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Renesas X5323S8I-4.5A
- Part No.:
- X5323S8I-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X5323S8I-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,034
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Product details
Overview
X5323S8I-4.5A from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 32kbit SPI EEPROM in an 8-lead SOIC package. It asserts active-low RESET at VCC < 4.5V (typ. 4.63V), supports selectable watchdog timeouts (200ms/600ms/1.4s), and operates from 4.5V to 5.5V with <50µA standby current (WDT on). It is used in industrial microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.
For engineers reviewing the X5323S8I-4.5A datasheet, X5323S8I-4.5A pinout, X5323S8I-4.5A application, or X5323S8I-4.5A equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in FN8131 Rev 3.00 and Intersil's official specifications.
Technical Context
The X5323S8I-4.5A implements a dual-function CS/WDI pin for chip select and watchdog input, with a volatile flag bit distinguishing watchdog vs. low-voltage reset causes. Its reset logic asserts RESET/RESET down to VCC = 1V and holds it active for 200ms after VCC exceeds the 4.5–4.75V trip threshold.
It features a programmable VTRIP threshold (factory-set to 4.5–4.75V for -4.5A variants) that can be reprogrammed via VP pulses on SCK/SI, and integrates Block Lock™ EEPROM protection enabling 0%, 25%, 50%, or 100% array write lock with nonvolatile status register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.5–4.75V (min/typ/max); ensures system reset before microcontroller enters unstable operation during 5V rail brown-out. |
| Watchdog Timeout | 200ms (WD1=1, WD0=0); provides fast fault recovery for time-critical embedded firmware loops. |
| EEPROM Size | 32kbit (4k × 8); stores calibration data, device ID, or firmware configuration without external memory. |
| Supply Range | 4.5V to 5.5V; compatible with standard 5V logic rails and tolerant of ±5% regulation variation. |
| Standby Current | <50µA max (WDT enabled); enables long-term battery-backed operation in always-on monitoring systems. |
| SPI Speed | 2MHz max (modes 0,0 and 1,1); supports high-throughput configuration reads/writes with common MCU SPI peripherals. |
| Reset Pulse Width | 200ms (typical); guarantees sufficient hold time for oscillator stabilization and processor core initialization. |
Pinout & Package
Package: 8-lead SOIC (Pb-free, RoHS compliant), body width 3.9mm, lead 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 output delivering read data MSB-first; no external pull-up required for clean signal integrity. |
| 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 | Primary reference for all digital and analog circuitry; must be low-impedance connection to avoid reset timing jitter. |
| 5 SI | Serial Input | Latches instruction/address/data on rising SCK edge; accepts WREN, READ, WRITE, and WRSR opcodes per Table 1. |
| 6 SCK | Serial Clock | Controls SPI timing; rising edge clocks inputs, falling edge outputs data - supports pause/resume operation. |
| 7 RESET/RESET | Reset Output | Open-drain active-low output; requires external pull-up; asserts at VCC ≤ 4.5V and remains active until VCC > VTRIP + 200ms. |
| 8 VCC | Supply Voltage | Power input for entire device; powers reset logic, watchdog, EEPROM, and SPI interface; valid from 4.5V to 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Reprogrammable VTRIP | Voltage threshold adjustable in-system using VP pulses on SCK/SI - eliminates need for custom BOMs across voltage variants. |
| Block Lock™ EEPROM Protection | Nonvolatile BL0/BL1 bits allow locking 0%, 25%, 50%, or 100% of 32kbit array - prevents field firmware corruption while permitting partial updates. |
| Volatile Reset Cause Flag | FLAG bit (set/reset via SFLB/RFLB) distinguishes watchdog timeout from low-VCC reset - enables targeted diagnostics in failure logs. |
| Self-timed EEPROM Writes | 5ms typical write cycle (32-byte page mode); removes software timing dependencies and simplifies driver implementation. |
| Low-VCC Valid Reset | RESET/RESET asserted down to VCC = 1V - ensures deterministic behavior even during deep brown-out or battery depletion. |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
|
Use Scenario: Real-time monitoring of motor drivers and analog sensor inputs under variable 5V supply conditions. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brown-out detection, and watchdog supervision; EEPROM stores calibration coefficients and usage logs. Use Value: Prevents erratic actuator behavior during line fluctuations by asserting RESET below 4.5V and enabling firmware recovery within 200ms. |
Use Scenario: Safety-critical delivery of precise drug dosages where firmware integrity and power stability are mandatory. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5V rail for brown-out and resets MCU if watchdog is not serviced; EEPROM retains dose history and error codes. Use Value: Guarantees fail-safe shutdown below 4.5V and supports traceability via tamper-resistant EEPROM logging with Block Lock™ protection. |
| Smart Energy Meter | Automotive Body Control Module (BCM) |
|
Use Scenario: Long-life meter operating from utility-supplied 5V with infrequent firmware updates and lifetime calibration storage. IC Role / Device Role / Timing Role: Supervisor ensures clean boot after power restoration; EEPROM stores tariff tables and metering constants with 100-year retention. Use Value: Eliminates external reset IC and serial EEPROM, reducing BOM count and PCB area while meeting IEC 62053 accuracy requirements. |
Use Scenario: CAN-connected lighting and window control unit exposed to automotive load-dump transients and cold-crank voltage dips. IC Role / Device Role / Timing Role: Monitors 5V domain for undervoltage events; asserts RESET during cranking (VCC < 4.5V) and logs fault codes to EEPROM. Use Value: Maintains functional safety by preventing undefined MCU state during 4.0–4.5V transients and enabling post-failure diagnostics via protected EEPROM. |
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 programming; 16kbit EEPROM; 3.0–5.5V supply. | Lacks reprogrammable VTRIP and 32kbit capacity; suitable only for fixed-threshold 3V/5V hybrid systems. | Select only if VTRIP adjustment is unnecessary and EEPROM size ≥16kbit suffices. |
| STM8AF6266TCY | MCU-based solution with internal 2kbyte EEPROM and configurable reset logic; requires firmware development. | Not a drop-in replacement; adds software overhead and validation burden; no hardware watchdog independence. | Choose only when system already uses STM8A platform and requires tight integration of supervision logic with application code. |
Compared with MAX6361KA29+T and STM8AF6266TCY, the X5323S8I-4.5A uniquely combines field-programmable VTRIP, 32kbit EEPROM, and hardware watchdog independence - enabling faster qualification, smaller footprint, and higher reliability in 5V industrial designs without MCU dependency.
Availability
X5323S8I-4.5A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pump controllers, smart energy meters, automotive body control modules, and embedded telemetry gateways requiring stable component supply across extended temperature ranges.
Supply support for X5323S8I-4.5A 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 communications markets.
The X5323 product line was designed to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage into a single 8-pin package - targeting cost-sensitive, space-constrained embedded systems needing guaranteed boot integrity and field-configurable thresholds.
FAQ
What is the factory-default VTRIP setting for X5323S8I-4.5A?
The X5323S8I-4.5A ships with a factory-programmed VTRIP range of 4.5V to 4.75V (min to max), with a typical value of 4.63V. This threshold is fixed unless reprogrammed using the VP pulse sequence on SCK and SI pins as defined in FN8131 Rev 3.00 Section 4. The reset remains active until VCC exceeds this threshold for 200ms.
Does X5323S8I-4.5A support both active-high and active-low reset outputs?
No - the X5323S8I-4.5A provides only an active-low RESET/RESET output. The "X5323" prefix denotes active-low reset; active-high variants are designated "X5325" (e.g., X5325S8I-4.5A). Pin 7 function and internal logic are hardwired for low-assertion behavior, and no configuration register controls polarity.
How is the watchdog timeout period selected on X5323S8I-4.5A?
The watchdog timeout on X5323S8I-4.5A is set via two nonvolatile bits (WD1, WD0) in the status register, programmed using the WRSR instruction. Valid combinations are: WD1=1, WD0=0 → 200ms; WD1=0, WD0=1 → 600ms; WD1=0, WD0=0 → 1.4s; WD1=1, WD0=1 → disabled (factory default). These values persist across power cycles.
Can the EEPROM in X5323S8I-4.5A be partially protected against writes?
Yes - the X5323S8I-4.5A supports four levels of Block Lock™ protection via BL0/BL1 bits: none (factory default), lower 1k bytes ($0C00–$0FFF), lower 2k bytes ($0800–$0FFF), or full 4k-byte array ($0000–$0FFF). Protection is nonvolatile and enforced in hardware, allowing read access but blocking writes to locked regions.
What is the maximum SPI clock frequency supported by X5323S8I-4.5A?
The X5323S8I-4.5A supports SPI clock frequencies up to 2MHz, compliant with modes 0,0 and 1,1. Timing parameters including tCYC (500ns min), tSU (50ns min), and tH (50ns min) are specified over the full 4.5V–5.5V supply range and −40°C to +85°C temperature range per FN8131 Rev 3.00 AC Electrical Specifications.
X5323S8I-4.5A 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:
- 4.63V
- 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
X5323S8I-4.5A FAQ
1.How can I place an order for X5323S8I-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X5323S8I-4.5A 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 X5323S8I-4.5A reliable?
The price and inventory of X5323S8I-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5323S8I-4.5A is usually 5 days.
3.What payment methods are accepted for X5323S8I-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5323S8I-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X5323S8I-4.5A?
X5323S8I-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X5323S8I-4.5A 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 X5323S8I-4.5A?
For technical support, including X5323S8I-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5323S8I-4.5A requirements.
6.How does Aetrix verify that X5323S8I-4.5A is sourced from the original manufacturer or authorized distributors?
All X5323S8I-4.5A 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 X5323S8I-4.5A meets industry standards.
7.What is the process for return or replacement of X5323S8I-4.5A?
All X5323S8I-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X5323S8I-4.5A, 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 X5323S8I-4.5A part is unused and in its original packaging.
Return procedure for X5323S8I-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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