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Renesas X4043PIZ
- Part No.:
- X4043PIZ
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4043PIZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,888
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Product details
Overview
X4043PIZ 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–4.75V VTRIP threshold, -40°C to +85°C operating range, and 400kHz I²C interface - used in industrial microcontroller systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4043PIZ datasheet, X4043PIZ pinout, X4043PIZ application, or X4043PIZ equivalent, key selection considerations include its PDIP-8 package, programmable VTRIP, watchdog timeout options (200ms/600ms/1.4s), EEPROM endurance (1M cycles), and compatibility with legacy 5V embedded designs requiring discrete reset + memory integration.
Technical Context
The X4043PIZ 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 stable. Its watchdog timer monitors SDA/SCL activity using a state-machine-based transition detector - not clocked by external crystal but derived from internal timebase logic.
EEPROM operation uses Intersil's Direct Write™ cell technology with 16-byte page write mode and self-timed 5ms typical write cycle. Block Lock™ protection is controlled via nonvolatile BP2/BP1/BP0 bits in the control register (address 1FFh), enabling selective write lock of 16–128 byte segments or full array - independent of WP pin status when configured.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.5V–4.75V nominal; factory-programmed for 4.5A variant; reprogrammable via high-voltage sequence on WP pin |
| Reset Output Polarity | Active-low open-drain RESET; requires external pull-up; asserted during power-up, brownout, or watchdog timeout |
| EEPROM Capacity | 4kbit (512 × 8); organized as single array; supports byte and 16-byte page writes |
| I²C Interface Speed | 400kHz maximum; compatible with standard-mode I²C buses; SDA/SCL pins support wired-AND topology |
| Supply Voltage Range | 4.5V to 5.5V; operates down to 1V for RESET assertion validity - ensures fail-safe behavior during deep brownout |
| Watchdog Timeout Options | Selectable via WD1/WD0 bits: 200ms, 600ms, 1.4s, or disabled; nonvolatile setting retained across power cycles |
| Standby Current | <1µA with watchdog OFF; <20µA with watchdog ON - enables ultra-low-power system monitoring |
Pinout & Package
Package: 8-pin PDIP (Plastic Dual In-line Package), RoHS-compliant Pb-free plus anneal finish, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 NC | No internal connection | Unbonded die pads; must be left floating or tied to GND per layout best practice - no electrical function |
| 3 RESET | Active-low reset output | Open-drain driver; sinks current when asserted; requires external pull-up resistor (typically 4.7kΩ to VCC) |
| 4 VSS | Ground reference | Primary return path for all internal circuits; must be connected to system ground plane with low-inductance trace |
| 5 SDA | Serial data bidirectional line | Open-drain I²C bus line; shares bus with other slaves; requires pull-up; input buffer always enabled |
| 6 SCL | Serial clock input | Master-generated clock; edge-triggered timing reference for all I²C transactions; no internal pull-up |
| 7 WP | Hardware write protect | Active-high; disables all EEPROM and control register writes when HIGH; tied to VSS if unused |
| 8 VCC | Power supply input | 4.5–5.5V nominal; powers all internal blocks including reset generator, watchdog, and EEPROM core |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set at 4.5V–4.75V; adjustable via 15–18V pulse on WP pin - enables precision brownout tuning without component change |
| Block Lock™ EEPROM Protection | Eight configurable lock modes (0–128 bytes or full array) controlled by nonvolatile BP bits - prevents accidental firmware corruption during field updates |
| Self-timed EEPROM Writes | 5ms typical internal write cycle; no external timing control needed - simplifies host firmware and eliminates write-time polling overhead |
| Watchdog with State-Based Detection | Monitors SDA/SCL transitions (not clock frequency); immune to bus noise or clock stretching - robust against MCU lockup in noisy environments |
| Power-Fail Reset Validity to 1V | RESET remains asserted down to VCC = 1V - guarantees deterministic shutdown even during catastrophic rail collapse |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based PLC module operating in factory-floor environments with fluctuating 5V supply rails and EMI exposure. IC Role / Device Role / Timing Role: X4043PIZ provides power-on reset sequencing, brownout detection at 4.5V threshold, and watchdog supervision - ensuring deterministic boot and recovery from transient faults. Use Value: Prevents spurious relay actuation or I/O misreads during voltage sags; EEPROM stores calibrated sensor offsets with Block Lock™ preventing overwrite during firmware update. | Use Scenario: Portable ultrasound unit with battery-backed 5V rail and safety-critical boot integrity requirements. IC Role / Device Role / Timing Role: X4043PIZ delivers fail-safe reset assertion down to 1V VCC, monitors MCU health via watchdog, and retains calibration data in EEPROM across power cycles. Use Value: Guarantees safe shutdown before critical subsystems (e.g., transducer drivers) operate outside spec; EEPROM retention >100 years ensures lifetime calibration persistence. |
| Legacy Industrial HMI Panel | Automotive Test Equipment |
Use Scenario: Retrofit HMI panel using aging 8051-based controller with minimal board space and no redesign budget. IC Role / Device Role / Timing Role: X4043PIZ replaces discrete reset IC + 24LC04B EEPROM in PDIP-8 footprint - maintaining through-hole assembly and 5V compatibility. Use Value: Reduces BOM count by 2 components; identical pinout to legacy SOIC variants allows direct socket replacement in existing PDIP sockets. | Use Scenario: Benchtop OBD-II diagnostic tool requiring reliable firmware update rollback and supply monitoring during vehicle battery testing. IC Role / Device Role / Timing Role: X4043PIZ supervises 5V DC-DC output, triggers watchdog reset on communication stall, and stores last-known-good firmware hash in EEPROM. Use Value: Enables atomic firmware updates with EEPROM-based version tracking; VTRIP reprogramming allows fine-tuning for 12V battery ripple profiles. |
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 |
|---|---|---|---|
| MAX6361LKA29+T | Fixed 2.9V reset threshold; no EEPROM; 3-pin SOT23 package; no VTRIP programming | Only provides reset + watchdog - lacks integrated memory for configuration storage | Choose only if EEPROM is implemented separately and precise 2.9V brownout is required |
| STM8S003F3P6 | 8-bit MCU with built-in 128B EEPROM and reset controller; requires external crystal; 20-pin TSSOP | Software-configurable reset logic and watchdog; no dedicated VTRIP programming circuitry | Use when firmware-level adaptability (e.g., dynamic timeout adjustment) outweighs need for hardware-level VTRIP tuning |
Compared with MAX6361LKA29+T and STM8S003F3P6, the X4043PIZ uniquely combines factory-programmed 4.5V VTRIP, reprogrammable threshold, 4kbit EEPROM with Block Lock™, and PDIP-8 compatibility - making it optimal for cost-sensitive, space-constrained 5V industrial retrofits requiring guaranteed hardware-level reset integrity.
Availability
X4043PIZ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, legacy HMI panels, automotive test equipment, and portable instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for X4043PIZ 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 power management, precision analog, and interface ICs for industrial, computing, and communications markets.
The X4043/X4045 family was designed to consolidate reset supervision, watchdog protection, and nonvolatile memory into a single IC - targeting cost-sensitive, reliability-critical embedded systems where board space and BOM count reduction are primary design constraints.
FAQ
What is the exact reset threshold voltage for X4043PIZ?
The X4043PIZ is specified with a VTRIP range of 4.5V to 4.75V for the "-4.5A" variant, as confirmed in the FN8118 datasheet ordering table. This threshold is factory-programmed and can be reprogrammed using a 15–18V pulse on the WP pin. The device asserts RESET when VCC falls below this threshold and holds it active until VCC rises above VTRIP for ≥200ms.
Does X4043PIZ support I²C communication at 400kHz?
Yes, X4043PIZ supports standard-mode I²C up to 400kHz, as explicitly stated in the FEATURES section of the FN8118 datasheet. Its SDA and SCL pins comply with I²C bus electrical specifications, including open-drain outputs and required timing parameters - enabling interoperability with common microcontrollers and I²C masters without speed negotiation.
Can the watchdog timeout period of X4043PIZ be changed after soldering?
Yes, the watchdog timeout period of X4043PIZ is configurable via nonvolatile WD1/WD0 bits in the control register (address 1FFh). These bits retain their state across power cycles and can be rewritten using the documented three-step write sequence - allowing field-adjustment of timeout values (200ms/600ms/1.4s/disable) without hardware modification.
Is X4043PIZ still in active production or obsolete?
The X4043PIZ is marked "No longer available, recommended replacement: X4043M8IZ-4.5A" in the FN8118 datasheet ordering table. However, Aetrix Electronics maintains legacy inventory and offers extended supply support, including traceable sourcing and lifecycle coordination - ensuring continuity for existing designs dependent on the PDIP-8 package and -40°C to +85°C temperature grade.
How does EEPROM write protection work on X4043PIZ?
X4043PIZ implements dual-layer EEPROM write protection: hardware-based via the WP pin (active-high disable), and software-configurable via Block Lock™ bits (BP2/BP1/BP0) in the control register. These bits define eight lock modes - from protecting just the first 16 bytes to locking the entire 512-byte array - and remain nonvolatile across power cycles, preventing accidental overwrites during firmware updates or field service.
X4043PIZ 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
X4043PIZ FAQ
1.How can I place an order for X4043PIZ through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043PIZ 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 X4043PIZ reliable?
The price and inventory of X4043PIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043PIZ is usually 5 days.
3.What payment methods are accepted for X4043PIZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043PIZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043PIZ?
X4043PIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043PIZ 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 X4043PIZ?
For technical support, including X4043PIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043PIZ requirements.
6.How does Aetrix verify that X4043PIZ is sourced from the original manufacturer or authorized distributors?
All X4043PIZ 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 X4043PIZ meets industry standards.
7.What is the process for return or replacement of X4043PIZ?
All X4043PIZ units undergo pre-shipment inspection (PSI). If there is an issue with X4043PIZ, 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 X4043PIZ part is unused and in its original packaging.
Return procedure for X4043PIZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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