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Renesas X4043S8IZ-2.7
- Part No.:
- X4043S8IZ-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8IZ-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,082
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Product details
Overview
X4043S8IZ-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit serial EEPROM with Block Lock™ protection. It features active-low open-drain RESET output, 2.7V–5.5V operation, 2.85V–3.0V reset threshold, -40°C to +85°C temperature range, and 400kHz I²C interface - deployed in industrial microcontroller systems requiring reliable brownout recovery and nonvolatile configuration storage.
For engineers reviewing the X4043S8IZ-2.7 datasheet, X4043S8IZ-2.7 pinout, X4043S8IZ-2.7 application, or X4043S8IZ-2.7 equivalent, this page delivers verified functional identity, exact reset threshold behavior, EEPROM block-lock granularity, watchdog timeout options, and validated alternative parts for design continuity and sourcing resilience.
Technical Context
The X4043S8IZ-2.7 implements a dual-stage reset architecture: power-on reset asserts RESET for ≥250ms after VCC stabilization, while low-VCC detection holds RESET active until VCC exceeds 2.85V and remains stable for ≥200ms. Its watchdog timer monitors SDA/SCL activity and triggers reset if no valid I²C transaction occurs within user-selectable intervals (200ms/600ms/1.4s or disabled).
Internally, it combines a 512 × 8-bit EEPROM array using Direct Write™ cells (1M write cycles, 100-year retention) with software-configurable Block Lock™ protection (16/32/64/128-byte or quarter/half/full array lock), all managed via a standard 2-wire I²C interface operating up to 400kHz with open-drain SDA/SCL and external pull-ups.
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 trip point ensures deterministic reset assertion during 3.3V system brownout. |
| RESET Output | Active-low, open-drain - requires external pull-up; asserts at VCC < VTRIP and releases only after VCC > VTRIP for ≥200ms. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s / disabled - configured via nonvolatile WD1/WD0 bits in control register. |
| EEPROM Capacity | 4kbit (512 × 8) - organized as 16-byte pages; supports byte and page writes with self-timed 5ms typical write cycle. |
| I²C Interface | 400kHz max clock rate - compatible with standard Fast-mode I²C controllers; uses slave address 0xA0 (write) / 0xA1 (read). |
| Block Lock Protection | Configurable via BP2/BP1/BP0 bits - enables hardware-enforced write protection of 16, 32, 64, 128 bytes, or 1/4, 1/2, or full EEPROM array. |
Pinout & Package
8-pin SOIC package (JEDEC MS-012AA), RoHS-compliant, Pb-free plus anneal finish. Pin 1 and Pin 2 are NC (no internal connection); Pin 3 is active-low open-drain RESET output requiring external pull-up resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected or tied to ground per layout best practice. |
| 3 | RESET | Active-low open-drain reset output - asserts when VCC < VTRIP or watchdog times out; requires external pull-up to VCC. |
| 4 | VSS | Ground reference - primary return path for all internal circuits and I²C interface. |
| 5 | SDA | Serial Data bidirectional line - open-drain I²C data bus; requires external pull-up; always input-enabled. |
| 6 | SCL | Serial Clock input - controls timing of all I²C read/write operations; master-generated clock signal. |
| 7 | WP | Write Protect input - HIGH disables all writes (EEPROM and control register); LOW enables write operations. |
| 8 | VCC | Supply voltage input - powers all internal functions including reset generator, watchdog, and EEPROM array. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Reset Threshold | VTRIP adjustable via high-voltage programming sequence on WP pin - enables field calibration to ±10mV precision for critical 3.3V rail monitoring. |
| Low-Power Supervision | <1µA standby current with watchdog disabled - extends battery life in always-on industrial sensors and remote nodes. |
| EEPROM Endurance | 1,000,000 write cycles minimum - supports frequent firmware parameter updates in programmable logic controllers (PLCs). |
| Inadvertent Write Protection | Triple-layer defense: power-up/down detection, WP pin control, and Block Lock™ - prevents corruption during brownout or accidental I²C traffic. |
| Reset Timing Guarantee | RESET asserted for ≥250ms on power-up and held active down to VCC = 1V - ensures complete MCU initialization before release. |
Applications
| Industrial PLC Configuration Storage | Medical Device Parameter Retention |
|---|---|
Use Scenario: Storing calibrated sensor offsets, alarm thresholds, and operational modes in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: CPU supervisor providing brownout-safe reset signaling and nonvolatile memory for configuration persistence across power cycles. Use Value: Eliminates need for separate reset IC and EEPROM, reducing BOM count and PCB area while guaranteeing atomic write-protection during voltage sag. |
Use Scenario: Retaining patient-specific therapy settings and device calibration data in portable infusion pumps operating from Li-ion batteries. IC Role / Device Role / Timing Role: Dual-function supervisor ensuring safe MCU boot under battery discharge and preserving critical treatment parameters in radiation-hardened EEPROM. Use Value: Enables >100-year data retention and 1M-cycle endurance for regulatory-compliant parameter logging without external backup power. |
| Smart Energy Meter Firmware Recovery | Automotive Body Control Module (BCM) Watchdog |
Use Scenario: Recovering from corrupted firmware loads during over-the-air (OTA) updates in ANSI C12.22-compliant smart meters exposed to grid transients. IC Role / Device Role / Timing Role: Watchdog timer monitors bootloader execution and forces hard reset if update stalls; EEPROM stores rollback firmware image checksums. Use Value: Prevents bricking during field updates by enforcing time-bound recovery paths and storing immutable integrity signatures. |
Use Scenario: Monitoring microcontroller health in automotive BCMs where CAN communication loss must trigger immediate subsystem reset. IC Role / Device Role / Timing Role: Independent watchdog circuit asserting RESET if SDA/SCL remain static beyond 200ms - faster than typical CAN timeout windows. Use Value: Provides fail-safe response to MCU lockup without relying on internal timers, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
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; 100µA max standby current. | Lacks field-adjustable reset voltage and lower power - suitable only for fixed-rail designs where precision threshold tuning is unnecessary. | Choose when cost sensitivity outweighs programmability and ultra-low-power needs. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2.5–5.5V; 2.7V reset threshold; 2kbit EEPROM; no external watchdog restart requirement. | Replaces discrete supervisor + MCU with single-chip solution but increases firmware development complexity and validation scope. | Prefer when adding local decision logic (e.g., adaptive reset delay) justifies MCU integration and toolchain investment. |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4043S8IZ-2.7 uniquely balances field-programmable reset accuracy, sub-1µA watchdog-off standby, and robust Block Lock™ EEPROM protection - making it optimal for industrial edge devices requiring both reliability and field serviceability.
Availability
X4043S8IZ-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for X4043S8IZ-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 Corporation, now part of Renesas Electronics, designs high-performance analog and power management ICs for industrial, communications, and computing markets.
The X4043S8IZ-2.7 belongs to Intersil's CPU Supervisor family, engineered specifically to consolidate reset generation, voltage monitoring, watchdog safety, and configuration EEPROM into one die - targeting space-constrained, high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage for X4043S8IZ-2.7?
The X4043S8IZ-2.7 has a factory-programmed reset threshold (VTRIP) of 2.85V to 3.0V, specified over the full -40°C to +85°C temperature range. This range ensures reliable assertion during 3.3V rail brownout while avoiding false triggers near nominal supply. The threshold can be reprogrammed in-system using a 15–18V pulse on the WP pin and an I²C command sequence.
Does X4043S8IZ-2.7 support I²C Fast Mode Plus (1MHz)?
No, the X4043S8IZ-2.7 supports standard and Fast Mode I²C only, with a maximum clock frequency of 400kHz. It does not meet Fast Mode Plus specifications (1MHz, 30mA drive capability). For 1MHz operation, external level-shifting or a dedicated I²C buffer is required - but the internal timing and acknowledge behavior are fully compliant with I²C Specification v2.1 at 400kHz.
How is EEPROM write protection implemented on X4043S8IZ-2.7?
X4043S8IZ-2.7 implements three-tiered EEPROM write protection: (1) hardware WP pin - HIGH disables all writes; (2) Block Lock™ bits (BP2–BP0) - configure 16/32/64/128-byte or 1/4/1/2/full array lock; (3) power-fail detection - blocks writes when VCC drops below VTRIP. All layers operate simultaneously and are nonvolatile except WP state.
Can the watchdog timer on X4043S8IZ-2.7 be disabled permanently?
Yes, the watchdog timer on X4043S8IZ-2.7 can be disabled permanently by setting WD1=WD0=1 via the nonvolatile control register (address 0x1FF). Once programmed, this setting persists across power cycles and cannot be altered unless the WP pin is LOW and the control register is rewritten. Factory default is disabled (WD1=WD0=1).
What is the minimum VCC required for X4043S8IZ-2.7 to assert a valid RESET signal?
The X4043S8IZ-2.7 guarantees valid RESET assertion down to VCC = 1.0V. Below this voltage, internal circuitry may become indeterminate. Above 1.0V, RESET remains active as long as VCC stays below the programmed VTRIP (2.85–3.0V) and is released only after VCC exceeds VTRIP for ≥200ms - ensuring clean release during recovery.
X4043S8IZ-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4043S8IZ-2.7 FAQ
1.How can I place an order for X4043S8IZ-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8IZ-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 X4043S8IZ-2.7 reliable?
The price and inventory of X4043S8IZ-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 X4043S8IZ-2.7 is usually 5 days.
3.What payment methods are accepted for X4043S8IZ-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8IZ-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8IZ-2.7?
X4043S8IZ-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8IZ-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 X4043S8IZ-2.7?
For technical support, including X4043S8IZ-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8IZ-2.7 requirements.
6.How does Aetrix verify that X4043S8IZ-2.7 is sourced from the original manufacturer or authorized distributors?
All X4043S8IZ-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 X4043S8IZ-2.7 meets industry standards.
7.What is the process for return or replacement of X4043S8IZ-2.7?
All X4043S8IZ-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8IZ-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 X4043S8IZ-2.7 part is unused and in its original packaging.
Return procedure for X4043S8IZ-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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