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Renesas X4045S8I
- Part No.:
- X4045S8I
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4045S8I.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,349
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Product details
Overview
X4045S8I 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 features active-high RESET output, 4.5–4.75V reset threshold, −40°C to +85°C operating range, and 400kHz I²C interface - used for microcontroller system reliability in industrial embedded controllers.
For engineers reviewing the X4045S8I datasheet, X4045S8I pinout, X4045S8I application, or X4045S8I equivalent, key selection considerations include reset polarity (active-high), VTRIP programmability, Block Lock™ EEPROM protection granularity, and watchdog timeout configurability via nonvolatile control register.
Technical Context
The X4045S8I implements a dual-function reset architecture: power-on reset with 250ms delay and brownout detection asserting RESET until VCC exceeds VTRIP 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).
EEPROM operation uses Intersil's Direct Write™ cell technology with 1M write endurance and 100-year data retention. Block Lock™ protection supports eight configurable lock segments (16–128 bytes or full array), controlled by nonvolatile BP2–BP0 bits in the 1FFh control register accessed via 1011 slave address preamble.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Polarity | Active-high open-drain RESET output requiring external pull-up |
| VTRIP Range | 4.5–4.75V standard threshold; reprogrammable to custom voltage using 15–18V on WP pin |
| Supply Voltage | 2.7V to 5.5V operation - supports wide-input industrial power rails |
| EEPROM Capacity | 4kbit (512 × 8) organized as 16-byte pages with self-timed 5ms typical write cycle |
| I²C Interface | 400kHz maximum clock rate; compatible with standard I²C bus timing and addressing |
| Watchdog Timeout | Selectable 200ms, 600ms, or 1.4s via WD1/WD0 bits; factory-default disabled |
| Operating Temp | −40°C to +85°C - qualified for extended-temperature industrial environments |
Pinout & Package
Package: 8-pin SOIC (Pb-free, RoHS compliant), JEDEC MS-012AC variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | No Connect | Unbonded pins - must remain floating; no internal connection |
| 3 | RESET | Active-high open-drain reset output; asserted during power-up, brownout, or watchdog timeout |
| 4 | VSS | Ground reference for all internal circuits and I²C interface |
| 5 | SDA | Bidirectional I²C data line with open-drain output and always-active input buffer |
| 6 | SCL | Input-only I²C clock line controlling serial timing for read/write operations |
| 7 | WP | Hardware write protect: HIGH disables all writes including control register and EEPROM |
| 8 | VCC | Primary power supply input (2.7–5.5V); powers reset logic, watchdog, and EEPROM |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Field-adjustable reset threshold using 15–18V pulse on WP pin - enables precision brownout tuning without hardware change |
| Block Lock™ Protection | Eight independent EEPROM lock configurations (16–128 bytes or full array) controlled by nonvolatile BP bits - prevents inadvertent firmware corruption |
| Watchdog Timer Flexibility | Three selectable timeouts (200ms/600ms/1.4s) stored in nonvolatile WD bits - retains setting across power cycles without external configuration |
| Low-Power Operation | <1µA standby current with watchdog disabled - extends battery life in always-on monitoring systems |
| Direct Write™ EEPROM | 1,000,000 write cycles and 100-year data retention - suitable for logging critical system events over product lifetime |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with fluctuating 24V DC supplies. IC Role / Device Role / Timing Role: X4045S8I provides power-on reset, brownout detection at 4.5V, and watchdog supervision - ensuring deterministic boot and fault recovery. Use Value: Prevents erratic behavior during voltage sags; EEPROM stores calibration coefficients and operational logs with Block Lock™ protecting critical parameters. | Use Scenario: Portable ultrasound unit powered by rechargeable Li-ion battery with variable output voltage under load. IC Role / Device Role / Timing Role: X4045S8I monitors VCC decay, asserts RESET before brownout-induced memory corruption, and logs diagnostic timestamps to EEPROM. Use Value: Enables safe shutdown and post-fault analysis; 100-year data retention preserves device history across multiple service cycles. |
| Smart Energy Meter | Automotive Telematics Gateway |
Use Scenario: ANSI C12.20-compliant electricity meter exposed to wide ambient temperature swings and grid transients. IC Role / Device Role / Timing Role: X4045S8I delivers −40°C to +85°C qualified reset supervision and stores tariff tables and firmware version info in protected EEPROM. Use Value: Ensures meter integrity during cold-start and grid instability; programmable VTRIP accommodates regional voltage tolerances. | Use Scenario: CAN-to-LIN gateway module in vehicle infotainment system requiring fail-safe boot and configuration persistence. IC Role / Device Role / Timing Role: X4045S8I provides active-high RESET compatible with automotive MCU inputs and safeguards bootloader settings in EEPROM. Use Value: Guarantees deterministic initialization after ignition cycling; Block Lock™ prevents accidental overwrite of CAN node ID and baud rate settings. |
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; 100kHz I²C | Lacks field-adjustable brownout point and larger EEPROM capacity - suitable only for fixed-voltage designs | Choose when VTRIP stability and low-cost simplicity outweigh programmability needs |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2kbit EEPROM; 3.0–5.5V supply; no dedicated watchdog timer | Requires firmware development for reset logic; lacks autonomous watchdog - increases software validation burden | Prefer when system-level intelligence (e.g., adaptive reset sequencing) is required beyond basic supervision |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4045S8I uniquely combines field-programmable VTRIP, 4kbit EEPROM with granular Block Lock™, and autonomous watchdog - delivering higher integration and field-service flexibility for industrial microcontroller systems.
Availability
X4045S8I is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, automotive telematics gateways, and embedded IoT edge nodes requiring stable component supply across extended temperature ranges.
Supply support for X4045S8I 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) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.
The X4045S8I belongs to Intersil's CPU Supervisor family designed specifically for robust microcontroller system initialization, fault monitoring, and nonvolatile configuration storage in harsh industrial and automotive environments.
FAQ
What is the reset polarity and output type of the X4045S8I?
The X4045S8I features an active-high open-drain RESET output (pin 3). This requires an external pull-up resistor to VCC to generate a valid logic-high signal. The output asserts during power-up (250ms), brownout (VCC < VTRIP), or watchdog timeout, and remains asserted until VCC exceeds VTRIP for 200ms. This polarity matches common industrial microcontrollers expecting active-high reset signals.
Does the X4045S8I support programmable reset threshold voltage?
Yes, the X4045S8I supports field-programmable VTRIP using a 15–18V pulse applied to the WP pin during a defined I²C sequence. This allows adjustment of the reset threshold to custom values - for example, fine-tuning from the standard 4.5–4.75V range to match specific power supply tolerances. The procedure is documented in the FN8118 datasheet and does not corrupt EEPROM contents.
How does the watchdog timer in the X4045S8I operate and what timeout options are available?
The X4045S8I watchdog timer monitors SDA and SCL lines for valid I²C activity. It resets the system if no START/STOP sequence occurs within the selected interval. Timeout is set via nonvolatile WD1/WD0 bits: 00 = 1.4s, 01 = 600ms, 10 = 200ms, 11 = disabled (factory default). The setting persists across power cycles and can be changed only when WEL and RWEL latches are enabled.
What EEPROM protection mechanisms does the X4045S8I provide?
The X4045S8I implements three-tiered EEPROM protection: (1) Power-up/down circuitry that blocks writes during VCC transitions, (2) Hardware WP pin that disables all writes when HIGH, and (3) Block Lock™ software protection enabling eight lock configurations (16–128 bytes or full array) via BP2–BP0 bits. This prevents accidental firmware or calibration data corruption in mission-critical applications.
Is the X4045S8I pin-compatible with other members of the X4043/X4045 family?
Yes, the X4045S8I shares identical 8-pin SOIC pinout and electrical interface with all X4043/X4045 variants, including X4045S8Z-4.5A and X4045S8IZ-2.7A. Differences are limited to reset polarity (X4043 = active-low, X4045 = active-high), VTRIP range, and temperature grade - allowing direct substitution where those parameters align with system requirements.
X4045S8I 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 High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4045S8I FAQ
1.How can I place an order for X4045S8I through Aetrix?
Please submit a Request for Quotation (RFQ) for X4045S8I 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 X4045S8I reliable?
The price and inventory of X4045S8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4045S8I is usually 5 days.
3.What payment methods are accepted for X4045S8I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4045S8I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4045S8I?
X4045S8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4045S8I 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 X4045S8I?
For technical support, including X4045S8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4045S8I requirements.
6.How does Aetrix verify that X4045S8I is sourced from the original manufacturer or authorized distributors?
All X4045S8I 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 X4045S8I meets industry standards.
7.What is the process for return or replacement of X4045S8I?
All X4045S8I units undergo pre-shipment inspection (PSI). If there is an issue with X4045S8I, 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 X4045S8I part is unused and in its original packaging.
Return procedure for X4045S8I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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