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Renesas X4045M8-2.7A
- Part No.:
- X4045M8-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
X4045M8-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
X4045M8-2.7A 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-high RESET output, 2.7–5.5V operation, 2.85–3.0V reset threshold, and 400kHz I²C interface - used in embedded microcontroller systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4045M8-2.7A datasheet, X4045M8-2.7A pinout, X4045M8-2.7A application, or X4045M8-2.7A equivalent, key selection considerations include its active-high reset assertion, programmable VTRIP, 16-byte page write EEPROM, watchdog timeout options (200ms/600ms/1.4s), and MSOP-8 package compatibility with space-constrained industrial controllers.
Technical Context
The X4045M8-2.7A implements a dual-function supervisory architecture: analog voltage monitoring with hysteresis-based low-VCC detection and digital watchdog logic that monitors SDA/SCL activity. Its reset generation circuit holds RESET high for ≥250ms at power-up and asserts it again if VCC drops below 2.85V (typical), remaining active until VCC exceeds VTRIP for ≥200ms.
EEPROM functionality uses Intersil's Direct Write™ cell technology (1M write cycles, 100-year retention) and supports software-controlled block lock protection across eight memory segments. The 2-wire I²C-compatible interface operates up to 400kHz with open-drain SDA/SCL, mandatory external pull-ups, and built-in write enable latching (WEL/RWEL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports single-supply operation across 3.3V and 5V systems without level-shifting. |
| Reset Threshold (VTRIP) | 2.85V to 3.0V - factory-set for 3V nominal rails; reprogrammable via high-voltage WP sequence for precision brownout response. |
| Reset Output Polarity | Active-high open-drain - requires external pull-up; compatible with standard microcontroller reset inputs expecting active-high assertion. |
| Watchdog Timeout Options | 200ms / 600ms / 1.4s - selectable via nonvolatile WD1/WD0 bits; disabled by default after power-up. |
| EEPROM Capacity & Interface | 4kbit (512 × 8) with 400kHz I²C - enables firmware parameter storage and calibration data logging without dedicated memory ICs. |
| Standby Current | <1µA (watchdog OFF) - extends battery life in always-on monitoring nodes where watchdog is unused. |
| Package | 8-pin MSOP - 3mm × 3mm footprint ideal for compact PCB layouts in portable instrumentation and PLC modules. |
Pinout & Package
8-pin MSOP (Moisture Sensitivity Level 1, RoHS-compliant Pb-free finish). Pin 1 and Pin 2 are no-connect (NC); RESET is active-high open-drain output requiring external pull-up resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | No Connect (NC) | Internally unconnected; must remain floating or grounded per layout best practices - no routing or soldering required. |
| 3 | RESET | Active-high open-drain reset output - asserts during power-up, brownout (VCC < 2.85V), or watchdog timeout; requires external pull-up to VCC. |
| 4 | VSS | Ground reference - connects to system 0V plane; decoupling capacitor (0.1µF) recommended adjacent to pin. |
| 5 | SDA | Serial Data bidirectional I²C line - open-drain structure allows bus sharing; pull-up resistor (2.2kΩ typical) required. |
| 6 | SCL | Serial Clock input - driven by master MCU; timing-critical path; minimize trace length and avoid stubs. |
| 7 | WP | Write Protect input - HIGH disables all writes (EEPROM + control register); LOW enables programming; tied to VSS when unused. |
| 8 | VCC | Supply voltage input - accepts 2.7–5.5V; bypassed with 0.1µF ceramic capacitor directly to VSS. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Reset Threshold | VTRIP adjustable from 1.7V to 5.5V using 15–18V pulse on WP pin - eliminates need for external voltage dividers in precision brownout applications. |
| Block Lock™ EEPROM Protection | Eight configurable lock segments (16B to full array) controlled by nonvolatile BP2/BP1/BP0 bits - prevents accidental overwrites of critical calibration or boot code. |
| Self-Timed EEPROM Writes | 5ms typical write cycle time with automatic internal timing - removes need for host MCU to manage write delays or polling overhead. |
| Power-Up Reset Hold Time | ≥250ms minimum assertion - ensures stable power and oscillator startup before MCU release, preventing erratic boot behavior. |
| Low-Voltage Reset Validity | RESET remains asserted down to VCC = 1V - guarantees clean reset even during deep brownout or battery sag conditions. |
Applications
| Industrial PLC I/O Module | Medical Sensor Node |
|---|---|
Use Scenario: Compact remote I/O module with ARM Cortex-M0+ MCU operating from 3.3V rail, subject to intermittent power dips during field deployment. IC Role / Device Role / Timing Role: X4045M8-2.7A provides brownout reset (2.85V threshold), watchdog supervision of firmware execution, and EEPROM storage for channel calibration coefficients. Use Value: Prevents corrupted sensor readings during undervoltage events and preserves calibration integrity across 100+ years of field operation using Direct Write™ EEPROM. | Use Scenario: Battery-powered wearable ECG monitor requiring ultra-low standby current and tamper-proof storage of patient-specific gain settings. IC Role / Device Role / Timing Role: X4045M8-2.7A delivers <1µA watchdog-OFF standby draw, active-high reset compatible with low-power MCU reset pin, and 128-byte locked EEPROM segment for secure parameter storage. Use Value: Extends battery life beyond 12 months while ensuring clinical-grade parameter persistence and immunity to accidental writes during firmware updates. |
| Automotive Body Control Unit | Smart Energy Meter |
Use Scenario: 12V-to-3.3V powered BCM managing door locks and lighting, exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: X4045M8-2.7A monitors post-regulator 3.3V rail, asserts RESET during cold-crank brownout, and logs fault codes in EEPROM with Block Lock™ enabled for first 128 bytes. Use Value: Maintains deterministic reset behavior across -40°C to 85°C (via X4045M8IZ-2.7A variant) and survives 1M+ write cycles for lifetime diagnostic logging. | Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 interface and real-time clock, requiring tamper-evident configuration storage. IC Role / Device Role / Timing Role: X4045M8-2.7A stores meter ID, tariff tables, and security keys in EEPROM protected by BP2/BP1/BP0 lock bits; RESET ensures clean restart after power interruption. Use Value: Meets IEC 62056 compliance for secure parameter retention and eliminates external reset IC + EEPROM BOM cost. |
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; same 8-pin SOIC package. | Lacks reprogrammable brownout point and larger EEPROM - suitable only where 2.93V threshold matches system requirements exactly. | Select when design requires drop-in replacement with guaranteed 2.93V trip and lower EEPROM capacity suffices. |
| STM8S003F3P6 | 8-bit MCU with integrated 128B EEPROM and reset controller; no external watchdog; requires firmware development. | Replaces discrete supervisor + EEPROM with programmable logic - adds flexibility but increases validation effort and BOM complexity. | Choose when system needs runtime-configurable reset behavior or additional GPIO/peripherals beyond supervision. |
Compared with MAX6361KA29+T, X4045M8-2.7A offers field-adjustable VTRIP and 4× more EEPROM; versus STM8S003F3P6, it delivers zero-firmware, pin-level reliability assurance with proven analog reset accuracy - critical for safety-critical or certified designs.
Availability
X4045M8-2.7A 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 RoHS-compliant packaging.
Supply support for X4045M8-2.7A 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
Renesas Electronics Corporation (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and IoT markets.
The X4045 family was designed to consolidate power supervision, watchdog safety, and nonvolatile storage into a single IC - reducing board area and improving system-level reliability in resource-constrained embedded systems.
FAQ
What is the reset output polarity and drive type of the X4045M8-2.7A?
The X4045M8-2.7A features an active-high open-drain RESET output. This means the pin drives low to de-assert reset and floats high (requiring an external pull-up resistor to VCC) to assert reset. This configuration ensures compatibility with MCUs that require active-high reset signals and allows wired-OR connection with other reset sources. The X4045M8-2.7A does not provide push-pull drive.
Can the reset threshold voltage (VTRIP) of the X4045M8-2.7A be modified after manufacturing?
Yes, the X4045M8-2.7A supports field-programmable VTRIP adjustment using a 15–18V pulse applied to the WP pin during a defined I²C sequence. This allows precise tuning of the 2.85–3.0V factory setting to match specific system rail tolerances or compensate for temperature drift. The X4045M8-2.7A retains the programmed value indefinitely without battery backup.
How does the watchdog timer in the X4045M8-2.7A detect microcontroller failure?
The X4045M8-2.7A watchdog monitors SDA and SCL bus activity - specifically detecting valid I²C start/stop sequences. If no compliant communication occurs within the selected timeout (200ms/600ms/1.4s), it asserts RESET. Unlike timer-based watchdogs, this method confirms actual firmware execution rather than just clock ticks, making the X4045M8-2.7A robust against stalled I²C peripherals or bus lockups.
What EEPROM protection mechanisms does the X4045M8-2.7A provide beyond standard write enable?
Beyond WEL/RWEL latches, the X4045M8-2.7A implements hardware-based Block Lock™ protection controlled by nonvolatile BP2/BP1/BP0 bits. This allows locking of eight distinct memory segments - from 16 bytes to the full 512-byte array - preventing writes even if software erroneously enables the EEPROM. The X4045M8-2.7A also includes power-cycle write inhibition: writes are blocked whenever VCC falls below VTRIP.
Is the X4045M8-2.7A pin-compatible with other members of the X4043/X4045 family?
Yes, the X4045M8-2.7A shares identical pinout and function mapping with all X4043/X4045 variants in MSOP-8 packages, including X4045M8Z-2.7A and X4045M8IZ-2.7A. Differences are limited to reset polarity (X4043 = active-low), VTRIP range (e.g., -2.7 vs -4.5 suffix), and temperature grade. The X4045M8-2.7A maintains full electrical and mechanical compatibility within its package family.
X4045M8-2.7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
X4045M8-2.7A FAQ
1.How can I place an order for X4045M8-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4045M8-2.7A 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 X4045M8-2.7A reliable?
The price and inventory of X4045M8-2.7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4045M8-2.7A is usually 5 days.
3.What payment methods are accepted for X4045M8-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4045M8-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4045M8-2.7A?
X4045M8-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4045M8-2.7A 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 X4045M8-2.7A?
For technical support, including X4045M8-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4045M8-2.7A requirements.
6.How does Aetrix verify that X4045M8-2.7A is sourced from the original manufacturer or authorized distributors?
All X4045M8-2.7A 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 X4045M8-2.7A meets industry standards.
7.What is the process for return or replacement of X4045M8-2.7A?
All X4045M8-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4045M8-2.7A, 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 X4045M8-2.7A part is unused and in its original packaging.
Return procedure for X4045M8-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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