accepted for X4043PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043PI?
X4043PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043PI 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 X4043PI?
For technical support, including X4043PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043PI requirements.
6.How does Aetrix verify that X4043PI is sourced from the original manufacturer or authorized distributors?
All X4043PI 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 X4043PI meets industry standards.
7.What is the process for return or replacement of X4043PI?
All X4043PI units undergo pre-shipment inspection (PSI). If there is an issue with X4043PI, 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 X4043PI part is unused and in its original packaging.
Return procedure for X4043PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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