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Renesas X5328S8I
- Part No.:
- X5328S8I
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5328S8I.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
X5328S8I from Renesas Electronics is a CPU supervisor IC integrating power-on reset control, supply voltage supervision, and 32Kbit SPI EEPROM in an 8-lead SOIC package. It asserts active-low RESET during power-up (≥100ms) and low-VCC conditions, supports reprogrammable VTRIP thresholds (2.55–4.75V), and delivers <1µA standby current for battery-sensitive embedded systems.
For engineers reviewing the X5328S8I datasheet, X5328S8I pinout, X5328S8I application, or X5328S8I equivalent, this device serves as a system-level power integrity and nonvolatile configuration storage solution-particularly where board space, supply margin tolerance, and in-circuit programmable ROM mode are critical selection criteria.
Technical Context
The X5328S8I implements dual-function supervision: a precision low-VCC detector with user-reprogrammable trip point (via VP-programmed sequence on SCK/SI) and a power-on reset timer with 200ms timeout after VCC stabilization. Its internal reset logic drives an open-drain RESET/RESET output valid down to VCC = 1V.
Its SPI EEPROM subsystem operates at up to 2MHz (modes 0,0 and 1,1), supports 32-byte page writes with self-timed 5ms typical write cycles, and includes Block Lock™ protection (0/¼/½/all array) controlled via nonvolatile status register bits BL0/BL1 and WPEN.
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 | 2.55V to 4.75V - factory-set or field-reprogrammable to match precise supply rail margins |
| Reset Output Type | Active-low open-drain - enables wired-OR reset bus configurations and flexible pull-up voltage selection |
| EEPROM Capacity | 32Kbit (4K × 8) - sufficient for bootloader parameters, calibration data, and device identity storage |
| Standby Current | <1µA at VCC = 5.5V - extends battery life in always-on monitoring nodes |
| SPI Clock Frequency | Up to 2MHz - compatible with mid-speed microcontroller SPI peripherals without timing constraints |
| Write Endurance | 100,000 cycles - ensures long-term reliability for firmware update logging and runtime configuration |
Pinout & Package
Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, moisture sensitivity level per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Enables SPI interface; HIGH places device in standby (<1µA), LOW initiates command/address/data transfer |
| 2 SO | Serial Output | Push-pull data output; clocks data out on falling SCK edge during READ/RDSR operations |
| 3 WP | Write Protect Input | Hardware lock for Status Register when WPEN = 1 - enables in-circuit programmable ROM mode |
| 4 VSS | Ground Reference | Primary return path for all internal circuits and I/O drivers; requires low-impedance PCB connection |
| 5 SI | Serial Input | Latches opcode/address/data on rising SCK edge; MSB-first protocol required for all instructions |
| 6 SCK | Serial Clock | Master-controlled clock; rising edge samples SI, falling edge updates SO; static-compatible for pause/resume |
| 7 RESET/RESET | Reset Output | Open-drain active-low signal asserted during power-up (tPURST = 200ms typ.) and VCC < VTRIP |
| 8 VCC | Supply Voltage | Primary power input; powers both supervisor logic and EEPROM array; supports 2.7–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Field-adjustable reset threshold (2.55–4.75V) using VP pulses on SCK/SI - eliminates need for BOM variants |
| Block Lock™ Protection | Nonvolatile BL0/BL1 bits enable selective write-protection of 0%, 25%, 50%, or 100% of EEPROM - prevents accidental firmware corruption |
| In-Circuit Programmable ROM Mode | WP pin + WPEN bit combination disables Status Register writes - allows manufacturing to lock configuration post-programming |
| Low-VCC Reset Validity | RESET remains functional down to VCC = 1V - guarantees safe processor halt during deep brownout |
| Self-Timed EEPROM Writes | 5ms typical write cycle with automatic internal timing - removes software wait-state overhead |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Real-time control logic must halt immediately upon AC mains dropout or battery sag below 3.0V. IC Role / Device Role / Timing Role: X5328S8I monitors 3.3V rail and asserts RESET within 500ns of VCC falling below 2.85V, holding processor in reset until stable recovery. Use Value: Prevents erratic motor actuation or dosage miscalculation during transient undervoltage events. |
Use Scenario: Device stores calibrated flow-rate coefficients and usage logs across 10+ years of clinical service. IC Role / Device Role / Timing Role: X5328S8I provides 32Kbit EEPROM with 100-year data retention and Block Lock™ protection for critical calibration blocks. Use Value: Ensures regulatory compliance by preventing unauthorized modification of safety-critical parameters. |
| Smart Energy Meter | Automotive Telematics Module |
Use Scenario: Meter operates from utility line (220VAC rectified) and backup supercapacitor; must survive 100ms grid interruption. IC Role / Device Role / Timing Role: X5328S8I's 200ms power-up reset timeout and 2.55V VTRIP ensure MCU initialization only after capacitor voltage stabilizes above operating threshold. Use Value: Eliminates boot failures and flash corruption during frequent AC cycling in smart-grid deployments. |
Use Scenario: Module logs GPS position, CAN bus diagnostics, and firmware version across vehicle lifetime. IC Role / Device Role / Timing Role: X5328S8I's <1µA standby current and -40°C to +85°C rating enable reliable data logging in under-hood thermal environments. Use Value: Reduces system-level power budget while maintaining 100,000-cycle endurance for diagnostic history storage. |
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; 3-wire microwire interface | Lacks field-adjustable supervision and SPI compatibility - unsuitable for systems requiring custom trip points or SPI-native microcontrollers | Select only if fixed-threshold supervision and smaller memory suffice, and microwire interface is already implemented. |
| STM8AF6266TCY | Embedded 8-bit MCU with 32KB Flash and hardware watchdog; no dedicated EEPROM; requires external SPI EEPROM for nonvolatile storage | Integrates processing but adds software complexity and BOM cost for external memory - no monolithic reset+EEPROM function | Choose only when firmware-defined reset logic and code execution are required alongside storage; not a drop-in replacement. |
Compared with MAX6361KA29+T and STM8AF6266TCY, the X5328S8I uniquely combines field-programmable VTRIP, SPI-native 32Kbit EEPROM, and ultra-low standby current in a single 8-pin SOIC - delivering lower system cost, reduced layout area, and simplified qualification for power-critical embedded designs.
Availability
X5328S8I is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive telematics modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for X5328S8I 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and mixed-signal solutions for automotive, industrial, and IoT applications.
The X5328S8I belongs to Renesas' CPU Supervisor with Integrated EEPROM product line, designed to consolidate power monitoring, reset generation, and nonvolatile configuration storage into a single chip for space-constrained, high-reliability embedded systems.
FAQ
What is the operating temperature range for the X5328S8I?
The X5328S8I is rated for industrial operation from -40°C to +85°C. This range is confirmed in the Ordering Information table (X5328S8IZ and X5328S8IZT1 variants) and supported by DC operating characteristics tested across that full span. The device maintains specified VTRIP accuracy, tPURST timing, and EEPROM functionality throughout this range.
Does the X5328S8I support both active-high and active-low reset outputs?
No - the X5328S8I provides only an active-low RESET/RESET output. The datasheet explicitly identifies X5328 as the RESET variant (active-low) and distinguishes it from X5329 (RESET variant, active-high). The part number X5328S8I confirms it is the X5328 family member with active-low reset behavior.
Can the VTRIP voltage of the X5328S8I be changed after soldering to the PCB?
Yes - the X5328S8I supports in-system VTRIP reprogramming using a defined VP pulse sequence on SCK and SI pins while holding CS and WP HIGH. This allows field adjustment to match actual supply rail tolerances without requiring component replacement or board rework.
What EEPROM protection mechanisms does the X5328S8I provide?
The X5328S8I implements three layers: (1) Power-up/power-down write inhibit circuitry, (2) Block Lock™ protection (0/¼/½/all array) controlled by nonvolatile BL0/BL1 bits, and (3) In-Circuit Programmable ROM mode enabled by WP pin + WPEN bit - which permanently disables Status Register writes once activated.
Is the X5328S8I pin-compatible with other devices in the X5328/X5329 family?
Yes - all X5328 and X5329 variants in the 8-lead SOIC package (e.g., X5328S8Z, X5328S8IZT1, X5329S8Z) share identical pinout, footprint, and electrical interface. Differences are limited to VTRIP threshold, reset polarity (X5328 vs. X5329), temperature grade, and packaging - enabling direct substitution where those parameters align.
X5328S8I 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X5328S8I FAQ
1.How can I place an order for X5328S8I through Aetrix?
Please submit a Request for Quotation (RFQ) for X5328S8I 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 X5328S8I reliable?
The price and inventory of X5328S8I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5328S8I is usually 5 days.
3.What payment methods are accepted for X5328S8I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5328S8I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5328S8I?
X5328S8I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5328S8I 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 X5328S8I?
For technical support, including X5328S8I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5328S8I requirements.
6.How does Aetrix verify that X5328S8I is sourced from the original manufacturer or authorized distributors?
All X5328S8I 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 X5328S8I meets industry standards.
7.What is the process for return or replacement of X5328S8I?
All X5328S8I units undergo pre-shipment inspection (PSI). If there is an issue with X5328S8I, 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 X5328S8I part is unused and in its original packaging.
Return procedure for X5328S8I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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