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Renesas X4323S8-2.7
- Part No.:
- X4323S8-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4323S8-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
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Product details
Overview
X4323S8-2.7 from Xicor (now Renesas) is a CPU supervisor IC integrating power-on reset control, selectable watchdog timer, supply voltage supervision, and 32Kbit serial EEPROM in an 8-lead SOIC package. It features four standard VCC reset thresholds (including factory-set 2.7V), 400kHz I²C interface, <20µA standby current with watchdog enabled, and 5ms typical EEPROM write cycle time. It is used in embedded microcontroller systems requiring reliable power sequencing and nonvolatile configuration storage.
For engineers reviewing the X4323S8-2.7 datasheet, X4323S8-2.7 pinout, X4323S8-2.7 application, or X4323S8-2.7 equivalent, key selection criteria include its adjustable VTRIP threshold capability, dual-mode reset output (active-low/open-drain), hardware write protection via WP pin, and compatibility with standard 2-wire I²C timing at 400kHz.
Technical Context
The X4323S8-2.7 implements a dual-function reset architecture: power-on reset with 250ms timeout and low-VCC detection asserting RESET/RESET down to VCC = 1V. Its watchdog timer monitors SDA transitions during SCL HIGH and offers three fixed timeout periods (200ms, 600ms, 1.4s) controlled by nonvolatile WD1/WD0 bits.
EEPROM functionality includes 64-byte page write mode, self-timed internal write cycles, and multi-layer write protection-comprising volatile WEL/RWEL latches, nonvolatile Block Protect bits (BP2–BP0), and hardware lock via WP pin + WPEN bit. All serial communication follows strict I²C protocol conventions with start/stop conditions, ACK polling, and addressable random/sequential reads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports single-supply operation across industrial and automotive-grade logic rails. |
| Reset Threshold (VTRIP) | Factory-set to 2.7V - precise brownout detection point; reprogrammable to custom voltage via VP pulse on WP pin. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - configurable via nonvolatile WD1/WD0 bits; disabled by default. |
| EEPROM Capacity | 32Kbit (4K × 8) - organized as 512 pages of 64 bytes; enables firmware parameter storage without external memory. |
| I²C Interface Speed | 400kHz - full Fast-mode I²C compliance; allows high-throughput configuration updates in real-time systems. |
| Standby Current | <20µA (watchdog on) / <1µA (watchdog off) - ultra-low quiescent draw for battery-backed or energy-sensitive applications. |
| Reset Pulse Width | 250ms after VCC stabilization - ensures sufficient time for oscillator startup and FPGA configuration before MCU release. |
Pinout & Package
Package: 8-lead JEDEC SOIC (SO-8), body size 3.9mm × 4.9mm, pitch 1.27mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input - sets LSB of I²C slave address; tied HIGH/LOW to configure one of four device addresses. |
| 2 (SOIC) | S1 | Device select input - sets MSB of I²C slave address; enables multiple X4323S8-2.7 devices on same bus. |
| 3 (SOIC) | RESET/RESET | Active-low open-drain reset output - asserted during power-up, brownout, or watchdog timeout; requires external pull-up. |
| 4 (SOIC) | VSS | Ground reference - common return path for all internal circuits and I²C interface. |
| 5 (SOIC) | SDA | Serial data line - bidirectional I²C data pin with open-drain output; used for EEPROM read/write and watchdog reset signaling. |
| 6 (SOIC) | SCL | Serial clock input - master-generated I²C clock; synchronizes all data transfers and watchdog sampling windows. |
| 7 (SOIC) | WP | Write protect input - when HIGH and WPEN bit set, blocks all nonvolatile writes including control register and EEPROM. |
| 8 (SOIC) | VCC | Supply voltage input - powers all internal functions including reset generator, watchdog, and EEPROM array. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable VTRIP | Factory-set 2.7V threshold reprogrammable to custom voltage using 12–15V pulse on WP pin - eliminates need for external resistor dividers. |
| Dual-mode reset output | RESET/RESET pin operates as active-low open-drain signal compatible with both NMOS and CMOS logic families - simplifies interface to diverse host processors. |
| Hardware + software write protection | Combines WP pin + WPEN bit for hardware lock and BP2–BP0 bits for selective 64-byte to full-array block locking - prevents accidental firmware corruption during field updates. |
| Self-timed EEPROM writes | 5ms typical internal write cycle with automatic completion detection via ACK polling - removes need for fixed delay timers in host firmware. |
| Watchdog restart via I²C activity | SDA falling edge during SCL HIGH resets watchdog timer - leverages existing bus traffic instead of requiring dedicated GPIO or timer resources. |
Applications
| Industrial PLC Control | Medical Device Configuration |
|---|---|
|
Use Scenario: Programmable logic controller maintains calibrated sensor offsets and alarm thresholds across power cycles. IC Role / Device Role / Timing Role: X4323S8-2.7 provides brownout-safe power-on reset, stores calibration data in EEPROM, and guards against firmware lockup via watchdog. Use Value: Prevents execution of stale or corrupted configuration after undervoltage events; retains critical settings without backup battery. |
Use Scenario: Portable infusion pump stores drug delivery profiles and usage logs in nonvolatile memory. IC Role / Device Role / Timing Role: X4323S8-2.7 supervises 3.3V rail, triggers system reset below 2.7V, and secures therapy parameters against unintended writes. Use Value: Meets IEC 62304 safety requirements for data integrity; hardware WP lock ensures FDA-cleared settings remain immutable. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: BCM retains window position, mirror angle, and lighting preferences after ignition-off. IC Role / Device Role / Timing Role: X4323S8-2.7 monitors 5V supply, asserts reset during cranking-induced dips, and stores user settings in EEPROM. Use Value: Guarantees consistent behavior across cold-start and load-dump transients; 1V reset hold ensures operation down to battery depletion. |
Use Scenario: Meter records tariff schedules, billing cycles, and tamper events over 10+ year lifetime. IC Role / Device Role / Timing Role: X4323S8-2.7 provides accurate 2.7V brownout detection, safeguards metering constants in EEPROM, and detects MCU hang via watchdog. Use Value: Eliminates external supervisor + EEPROM BOM cost; block-lock protection prevents unauthorized tariff modification. |
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 |
|---|---|---|---|
| MAX6361KA27+T | Fixed 2.7V reset threshold only; no VTRIP reprogramming; 16Kbit EEPROM; 100kHz I²C max. | Lacks field-adjustable trip point and faster interface - suitable for cost-sensitive designs where precision threshold tuning is unnecessary. | Choose MAX6361KA27+T if VTRIP stability over temperature is prioritized over programmability and higher-speed EEPROM access. |
| STM8AF5268TCX | Integrated 8-bit MCU core with 64KB Flash, 6KB RAM, and hardware watchdog; no serial EEPROM; reset threshold not adjustable. | Replaces discrete supervisor + EEPROM with embedded firmware-controlled supervision - requires MCU development effort but adds flexibility. | Choose STM8AF5268TCX when system-level customization (e.g., adaptive watchdog, dynamic reset logic) justifies added software complexity. |
Compared with MAX6361KA27+T and STM8AF5268TCX, the X4323S8-2.7 uniquely combines field-programmable VTRIP, 400kHz I²C, and 32Kbit EEPROM in a pin-compatible SOIC-8 footprint - enabling drop-in upgrade paths for legacy designs while supporting tighter voltage-margin applications.
Availability
X4323S8-2.7 is available at Aetrix Electronics and suitable for industrial PLC control, medical device configuration, automotive body control modules, smart energy meters, and embedded telemetry systems requiring stable component supply across extended product lifecycles.
Supply support for X4323S8-2.7 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
Xicor was a fabless semiconductor company specializing in nonvolatile memory and power management ICs, acquired by Intersil in 2001 and later integrated into Renesas Electronics.
The X4323/5 family was designed to consolidate power-on reset, watchdog, voltage monitoring, and EEPROM into a single chip for space-constrained microcontroller-based systems - targeting cost reduction and reliability improvement in industrial and medical equipment.
FAQ
What is the factory-set reset threshold voltage for the X4323S8-2.7?
The X4323S8-2.7 ships with a factory-set VTRIP of 2.7V, matching its suffix designation. This threshold is guaranteed over temperature and supply variations per the datasheet's electrical characteristics table. It can be reprogrammed to other values using the VP pulse method on the WP pin, but the default remains 2.7V unless modified in-system.
Does the X4323S8-2.7 support true I²C Fast-mode operation?
Yes, the X4323S8-2.7 fully supports I²C Fast-mode at 400kHz, including proper START/STOP condition timing, ACK polling, and 64-byte page write capability. Its SDA and SCL pins meet I²C bus electrical specifications for open-drain operation with defined rise/fall times and noise immunity - confirmed in the "Serial Interface Conventions" section of the datasheet.
How does the watchdog timer in the X4323S8-2.7 get reset?
The X4323S8-2.7 watchdog timer is reset by a HIGH-to-LOW transition on the SDA pin while SCL is held HIGH - i.e., a valid I²C START condition. This design allows the host microcontroller to service the watchdog using normal bus activity without dedicating a separate GPIO. If no such transition occurs within the selected timeout period (200ms/600ms/1.4s), RESET/RESET is asserted.
Can the EEPROM in the X4323S8-2.7 be written to while the RESET/RESET output is active?
No. While RESET/RESET is active - whether due to power-up, brownout, or watchdog timeout - all serial communication is inhibited and no nonvolatile write operations may begin. In-progress writes are allowed to complete, but new commands (including EEPROM writes and control register updates) are ignored until RESET/RESET deasserts and stabilizes for 200ms.
What is the function of the S0 and S1 pins on the X4323S8-2.7?
The S0 and S1 pins on the X4323S8-2.7 configure the two most significant bits of the I²C slave address, allowing up to four X4323S8-2.7 devices to share the same I²C bus without address conflict. They are sampled at power-up and remain static during operation - no internal pull-ups/pull-downs, so external termination is required for deterministic addressing.
X4323S8-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4323S8-2.7 FAQ
1.How can I place an order for X4323S8-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4323S8-2.7 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 X4323S8-2.7 reliable?
The price and inventory of X4323S8-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4323S8-2.7 is usually 5 days.
3.What payment methods are accepted for X4323S8-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4323S8-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4323S8-2.7?
X4323S8-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4323S8-2.7 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 X4323S8-2.7?
For technical support, including X4323S8-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4323S8-2.7 requirements.
6.How does Aetrix verify that X4323S8-2.7 is sourced from the original manufacturer or authorized distributors?
All X4323S8-2.7 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 X4323S8-2.7 meets industry standards.
7.What is the process for return or replacement of X4323S8-2.7?
All X4323S8-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4323S8-2.7, 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 X4323S8-2.7 part is unused and in its original packaging.
Return procedure for X4323S8-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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