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Renesas X5325S8I
- Part No.:
- X5325S8I
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5325S8I.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,934
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Product details
Overview
X5325S8I from Intersil is a CPU supervisor IC with integrated 32kbit SPI EEPROM, combining power-on reset control, watchdog timer, supply voltage supervision, and block-lock protected memory in a single 8-lead SOIC package. It operates from 4.5V to 5.5V, features a factory-programmed 4.5V–4.75V reset threshold, and delivers active-high RESET output for microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.
For engineers reviewing the X5325S8I datasheet, X5325S8I pinout, X5325S8I application, or X5325S8I equivalent, this device supports critical system-level functions including power sequencing validation, watchdog timeout recovery, programmable VTRIP calibration, and secure SPI EEPROM writes with page-mode timing and block lock protection - all within industrial temperature range (−40°C to +85°C).
Technical Context
The X5325S8I implements a dual-function CS/WDI pin that serves as both chip select for SPI communication and watchdog input for timer reset; its internal power-on reset circuit asserts RESET/RESET at ~1V and holds it for ≥200ms after VCC stabilizes above the trip point. The device uses nonvolatile status register bits (WD0/WD1) to configure watchdog timeout periods (200ms/600ms/1.4s), and supports reprogramming of the VTRIP threshold via dedicated VP-based sequences on SCK/SI pins.
Its EEPROM array is organized as 4k × 8, supports 32-byte page writes with self-timed 10ms typical write cycles, and includes hardware/software write protection via WP pin and BL0/BL1 block lock bits. The SPI interface complies with modes 0,0 and 1,1, operates up to 2MHz, and maintains valid SO output even down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - powers full functionality including watchdog, reset, and EEPROM access without external regulation |
| VTRIP Threshold | 4.5V to 4.75V (typ. 4.63V) - factory-set reset activation voltage for 5V systems; reprogrammable via VP sequence |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - configured by nonvolatile WD0/WD1 bits; remains fixed across power cycles |
| EEPROM Capacity | 32kbit (4k × 8) - supports firmware parameter storage, calibration data, and event logs with block lock protection |
| Standby Current | <50µA max (WDT on), <1µA max (WDT off) - enables long-term battery-backed operation in low-power embedded systems |
| SPI Speed | Up to 2MHz - compatible with standard microcontroller SPI peripherals; supports modes 0,0 and 1,1 |
| Reset Output Polarity | Active-high (RESET) - directly interfaces with processors expecting high-asserted reset signals without level-shifting |
Pinout & Package
Package: 8-lead SOIC (Pb-free, RoHS compliant), body width 3.9mm, pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CS/WDI | Chip Select / Watchdog Input | LOW enables SPI mode; HIGH-to-LOW transition resets watchdog timer - dual-role pin reduces board routing complexity |
| 2: SO | Serial Output | Push-pull output delivering read data MSB-first on falling SCK edge; remains valid down to VCC = 1V |
| 3: WP | Write Protect | Hardware lock for status register writes when WPEN bit = 1 - prevents accidental modification of watchdog or block lock settings |
| 4: VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance for stable reset timing |
| 5: VCC | Supply Voltage | 4.5V–5.5V input powering reset logic, watchdog, EEPROM, and SPI interface; powers internal voltage reference |
| 6: SI | Serial Input | Latches instruction, address, and data on rising SCK edge; accepts WREN, WRITE, RDSR, and WRSR opcodes |
| 7: SCK | Serial Clock | Controls SPI timing; rising edge latches SI data, falling edge clocks SO data; used during VTRIP programming |
| 8: RESET | Reset Output | Active-high open-drain output asserted during power-up, brown-out, or watchdog timeout; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Threshold adjustable via VP pulse on SCK/SI - enables field calibration to match system-specific supply tolerance |
| Block Lock™ Protection | Nonvolatile BL0/BL1 bits protect 0%, 25%, 50%, or 100% of EEPROM - prevents corruption of critical boot or calibration data |
| Volatile Reset Flag | FLB bit distinguishes watchdog vs. power-fail reset origin - allows firmware to initiate appropriate recovery path |
| Low-Voltage Valid Reset | RESET asserted down to VCC = 1V - ensures deterministic behavior during deep brown-out conditions |
| Page-Write EEPROM | 32-byte page writes with 10ms typical cycle time - reduces firmware update latency versus byte-write alternatives |
Applications
| Industrial PLC Control | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controller monitors sensor inputs and drives actuators in harsh factory environments. IC Role / Device Role / Timing Role: X5325S8I provides power-on reset assertion, continuous watchdog supervision, and stores calibrated I/O mapping tables in EEPROM. Use Value: Prevents erratic startup due to unstable 5V rail; detects firmware hangs; retains configuration across power loss without backup battery. |
Use Scenario: Portable ultrasound unit performs real-time image processing and stores user preferences and calibration offsets. IC Role / Device Role / Timing Role: X5325S8I delivers active-high reset signal compatible with ARM Cortex-M processor, monitors VCC during battery discharge, and secures calibration data against overwrite. Use Value: Ensures safe shutdown before brown-out-induced memory corruption; enables field recalibration via VTRIP adjustment; protects FDA-required calibration constants. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: BCM manages door locks, lighting, and window controls in 12V automotive electrical system with wide input transients. IC Role / Device Role / Timing Role: X5325S8I supervises 5V LDO output, triggers reset on load-dump-induced dips, and stores fault logs in EEPROM with block lock. Use Value: Meets AEC-Q100 Class 2 temp range (−40°C to +85°C); survives ISO 7637-2 pulses via robust VTRIP hysteresis; retains crash-event timestamps. |
Use Scenario: Revenue-grade meter records kWh consumption, tariff schedules, and tamper events over 10+ year lifetime. IC Role / Device Role / Timing Role: X5325S8I provides precise 4.63V reset threshold for 5V MCU domain, guards against undervoltage-induced flash corruption, and stores billing history with 100-year data retention. Use Value: Factory-trimmed VTRIP eliminates external resistor network; EEPROM endurance ≥100,000 cycles supports daily log writes; WP pin enables production-line locking. |
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 reprogramming; 16kbit EEPROM; 3.0V–5.5V supply | Lacks field-adjustable trip point and larger EEPROM capacity; suitable only for fixed-threshold designs | Choose when VTRIP calibration is unnecessary and lower EEPROM density suffices |
| STM8AF6266TCX | MCU with integrated 2kbyte EEPROM and reset controller; requires firmware development; no standalone watchdog | Requires software integration effort; lacks dedicated hardware watchdog with configurable timeout | Choose only if system already uses STM8 platform and can allocate firmware resources for supervisor logic |
Compared with MAX6361KA29+T and STM8AF6266TCX, the X5325S8I uniquely combines field-reprogrammable VTRIP, 32kbit block-locked EEPROM, and three selectable watchdog timeouts in a pin-compatible 8-SOIC footprint - enabling drop-in reliability upgrades without layout changes or firmware redesign.
Availability
X5325S8I is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for X5325S8I 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 precision analog, power management, and interface ICs for industrial, computing, and communications markets.
The X5325S8I belongs to Intersil's CPU Supervisor family designed for embedded systems needing integrated reset, watchdog, and nonvolatile memory - targeting cost-sensitive, space-constrained applications where reliability and field configurability are critical.
FAQ
What is the factory-default reset threshold voltage for X5325S8I?
The X5325S8I is shipped with a factory-programmed VTRIP range of 4.5V to 4.75V (typical 4.63V), optimized for 5V systems. This threshold is stored in nonvolatile circuitry and remains stable across temperature and time unless explicitly reprogrammed using the VP-based VTRIP set sequence documented in FN8131 Rev 3.00.
Does X5325S8I support active-low reset output?
No, the X5325S8I provides an active-high RESET output only. Its sister part X5323S8I offers active-low RESET/RESET. The X5325S8I pin 8 is labeled RESET and asserts HIGH during power-up, brown-out, or watchdog timeout - requiring an external pull-down or inverter if active-low logic is needed.
How is the watchdog timeout period selected on X5325S8I?
The watchdog timeout on X5325S8I is selected by programming nonvolatile WD0 and WD1 bits in the status register using the WRSR instruction. Valid combinations are: WD1=1,WD0=0 → 200ms; WD1=0,WD0=1 → 600ms; WD1=0,WD0=0 → 1.4s. The watchdog is disabled by default (WD1=1,WD0=1) and remains disabled until explicitly enabled.
Can X5325S8I's EEPROM be written while the watchdog is enabled?
Yes, X5325S8I allows simultaneous EEPROM writes and watchdog operation. The watchdog timer runs independently of SPI activity; however, CS/WDI must be toggled HIGH-to-LOW within the selected timeout period to prevent reset assertion - meaning firmware must interleave watchdog refreshes with EEPROM write sequences.
What is the maximum clock frequency supported by X5325S8I's SPI interface?
The X5325S8I supports SPI clock frequencies up to 2MHz under all operating conditions (2.7V–5.5V). This is verified in the AC Electrical Specifications table on page 11 of FN8131 Rev 3.00, with tCYC ≤ 500ns and timing margins maintained across industrial temperature range.
X5325S8I 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
X5325S8I FAQ
1.How can I place an order for X5325S8I through Aetrix?
Please submit a Request for Quotation (RFQ) for X5325S8I 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 X5325S8I reliable?
The price and inventory of X5325S8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5325S8I is usually 5 days.
3.What payment methods are accepted for X5325S8I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5325S8I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5325S8I?
X5325S8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5325S8I 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 X5325S8I?
For technical support, including X5325S8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5325S8I requirements.
6.How does Aetrix verify that X5325S8I is sourced from the original manufacturer or authorized distributors?
All X5325S8I 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 X5325S8I meets industry standards.
7.What is the process for return or replacement of X5325S8I?
All X5325S8I units undergo pre-shipment inspection (PSI). If there is an issue with X5325S8I, 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 X5325S8I part is unused and in its original packaging.
Return procedure for X5325S8I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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