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Renesas X5325S8I-2.7A
- Part No.:
- X5325S8I-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5325S8I-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,125
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Product details
Overview
X5325S8I-2.7A from Intersil is an active-high CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 32kbit SPI EEPROM in a single 8-lead SOIC package. It operates across 2.7V–5.5V VCC, features factory-programmable 2.85V–3.0V reset threshold (VTRIP), supports 2MHz SPI interface (modes 0,0 and 1,1), and delivers <1µA standby current with watchdog disabled - enabling reliable system monitoring in battery-powered industrial controllers.
For engineers reviewing the X5325S8I-2.7A datasheet, X5325S8I-2.7A pinout, X5325S8I-2.7A application, or X5325S8I-2.7A equivalent, this device serves as a drop-in replacement for legacy X25325 variants in microcontroller-based systems requiring deterministic reset timing, configurable watchdog timeout, nonvolatile configuration storage, and brown-out protection down to 1V.
Technical Context
The X5325S8I-2.7A implements a dual-function CS/WDI pin that enables both chip select and watchdog input functionality, with watchdog timeout selectable via nonvolatile WD0/WD1 bits (200ms, 600ms, or 1.4s). Its reset logic asserts RESET/RESET active-high when VCC falls below the programmed 2.92V (typ) trip point and holds it active for ≥200ms after VCC recovers.
Internally, the device combines three independent functional blocks: a precision low-VCC detector with reprogrammable threshold, a self-timed watchdog timer with volatile flag bit for reset source identification, and a block-lock protected 32kbit (4k × 8) SPI EEPROM with page-write capability (32-byte pages, 10ms typical write cycle), all sharing a common SPI bus (SI/SO/SCK/CS/WDI).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports wide-input industrial and battery-powered systems without external regulators. |
| VTRIP Threshold | 2.85V to 3.0V (typ 2.92V) - factory-set, reprogrammable reset voltage optimized for 3.3V logic domains. |
| Watchdog Timeout | Selectable 200ms / 600ms / 1.4s - nonvolatile setting ensures consistent behavior across power cycles. |
| EEPROM Capacity | 32kbit (4096 × 8) - sufficient for firmware versioning, calibration data, and field-upgradable configuration storage. |
| SPI Interface Speed | Up to 2MHz - compatible with standard microcontroller SPI peripherals without clock divider tuning. |
| Standby Current | <1µA (WDT off) - extends battery life in always-on monitoring applications such as remote sensors. |
| Reset Valid Voltage | 1V - guarantees reliable reset assertion during deep brown-out conditions before logic fails. |
Pinout & Package
Package: 8-lead SOIC (Pb-free, RoHS compliant), 3.9mm × 4.9mm footprint, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS/WDI | Chip Select / Watchdog Input | Dual-role pin: LOW enables SPI communication; HIGH-to-LOW transition resets watchdog timer. |
| 2 SO | Serial Output | Push-pull output delivering read data MSB-first on SCK falling edge; high-impedance when CS HIGH. |
| 3 WP | Write Protect | Hardware lock for status register writes when WPEN bit = 1; enables in-circuit programmable ROM mode. |
| 4 VSS | Ground | Reference return path for all internal circuits and I/O pins; must be connected to system GND plane. |
| 5 SI | Serial Input | Input for opcodes, addresses, and data; latched on SCK rising edge; MSB-first protocol enforced. |
| 6 SCK | Serial Clock | Master-generated clock controlling SPI timing; rising edge latches SI, falling edge drives SO. |
| 7 RESET/RESET | Active-High Reset Output | Open-drain output asserted HIGH during power-up, brown-out, or watchdog timeout; requires external pull-down. |
| 8 VCC | Supply Voltage | Primary power input for all functions; powers reset circuitry down to 1V and enables EEPROM access at ≥2.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Threshold voltage adjustable in-system using VP programming sequence - eliminates need for BOM changes when fine-tuning reset points. |
| Volatile Reset Source Flag | Flag bit distinguishes watchdog-initiated vs. low-VCC reset events - enables targeted recovery routines in firmware. |
| Block Lock™ EEPROM Protection | Nonvolatile BL0/BL1 bits allow selective write-protection of 0%, 25%, 50%, or 100% of memory array - prevents accidental overwrites of critical calibration data. |
| Self-Timed EEPROM Writes | Internal timing eliminates host MCU wait states; 10ms typical write cycle ensures predictable latency for configuration updates. |
| Power-Up Reset at 1V | Asserts RESET/RESET before VCC reaches logic-valid levels - prevents metastability and undefined processor startup behavior. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Real-time motor control and safety-critical dose delivery governed by ARM Cortex-M4 MCU. IC Role / Device Role / Timing Role: Active-high reset supervisor ensuring deterministic boot after power interruption and watchdog-enforced firmware execution integrity. Use Value: Prevents unsafe actuation during brown-out by asserting RESET/RESET down to 1V and storing pump calibration constants in protected EEPROM sectors. |
Use Scenario: Battery-operated portable infusion device requiring >5-year shelf life and field-updatable therapy profiles. IC Role / Device Role / Timing Role: Low-power supervisor with <1µA standby current and 32kbit EEPROM for encrypted therapy logs and regulatory audit trails. Use Value: Enables secure, tamper-resistant storage of usage history and firmware signatures while maintaining sub-µA sleep current for extended battery runtime. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: ANSI C12.20-compliant meter with anti-tampering features and time-of-use tariff storage. IC Role / Device Role / Timing Role: Voltage supervisor with reprogrammable 2.92V VTRIP and Block Lock™ EEPROM protecting tariff tables and metering registers. Use Value: Guarantees accurate energy measurement during grid sags by holding MCU in reset until stable 3.3V rail is restored, with nonvolatile configuration immune to ESD upset. |
Use Scenario: CAN-connected BCM managing door locks, lighting, and diagnostics in 12V automotive electrical architecture. IC Role / Device Role / Timing Role: Supervisor providing 200ms power-up reset delay and watchdog timeout to prevent latch-up during cold-crank transients. Use Value: Ensures fail-safe operation during battery voltage dips to 6V by maintaining RESET/RESET assertion until VCC exceeds 2.85V and stabilizes for 200ms. |
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; 16kbit EEPROM; 5-pin SOT23 package. | Lacks configurable watchdog timeout and block-lock protection; limited memory for complex configuration sets. | Choose for space-constrained designs where fixed reset point suffices and EEPROM size requirements are ≤16kbit. |
| STM8AF6266TCY | MCU-based solution with embedded 32kbit EEPROM and software-configurable reset/watchdog; requires firmware development. | Higher BOM cost and design effort; offers flexible timing but lacks hardware-level brown-out detection accuracy. | Choose only when system already uses STM8AF platform and requires custom reset sequencing logic beyond fixed-function supervisors. |
Compared with MAX6361KA29+T and STM8AF6266TCY, the X5325S8I-2.7A delivers guaranteed hardware reset accuracy, field-reprogrammable VTRIP, and dedicated block-lock EEPROM protection - reducing qualification risk in safety-critical industrial and medical deployments where deterministic behavior is mandated.
Availability
X5325S8I-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply with long-term lifecycle support.
Supply support for X5325S8I-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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and medical applications.
The X5325 product line was designed to consolidate power monitoring, reset generation, and nonvolatile storage into a single IC - targeting cost-sensitive, space-constrained embedded systems needing high reliability without firmware overhead.
FAQ
What is the factory-default watchdog timeout setting for X5325S8I-2.7A?
The X5325S8I-2.7A ships with the watchdog timer disabled (WD1 = 1, WD0 = 1). To enable it, the system must issue a WRSR instruction to program WD0/WD1 to one of the active combinations (00, 01, or 10), which then persists across power cycles. This default ensures safe out-of-box operation without unintended resets.
Can the VTRIP threshold of X5325S8I-2.7A be adjusted after soldering onto the PCB?
Yes, the VTRIP threshold of X5325S8I-2.7A can be reprogrammed in-system using the VP programming sequence described in the datasheet. It requires applying 15–18V to SCK and SI while holding CS/WDI and WP HIGH, then pulsing CS/WDI LOW-HIGH. No de-soldering or special equipment is needed.
How does X5325S8I-2.7A protect against accidental EEPROM writes during power transitions?
X5325S8I-2.7A employs three layers of protection: (1) Power-up/power-down detection circuitry that disables writes below 2.7V, (2) mandatory WREN instruction before any write, and (3) Block Lock™ bits (BL0/BL1) that permanently protect memory segments when configured. The WP pin further locks status register writes when WPEN = 1.
Is X5325S8I-2.7A pin-compatible with earlier X25325 variants?
Yes, X5325S8I-2.7A is a direct replacement for X25325S8I-2.7A and other X25325 family members in the same 8-lead SOIC package. Pin assignments, electrical characteristics, and command set are identical - enabling drop-in upgrades without PCB or firmware changes.
What is the maximum operating temperature range supported by X5325S8I-2.7A?
X5325S8I-2.7A is rated for the industrial temperature range of –40°C to +85°C, as confirmed by its ordering suffix "I" and compliance with Intersil's industrial-grade thermal specifications. This makes it suitable for deployment in harsh environments including factory automation and outdoor metering equipment.
X5325S8I-2.7A 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:
- 2.92V
- 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-2.7A FAQ
1.How can I place an order for X5325S8I-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X5325S8I-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 X5325S8I-2.7A reliable?
The price and inventory of X5325S8I-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 X5325S8I-2.7A is usually 5 days.
3.What payment methods are accepted for X5325S8I-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5325S8I-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5325S8I-2.7A?
X5325S8I-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5325S8I-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 X5325S8I-2.7A?
For technical support, including X5325S8I-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5325S8I-2.7A requirements.
6.How does Aetrix verify that X5325S8I-2.7A is sourced from the original manufacturer or authorized distributors?
All X5325S8I-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 X5325S8I-2.7A meets industry standards.
7.What is the process for return or replacement of X5325S8I-2.7A?
All X5325S8I-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X5325S8I-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 X5325S8I-2.7A part is unused and in its original packaging.
Return procedure for X5325S8I-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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