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Renesas X4043S8-2.7T1
- Part No.:
- X4043S8-2.7T1
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8-2.7T1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
X4043S8-2.7T1 from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit serial EEPROM with Block Lock™ protection. 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 microcontroller-based embedded systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4043S8-2.7T1 datasheet, X4043S8-2.7T1 pinout, X4043S8-2.7T1 application, or X4043S8-2.7T1 equivalent, key selection criteria include its 2.55–2.7V reset threshold range, 8-pin SOIC package, 200ms reset timeout, programmable VTRIP, and integrated EEPROM write-protection architecture.
Technical Context
The X4043S8-2.7T1 implements a dual-function reset architecture: power-on reset (250ms assertion) and low-VCC detection with hysteresis, asserting RESET/RESET 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.
It embeds a 512 × 8-bit EEPROM array using Direct Write™ cells (1M endurance, 100-year retention), organized into 16-byte pages with self-timed 5ms typical write cycles. Block Lock™ protection is controlled by BP2–BP0 bits, enabling selective lock of 16–512 bytes or full array, while WP pin provides hardware-level write inhibit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports single-supply operation across wide industrial voltage rails. |
| Reset Threshold (VTRIP) | 2.55V to 2.7V - factory-programmed range for precise brownout detection at low-voltage logic levels. |
| Reset Timeout (tPURST) | 250ms (power-up), 200ms (low-VCC recovery) - ensures stable power and oscillator settling before MCU release. |
| I²C Interface Speed | 400kHz - enables fast configuration read/write without bus contention in resource-constrained systems. |
| EEPROM Capacity | 4kbits (512 × 8) - stores calibration data, device ID, or firmware parameters in compact serial memory. |
| Standby Current | <1µA (watchdog OFF) - extends battery life in always-on monitoring applications. |
| Watchdog Timeout Options | 200ms / 600ms / 1.4s - configurable via nonvolatile control register for flexible MCU fault response timing. |
Pinout & Package
Package: 8-pin JEDEC SOIC (Pb-free, RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected or tied to GND per layout guidelines. |
| 3 | RESET | Active-low open-drain reset output - requires external pull-up; asserts during power-up, brownout, or watchdog timeout. |
| 4 | VSS | Ground reference - common return path for all internal circuits and I²C bus termination. |
| 5 | SDA | Bidirectional I²C data line - open-drain, wire-OR capable; used for EEPROM read/write and control register access. |
| 6 | SCL | I²C clock input - synchronizes all serial transfers; master-generated, edge-triggered timing source. |
| 7 | WP | Hardware write protect - HIGH disables all writes including EEPROM and control register; LOW enables programming. |
| 8 | VCC | Power supply input - powers all internal blocks including reset generator, watchdog, and EEPROM core. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set 2.55–2.7V threshold can be reprogrammed to custom values (≥1.7V) using 15–18V pulse on WP pin - eliminates need for external resistor dividers. |
| Block Lock™ EEPROM Protection | Eight protection modes (0–128 bytes to full array) controlled by nonvolatile BP2–BP0 bits - prevents accidental overwrites during field updates. |
| Self-Timed EEPROM Writes | 5ms typical write cycle with automatic internal timing - removes software delay requirements and simplifies firmware design. |
| Low-VCC Reset Validity | RESET remains asserted down to VCC = 1V - guarantees safe shutdown even during deep brownout conditions. |
| Watchdog Independence | Monitors SDA/SCL state transitions (not instruction count) - detects MCU lockup regardless of software state or clock source failure. |
Applications
| Industrial PLC Controller | Medical Sensor Module |
|---|---|
Use Scenario: Microcontroller in a programmable logic controller monitors analog inputs and executes safety-critical ladder logic. IC Role / Device Role / Timing Role: X4043S8-2.7T1 provides power-on reset, brownout reset, and watchdog supervision - ensuring deterministic startup and fail-safe shutdown. Use Value: Prevents erratic behavior during AC line sags by asserting RESET below 2.7V and restarting watchdog after each I²C command, guaranteeing system integrity. | Use Scenario: Portable blood glucose meter uses an ultra-low-power MCU to sample sensor data and store calibration coefficients. IC Role / Device Role / Timing Role: X4043S8-2.7T1 supervises 3.0V coin-cell supply and stores calibration offsets in its EEPROM with Block Lock™ enabled for first 16 bytes. Use Value: Achieves <1µA standby current with watchdog off and retains calibration data for >100 years - extending device shelf life and field reliability. |
| Automotive Body Control Unit | Smart Energy Meter |
Use Scenario: BCM manages door locks, lighting, and CAN communication in 12V automotive systems with wide input transients. IC Role / Device Role / Timing Role: X4043S8-2.7T1 acts as secondary supervisor alongside main PMIC - monitoring local 3.3V rail and resetting MCU during load-dump-induced dips. Use Value: Resets MCU within 200ms of VCC recovery above 2.7V, preventing corrupted EEPROM writes during transient events. | Use Scenario: Revenue-grade electricity meter logs tamper events and firmware version history in nonvolatile memory. IC Role / Device Role / Timing Role: X4043S8-2.7T1 stores event timestamps and cryptographic keys in protected EEPROM pages, while its watchdog guards against meter firmware hangs. Use Value: Enables 1M write cycles and 100-year data retention - meeting ANSI C12.22 and IEC 62056 long-term logging requirements. |
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 |
|---|---|---|---|
| MAX6373US27+T | 2.7V reset threshold, 256-byte EEPROM, no programmable VTRIP, 1.6V min VCC operation | Lacks VTRIP reprogramming and 4kbit capacity - suitable only for basic reset + small config storage | Select when minimal footprint and lowest cost outweigh EEPROM size and threshold flexibility needs. |
| STM8T142M2U6 | 2.7V reset, 128-byte EEPROM, integrated window watchdog, 3.3V-only supply | Microcontroller-based solution with embedded watchdog - requires firmware development and lacks serial EEPROM scalability | Choose when system already uses STM8 and firmware-controlled supervision is preferred over dedicated hardware. |
Compared with MAX6373US27+T and STM8T142M2U6, the X4043S8-2.7T1 uniquely combines factory-trimmed 2.55–2.7V reset accuracy, field-reprogrammable VTRIP, 4kbit EEPROM with granular Block Lock™, and true 2.7–5.5V operation - making it optimal for systems requiring robust, field-adaptable supervision with high-density nonvolatile storage.
Availability
X4043S8-2.7T1 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply and long-term lifecycle support.
Supply support for X4043S8-2.7T1 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, communications, and computing markets.
The X4043/X4045 product line was designed to consolidate power supervision, watchdog, and EEPROM functions into a single 8-pin package - reducing board space and improving system reliability in cost-sensitive embedded controllers.
FAQ
What is the factory-programmed reset threshold voltage for X4043S8-2.7T1?
The X4043S8-2.7T1 is factory-programmed with a nominal reset threshold (VTRIP) range of 2.55V to 2.7V. This value is guaranteed across temperature and supply conditions and remains stable over time unless reprogrammed using the documented VTRIP adjustment sequence. The actual trip point is verified during final test and falls within this specified band.
Does X4043S8-2.7T1 support I²C standard-mode or fast-mode operation?
X4043S8-2.7T1 supports Fast-mode I²C operation at up to 400kHz. Its SDA and SCL pins meet I²C bus electrical specifications for open-drain operation, including rise/fall time limits and noise immunity. The device acknowledges standard 7-bit slave addresses (0xA0 for write, 0xA1 for read) and responds correctly to repeated start conditions.
Can the watchdog timer in X4043S8-2.7T1 be disabled after power-up?
Yes, the watchdog timer in X4043S8-2.7T1 can be disabled after power-up by writing WD1=1 and WD0=1 to the control register (address 0x1FF). This setting persists across power cycles and remains active until explicitly changed. Disabling the watchdog reduces standby current to <1µA but removes fault-detection capability.
How does the Block Lock™ protection work on the EEPROM in X4043S8-2.7T1?
Block Lock™ protection in X4043S8-2.7T1 is controlled by three nonvolatile BP2–BP0 bits in the control register. These bits select one of eight protection modes - from locking just the first 16 bytes (page 1) to protecting the entire 512-byte array. When enabled, writes to locked regions are ignored and generate no acknowledge, preserving critical configuration data.
Is X4043S8-2.7T1 pin-compatible with other members of the X4043/X4045 family?
Yes, X4043S8-2.7T1 is pin-compatible with all X4043 and X4045 variants in the same 8-pin SOIC package, including X4043S8Z-4.5A and X4043S8IZ-2.7A. Pin functions (RESET, VSS, SDA, SCL, WP, VCC) and physical layout match exactly - allowing direct substitution where voltage threshold and temperature range requirements align.
X4043S8-2.7T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
X4043S8-2.7T1 FAQ
1.How can I place an order for X4043S8-2.7T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8-2.7T1 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 X4043S8-2.7T1 reliable?
The price and inventory of X4043S8-2.7T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043S8-2.7T1 is usually 5 days.
3.What payment methods are accepted for X4043S8-2.7T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8-2.7T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8-2.7T1?
X4043S8-2.7T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8-2.7T1 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 X4043S8-2.7T1?
For technical support, including X4043S8-2.7T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8-2.7T1 requirements.
6.How does Aetrix verify that X4043S8-2.7T1 is sourced from the original manufacturer or authorized distributors?
All X4043S8-2.7T1 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 X4043S8-2.7T1 meets industry standards.
7.What is the process for return or replacement of X4043S8-2.7T1?
All X4043S8-2.7T1 units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8-2.7T1, 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 X4043S8-2.7T1 part is unused and in its original packaging.
Return procedure for X4043S8-2.7T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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