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Renesas X4045S8IZ-2.7A
- Part No.:
- X4045S8IZ-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4045S8IZ-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,553
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Product details
Overview
X4045S8IZ-2.7A 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 industrial microcontroller systems requiring reliable brownout recovery and nonvolatile configuration storage.
For engineers reviewing the X4045S8IZ-2.7A datasheet, X4045S8IZ-2.7A pinout, X4045S8IZ-2.7A application, or X4045S8IZ-2.7A equivalent, this page provides verified functional identity, exact reset threshold (2.85–3.0V), EEPROM endurance (1M cycles), watchdog timeout options (200ms/600ms/1.4s), and validated alternative part selection guidance for embedded system design and BOM continuity planning.
Technical Context
The X4045S8IZ-2.7A implements a dual-function reset architecture: power-on reset holds RESET active for ≥250ms after VCC stabilization, while low-VCC detection asserts RESET when VCC drops below 2.85–3.0V and sustains it until VCC exceeds VTRIP for ≥200ms. Its watchdog timer monitors SDA/SCL activity and triggers RESET if no valid I²C start/stop sequence occurs within the selected timeout interval.
Internally, the device combines a 512 × 8-bit EEPROM array using Direct Write™ cells (100-year data retention, 1M write cycles) with programmable block lock protection (BP2/BP1/BP0 bits) and a volatile control register (WEL/RWEL) governing write enable and watchdog configuration. All functions operate over –40°C to +85°C in Pb-free SOIC-8 packaging.
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 3.3V systems; reprogrammable via high-voltage WP sequence for custom precision. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - configured via nonvolatile WD1/WD0 bits; disabled by default. |
| EEPROM Capacity | 4kbit (512 × 8) - organized as 16-byte pages; supports byte and page writes with self-timed 5ms typical write cycle. |
| I²C Interface Speed | 400kHz - compatible with standard-mode Fast-mode I²C buses; open-drain SDA/SCL require external pull-ups. |
| Standby Current | <1µA (watchdog OFF) - enables ultra-low-power operation in battery-backed or energy-constrained systems. |
| Reset Pulse Width (tPURST) | ≥250ms - ensures sufficient time for microcontroller power rail and oscillator stabilization before release. |
Pinout & Package
Package: 8-pin JEDEC SOIC (Pb-free, RoHS compliant), -40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected; not usable as grounds or bypass nodes. |
| 3 | RESET | Active-low open-drain reset output - requires external pull-up; asserted during power-up, brownout, or watchdog timeout. |
| 4 | VSS | Ground reference - common return path for all internal circuits and I²C bus pull-ups. |
| 5 | SDA | Serial Data bidirectional line - open-drain I²C bus node; supports multi-master arbitration and wire-OR topology. |
| 6 | SCL | Serial Clock input - master-generated clock controlling all I²C read/write timing; no internal buffering. |
| 7 | WP | Write Protect input - HIGH disables all EEPROM and control register writes; used for VTRIP programming at 15–18V. |
| 8 | VCC | Supply voltage input - powers all internal blocks including reset generator, watchdog, and EEPROM array. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set 2.85–3.0V threshold reconfigurable via 15–18V pulse on WP pin - eliminates need for external resistor dividers in precision brownout detection. |
| Block Lock™ Protection | Configurable via BP2/BP1/BP0 bits to protect 0, 16, 32, 64, 128, 256, 512, or full 4kbit EEPROM - prevents inadvertent firmware corruption during field updates. |
| Watchdog Independence | Dedicated SDA/SCL transition detector - operates without MCU intervention; timeout persists across power cycles unless explicitly disabled. |
| Direct Write™ EEPROM | 1,000,000 write cycles and 100-year data retention - enables long-term logging and calibration storage in unattended industrial equipment. |
| Power-Fail Immunity | RESET remains valid down to VCC = 1V - guarantees safe shutdown and state preservation even during rapid supply collapse. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 3.3V main supply and detects undervoltage events during motor actuation or sensor sampling. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout reset, and watchdog timeout - ensures deterministic MCU boot and fault recovery. Use Value: Prevents erratic behavior during transient dips; stores last-dose parameters in protected EEPROM for fail-safe restart after power interruption. |
Use Scenario: Secures critical dosage calibration data and validates system integrity during battery-switchover in portable infusion devices. IC Role / Device Role / Timing Role: Dual-role component: reset generator for safety-critical MCU and tamper-resistant EEPROM for regulatory-compliant parameter storage. Use Value: Meets IEC 62304 Class C requirements via guaranteed reset assertion to 1V and 1M-cycle EEPROM endurance for audit trail retention. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Maintains accurate timekeeping and tariff data during grid voltage sags or capacitor discharge intervals. IC Role / Device Role / Timing Role: Voltage supervisor and nonvolatile memory controller - coordinates reset timing with RTC backup and logs metering anomalies. Use Value: Enables >10-year field life with zero data loss during 200ms brownouts; Block Lock™ prevents unauthorized firmware modification. |
Use Scenario: Supervises 12V-to-3.3V DC-DC output in door module ECUs exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: System-level reset manager with extended temperature support (–40°C to +85°C) and EEPROM-based configuration storage. Use Value: Guarantees robust startup under cold-crank (≤6V) and survives load dump transients via VTRIP hysteresis and latch-up 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 reprogramming; 1kbit EEPROM; 100k write cycles. | Lacks field-adjustable trip point and lower EEPROM endurance - suitable only where fixed threshold suffices and update frequency is low. | Choose when cost sensitivity outweighs programmability needs and EEPROM wear is not a concern. |
| STM8AF5268TCY | Integrated 8-bit MCU with built-in reset supervisor and 8kbyte flash; no external EEPROM; requires firmware development. | Replaces discrete supervisor + EEPROM with software-configurable reset logic - increases design complexity but adds processing capability. | Prefer when system requires local decision-making (e.g., adaptive watchdog) and flash-based parameter storage is acceptable. |
Compared with MAX6361KA29+T and STM8AF5268TCY, the X4045S8IZ-2.7A uniquely balances field-programmable VTRIP, high-endurance EEPROM, and zero-software overhead - making it optimal for safety-certified, maintenance-free embedded systems needing guaranteed hardware-level reliability.
Availability
X4045S8IZ-2.7A is available at Aetrix Electronics and suitable for industrial automation, medical device manufacturing, and automotive electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for X4045S8IZ-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
Intersil (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs focused on power management, precision sensing, and system supervision.
The X4045S8IZ-2.7A belongs to Intersil's CPU Supervisor family, engineered specifically for microcontroller-based systems needing integrated reset, watchdog, and nonvolatile memory - targeting reliability-critical applications in harsh environments.
FAQ
What is the factory-set reset threshold voltage for X4045S8IZ-2.7A?
The X4045S8IZ-2.7A ships with a factory-programmed VTRIP range of 2.85V to 3.0V, optimized for 3.3V supply monitoring. This threshold is stored in nonvolatile memory and remains stable over temperature and time unless reprogrammed using the high-voltage WP sequence described in the FN8118 datasheet. The X4045S8IZ-2.7A maintains this specification across its full –40°C to +85°C operating range.
Does X4045S8IZ-2.7A support I²C communication at 1MHz?
No, the X4045S8IZ-2.7A supports only standard-mode and fast-mode I²C up to 400kHz, as confirmed in the FN8118 datasheet Section 10. Attempting 1MHz operation will result in communication failures due to timing violations in setup/hold times and ACK response windows. For higher-speed interfaces, consider dedicated I²C expanders or separate supervisor/EEPROM solutions.
Can X4045S8IZ-2.7A's watchdog timer be disabled after power-up?
Yes, the X4045S8IZ-2.7A watchdog timer can be disabled via software configuration: set WD1=1 and WD0=1 in the control register (address 1FFh) using the three-step WEL/RWEL write sequence. Once disabled, the watchdog remains off until explicitly re-enabled or the device is power-cycled - no hardware pin toggling is required.
Is the EEPROM in X4045S8IZ-2.7A protected against accidental writes during power transitions?
Yes, the X4045S8IZ-2.7A includes hardware-level write protection that activates automatically when VCC falls below VTRIP - halting all EEPROM operations mid-cycle and preventing partial writes. Combined with Block Lock™ bits and WP pin control, this ensures zero inadvertent corruption during power-up, power-down, or brownout events.
What is the maximum junction temperature rating for X4045S8IZ-2.7A?
The X4045S8IZ-2.7A is rated for operation up to +125°C junction temperature, consistent with its –40°C to +85°C ambient temperature specification in SOIC-8 package. Thermal derating guidelines in FN8118 Section 7 confirm safe operation under continuous 85°C ambient with standard PCB copper pour; no external heatsinking is required.
X4045S8IZ-2.7A 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:
- 2.92V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4045S8IZ-2.7A FAQ
1.How can I place an order for X4045S8IZ-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4045S8IZ-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 X4045S8IZ-2.7A reliable?
The price and inventory of X4045S8IZ-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 X4045S8IZ-2.7A is usually 5 days.
3.What payment methods are accepted for X4045S8IZ-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4045S8IZ-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4045S8IZ-2.7A?
X4045S8IZ-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4045S8IZ-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 X4045S8IZ-2.7A?
For technical support, including X4045S8IZ-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4045S8IZ-2.7A requirements.
6.How does Aetrix verify that X4045S8IZ-2.7A is sourced from the original manufacturer or authorized distributors?
All X4045S8IZ-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 X4045S8IZ-2.7A meets industry standards.
7.What is the process for return or replacement of X4045S8IZ-2.7A?
All X4045S8IZ-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4045S8IZ-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 X4045S8IZ-2.7A part is unused and in its original packaging.
Return procedure for X4045S8IZ-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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