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Renesas X5325S8IZ-2.7
- Part No.:
- X5325S8IZ-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5325S8IZ-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,636
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Product details
Overview
X5325S8IZ-2.7 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 2.7V to 5.5V, features a factory-programmed 2.85–3.0V reset threshold, supports -40°C to +85°C industrial temperature range, and delivers active-low RESET output valid down to VCC = 1V - used in embedded microcontroller systems requiring reliable boot sequencing and brown-out protection.
For engineers reviewing the X5325S8IZ-2.7 datasheet, X5325S8IZ-2.7 pinout, X5325S8IZ-2.7 application, or X5325S8IZ-2.7 equivalent, this device serves as a system-level supervisory solution where deterministic reset timing, reprogrammable VTRIP, nonvolatile watchdog configuration, and on-chip EEPROM for calibration or firmware storage are required.
Technical Context
The X5325S8IZ-2.7 implements a dual-function CS/WDI pin that enables both chip select and watchdog input functionality, with watchdog timeout periods (200ms, 600ms, or 1.4s) selected via nonvolatile WD0/WD1 bits in the status register. Its low-voltage detection circuit asserts RESET/RESET when VCC falls below the 2.85–3.0V trip point and holds it active for ≥200ms after VCC recovers.
It integrates a 32kbit (4k × 8) SPI EEPROM with Block Lock™ protection, supporting page writes (32-byte), self-timed internal write cycles (10ms typical), and direct SPI interface compatibility (modes 0,0 and 1,1) at up to 2MHz. The device includes a volatile flag bit to distinguish watchdog resets from low-voltage resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports wide-input industrial power rails without external regulators. |
| VTRIP Threshold | 2.85V to 3.0V (typ. 2.92V) - factory-set reset trip point optimized for 3.3V systems with 20mV hysteresis. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - nonvolatile setting persists across power cycles. |
| EEPROM Size | 32kbit (4096 × 8) - sufficient for bootloader parameters, calibration data, or device identity storage. |
| Standby Current | <1µA (WDT off) or <20µA (WDT on @ 3.6V) - enables ultra-low-power operation in battery-backed systems. |
| SPI Interface | 2MHz max clock, modes 0,0 and 1,1 - compatible with standard microcontroller SPI peripherals without custom timing logic. |
| Reset Output | Active-low open-drain RESET/RESET - supports wired-OR configurations and level-shifting with external pull-up. |
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 | Active-low enable for SPI commands; falling edge restarts watchdog timer - dual-role pin reduces board routing complexity. |
| 2: SO | Serial Output | Push-pull data output synchronized to SCK falling edge - eliminates need for external pull-up on read paths. |
| 3: WP | Write Protect | Hardware lock for status register writes when WPEN bit is set - prevents accidental corruption of watchdog or block-lock settings. |
| 4: VSS | Ground | Reference return path for all digital and analog functions - must be connected to system ground plane for stable reset timing. |
| 5: VCC | Supply Voltage | Primary power input (2.7–5.5V); powers reset generator, watchdog, EEPROM, and SPI interface - valid down to 1V for reset assertion. |
| 6: SI | Serial Input | Data/address/instruction input latched on SCK rising edge - MSB-first protocol ensures deterministic command parsing. |
| 7: SCK | Serial Clock | Master-generated clock controlling SPI timing - supports 0–2MHz operation with defined setup/hold requirements. |
| 8: RESET/RESET | Reset Output | Open-drain active-low reset signal asserted during power-up, brown-out, or watchdog timeout - requires external pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Voltage threshold can be adjusted in-circuit using VP programming sequence - enables field calibration for precision brown-out detection. |
| Block Lock™ EEPROM Protection | Nonvolatile BL0/BL1 bits allow locking 0%, 25%, 50%, or 100% of EEPROM array - prevents firmware corruption while permitting runtime parameter updates. |
| Volatile Reset Source Flag | Flag bit distinguishes watchdog-initiated vs. low-voltage reset - enables diagnostic logging and targeted recovery routines in host firmware. |
| Power-Up Reset Validity | RESET/RESET asserted down to VCC = 1V and held for 100–280ms - guarantees processor remains held until oscillator stabilizes even under slow-ramp supplies. |
| In-Circuit Programmable ROM Mode | WP pin + WPEN bit combination disables status register writes - allows manufacturing to pre-configure device and lock settings permanently. |
Applications
| Industrial PLC Controller | Medical Sensor Module |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controller operating in harsh environments with fluctuating 3.3V supply rails. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brown-out detection at 2.92V, and watchdog monitoring of main application loop. Use Value: Prevents erratic execution during undervoltage conditions and enables automatic recovery from software hangs without manual intervention. |
Use Scenario: Portable patient monitor storing calibration coefficients and usage logs in nonvolatile memory. IC Role / Device Role / Timing Role: Integrated EEPROM + supervisor managing sensor offset compensation data and ensuring safe boot before ADC initialization. Use Value: Eliminates need for discrete reset IC and external EEPROM, reducing BOM count and PCB area while guaranteeing data integrity during power transitions. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Revenue-grade electricity meter requiring tamper-proof storage of billing data and firmware versioning. IC Role / Device Role / Timing Role: Supervisor with Block Lock™-protected EEPROM storing tariff tables and cryptographic keys. Use Value: Enables secure, field-upgradable configuration storage with hardware-enforced write protection against unauthorized modification. |
Use Scenario: Low-power vehicle interior lighting controller powered from 12V rail via LDO, subject to load-dump transients. IC Role / Device Role / Timing Role: System supervisor asserting RESET/RESET during VCC dips below 2.92V and enabling watchdog recovery of CAN communication stack. Use Value: Maintains functional safety by preventing undefined MCU states during battery voltage sags, meeting ISO 16750-2 transient immunity requirements. |
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 reprogrammable VTRIP; 16kbit EEPROM; no watchdog timer. | Lacks configurable watchdog and VTRIP adjustment - suitable only for simple reset-only use cases without runtime diagnostics. | Choose when minimal feature set suffices and EEPROM size requirement is ≤16kbit. |
| STM6803RWDY6F | 2.93V reset threshold; no EEPROM; standalone supervisor with watchdog and reset delay; 3-pin SOT23 package. | No integrated memory - requires external EEPROM or flash for parameter storage, increasing component count and layout complexity. | Choose when supervisory function is primary need and memory is handled separately via larger external storage. |
Compared with MAX6361KA29+T and STM6803RWDY6F, the X5325S8IZ-2.7 uniquely combines field-adjustable reset threshold, nonvolatile watchdog configuration, and 32kbit block-locked EEPROM in one SOIC-8 package - delivering higher integration density and diagnostic capability for resource-constrained embedded systems.
Availability
X5325S8IZ-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for X5325S8IZ-2.7 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 X5325 product line was designed to consolidate critical system supervision functions - reset generation, watchdog monitoring, voltage monitoring, and nonvolatile storage - into a single cost-effective, space-saving device for microcontroller-based embedded systems.
FAQ
What is the factory-default reset threshold voltage for X5325S8IZ-2.7?
The X5325S8IZ-2.7 ships with a factory-programmed VTRIP range of 2.85V to 3.0V (typical 2.92V), optimized for 3.3V supply systems. This threshold is nonvolatile and remains fixed unless explicitly reprogrammed using the VP-based VTRIP adjustment sequence documented in the FN8131 datasheet. The hysteresis is 20mV to prevent chatter near the trip point.
Does X5325S8IZ-2.7 support both active-high and active-low reset outputs?
No - X5325S8IZ-2.7 provides an active-low open-drain RESET/RESET output only. The "X5325" suffix denotes active-high reset variants (e.g., X5325S8IZ-4.5A), but the X5325S8IZ-2.7 variant is specifically configured for active-low operation. Its RESET/RESET pin asserts low during power-up, brown-out, or watchdog timeout and requires an external pull-up resistor to VCC.
How is the watchdog timer enabled and configured on X5325S8IZ-2.7?
The watchdog timer on X5325S8IZ-2.7 is disabled at power-up (WD1=1, WD0=1). To enable it, the host microcontroller must issue a WRSR instruction to write WD0/WD1 bits in the status register. Valid timeout periods are 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0). Once set, these bits persist across power cycles unless rewritten.
Can the EEPROM in X5325S8IZ-2.7 be written while the watchdog timer is active?
Yes - the EEPROM and watchdog functions operate independently. Writing to the 32kbit SPI EEPROM does not interfere with watchdog timer operation, and the CS/WDI pin continues to accept watchdog restart pulses during EEPROM read/write sequences. However, the write-enable latch (WEL) must be set via WREN before any EEPROM write, and the WP pin must be high or WPEN=0 to allow writes.
What is the maximum SPI clock frequency supported by X5325S8IZ-2.7?
X5325S8IZ-2.7 supports SPI clock frequencies up to 2MHz across its full 2.7V–5.5V VCC range. Timing specifications including tSU (50ns), tH (50ns), tWH (200ns), and tWL (250ns) are guaranteed over temperature and voltage. Operation below 2MHz is permitted and commonly used to ensure robustness in electrically noisy environments.
X5325S8IZ-2.7 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:
- 2.63V
- 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
X5325S8IZ-2.7 FAQ
1.How can I place an order for X5325S8IZ-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X5325S8IZ-2.7 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 X5325S8IZ-2.7 reliable?
The price and inventory of X5325S8IZ-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5325S8IZ-2.7 is usually 5 days.
3.What payment methods are accepted for X5325S8IZ-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5325S8IZ-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5325S8IZ-2.7?
X5325S8IZ-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5325S8IZ-2.7 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 X5325S8IZ-2.7?
For technical support, including X5325S8IZ-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5325S8IZ-2.7 requirements.
6.How does Aetrix verify that X5325S8IZ-2.7 is sourced from the original manufacturer or authorized distributors?
All X5325S8IZ-2.7 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 X5325S8IZ-2.7 meets industry standards.
7.What is the process for return or replacement of X5325S8IZ-2.7?
All X5325S8IZ-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X5325S8IZ-2.7, 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 X5325S8IZ-2.7 part is unused and in its original packaging.
Return procedure for X5325S8IZ-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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