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Renesas X5043S8I-4.5AT1
- Part No.:
- X5043S8I-4.5AT1
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5043S8I-4.5AT1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,548
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Product details
Overview
X5043S8I-4.5AT1 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in an 8-pin SOIC package. It features a 4.63V ±2.5% reset threshold, 200ms reset timeout, 3.3MHz SPI interface, and block-lock EEPROM protection. Used in industrial process controllers to ensure reliable microcontroller startup and brownout recovery.
For engineers reviewing the X5043S8I-4.5AT1 datasheet, X5043S8I-4.5AT1 pinout, X5043S8I-4.5AT1 application, or X5043S8I-4.5AT1 equivalent, key selection criteria include VTRIP accuracy, watchdog timeout configurability, EEPROM endurance (1M cycles), SPI timing compliance at 3.3MHz, and active-low reset assertion with 1V validity.
Technical Context
The X5043S8I-4.5AT1 implements a dual-function CS/WDI pin for chip select and watchdog input, with falling-edge-triggered watchdog reset. Its reset circuit asserts RESET low when VCC drops below 4.63V and holds it active for 200ms after VCC recovers above threshold.
EEPROM operation uses SPI Mode 0 (CPOL=0, CPHA=0), supports 16-byte page writes with 5ms typical write cycle time, and includes nonvolatile status register bits (WD0/WD1, BL0/BL1) for configuring watchdog timeout (200ms/600ms/1.4s/disabled) and memory block lock (0%, 25%, 50%, or 100% protection).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.63V ±2.5% - precise brownout detection for 5V systems with guaranteed reset assertion down to VCC = 1V |
| Reset Timeout | 200ms nominal - ensures stable power and oscillator settling before processor execution |
| SPI Clock Rate | 3.3MHz max - compatible with standard microcontroller SPI peripherals without clock division |
| EEPROM Endurance | 1,000,000 write cycles - supports frequent calibration data logging in industrial equipment |
| Standby Current | <10µA (WDT off) - enables long battery life in portable instrumentation |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s / disabled - configurable via nonvolatile status register bits WD0/WD1 |
| Memory Organization | 512 × 8-bit array - 4Kbit capacity with block-lock protection covering 0%, 25%, 50%, or 100% of address space |
Pinout & Package
Package: 8-lead SOIC (Small Outline Integrated Circuit), RoHS-compliant, Pb-free plus anneal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS/WDI | Chip Select / Watchdog Input | Active-low enable for SPI communication; falling edge resets watchdog timer |
| 2 WP | Write Protect Input | Hardware lock: LOW disables all nonvolatile writes, overriding software write-enable latch |
| 3 SO | Serial Output | Push-pull output; data shifted out on SCK falling edge during read operations |
| 4 VSS | Ground | Reference return path for all internal circuits and I/O pins |
| 5 VCC | Supply Voltage | 4.5V–5.5V operating range; powers reset generator, watchdog, and EEPROM core |
| 6 SCK | Serial Clock Input | Controls SPI timing; data latched on rising edge, SO changes on falling edge |
| 7 SI | Serial Input | Accepts opcodes, addresses, and write data; latched on SCK rising edge |
| 8 RESET | Reset Output | Active-low open-drain output; asserted during power-up, brownout, or watchdog timeout |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Voltage threshold adjustable via SPI command sequence using VP = 15–18V on WP pin - enables field calibration for system-specific tolerance |
| Block Lock™ Protection | Nonvolatile BL0/BL1 bits configure 0%/25%/50%/100% EEPROM write protection - prevents accidental firmware corruption during updates |
| Direct Write™ EEPROM Cell | 1M write cycles and 100-year data retention - suitable for lifetime-critical parameter storage in medical or industrial devices |
| Dual-Function CS/WDI Pin | Single pin serves as both SPI chip select and watchdog trigger - reduces MCU GPIO count and simplifies PCB routing |
| Low-Voltage Valid Reset | RESET remains active down to VCC = 1V - guarantees fail-safe behavior even during deep brownout conditions |
Applications
| Industrial Process Controller | Network Router |
|---|---|
Use Scenario: Embedded PLC monitors temperature, pressure, and flow sensors in chemical processing plants. IC Role / Device Role / Timing Role: CPU supervisor ensures clean microcontroller boot after power interruption and triggers watchdog reset if control loop hangs. Use Value: Prevents unsafe state transitions by enforcing deterministic reset behavior during brownout and software lockup. | Use Scenario: Residential broadband router stores configuration, MAC tables, and firmware update metadata. IC Role / Device Role / Timing Role: SPI EEPROM retains critical settings across reboots; reset circuit guarantees proper initialization of network stack. Use Value: Eliminates need for external reset IC and separate EEPROM, reducing BOM count and board area by 30%. |
| Desktop Computer Motherboard | Battery-Powered Data Logger |
Use Scenario: BIOS/UEFI firmware stores hardware configuration, boot order, and security keys. IC Role / Device Role / Timing Role: Supervisor provides power-on reset and voltage monitoring; EEPROM stores CMOS setup parameters. Use Value: Enables secure, tamper-resistant storage of boot credentials with hardware write protection enabled. | Use Scenario: Portable environmental sensor records temperature/humidity every 5 minutes for 10 years. IC Role / Device Role / Timing Role: Low-power standby current (<10µA) extends battery life; block-lock protects calibration constants. Use Value: Achieves >5-year operation on CR2032 coin cell while maintaining data integrity through 1M+ write cycles. |
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 |
|---|---|---|---|
| MCP9800T-E/MS | Temperature sensor + 2Kbit EEPROM only; no reset or watchdog functions | Lacks power supervision and system-level fault recovery capability | Select only if thermal monitoring is primary requirement and reset supervision is handled elsewhere |
| MAX6361KA29+T | Supervisor-only IC with 2.93V reset threshold and no EEPROM | Requires external SPI EEPROM for nonvolatile storage | Choose when higher reset accuracy (±0.5%) is needed and board space allows discrete components |
Compared with MCP9800T-E/MS and MAX6361KA29+T, the X5043S8I-4.5AT1 uniquely integrates four functions-reset, watchdog, voltage monitor, and EEPROM-in one SOIC-8 package, eliminating interconnect delays, reducing layout complexity, and guaranteeing synchronized timing between supervision events and memory access.
Availability
X5043S8I-4.5AT1 is available at Aetrix Electronics and suitable for industrial process controllers, network routers, desktop motherboards, and battery-powered data loggers requiring stable component supply across extended temperature ranges.
Supply support for X5043S8I-4.5AT1 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 solutions for industrial, communications, and computing markets.
The X5043 family was designed as a single-chip solution for microcontroller-based systems needing coordinated power supervision, fault recovery, and nonvolatile configuration storage - targeting cost-sensitive, space-constrained embedded applications.
FAQ
What is the exact reset threshold voltage for X5043S8I-4.5AT1?
The X5043S8I-4.5AT1 has a factory-programmed VTRIP of 4.63V ±2.5%, corresponding to the "-4.5A" suffix. This value is guaranteed over temperature and can be reprogrammed to custom thresholds using the VP programming sequence described in the datasheet. The reset signal remains valid down to VCC = 1V.
Does X5043S8I-4.5AT1 support both active-low and active-high reset outputs?
No - the X5043S8I-4.5AT1 provides only an active-low RESET output (open-drain). The X5045 variant offers active-high reset; however, X5043S8I-4.5AT1 is strictly active-low. External pull-up is required for proper logic level translation in most microcontroller interfaces.
How is the watchdog timeout configured on X5043S8I-4.5AT1?
The watchdog timeout on X5043S8I-4.5AT1 is set via nonvolatile WD0/WD1 bits in the status register, programmed using the WRSR instruction. Factory default is disabled (WD1=1, WD0=1); selectable intervals are 200ms, 600ms, or 1.4s. Configuration persists across power cycles and does not require reinitialization.
Can X5043S8I-4.5AT1's EEPROM be written to while the watchdog is active?
Yes - the X5043S8I-4.5AT1 allows EEPROM writes during watchdog operation. However, the CS/WDI pin must be toggled before watchdog timeout expires to prevent reset assertion. Write operations do not interfere with watchdog timing, and the WEL latch must be set via WREN prior to any write.
What is the maximum SPI clock frequency supported by X5043S8I-4.5AT1?
The X5043S8I-4.5AT1 supports a maximum SPI clock frequency of 3.3MHz under recommended operating conditions (VCC = 4.5–5.5V). This is specified in the AC Electrical Characteristics table and applies to both read and write operations, including status register access and page writes.
X5043S8I-4.5AT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X5043S8I-4.5AT1 FAQ
1.How can I place an order for X5043S8I-4.5AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X5043S8I-4.5AT1 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 X5043S8I-4.5AT1 reliable?
The price and inventory of X5043S8I-4.5AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5043S8I-4.5AT1 is usually 5 days.
3.What payment methods are accepted for X5043S8I-4.5AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5043S8I-4.5AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5043S8I-4.5AT1?
X5043S8I-4.5AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5043S8I-4.5AT1 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 X5043S8I-4.5AT1?
For technical support, including X5043S8I-4.5AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5043S8I-4.5AT1 requirements.
6.How does Aetrix verify that X5043S8I-4.5AT1 is sourced from the original manufacturer or authorized distributors?
All X5043S8I-4.5AT1 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 X5043S8I-4.5AT1 meets industry standards.
7.What is the process for return or replacement of X5043S8I-4.5AT1?
All X5043S8I-4.5AT1 units undergo pre-shipment inspection (PSI). If there is an issue with X5043S8I-4.5AT1, 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 X5043S8I-4.5AT1 part is unused and in its original packaging.
Return procedure for X5043S8I-4.5AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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