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Renesas X4043S8
- Part No.:
- X4043S8
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,909
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Product details
Overview
X4043S8 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 provides active-low RESET output, 4.5–4.75V VTRIP threshold, 400kHz I²C interface, and <20µA standby current with watchdog enabled - used for reliable microcontroller startup and brownout protection in embedded control systems.
For engineers reviewing the X4043S8 datasheet, X4043S8 pinout, X4043S8 application, or X4043S8 equivalent, key selection considerations include its fixed 4.5V reset threshold, open-drain RESET output requiring external pull-up, block-lock EEPROM protection granularity (16–128 bytes), and nonvolatile watchdog timeout configuration (200ms/600ms/1.4s).
Technical Context
The X4043S8 implements a dedicated low-voltage detection circuit with hysteresis that asserts RESET below 4.5V and holds it until VCC exceeds 4.75V for 200ms. Its watchdog timer monitors SDA/SCL activity using a state machine that resets only upon valid I²C start-stop sequences - not on clock edges alone.
EEPROM operation uses Intersil's Direct Write™ cell architecture enabling 1M write cycles and 100-year data retention. Block Lock™ protection is controlled via nonvolatile BP2–BP0 bits in the control register at address 1FFh, supporting eight distinct lock configurations including full-array, quarter-array, and page-level (16-byte) protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.5–4.75V: precise reset activation point for 5V systems; remains stable over temperature and lifetime. |
| RESET Output Type | Active-low open-drain: requires external pull-up resistor; compatible with 3.3V or 5V logic families. |
| I²C Interface Speed | 400kHz maximum: supports standard-mode Fast-mode I²C buses without timing margin violation. |
| EEPROM Capacity | 4kbit (512 × 8): organized as 512 bytes; enables storage of calibration data, device ID, or firmware flags. |
| Standby Current | <20µA with watchdog enabled: suitable for battery-backed or always-on monitoring applications. |
| Watchdog Timeout | Selectable 200ms/600ms/1.4s: configured via nonvolatile WD1/WD0 bits; persists across power cycles. |
| Operating Voltage | 4.5–5.5V: matches standard 5V rail tolerance; excludes 3.3V-only operation. |
Pinout & Package
Package: 8-lead SOIC (Pb-free, RoHS compliant), JEDEC MS-012AC footprint, 150 mil width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection; must be left unconnected or tied to GND per layout best practice. |
| 3 | RESET | Active-low open-drain reset output; asserted during power-up, brownout, or watchdog timeout. |
| 4 | VSS | Ground reference for all internal circuits; requires low-impedance connection to system ground plane. |
| 5 | SDA | Bidirectional I²C data line; open-drain structure mandates external pull-up resistor (typically 4.7kΩ). |
| 6 | SCL | I²C clock input; driven by master only; edge-sensitive timing critical for 400kHz operation. |
| 7 | WP | Hardware write protect input; HIGH disables all writes including EEPROM and control register. |
| 8 | VCC | Primary power supply input; powers reset logic, watchdog, and EEPROM; must be decoupled with 0.1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | VTRIP can be reprogrammed to custom voltage (e.g., 4.62V) using 15–18V pulse on WP pin - enables precision brownout tuning without component change. |
| Block Lock™ Protection | Eight configurable lock modes (e.g., 16-byte first page or full 512-byte array) prevent accidental overwrite of critical firmware parameters. |
| Self-timed EEPROM Writes | 5ms typical write cycle time with automatic internal timing - eliminates need for host MCU to manage write delays. |
| Power-up Reset Timing | 250ms minimum RESET assertion after VCC stabilization - ensures sufficient time for oscillator startup and FPGA configuration. |
| Low-Voltage Validity | RESET remains asserted down to VCC = 1V - guarantees clean reset release even during deep brownout recovery. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Microcontroller-based PLC executes cyclic control logic while logging fault events to nonvolatile memory. IC Role / Device Role / Timing Role: X4043S8 provides power-on reset, detects 5V rail collapse during EMI transients, and stores calibration offsets in protected EEPROM pages. Use Value: Prevents erratic behavior during brownout by holding MCU in reset until 4.75V is sustained for 200ms; Block Lock™ ensures infusion rate tables cannot be corrupted. | Use Scenario: Battery-powered infusion pump maintains accurate dosing across varying input voltage from aging alkaline cells. IC Role / Device Role / Timing Role: X4043S8 monitors declining 5V rail derived from boost converter; triggers watchdog if motor driver fails to acknowledge I²C commands. Use Value: 4.5V VTRIP aligns with safe operating margin before pump motor stall; 1M-cycle EEPROM retains dose history despite frequent power cycling. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: BCM manages door locks, lighting, and CAN gateway functions in 12V vehicle electrical system. IC Role / Device Role / Timing Role: X4043S8 supervises 5V LDO powering MCU and sensors; asserts RESET during load-dump-induced rail sag. Use Value: Open-drain RESET interfaces directly to MCU's NMI pin; programmable VTRIP allows fine-tuning to match LDO dropout characteristics. | Use Scenario: Revenue-grade meter logs tamper events, phase voltage, and kWh totals over 10+ year service life. IC Role / Device Role / Timing Role: X4043S8 stores meter serial number and tariff tables in EEPROM with full-array lock; resets MCU if firmware fails watchdog check. Use Value: 100-year data retention meets utility regulatory requirements; watchdog timeout set to 600ms balances responsiveness and noise immunity. |
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 |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V reset threshold; no VTRIP programming; 1kbit EEPROM; 2.7–5.5V operation. | Designed for lower-voltage systems; lacks adjustable brownout point and larger EEPROM capacity. | Select when 2.93V reset suffices and 4kbit storage is unnecessary; verify compatibility with existing I²C timing budget. |
| TPS3823-33DBVR | 3.08V fixed reset; no integrated EEPROM; push-pull RESET output; 2.5–5.5V operation. | Requires external EEPROM for parameter storage; simpler reset-only function reduces BOM count where memory is handled elsewhere. | Choose when EEPROM is implemented separately and precise 3.08V reset meets system requirements; eliminates VTRIP configuration overhead. |
Compared with MAX6361KA29+T and TPS3823-33DBVR, the X4043S8 uniquely combines field-programmable VTRIP, 4kbit EEPROM with granular lock, and watchdog timeout persistence - making it optimal for 5V systems needing adaptive brownout response and embedded configuration storage.
Availability
X4043S8 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for X4043S8 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) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.
The X4043S8 belongs to Intersil's CPU Supervisor family, engineered to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage into one die - targeting cost-sensitive, space-constrained embedded systems where reliability under voltage stress is critical.
FAQ
What is the exact reset threshold voltage range for the X4043S8?
The X4043S8 has a factory-set VTRIP threshold range of 4.5V to 4.75V, specified for operation across 0°C to 70°C ambient temperature. This range ensures reliable reset assertion during 5V rail brownout while providing hysteresis to prevent chatter near the trip point. The X4043S8 datasheet confirms this value applies specifically to the X4043S8Z-4.5A ordering variant, which matches the X4043S8 part marking.
Does the X4043S8 support I²C communication at 1MHz?
No, the X4043S8 supports I²C up to 400kHz only, as stated in the FN8118 datasheet Section "Features" and confirmed in the "Serial Interface Conventions" section. Attempting 1MHz operation violates timing specifications and may result in ACK failures or data corruption. The X4043S8 is designed for standard-mode Fast-mode I²C, not High-speed mode.
Can the watchdog timeout period of the X4043S8 be changed after initial programming?
Yes, the watchdog timeout period of the X4043S8 is configurable via nonvolatile WD1/WD0 bits in the control register and persists across power cycles. These bits can be rewritten using the three-step sequence (WEL → RWEL → control byte) described in the FN8118 datasheet Section "Writing to the Control Register". The X4043S8 supports 200ms, 600ms, 1.4s, or disabled states - all retained without battery backup.
Is the EEPROM in the X4043S8 capable of page writes, and what is the page size?
Yes, the X4043S8 EEPROM supports 16-byte page writes, as documented in the "Page Write" section of FN8118. A single I²C transaction can write up to 16 contiguous bytes starting from any address within a page boundary. The X4043S8 implements self-timed internal write cycles (5ms typical), eliminating host MCU delay requirements - a key design advantage over byte-write-only supervisors.
What happens to the RESET output of the X4043S8 when VCC drops below 1V?
Per the FN8118 datasheet Section "Low Voltage Monitoring", the X4043S8 maintains RESET assertion down to VCC = 1V and continues asserting RESET until VCC rises above the VTRIP threshold (4.5–4.75V) and remains there for 200ms. This ensures deterministic behavior during deep brownout recovery and prevents premature MCU release. The X4043S8 specification explicitly guarantees RESET validity to 1V - a critical feature for robust system restart.
X4043S8 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:
- 4.38V
- 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 FAQ
1.How can I place an order for X4043S8 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8 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 reliable?
The price and inventory of X4043S8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043S8 is usually 5 days.
3.What payment methods are accepted for X4043S8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8?
X4043S8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8 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?
For technical support, including X4043S8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8 requirements.
6.How does Aetrix verify that X4043S8 is sourced from the original manufacturer or authorized distributors?
All X4043S8 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 meets industry standards.
7.What is the process for return or replacement of X4043S8?
All X4043S8 units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8, 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 part is unused and in its original packaging.
Return procedure for X4043S8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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