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Renesas X4043S8Z-2.7
- Part No.:
- X4043S8Z-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8Z-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
X4043S8Z-2.7 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 SOIC package. It features active-low open-drain RESET output, 2.85V–3.0V reset threshold, 400kHz I²C interface, <20µA standby current (watchdog on), and block-lock EEPROM protection. It is used in microcontroller-based embedded systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4043S8Z-2.7 datasheet, X4043S8Z-2.7 pinout, X4043S8Z-2.7 application, or X4043S8Z-2.7 equivalent, key selection criteria include its 2.85–3.0V VTRIP range, 8-pin SOIC (Pb-free) package, I²C-compatible 2-wire serial interface, watchdog timeout configurability (200ms/600ms/1.4s), and EEPROM block-lock protection granularity down to 16 bytes.
Technical Context
The X4043S8Z-2.7 implements a dual-function reset architecture: power-on reset with 250ms delay and low-VCC detection asserting RESET below 2.85V (min), holding active until VCC exceeds VTRIP for 200ms. Its watchdog timer monitors SDA/SCL activity and triggers reset if no valid I²C transaction occurs within the selected timeout window.
Internally, it combines a precision bandgap-based voltage monitor, RC-based power-on timing circuit, state-machine-driven watchdog logic, and a CMOS EEPROM array using Direct Write™ cells (1M write cycles, 100-year retention). The control register at address 1FFh enables nonvolatile configuration of watchdog period and block-lock protection bits via a three-step write sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Range | 2.85V to 3.0V - precise brownout detection threshold for 2.7–5.5V supply systems |
| Reset Output | Active-low open-drain RESET - requires external pull-up; asserts during power-up, brownout, or watchdog timeout |
| I²C Interface | 400kHz max clock rate - supports standard-mode I²C bus communication with SDA/SCL pins |
| EEPROM Size | 4kbit (512 × 8) - organized as 16-byte pages; supports byte and page write modes |
| Standby Current | <20µA (watchdog enabled) - ultra-low quiescent draw for battery-backed or energy-sensitive applications |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - configured via nonvolatile WD1/WD0 bits in control register |
| Block Lock Protection | Configurable: 0, 16, 32, 64, 128, 256, 512, or full-array lock - prevents inadvertent writes without WP pin assertion |
Pinout & Package
Package: 8-pin JEDEC SOIC (Pb-free, RoHS compliant), 3.9mm × 4.9mm body, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left floating or grounded per layout best practice |
| 3 | RESET | Active-low open-drain reset output - drives system reset line; requires external pull-up resistor |
| 4 | VSS | Ground reference - primary return path for all internal circuits and I/O |
| 5 | SDA | Serial data bidirectional I/O - open-drain; shares bus with other I²C devices; requires pull-up |
| 6 | SCL | Serial clock input - master-generated clock synchronizing all I²C transfers |
| 7 | WP | Write protect input - HIGH disables all writes (EEPROM + control register); LOW enables write operations |
| 8 | VCC | Supply voltage input - powers entire device; operates from 2.7V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Voltage threshold can be adjusted in-system using 15–18V pulse on WP pin - enables fine-tuning for board-specific supply tolerances |
| Self-timed EEPROM writes | 5ms typical write cycle - eliminates need for host timing control; ACK polling confirms completion |
| Power-up/power-down write protection | Automatic disable of writes when VCC < VTRIP - prevents corruption during power ramping or brownout |
| Three-stage watchdog enable | Nonvolatile WD1/WD0 bits allow persistent timeout selection across power cycles - no reconfiguration required at boot |
| Flexible block-lock granularity | Eight protection modes from 16-byte page to full 512-byte array - supports secure parameter storage and firmware flag partitioning |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller monitoring analog inputs and driving relay outputs in factory automation. IC Role / Device Role: CPU supervisor providing power-on reset, brownout recovery, and watchdog safety monitoring - ensures deterministic startup and fault containment. Use Value: Prevents erratic operation during 24V DC supply fluctuations; stores calibration coefficients and runtime counters in protected EEPROM blocks. | Use Scenario: Portable patient vital sign monitor with battery backup, low-power sleep mode, and configurable alarm thresholds. IC Role / Device Role: System health manager asserting reset during Li-ion battery sag below 2.85V and logging event timestamps to EEPROM. Use Value: Guarantees safe shutdown before critical brownout; retains last-measured values and error logs even after complete power loss. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Revenue-grade electricity meter with tamper detection, time-of-use billing, and firmware update capability. IC Role / Device Role: Supervisory hub managing MCU reset integrity, detecting AC/DC supply faults, and storing tariff tables and metering registers. Use Value: Ensures accurate kWh accumulation during grid sags; block-locked EEPROM prevents unauthorized modification of billing parameters. | Use Scenario: CAN-connected vehicle subsystem controlling interior lighting, door locks, and window motors. IC Role / Device Role: Power management co-processor monitoring 12V battery voltage and resetting MCU during cranking-induced dips. Use Value: Maintains functional safety by asserting reset before MCU executes corrupted code; stores user preferences in EEPROM with 100-year retention. |
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 |
|---|---|---|---|
| MAX6375US29+T | Fixed 2.93V reset threshold; no VTRIP reprogramming; 1kbit EEPROM; same 8-pin SOIC package | Lacks field-adjustable trip point and larger EEPROM - suitable only where fixed threshold suffices and data storage needs are minimal | Select when design requires proven automotive-qualified part with AEC-Q100 Grade 3 rating but can accept fixed VTRIP and reduced memory |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2.5–5.5V operation; 2.7V reset threshold; 128B EEPROM; different 8-pin TSSOP package | Contains embedded processor - adds firmware flexibility but increases BOM complexity and validation scope | Choose when system-level watchdog logic or custom reset sequencing is needed beyond fixed-function supervision |
Compared with MAX6375US29+T and STM8T142M2U6, the X4043S8Z-2.7 uniquely balances field-programmable VTRIP, 4kbit EEPROM with granular block lock, and ultra-low standby current - making it optimal for cost-sensitive, space-constrained industrial designs requiring long-term data integrity and supply tolerance tuning.
Availability
X4043S8Z-2.7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, smart energy meters, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for X4043S8Z-2.7 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 high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.
The X4043/X4045 family was designed to consolidate reset, watchdog, voltage monitoring, and EEPROM functions into one die - reducing board area and improving system reliability in resource-constrained microcontroller applications.
FAQ
What is the exact reset threshold voltage range for X4043S8Z-2.7?
The X4043S8Z-2.7 has a factory-set VTRIP range of 2.85V to 3.0V, specified over 0°C to 70°C ambient temperature. This threshold is guaranteed to assert RESET when VCC falls below 2.85V and release it only after VCC rises above 3.0V and remains stable for 200ms. The threshold is reprogrammable in-system using a 15–18V pulse on the WP pin, enabling field calibration to match actual board-level supply behavior.
Does X4043S8Z-2.7 support I²C communication at standard speed?
Yes, X4043S8Z-2.7 supports standard-mode I²C communication up to 400kHz on its SDA and SCL pins. It uses a 7-bit slave address (1010xxx for EEPROM access, 1011xxx for control register access) and complies with I²C protocol timing requirements including start/stop conditions, acknowledge polling, and clock stretching avoidance. No external level-shifting is required for 3.3V or 5V I²C buses.
How does the watchdog timer in X4043S8Z-2.7 get reset?
The watchdog timer in X4043S8Z-2.7 is reset by any valid I²C transaction - specifically, a START condition followed by SCL low/high transitions and a STOP condition. A minimum four-instruction sequence (START → SCL low → SCL high → STOP) on the SDA/SCL lines restarts the timer. If no such activity occurs within the selected timeout (200ms/600ms/1.4s), X4043S8Z-2.7 asserts the RESET output to recover the host microcontroller.
Can the EEPROM in X4043S8Z-2.7 be protected against accidental writes?
Yes, X4043S8Z-2.7 provides multiple layers of EEPROM write protection: hardware WP pin assertion (HIGH disables all writes), power-up/power-down voltage monitoring (writes blocked when VCC < VTRIP), and software-configurable Block Lock™ protection. The latter allows locking 16-, 32-, 64-, or 128-byte segments, or up to the full 512-byte array, via nonvolatile BP2/BP1/BP0 bits in the control register.
What package type and lead finish does X4043S8Z-2.7 use?
X4043S8Z-2.7 is supplied in an 8-pin JEDEC-standard SOIC package (3.9mm × 4.9mm body, 1.27mm pitch) with Pb-free plus anneal termination - 100% matte tin plating compatible with both SnPb and Pb-free soldering processes. It meets RoHS Directive 2011/65/EU and is MSL Level 1 rated for moisture sensitivity.
X4043S8Z-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.62V
- 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-SOIC
X4043S8Z-2.7 FAQ
1.How can I place an order for X4043S8Z-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8Z-2.7 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 X4043S8Z-2.7 reliable?
The price and inventory of X4043S8Z-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043S8Z-2.7 is usually 5 days.
3.What payment methods are accepted for X4043S8Z-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8Z-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8Z-2.7?
X4043S8Z-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8Z-2.7 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 X4043S8Z-2.7?
For technical support, including X4043S8Z-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8Z-2.7 requirements.
6.How does Aetrix verify that X4043S8Z-2.7 is sourced from the original manufacturer or authorized distributors?
All X4043S8Z-2.7 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 X4043S8Z-2.7 meets industry standards.
7.What is the process for return or replacement of X4043S8Z-2.7?
All X4043S8Z-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8Z-2.7, 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 X4043S8Z-2.7 part is unused and in its original packaging.
Return procedure for X4043S8Z-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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