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Renesas X4045S8IZ-2.7
- Part No.:
- X4045S8IZ-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4045S8IZ-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,353
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Product details
Overview
X4045S8IZ-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, selectable watchdog timeout (200 ms/600 ms/1.4 s), 2.7–5.5 V operation, 400 kHz I²C interface, and <1 µA standby current with watchdog disabled - used in industrial microcontroller systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4045S8IZ-2.7 datasheet, X4045S8IZ-2.7 pinout, X4045S8IZ-2.7 application, or X4045S8IZ-2.7 equivalent, key selection considerations include its -40°C to +85°C temperature grade, factory-default 2.85–3.0 V reset threshold, programmable VTRIP capability, 16-byte page write EEPROM, and compatibility with standard I²C bus timing and addressing.
Technical Context
The X4045S8IZ-2.7 implements a dual-function reset architecture: power-on reset asserts RESET for ≥250 ms after VCC stabilization, while low-VCC detection holds RESET active until VCC rises above VTRIP for ≥200 ms. Its watchdog timer monitors SDA/SCL activity using a state machine that resets only on valid I²C start-stop sequences - not on clock stretching or arbitration loss.
EEPROM operation uses Intersil's Direct Write™ cell technology (1M write cycles, 100-year data retention) and supports byte/page writes with built-in block lock protection controlled by nonvolatile BP2–BP0 bits. The control register (address 1FFh) requires a three-step volatile enable sequence (WEL → RWEL → data) before modifying watchdog or protection settings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V logic domains without level shifting. |
| Reset Threshold (VTRIP) | 2.85 V to 3.0 V - factory-programmed trip point ensures deterministic reset assertion during 3.3 V system brownout. |
| Watchdog Timeout | Selectable: 200 ms / 600 ms / 1.4 s - configurable via nonvolatile WD1/WD0 bits to match MCU firmware execution time margins. |
| EEPROM Capacity | 4 kbit (512 × 8) - sufficient for storing calibration data, device IDs, or boot configuration parameters in space-constrained designs. |
| I²C Interface Speed | 400 kHz - compatible with standard-mode Fast-mode I²C buses, enabling high-speed parameter updates without bus contention. |
| Standby Current | <1 µA (watchdog OFF) - enables ultra-low-power operation in battery-backed or energy-harvesting applications. |
| Package | 8-pin SOIC (JEDEC MS-012AA) - industry-standard footprint with 1.27 mm pitch, RoHS-compliant matte tin terminations. |
Pinout & Package
8-pin SOIC package (JEDEC MS-012AA), Pb-free plus anneal, RoHS compliant, moisture sensitivity level (MSL) 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected; no pull-up/down required. |
| 3 | RESET | Active-low open-drain reset output - requires external pull-up resistor; 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 structure allows wire-OR with other I²C slaves; always input-enabled. |
| 6 | SCL | I²C clock input - synchronous timing source for all serial transfers; driven only by master. |
| 7 | WP | Hardware write protect - HIGH disables all EEPROM and control register writes; LOW enables software-controlled protection. |
| 8 | VCC | Power supply input - powers all internal blocks including reset generator, watchdog, and EEPROM array. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set 2.85–3.0 V threshold can be reprogrammed to custom values (≥1.7 V) using 15–18 V pulse on WP pin - eliminates need for external voltage dividers or trim pots. |
| Block Lock™ Protection | Eight configurable protection modes (0 to 128 bytes, 1/4 to full array) controlled by nonvolatile BP2–BP0 bits - prevents accidental overwrites of critical calibration or security data. |
| Self-Timed EEPROM Writes | 5 ms typical write cycle time with automatic internal timing - removes need for host-side delay loops or status polling overhead. |
| Power-Up/Down Write Protection | Automatic disable of all writes when VCC < VTRIP or during power ramp - guarantees EEPROM integrity across supply transients and cold starts. |
| Watchdog Restart Protocol | Requires full I²C start-clock-low-clock-high-stop sequence - immune to spurious SDA/SCL glitches and ensures intentional MCU liveliness confirmation. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 3.3 V supply rail in a DIN-rail mounted PLC CPU module operating in harsh factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides power-on reset hold-off, brownout reset assertion at 2.9 V, and watchdog supervision of real-time task scheduler - all synchronized to same VCC reference. Use Value: Prevents corrupted firmware execution during voltage sags caused by motor startup loads; stores last-known valve position in EEPROM for safe restart after power interruption. | Use Scenario: Embedded in a battery-powered infusion pump where low-power operation and data integrity are critical for patient safety compliance. IC Role / Device Role / Timing Role: Generates clean reset signal during battery voltage decay below 2.9 V; logs dose history and error events to protected EEPROM pages; verifies MCU liveness every 600 ms. Use Value: Ensures pump halts safely before battery reaches unsafe operating voltage; retains audit trail even after complete power loss due to EEPROM's 100-year retention. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Used in Class 0.5S electricity meters deployed in utility substations with wide temperature (-40°C to +85°C) and EMI exposure. IC Role / Device Role / Timing Role: Supervises 3.3 V microcontroller supply; stores tariff schedules and metering constants in Block Lock™-protected EEPROM; detects MCU lockup via I²C activity monitoring. Use Value: Guarantees accurate billing data persistence across 10+ year field life; prevents unauthorized firmware modification through hardware WP pin and multi-level software lock. | Use Scenario: Integrated into a vehicle door module managing window lift, mirror fold, and interior lighting functions powered from 12 V automotive battery (regulated to 3.3 V). IC Role / Device Role / Timing Role: Asserts reset during cold-cranking voltage dips below 2.85 V; stores user preferences (e.g., mirror position) in EEPROM; restarts watchdog on each LIN message ACK. Use Value: Maintains functional safety during engine start transient; enables personalized settings retention without backup capacitor or supercapacitor. |
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 2.93 V reset threshold; no VTRIP programming; 1 kbit EEPROM; 100 kHz I²C only | Lacks field-adjustable reset voltage and higher-speed interface - suitable only for cost-sensitive, fixed-threshold designs | Choose when VTRIP flexibility and 400 kHz bandwidth are unnecessary and BOM simplification is prioritized. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2 kbit EEPROM; 2.7–5.5 V; no programmable VTRIP; different pinout and firmware dependency | Requires embedded firmware development; adds processing capability but increases validation scope | Prefer when system needs local decision-making (e.g., adaptive reset timing) and design team has MCU firmware resources. |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4045S8IZ-2.7 uniquely balances field-programmable reset accuracy, high-speed I²C access to robust EEPROM, and zero-software supervisor operation - making it optimal for industrial and medical systems where deterministic behavior and long-term data integrity are non-negotiable.
Availability
X4045S8IZ-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart metering applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for X4045S8IZ-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
Renesas Electronics acquired Intersil in 2017 and maintains full technical support and manufacturing continuity for the X4045 family. Intersil was a leader in precision analog and power management ICs before acquisition.
The X4045 series was designed specifically for embedded systems needing integrated reset supervision, watchdog safety, and tamper-resistant nonvolatile storage - targeting applications where board space, reliability, and supply chain longevity are critical.
FAQ
What is the factory-default reset threshold voltage for X4045S8IZ-2.7?
The X4045S8IZ-2.7 ships with a factory-programmed VTRIP range of 2.85 V to 3.0 V, optimized for reliable reset assertion in 3.3 V systems experiencing brownout conditions. This threshold is stored in nonvolatile memory and remains stable over temperature and time unless explicitly reprogrammed using the high-voltage VTRIP adjustment sequence defined in the FN8118 datasheet.
Does X4045S8IZ-2.7 support I²C Fast-mode (400 kHz) operation?
Yes, the X4045S8IZ-2.7 fully supports 400 kHz I²C Fast-mode operation as specified in its datasheet. Its SDA and SCL inputs meet standard-mode and Fast-mode timing requirements, enabling high-throughput EEPROM read/write operations without bus slowdown - critical for applications updating calibration data during system initialization or runtime.
How does the watchdog timer in X4045S8IZ-2.7 detect MCU failure?
The X4045S8IZ-2.7 watchdog timer detects MCU failure by monitoring valid I²C protocol transitions on SDA and SCL. It requires a complete four-step sequence - START, SCL LOW, SCL HIGH, STOP - to reset the timer. Unlike simple clock-edge detectors, this method confirms actual I²C bus activity, preventing false timeouts during clock stretching or bus arbitration.
Can the EEPROM in X4045S8IZ-2.7 be protected against accidental writes?
Yes, the X4045S8IZ-2.7 provides multiple layers of EEPROM write protection: hardware WP pin (HIGH disables all writes), software-configurable Block Lock™ (BP2–BP0 bits protect 16-byte to full-array segments), and automatic power-fail lockout (no writes allowed when VCC < VTRIP). These mechanisms operate independently and concurrently to ensure data integrity.
Is X4045S8IZ-2.7 pin-compatible with other members of the X4043/X4045 family?
Yes, all X4043/X4045 variants - including X4045S8IZ-2.7, X4045S8IZ-4.5, and X4045S8Z-2.7 - share identical 8-pin SOIC pinouts and electrical interfaces. Differences are limited to reset threshold voltage, temperature grade, and packaging (e.g., industrial vs. commercial temp), allowing direct substitution in existing layouts when voltage and environmental requirements align.
X4045S8IZ-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 High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4045S8IZ-2.7 FAQ
1.How can I place an order for X4045S8IZ-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4045S8IZ-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 X4045S8IZ-2.7 reliable?
The price and inventory of X4045S8IZ-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 X4045S8IZ-2.7 is usually 5 days.
3.What payment methods are accepted for X4045S8IZ-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4045S8IZ-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4045S8IZ-2.7?
X4045S8IZ-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4045S8IZ-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 X4045S8IZ-2.7?
For technical support, including X4045S8IZ-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4045S8IZ-2.7 requirements.
6.How does Aetrix verify that X4045S8IZ-2.7 is sourced from the original manufacturer or authorized distributors?
All X4045S8IZ-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 X4045S8IZ-2.7 meets industry standards.
7.What is the process for return or replacement of X4045S8IZ-2.7?
All X4045S8IZ-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4045S8IZ-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 X4045S8IZ-2.7 part is unused and in its original packaging.
Return procedure for X4045S8IZ-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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