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Renesas X5045S8Z-4.5A
- Part No.:
- X5045S8Z-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5045S8Z-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,602
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Product details
Overview
X5045S8Z-4.5A from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4K-bit SPI EEPROM in a single 8-pin SOIC package. It provides active-low RESET output, 4.63V ±2.5% VTRIP threshold, 1.4s/600ms/200ms selectable watchdog timeout, and 512 × 8-bit block-lock protected EEPROM with 1M write endurance. It is used in industrial process controllers to ensure deterministic boot and data integrity during brownout events.
For engineers reviewing the X5045S8Z-4.5A datasheet, X5045S8Z-4.5A pinout, X5045S8Z-4.5A application, or X5045S8Z-4.5A equivalent, this page delivers verified functional identity, exact VTRIP behavior, watchdog timing modes, EEPROM protection granularity, and validated alternative parts for system-level reliability design.
Technical Context
The X5045S8Z-4.5A implements a dual-function CS/WDI pin that serves as both chip select and watchdog input - toggling CS within the selected timeout period resets the watchdog. Its internal POR circuit asserts RESET for ≥200ms after VCC exceeds 4.5V until stabilization, and reasserts it if VCC drops below 4.5V–4.75V (±2.5%).
Voltage threshold is factory-programmed to 4.63V but supports field reprogramming via VP = 15–18V on WP and precise VCC biasing; the status register holds nonvolatile WD0/WD1 bits controlling timeout and BL0/BL1 bits enabling quarter/half/full EEPROM block lock. The SPI interface operates up to 3.3MHz with MSB-first protocol and 16-byte page writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.63V ±2.5%, factory-set trip point ensuring reliable reset at nominal 5V systems before brownout corruption |
| Watchdog Timeout | Selectable 200ms / 600ms / 1.4s (WD0/WD1 bits); default = disabled; prevents runaway code without software intervention |
| EEPROM Capacity | 4K-bit (512 × 8), organized for SPI access; supports 16-byte page writes with 5ms typical cycle time |
| Block Lock Protection | Configurable via status register: protect 0%, 25%, 50%, or 100% of EEPROM array against accidental overwrite |
| Supply Range | 4.5V to 5.5V - matches standard 5V logic rails and ensures compatibility with legacy industrial power domains |
| Standby Current | <10µA (WDT off) or <50µA (WDT on) at 5.5V - enables long-term battery-backed operation in remote sensors |
| SPI Clock Rate | Up to 3.3MHz - supports high-speed configuration loading without requiring microcontroller clock scaling |
Pinout & Package
Package: 8-lead SOIC (Pb-free, RoHS compliant), 0°C to +70°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS/WDI | Chip Select Input / Watchdog Input | Active-low enable for SPI commands; falling edge resets watchdog timer; must toggle within timeout window |
| 2: WP | Write Protect Input | Low = disables all nonvolatile writes (EEPROM & status register); overrides WREN latch when asserted |
| 3: SO | Serial Output | Push-pull output; shifts data MSB-first on falling SCK edge; high-impedance when CS = high |
| 4: VSS | Ground | Reference return path for all digital and analog functions; requires low-impedance PCB connection |
| 5: VCC | Supply Voltage | 4.5–5.5V input powering reset generation, watchdog, and EEPROM; also used as reference for VTRIP programming |
| 6: SCK | Serial Clock Input | Controls SPI timing; latches SI on rising edge, drives SO on falling edge; static-compatible (clock may pause) |
| 7: SI | Serial Input | Receives opcodes, addresses, and data MSB-first; latched on rising SCK edge; must be stable tSU before edge |
| 8: RESET/RESET | Reset Output (Active-Low) | Open-drain output asserted when VCC < VTRIP or watchdog expires; remains active ≥200ms after VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Field-adjustable reset threshold using 15–18V on WP and precise VCC bias - eliminates BOM variants for custom voltage margins |
| Block Lock™ EEPROM | Nonvolatile BL0/BL1 bits enable hardware-enforced write protection of 25%/50%/100% memory - prevents firmware corruption during debug or update |
| Dual-mode CS/WDI pin | Single pin handles both SPI bus selection and watchdog stimulus - reduces MCU GPIO count and simplifies layout |
| Direct Write™ EEPROM cell | 1 million write cycles and 100-year data retention - suitable for logging critical event timestamps in unattended equipment |
| Low-VCC reset validity | RESET remains asserted down to VCC = 1V - guarantees clean shutdown even during deep brownout or capacitor discharge |
Applications
| Industrial Process Controller | Network Router Bootloader Storage |
|---|---|
|
Use Scenario: Embedded PLC monitors analog sensor inputs and controls solenoid valves in chemical dosing systems. IC Role / Device Role / Timing Role: X5045S8Z-4.5A supervises 5V rail, triggers hard reset on undervoltage, stores calibration coefficients in protected EEPROM, and restarts watchdog on CS toggle from main loop. Use Value: Prevents erratic valve actuation during line sags; retains calibrated offsets across 10+ years of operation without backup battery. |
Use Scenario: Router loads firmware image from flash and validates checksum before execution. IC Role / Device Role / Timing Role: X5045S8Z-4.5A holds secure boot keys and last-known-good firmware hash in block-locked EEPROM; asserts RESET if VCC dips during signature verification. Use Value: Blocks unauthorized firmware updates; ensures cryptographic keys remain intact despite power interruptions during OTA upgrades. |
| Desktop PC Power Sequencing | Battery-Powered Data Logger |
|
Use Scenario: Motherboard BIOS initializes chipset and memory after ATX power stabilizes. IC Role / Device Role / Timing Role: X5045S8Z-4.5A generates synchronized RESET pulse only after 5V rail exceeds 4.63V for 200ms, then releases control to southbridge. Use Value: Eliminates need for discrete RC reset circuit; guarantees consistent boot timing across manufacturing variance and temperature drift. |
Use Scenario: Remote environmental sensor logs temperature/humidity every 15 minutes using coin-cell power. IC Role / Device Role / Timing Role: X5045S8Z-4.5A stores timestamped readings in EEPROM with 25% block lock; watchdog forces reboot if MCU hangs mid-write. Use Value: Achieves >5-year operational life on CR2032; survives 100,000+ write cycles with no data loss due to power failure mid-write. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V reset threshold; no VTRIP reprogramming; 256-byte EEPROM; no watchdog timer | Lacks configurable watchdog and field-adjustable VTRIP - suitable only for simple reset-only use cases | Choose when only basic voltage monitoring is needed and EEPROM size <1K is acceptable |
| MCP9808-E/P | Temperature sensor with I²C interface; no reset, watchdog, or EEPROM - functionally unrelated | Not a functional alternative - misaligned device class (sensor vs supervisor) | Avoid; incorrect category match - verify part number before substitution |
Compared with MAX6361KA29+T and MCP9808-E/P, the X5045S8Z-4.5A uniquely combines field-programmable VTRIP, three-tier watchdog timeout, and 4K block-lock EEPROM in one SOIC-8 package - making it irreplaceable for designs requiring coordinated reset, supervision, and nonvolatile storage with hardware-enforced write protection.
Availability
X5045S8Z-4.5A is available at Aetrix Electronics and suitable for industrial process controllers, network router bootloader storage, and desktop PC power sequencing requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for X5045S8Z-4.5A 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.
The X5045S8Z-4.5A belongs to Intersil's CPU Supervisor family, designed to consolidate reset, watchdog, voltage monitoring, and EEPROM into one die - reducing board area and improving system-level reliability in cost-sensitive embedded applications.
FAQ
What is the factory-set VTRIP voltage for X5045S8Z-4.5A?
The X5045S8Z-4.5A ships with a factory-programmed VTRIP of 4.63V ±2.5%, corresponding to the "-4.5A" suffix per the ordering table. This threshold is guaranteed over temperature and lifetime, and can be reprogrammed in-system using VP = 15–18V on the WP pin and precise VCC biasing - a capability not found in most competing supervisors.
Does X5045S8Z-4.5A support active-high RESET output?
No - the X5045S8Z-4.5A provides only an active-low open-drain RESET output (pin 8). The datasheet confirms RESET/RESET is asserted low during power-up, brownout, or watchdog timeout. For active-high reset requirements, external inversion (e.g., transistor or logic gate) is necessary; no internal active-high variant exists for this specific part number.
How many watchdog timeout options does X5045S8Z-4.5A offer?
The X5045S8Z-4.5A offers three programmable watchdog timeout periods - 200ms, 600ms, and 1.4s - controlled by nonvolatile WD0 and WD1 bits in the status register. A fourth state (WD0=WD1=1) disables the watchdog entirely. These settings persist across power cycles and do not require reinitialization after each reset.
Can X5045S8Z-4.5A's EEPROM be written byte-by-byte or only in pages?
The X5045S8Z-4.5A supports both byte and page writes. Page writes (up to 16 bytes within the same 16-byte boundary) reduce total programming time versus sequential byte writes. Each write operation - whether byte or page - requires the WREN instruction first, and CS must go high after the final data byte to commit the write; partial writes are discarded if CS remains low.
Is X5045S8Z-4.5A pin-compatible with X5043S8Z-4.5A?
Yes - X5045S8Z-4.5A and X5043S8Z-4.5A share identical 8-pin SOIC packaging, pinout, and electrical specifications. The key functional difference is RESET polarity: X5045S8Z-4.5A has active-low RESET, while X5043S8Z-4.5A has active-high RESET. Swapping them requires verifying downstream reset logic polarity compatibility.
X5045S8Z-4.5A 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:
- 4.62V
- 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-SOIC
X5045S8Z-4.5A FAQ
1.How can I place an order for X5045S8Z-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X5045S8Z-4.5A 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 X5045S8Z-4.5A reliable?
The price and inventory of X5045S8Z-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5045S8Z-4.5A is usually 5 days.
3.What payment methods are accepted for X5045S8Z-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5045S8Z-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5045S8Z-4.5A?
X5045S8Z-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5045S8Z-4.5A 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 X5045S8Z-4.5A?
For technical support, including X5045S8Z-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5045S8Z-4.5A requirements.
6.How does Aetrix verify that X5045S8Z-4.5A is sourced from the original manufacturer or authorized distributors?
All X5045S8Z-4.5A 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 X5045S8Z-4.5A meets industry standards.
7.What is the process for return or replacement of X5045S8Z-4.5A?
All X5045S8Z-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X5045S8Z-4.5A, 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 X5045S8Z-4.5A part is unused and in its original packaging.
Return procedure for X5045S8Z-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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