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Renesas X4043PI-4.5A
- Part No.:
- X4043PI-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4043PI-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,843
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Product details
Overview
X4043PI-4.5A from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit EEPROM in a single 8-pin PDIP package. It provides active-low reset assertion at VCC < 4.5V, supports 400kHz I²C interface, delivers <1µA standby current with watchdog disabled, and operates across 0°C to 70°C. It is used in microcontroller-based embedded systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4043PI-4.5A datasheet, X4043PI-4.5A pinout, X4043PI-4.5A application, or X4043PI-4.5A equivalent, key selection criteria include its fixed 4.5–4.75V reset threshold, 8-pin PDIP package compatibility, EEPROM block-lock protection granularity, watchdog timeout configurability (200ms/600ms/1.4s), and guaranteed reset validity down to VCC = 1V.
Technical Context
The X4043PI-4.5A implements a dual-function reset architecture: power-on reset with 250ms delay and low-VCC detection with 200ms hysteresis, both asserting RESET active-low. Its watchdog timer monitors SDA/SCL activity using a state machine that requires valid I²C start/stop sequences to reset.
EEPROM operation uses Intersil's Direct Write™ cell technology, enabling 1,000,000 write cycles and 100-year data retention. Block Lock™ protection is controlled via nonvolatile BP2–BP0 bits, allowing selective write lock of 16-byte pages up to full array, while WP pin enables hardware-level write disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.5–4.75V - guarantees system reset before microcontroller enters undefined operation during brownout |
| Supply Range | 2.7–5.5V - supports wide-input industrial and legacy 5V systems without external regulation |
| EEPROM Size | 4kbit (512 × 8) - stores bootloader parameters, calibration data, or device identity in single-chip solution |
| I²C Speed | 400kHz - enables fast configuration reads/writes without slowing main processor bus |
| Standby Current | <1µA (watchdog OFF) - extends battery life in always-on monitoring nodes |
| Reset Validity | Down to VCC = 1V - ensures clean reset release even during deep undervoltage recovery |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - matches diverse firmware execution timing margins |
Pinout & Package
Package: 8-pin PDIP (Plastic Dual In-line Package), through-hole mount, RoHS-compliant Pb-free plus anneal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 NC | No internal connection | Unused pins - must be left floating or tied to GND per layout best practice |
| 3 RESET | Active-low open-drain reset output | Drives external pull-up; asserts during power-up, brownout, or watchdog timeout |
| 4 VSS | Ground reference | Primary return path for all internal circuits and I²C interface |
| 5 SDA | Serial Data bidirectional I²C line | Open-drain; requires external pull-up; carries address, command, and data traffic |
| 6 SCL | Serial Clock input | Master-generated clock synchronizing all I²C transfers |
| 7 WP | Hardware write protect input | High = disables all EEPROM and control register writes, including VTRIP programming |
| 8 VCC | Positive supply input | Power source for reset logic, watchdog, and EEPROM; monitored for threshold violation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set 4.5–4.75V threshold can be reprogrammed via high-voltage WP sequence for custom precision |
| Block Lock™ Protection | Eight configurable lock zones (16–128 bytes or full array) prevent accidental overwrites during field updates |
| Direct Write™ EEPROM | 1M-cycle endurance and 100-year retention enable long-life logging and calibration storage |
| Power-Fail Immunity | RESET remains asserted until VCC rises above VTRIP for 200ms, preventing partial writes during recovery |
| Low-Power Watchdog | Consumes <20µA standby current when enabled - suitable for energy-constrained edge devices |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Microcontroller executes real-time motor control and sensor sampling in factory automation cabinet with fluctuating 24V-derived 5V rail. IC Role / Device Role / Timing Role: X4043PI-4.5A monitors 5V supply, asserts RESET if voltage sags below 4.5V, and logs fault timestamps to EEPROM upon each brownout event. Use Value: Prevents erratic actuator behavior during line transients and preserves diagnostic history across power cycles without external memory. | Use Scenario: Battery-powered infusion pump runs safety-critical dosing algorithm with strict uptime requirements and periodic calibration updates. IC Role / Device Role / Timing Role: X4043PI-4.5A provides fail-safe reset on battery voltage decay and stores calibrated flow-rate coefficients in protected EEPROM blocks. Use Value: Ensures deterministic restart after low-battery shutdown and prevents corruption of life-critical calibration data during unexpected power loss. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Embedded ARM processor manages payment processing, display, and peripheral interfaces in retail kiosk exposed to unregulated AC adapters. IC Role / Device Role / Timing Role: X4043PI-4.5A generates clean power-on reset, detects adapter dropout, and retains transaction log entries in EEPROM with page-write efficiency. Use Value: Eliminates boot failures due to marginal input voltage and maintains audit trail integrity without host CPU intervention. | Use Scenario: Utility meter samples voltage/current waveforms and reports consumption data over PLC or RF link; must retain tamper events and billing cycles. IC Role / Device Role / Timing Role: X4043PI-4.5A supervises 3.3V LDO output, triggers watchdog if firmware hangs during communication, and stores metering registers in lock-protected EEPROM sectors. Use Value: Guarantees regulatory compliance by capturing power-loss events and preventing unauthorized parameter modification. |
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 |
|---|---|---|---|
| X4043S8Z-4.5A | Same core functionality and reset threshold, but in 8-pin SOIC package - no through-hole mounting | Preferred for automated PCB assembly; lacks PDIP's prototyping and serviceability advantages | Select when surface-mount manufacturing is required and board space is constrained |
| X4043M8Z-4.5A | Identical electrical specs and features, packaged in 8-pin MSOP - 3mm × 3mm footprint, thinner profile | Suitable for compact portable devices; requires fine-pitch reflow process, not hand-solderable | Choose for space-constrained consumer electronics where PDIP is mechanically incompatible |
Compared with X4043PI-4.5A, the SOIC and MSOP alternatives offer identical supervision and EEPROM performance but trade through-hole serviceability and manual assembly compatibility for smaller footprints and automated manufacturability - critical for volume production but limiting for field repair or lab validation.
Availability
X4043PI-4.5A is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, point-of-sale terminals, and smart metering applications requiring stable component supply and long-term obsolescence management.
Supply support for X4043PI-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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor designer specializing in precision analog, power management, and interface solutions for industrial and embedded markets.
The X4043/X4045 product line was engineered to consolidate reset, watchdog, voltage monitoring, and EEPROM into one die - reducing bill-of-materials cost and PCB area in resource-constrained microcontroller systems.
FAQ
What is the reset behavior of the X4043PI-4.5A during power-up?
The X4043PI-4.5A asserts its active-low RESET output for 250ms after VCC stabilizes above the 4.5–4.75V threshold. This ensures the microcontroller's oscillator and internal logic fully settle before code execution begins. The reset pulse is generated by an internal power-on reset circuit independent of external components, eliminating need for RC networks or discrete supervisors.
Can the X4043PI-4.5A's reset threshold voltage be adjusted?
Yes, the X4043PI-4.5A's VTRIP threshold can be reprogrammed using a high-voltage (15–18V) pulse applied to the WP pin during a defined I²C sequence. This allows fine-tuning to match precise system requirements beyond the factory-set 4.5–4.75V range. The procedure is nondestructive to EEPROM contents and documented in the FN8118 datasheet Section "VTRIP Programming".
How does the watchdog timer in the X4043PI-4.5A function?
The X4043PI-4.5A watchdog timer monitors SDA and SCL lines for valid I²C activity. It resets only upon detection of a complete start-stop sequence (four instruction states). Timeout is user-selectable via nonvolatile WD1/WD0 bits: 200ms, 600ms, 1.4s, or disabled. If no qualifying sequence occurs within the selected interval, RESET is asserted to force system recovery.
What EEPROM protection mechanisms does the X4043PI-4.5A provide?
The X4043PI-4.5A implements three-tiered EEPROM protection: (1) hardware WP pin - disables all writes when high; (2) Block Lock™ bits (BP2–BP0) - lock 16-byte to full-array segments; (3) power-fail detection - halts writes automatically when VCC drops below VTRIP. These layers prevent accidental or malicious corruption during development, deployment, or field updates.
Is the X4043PI-4.5A still in active production?
Per the FN8118 Rev 3.00 datasheet, X4043PI-4.5A is marked "No longer available, recommended replacement: X4043M8IZ-4.5A". However, Aetrix Electronics maintains legacy inventory and offers extended lifecycle support, including traceable sourcing and obsolescence mitigation planning for existing designs dependent on the 8-pin PDIP variant of X4043PI-4.5A.
X4043PI-4.5A 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:
- 4.62V
- 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-4.5A FAQ
1.How can I place an order for X4043PI-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043PI-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 X4043PI-4.5A reliable?
The price and inventory of X4043PI-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 X4043PI-4.5A is usually 5 days.
3.What payment methods are accepted for X4043PI-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043PI-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043PI-4.5A?
X4043PI-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043PI-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 X4043PI-4.5A?
For technical support, including X4043PI-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043PI-4.5A requirements.
6.How does Aetrix verify that X4043PI-4.5A is sourced from the original manufacturer or authorized distributors?
All X4043PI-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 X4043PI-4.5A meets industry standards.
7.What is the process for return or replacement of X4043PI-4.5A?
All X4043PI-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X4043PI-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 X4043PI-4.5A part is unused and in its original packaging.
Return procedure for X4043PI-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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