Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Renesas X4323S8

Name: X4323S8
Brand: Renesas
SKU: X4323S8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: X4323S8

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: X4323S8.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:490

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

X4323S8 from Xicor (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 32Kbit serial EEPROM in a single 8-lead SOIC package. It features four selectable V_CC reset thresholds (2.63V/2.93V/3.08V/4.38V), 400kHz I²C-compatible 2-wire interface, and <20µA standby current with watchdog enabled - used in embedded microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X4323S8 datasheet, X4323S8 pinout, X4323S8 application, or X4323S8 equivalent, key selection criteria include programmable V_TRIP threshold adjustment, block-lock EEPROM protection (1–8 pages or full array), watchdog timeout options (200ms/600ms/1.4s), and operation across 2.7V–5.5V supply range with RESET valid down to V_CC = 1V.

Technical Context

The X4323S8 implements a dual-function reset architecture: power-on reset asserts RESET for 250ms after V_CC stabilization, while low-V_CC detection holds RESET active until V_CC exceeds the selected V_TRIP threshold for 200ms. Its watchdog timer monitors SDA transitions during SCL HIGH and triggers RESET if no start-bit event occurs within the selected timeout interval.

EEPROM functionality uses 64-byte page write mode with self-timed 5ms typical write cycle, supported by hardware write protection via WP pin and nonvolatile WPEN bit, plus software-controlled Block Protect bits (BP2–BP0) enabling selective lock of memory segments from 64 bytes to full 4KB array.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V to 5.5V - supports wide-input industrial and automotive microcontroller rails without external regulation.
Reset Threshold Options	2.63V / 2.93V / 3.08V / 4.38V - factory-programmed standard trip points, reprogrammable to custom values via VP-assisted sequence.
Watchdog Timeout	200ms / 600ms / 1.4s / disabled - set via nonvolatile WD1/WD0 bits; persists across power cycles unless rewritten.
EEPROM Capacity	32Kbit (4K × 8) - organized as 64-byte pages; enables robust storage of calibration data, device IDs, or firmware parameters.
I²C Interface Speed	400kHz max - compatible with standard Fast-mode I²C controllers; supports byte and page write with ACK polling.
Standby Current	<20µA (watchdog on) / <1µA (watchdog off) - enables battery-backed operation in low-power monitoring applications.
RESET Validity	Active down to V_CC = 1V - ensures deterministic reset assertion during deep brownout conditions.

Pinout & Package

Package: 8-lead JEDEC SOIC (3.9mm × 4.9mm, 1.27mm pitch). Pinout validated per Xicor X4323/5 Rev 1.20 datasheet, Figure "PIN CONFIGURATION" (SOIC layout).

Pin	Circuit Role	Design Meaning
S0	Device Select Input	LSB of 2-bit hardware address; sets I²C slave address along with S1 (0x50–0x53 range).
S1	Device Select Input	MSB of 2-bit hardware address; enables up to four X4323S8 devices on same I²C bus.
RESET/RESET	Reset Output	Open-drain active-low output; asserted during power-up, brownout, or watchdog timeout; remains active ≥250ms after V_CC recovery.
VSS	Ground	Reference return path for all internal circuits and I²C interface; must be low-impedance connection.
SDA	Serial Data	Bidirectional open-drain I²C data line; also serves as watchdog trigger input (HIGH→LOW transition while SCL=HIGH resets timer).
SCL	Serial Clock	Input-only I²C clock line; controls timing for all read/write operations and watchdog sampling window.
WP	Write Protect	Hardware enable for Block Lock protection; when HIGH + WPEN=1, prevents writes to protected EEPROM blocks and Control Register.
VCC	Supply Voltage	Primary power input (2.7–5.5V); also used as reference for V_TRIP programming during threshold adjustment.

Key Features

Feature	Design Value
Programmable V_TRIP Threshold	Factory-set standard voltages can be reprogrammed to custom levels (e.g., 3.3V ±10mV) using VP=12–15V on WP pin and controlled V_CC - eliminates need for external voltage supervisors in precision applications.
Nonvolatile Watchdog Configuration	WD1/WD0 bits stored in EEPROM retain timeout setting across power cycles - avoids runtime initialization overhead and ensures consistent fail-safe behavior.
Granular EEPROM Block Lock	BP2–BP0 bits enable locking of 64-byte to 4KB memory segments - allows secure storage of bootloader code in protected region while permitting field-updatable parameter storage in unlocked pages.
Power-Fail Immunity	RESET remains asserted until V_CC ≥ V_TRIP + 200ms and stays valid down to 1V - prevents processor execution during unstable supply ramp-down or capacitor discharge.
Three-Step Control Register Write	WEL → RWEL → data sequence prevents accidental modification of watchdog or block-lock settings - critical for certified safety-critical firmware deployments.

Applications

Industrial PLC Controller	Medical Infusion Pump
Use Scenario: Microcontroller-based PLC unit requires deterministic boot, brownout recovery, and persistent storage of I/O calibration tables. IC Role / Device Role / Timing Role: X4323S8 provides power-on reset hold-off, real-time V_CC monitoring, and 32Kbit EEPROM for sensor offset compensation data. Use Value: Eliminates separate reset IC and serial EEPROM, reducing BOM count by two components while guaranteeing coordinated reset timing and data integrity during mains interruption.	Use Scenario: Battery-powered infusion pump stores drug delivery logs and motor calibration constants across frequent power cycles. IC Role / Device Role / Timing Role: X4323S8 acts as system supervisor and nonvolatile memory - its <1µA watchdog-off standby current extends battery life, and programmable V_TRIP ensures safe shutdown at 2.85V. Use Value: Enables single-chip solution for safety-critical data retention and fail-safe reset, meeting IEC 62304 Class C software requirements without external supervision circuitry.
Automotive Body Control Module	Smart Energy Meter
Use Scenario: BCM stores door lock actuator profiles and fault history in harsh 12V battery environment with wide temperature and voltage transients. IC Role / Device Role / Timing Role: X4323S8 delivers cold-crank tolerant reset (V_CC = 1V operation), watchdog supervision of MCU firmware, and EEPROM with hardware write protection against ESD-induced corruption. Use Value: Withstands ISO 7637-2 pulse 4 (load dump) and pulse 5a (cold crank) events while preserving critical configuration data - reduces need for redundant storage schemes.	Use Scenario: Revenue-grade meter retains tariff schedules, billing registers, and tamper logs over 15+ year service life with infrequent battery replacement. IC Role / Device Role / Timing Role: X4323S8 serves as long-term configuration manager - its 32Kbit EEPROM supports 1M write cycles per page, and block-lock prevents overwrite of revenue-critical registers. Use Value: Meets ANSI C12.20 accuracy requirements by ensuring EEPROM data integrity under extended temperature cycling (-40°C to +85°C) and eliminating risk of inadvertent register erasure during firmware updates.

Industrial PLC Controller

Medical Infusion Pump

Use Scenario: Microcontroller-based PLC unit requires deterministic boot, brownout recovery, and persistent storage of I/O calibration tables.

IC Role / Device Role / Timing Role: X4323S8 provides power-on reset hold-off, real-time V_CC monitoring, and 32Kbit EEPROM for sensor offset compensation data.

Use Value: Eliminates separate reset IC and serial EEPROM, reducing BOM count by two components while guaranteeing coordinated reset timing and data integrity during mains interruption.

Use Scenario: Battery-powered infusion pump stores drug delivery logs and motor calibration constants across frequent power cycles.

IC Role / Device Role / Timing Role: X4323S8 acts as system supervisor and nonvolatile memory - its <1µA watchdog-off standby current extends battery life, and programmable V_TRIP ensures safe shutdown at 2.85V.

Use Value: Enables single-chip solution for safety-critical data retention and fail-safe reset, meeting IEC 62304 Class C software requirements without external supervision circuitry.

Automotive Body Control Module

Smart Energy Meter

Use Scenario: BCM stores door lock actuator profiles and fault history in harsh 12V battery environment with wide temperature and voltage transients.

IC Role / Device Role / Timing Role: X4323S8 delivers cold-crank tolerant reset (V_CC = 1V operation), watchdog supervision of MCU firmware, and EEPROM with hardware write protection against ESD-induced corruption.

Use Value: Withstands ISO 7637-2 pulse 4 (load dump) and pulse 5a (cold crank) events while preserving critical configuration data - reduces need for redundant storage schemes.

Use Scenario: Revenue-grade meter retains tariff schedules, billing registers, and tamper logs over 15+ year service life with infrequent battery replacement.

IC Role / Device Role / Timing Role: X4323S8 serves as long-term configuration manager - its 32Kbit EEPROM supports 1M write cycles per page, and block-lock prevents overwrite of revenue-critical registers.

Use Value: Meets ANSI C12.20 accuracy requirements by ensuring EEPROM data integrity under extended temperature cycling (-40°C to +85°C) and eliminating risk of inadvertent register erasure during firmware updates.

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	256-byte EEPROM only; fixed 2.93V reset threshold; no programmable V_TRIP or watchdog timeout selection.	Limited to simple reset + minimal config storage; unsuitable for applications needing >1KB nonvolatile data or custom brownout thresholds.	Select when cost sensitivity outweighs EEPROM capacity and configurability needs.
STM8T142M2U6	Dedicated 32Kbit EEPROM absent; integrates advanced watchdog with windowed mode and independent clock source; reset threshold fixed at 2.85V.	Requires external EEPROM for parameter storage; better suited for high-integrity watchdog monitoring than combined supervision/storage tasks.	Prefer when watchdog reliability is primary concern and EEPROM is available elsewhere in design.

Compared with MAX6361KA29+T and STM8T142M2U6, the X4323S8 uniquely combines field-programmable V_TRIP, multi-option watchdog, and 32Kbit EEPROM in one SOIC-8 package - delivering higher integration density and design flexibility for space-constrained embedded systems requiring both supervision and substantial nonvolatile storage.

Availability

X4323S8 is available at Aetrix Electronics and suitable for industrial automation, medical device, automotive body electronics, and smart metering applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for X4323S8 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 Inc. was a fabless semiconductor company specializing in nonvolatile memory and power management ICs, acquired by Renesas Electronics in 2008. Known for innovation in EEPROM-integrated supervisors and programmable voltage references.

The X4323/5 product line was designed to consolidate power-on reset, brownout detection, watchdog supervision, and serial EEPROM into a single chip - targeting cost-sensitive, space-constrained embedded systems where reliability and data integrity are critical.

FAQ

What is the default watchdog timeout setting for the X4323S8?

The X4323S8 ships with watchdog disabled (WD1=1, WD0=1) as the factory default. This state persists across power cycles until explicitly reconfigured via the Control Register. To enable watchdog functionality, users must execute the three-step write sequence to set WD1/WD0 to 00 (1.4s), 01 (600ms), or 10 (200ms), with WP pin LOW during programming. The X4323S8 watchdog monitors SDA transitions only when enabled and will assert RESET if no valid start condition occurs within the selected interval.

Can the X4323S8 V_TRIP threshold be adjusted in-circuit without removing the device?

Yes, the X4323S8 supports in-system V_TRIP reprogramming using its dedicated VP-assisted sequence. By applying 12–15V to the WP pin while holding V_CC at the desired threshold voltage and issuing the correct I²C command sequence (A0h → 00h → 01h → 00h), the trip point can be updated without device removal. This capability allows field calibration for aging power supplies or board-level voltage tolerances. The X4323S8 datasheet specifies that the new V_TRIP becomes effective after the programming cycle completes and V_CC stabilizes.

How does the X4323S8 handle EEPROM write operations during a brownout event?

The X4323S8 halts all EEPROM write activity when RESET/RESET is asserted - which occurs whenever V_CC falls below the programmed V_TRIP threshold. Any write in progress is allowed to complete before RESET activation, but no new writes are accepted while RESET is active. This ensures data integrity by preventing partial writes or corrupted page programming during supply collapse. The X4323S8's ability to maintain RESET assertion down to V_CC = 1V guarantees this protection even during deep brownouts.

What is the maximum number of write cycles supported by the X4323S8 EEPROM array?

The X4323S8 EEPROM array is rated for 1,000,000 write cycles per page (64-byte block), not per byte. This endurance applies to each individual page address - meaning repeated writes to addresses 0x0000–0x003F constitute one page's cycle count. Wear leveling must be implemented in firmware to distribute writes across multiple pages. The X4323S8's page-write mode and block-lock protection facilitate such strategies by enabling atomic 64-byte updates and preventing accidental overwrites of critical regions.

Is the X4323S8 pin-compatible with other members of the X4323/5 family, such as X4325S8?

No, the X4323S8 is not pin-compatible with the X4325S8. While both share identical SOIC-8 packaging and core functionality, the X4325S8 features an active-high RESET output (labeled RESET), whereas the X4323S8 provides active-low RESET/RESET. This difference appears on Pin 3 (SOIC) and affects external pull-up/pull-down requirements and logic interpretation in the host system. The X4323S8 datasheet explicitly distinguishes these variants in the PIN FUNCTION table and BLOCK DIAGRAM, confirming distinct reset polarity as a key differentiator.

X4323S8 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:: 4.38V

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 FAQ

1.How can I place an order for X4323S8 through Aetrix?

Please submit a Request for Quotation (RFQ) for X4323S8 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 reliable?

The price and inventory of X4323S8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4323S8 is usually 5 days.

3.What payment methods are accepted for X4323S8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4323S8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X4323S8?

X4323S8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X4323S8 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?

For technical support, including X4323S8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4323S8 requirements.

6.How does Aetrix verify that X4323S8 is sourced from the original manufacturer or authorized distributors?

All X4323S8 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 meets industry standards.

7.What is the process for return or replacement of X4323S8?

All X4323S8 units undergo pre-shipment inspection (PSI). If there is an issue with X4323S8, 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 part is unused and in its original packaging.

Return procedure for X4323S8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…