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Renesas X4043PZ-2.7A
- Part No.:
- X4043PZ-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4043PZ-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
X4043PZ-2.7A from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit serial EEPROM in a single 8-pin PDIP package. It operates from 2.7V to 5.5V, asserts active-low RESET down to VCC = 1V, supports 400kHz I²C interface, and delivers <1µA standby current with watchdog disabled - used in industrial microcontroller systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4043PZ-2.7A datasheet, X4043PZ-2.7A pinout, X4043PZ-2.7A application, or X4043PZ-2.7A equivalent, key selection criteria include its 2.85–3.0V reset threshold range, 8-pin PDIP through-hole package, EEPROM block-lock protection granularity, watchdog timeout configurability (200ms/600ms/1.4s), and compatibility with standard I²C timing and pull-up requirements.
Technical Context
The X4043PZ-2.7A implements a dual-function reset architecture: power-on reset holds RESET low for 250ms after VCC stabilization, while low-VCC detection asserts RESET when VCC drops below the factory-set 2.85–3.0V trip point and sustains it until VCC exceeds VTRIP for 200ms. Its watchdog circuit monitors SDA/SCL activity using a state machine that requires valid I²C start/stop sequences to reset - not simple clock toggling.
Internally, the device integrates a 512 × 8-bit EEPROM array with Direct Write™ cells (1M write cycles, 100-year retention), controlled via a 2-wire I²C-compatible interface. The control register at address 1FFh (accessed with slave ID 1011b) stores nonvolatile WD1/WD0 and BP2/BP1/BP0 bits, enabling programmable watchdog timeout and eight levels of block-lock protection - all managed under volatile WEL/RWEL latches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports single-supply operation across 3.3V and 5V logic domains without level shifting. |
| Reset Threshold (VTRIP) | 2.85V to 3.0V - factory-programmed for 3.0V nominal systems; reprogrammable to custom values using VP on WP pin. |
| RESET Assertion Validity | Down to VCC = 1V - ensures deterministic reset behavior during deep brownout or battery sag conditions. |
| Standby Current | <1µA with watchdog OFF - enables ultra-low-power operation in battery-backed or energy-harvesting applications. |
| EEPROM Capacity | 4kbit (512 × 8) - sufficient for storing calibration data, device IDs, or firmware revision metadata in embedded controllers. |
| I²C Interface Speed | 400kHz - compatible with Fast-mode I²C buses; supports standard pull-up resistor sizing (e.g., 2.2kΩ @ 3.3V). |
| Watchdog Timeout Options | 200ms / 600ms / 1.4s - selectable via nonvolatile WD1/WD0 bits; disabled by default (WD1=WD0=1). |
Pinout & Package
Package: 8-pin PDIP (Plastic Dual In-line Package), through-hole mounting, RoHS-compliant (Pb-free plus anneal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | No Connect (NC) | Unbonded die pads; must remain unconnected on PCB - no routing or grounding allowed. |
| 3 | RESET | Active-low open-drain reset output; requires external pull-up (e.g., 10kΩ to VCC); asserts during power-up, brownout, or watchdog timeout. |
| 4 | VSS | Ground reference for all internal circuits; must connect to system ground plane with low-inductance path. |
| 5 | SDA | Bidirectional I²C data line; open-drain structure mandates external pull-up; electrically compatible with other I²C slaves. |
| 6 | SCL | I²C clock input; driven only by master; no internal pull-up; tolerates standard 400kHz clock edge rates. |
| 7 | WP | Hardware write protect input; HIGH disables all EEPROM writes and control register updates; LOW enables software-controlled protection. |
| 8 | VCC | Primary power supply input; powers reset logic, watchdog, EEPROM, and I²C interface; decoupling capacitor (0.1µF ceramic) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set 2.85–3.0V threshold can be reprogrammed to custom values (e.g., 2.92V ±10mV) using 15–18V pulse on WP pin - eliminates need for external resistor dividers. |
| Block Lock™ Protection | Eight configurable protection modes (none, 16–128 bytes, upper 1/4/1/2, full array) controlled by nonvolatile BP2/BP1/BP0 bits - prevents accidental overwrites of critical calibration or security data. |
| Self-timed EEPROM Writes | 5ms typical write cycle time per byte/page; no external timing components required; acknowledge polling supported for host synchronization. |
| Power-Up/Down Write Protection | Automatic hardware lockout during VCC ramp-up and ramp-down phases - guarantees EEPROM integrity across power transitions without software intervention. |
| Watchdog Restart Protocol | Requires full I²C START → CLOCK LOW → CLOCK HIGH → STOP sequence (not just SCL toggling) - prevents false resets due to bus noise or spurious clock glitches. |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V supply rail in a DIN-rail mounted PLC I/O module exposed to wide ambient temperature swings and electrical transients. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout detection at 2.9V, and watchdog supervision of main MCU - ensures deterministic boot and safe shutdown during grid fluctuations. Use Value: Prevents corrupted I/O state during undervoltage events; EEPROM stores channel calibration coefficients with Block Lock™ protecting last 128 bytes from field updates. | Use Scenario: Embedded controller in a battery-powered infusion pump requiring fail-safe operation and long-term parameter retention. IC Role / Device Role / Timing Role: Integrates reset generation, watchdog monitoring, and nonvolatile storage for dosage history and motor calibration - all within single 8-pin PDIP footprint. Use Value: <1µA watchdog-OFF standby current extends battery life; RESET assertion down to 1V guarantees safe motor stop before battery depletion; EEPROM retains critical safety logs for regulatory audit. |
| Point-of-Sale Terminal Power Management | Smart Energy Meter Firmware Storage |
Use Scenario: AC-powered retail terminal with backup supercapacitor sustaining 3.3V rail during brief outages. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled MCU reset if voltage sags below 2.88V; EEPROM stores transaction log and tax table versions. Use Value: Eliminates need for discrete reset IC + separate EEPROM; Block Lock™ protects tax tables from unauthorized modification; 400kHz I²C enables fast log writes during high-throughput transactions. | Use Scenario: ANSI C12.22-compliant smart meter operating in harsh utility environments with wide temperature and EMI exposure. IC Role / Device Role / Timing Role: Provides tamper-resistant reset signaling and secure firmware version tracking via EEPROM with hardware write protection. Use Value: Factory-programmed 2.85–3.0V VTRIP matches meter's 3.0V LDO tolerance; 1M-cycle EEPROM endurance supports 10+ years of daily firmware updates; WP pin tied to secure microcontroller GPIO for dynamic lock control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V reset threshold; no VTRIP reprogramming; 1kbit EEPROM; SO-8 only | Lacks field-adjustable reset voltage and larger EEPROM capacity - suitable only where precise 2.93V trip is mandatory and storage needs are minimal | Select only if board uses SO-8 footprint and design requires guaranteed 2.93V ±1.5% trip without calibration flexibility |
| STM8T142M2U6 | 32-pin TSSOP; includes 16kB flash, 1kB RAM, and analog peripherals; reset threshold adjustable via internal DAC | Microcontroller-based solution requiring firmware development; higher BOM cost and layout complexity but offers programmable logic and ADC | Choose when system requires embedded processing beyond supervision - not a drop-in replacement; demands full firmware validation |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4043PZ-2.7A uniquely balances field-programmable reset voltage, 4kbit EEPROM with granular block lock, and through-hole PDIP packaging - making it optimal for cost-sensitive, maintenance-restricted industrial designs where hardware-level reliability and long-term data integrity are prioritized over programmability or integration.
Availability
X4043PZ-2.7A is available at Aetrix Electronics and suitable for industrial automation, medical device manufacturing, and smart metering applications requiring stable component supply and long-lifecycle support.
Supply support for X4043PZ-2.7A 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 Corporation (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and infrastructure markets.
The X4043PZ-2.7A belongs to Renesas' legacy CPU supervisor family designed specifically for embedded systems needing integrated reset, watchdog, and nonvolatile memory - emphasizing hardware reliability, low-power operation, and field-configurable voltage thresholds.
FAQ
What is the exact reset threshold voltage range for X4043PZ-2.7A?
The X4043PZ-2.7A is factory-programmed with a reset threshold (VTRIP) range of 2.85V to 3.0V, corresponding to a nominal 3.0V system. This value is stored in nonvolatile memory and can be reprogrammed to custom voltages using a 15–18V pulse on the WP pin - a capability confirmed in the FN8118 datasheet Section 5. The actual trip point is guaranteed to stabilize within 200ms after VCC exceeds VTRIP.
Does X4043PZ-2.7A support I²C Fast Mode Plus (1MHz)?
No, X4043PZ-2.7A supports only standard I²C Fast Mode at 400kHz, as explicitly stated in the Features section of the FN8118 datasheet. Its SDA and SCL input buffers, timing parameters (tBUF, tHD:STA), and internal clock generation are characterized only up to 400kHz. Attempting 1MHz operation may result in ACK failures or incomplete EEPROM writes due to insufficient setup/hold margins.
Can the watchdog timer in X4043PZ-2.7A be disabled permanently?
Yes, the watchdog timer in X4043PZ-2.7A can be disabled permanently by setting WD1=WD0=1 in the control register (address 1FFh), which is the factory-default state. This configuration persists across power cycles because WD1/WD0 are nonvolatile bits. Once set, the watchdog remains inactive until explicitly reconfigured - no external hardware modification is needed.
Is X4043PZ-2.7A pin-compatible with other X4043 variants like X4043S8Z-2.7A?
No, X4043PZ-2.7A is not pin-compatible with SOIC or MSOP variants such as X4043S8Z-2.7A. While all X4043 devices share identical pin functions, X4043PZ-2.7A uses an 8-pin PDIP package with 0.3-inch row spacing and through-hole leads, whereas X4043S8Z-2.7A uses an 8-pin SOIC with 1.27mm pitch and gull-wing surface-mount leads - requiring different PCB footprints and assembly processes.
What EEPROM protection mechanisms does X4043PZ-2.7A provide beyond WP pin control?
In addition to the hardware WP pin, X4043PZ-2.7A provides three layers of EEPROM protection: (1) Power-up/power-down automatic lockout preventing writes during VCC transients; (2) Block Lock™ protection configurable via BP2/BP1/BP0 bits to lock 16–128 bytes or upper quarters/half/full array; and (3) volatile WEL/RWEL latches requiring explicit software enable before any nonvolatile write - all documented in FN8118 Sections 5 and 9.
X4043PZ-2.7A 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:
- 2.92V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
X4043PZ-2.7A FAQ
1.How can I place an order for X4043PZ-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043PZ-2.7A 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 X4043PZ-2.7A reliable?
The price and inventory of X4043PZ-2.7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043PZ-2.7A is usually 5 days.
3.What payment methods are accepted for X4043PZ-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043PZ-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043PZ-2.7A?
X4043PZ-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043PZ-2.7A 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 X4043PZ-2.7A?
For technical support, including X4043PZ-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043PZ-2.7A requirements.
6.How does Aetrix verify that X4043PZ-2.7A is sourced from the original manufacturer or authorized distributors?
All X4043PZ-2.7A 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 X4043PZ-2.7A meets industry standards.
7.What is the process for return or replacement of X4043PZ-2.7A?
All X4043PZ-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4043PZ-2.7A, 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 X4043PZ-2.7A part is unused and in its original packaging.
Return procedure for X4043PZ-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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