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

Renesas X4283S8-4.5A

Name: X4283S8-4.5A
Brand: Renesas
SKU: X4283S8-4.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X4283S8-4.5A

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X4283S8-4.5A.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

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Product details

Overview

X4283S8-4.5A from Xicor (now part of Renesas) is a CPU supervisor IC integrating power-on reset control, selectable watchdog timer, low-V_CC detection, and 128 Kbit (16K × 8) serial EEPROM with Block Lock™ protection. It operates from 2.7V to 5.5V, asserts RESET/RESET down to V_CC = 1V, and supports 400 kHz 2-wire interface - used in embedded microcontroller systems requiring reliable boot supervision and nonvolatile parameter storage.

For engineers reviewing the X4283S8-4.5A datasheet, X4283S8-4.5A pinout, X4283S8-4.5A application, or X4283S8-4.5A equivalent, key selection criteria include its programmable V_TRIP threshold (factory-set to 4.5V), 200 ms reset timeout, 64-byte page write capability, and hardware/software write protection via WP pin and BP bits - critical for industrial control and automotive body electronics where brownout resilience and EEPROM integrity are mandatory.

Technical Context

The X4283S8-4.5A implements a dual-function reset architecture: power-on reset (t_PURST = 250 ms nominal) and low-V_CC monitoring with factory-trimmed 4.5V trip point (V_TRIP), reprogrammable via VP-assisted sequence. Its watchdog timer uses SDA edge detection (HIGH→LOW while SCL=HIGH) and offers three timeout options: 200 ms, 600 ms, or 1.4 s - selected by nonvolatile WD1/WD0 bits.

EEPROM operation follows standard I²C protocol at up to 400 kHz, with self-timed 5 ms typical write cycle, 64-byte page write mode, and multi-level protection: Power-up/down lock, volatile WEL/RWEL latches, nonvolatile BP2–BP0 block lock (protecting 64B to full 16KB), and hardware write protect enabled when WP=HIGH and WPEN=1.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP Threshold	4.5 V ±100 mV - factory-programmed reset voltage; ensures system reset before MCU enters unstable operating region during brownout.
Reset Timeout	250 ms after V_CC ≥ V_TRIP - guarantees sufficient stabilization time for oscillator and FPGA configuration prior to release.
Watchdog Timeout Options	200 ms / 600 ms / 1.4 s - selectable via nonvolatile WD1/WD0 bits; enables precise fail-safe timing for diverse firmware execution profiles.
EEPROM Capacity & Organization	128 Kbit (16K × 8), organized in 64-byte pages - supports efficient parameter logging and calibration storage without external memory.
Interface Speed	400 kHz 2-wire (I²C-compatible) - enables fast configuration reads/writes without burdening low-speed microcontroller buses.
Standby Current	<20 µA with watchdog enabled - minimizes battery drain in always-on supervisory applications such as smart sensors.
Supply Range	2.7 V to 5.5 V - interoperable with 3.3 V and 5 V logic domains, eliminating level-shifting requirements.

Pinout & Package

Package: 8-lead SOIC (JEDEC MS-012), 150 mil width. Pinout validated per Xicor X4283/85 Rev 1.21 datasheet, Figure "PIN CONFIGURATION" and "PIN DESCRIPTION".

Pin/Terminal	Circuit Role	Design Meaning
S0	Device Select Input	LSB of 2-bit device address (A0 = S1, A1 = S0); enables up to four X4283S8-4.5A devices on same I²C bus.
S1	Device Select Input	MSB of 2-bit device address; combined with S0, forms slave address bits for I²C arbitration.
RESET/RESET	Active-Low Reset Output	Open-drain output asserted during power-up, brownout (V_CC < 4.5 V), or watchdog timeout; remains active ≥250 ms after recovery.
V_SS	Ground Reference	Primary return path for all internal circuits; must be connected to system ground plane for noise immunity.
SDA	Serial Data I/O	Bidirectional open-drain I²C data line; requires external pull-up; also serves as watchdog trigger input (edge-sensitive).
SCL	Serial Clock Input	Master-generated clock synchronizing all I²C transfers; must remain HIGH during SDA transitions for valid watchdog restart.
WP	Write Protect Control	Hardware enable for Block Lock protection; when HIGH + WPEN=1, prevents all EEPROM writes including control register updates.
V_CC	Power Supply Input	Primary supply (2.7–5.5 V); powers reset logic, watchdog, EEPROM, and I²C interface; also used as reference for V_TRIP programming.

Key Features

Feature	Design Value
Programmable V_TRIP	Factory-set to 4.5 V but reconfigurable via VP-assisted sequence - allows field tuning for board-specific supply tolerances or custom brownout margins.
Block Lock™ Protection	Eight configurable protection zones (64B to full 16KB) controlled by nonvolatile BP2–BP0 bits - prevents accidental overwrites of critical calibration or security keys.
Watchdog Timer with Edge Detection	Monitors SDA transitions (not bus activity), eliminating false triggers from idle I²C traffic - ensures only intentional firmware heartbeat resets watchdog.
Power-Up/Down Write Inhibit	Automatic EEPROM write blocking during V_CC ramp-up/ramp-down - eliminates risk of corrupted data during power sequencing.
Self-Timed EEPROM Writes	5 ms typical internal write cycle with acknowledge polling support - enables deterministic firmware timing without fixed delays or busy-wait loops.

Applications

Industrial PLC I/O Module	Automotive Body Control Unit (BCU)
Use Scenario: PLC module stores sensor calibration coefficients, fault logs, and configuration parameters across power cycles. IC Role / Device Role / Timing Role: X4283S8-4.5A provides power-on reset coordination, brownout detection at 4.5 V, and tamper-resistant EEPROM storage with hardware write lock. Use Value: Prevents invalid calibration loading during undervoltage conditions and ensures EEPROM writes complete only during stable 5 V supply - critical for SIL-2 functional safety compliance.	Use Scenario: BCU retains door lock settings, mirror position memory, and lighting profiles while vehicle battery voltage fluctuates during start-stop cycles. IC Role / Device Role / Timing Role: X4283S8-4.5A monitors 12 V rail (via 5 V LDO), asserts reset if voltage drops below 4.5 V, and safeguards EEPROM against spurious writes during cranking transients. Use Value: Enables reliable nonvolatile storage even during engine cranking (V_BAT dips to ~6–7 V → 5 V LDO output may sag to 4.4 V), avoiding loss of user preferences.
Medical Infusion Pump Controller	Smart Energy Meter Firmware Bootloader
Use Scenario: Infusion pump stores drug delivery history, alarm thresholds, and operator access codes in EEPROM; requires guaranteed reset on power anomaly. IC Role / Device Role / Timing Role: X4283S8-4.5A delivers 250 ms power-on reset hold-off, 4.5 V brownout reset, and watchdog supervision of main MCU - preventing unsafe motor activation during boot. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic reset behavior and protected EEPROM storage of audit trails.	Use Scenario: Energy meter bootloader validates firmware signature before update; stores version metadata and rollback counters in EEPROM. IC Role / Device Role / Timing Role: X4283S8-4.5A provides secure, write-protected EEPROM storage (via WP+WPEN) and watchdog supervision of bootloader execution to prevent bricking. Use Value: Hardware-enforced write protection prevents malicious or erroneous overwrites of bootloader critical data - essential for DLMS/COSEM-certified meters.

Industrial PLC I/O Module

Automotive Body Control Unit (BCU)

Use Scenario: PLC module stores sensor calibration coefficients, fault logs, and configuration parameters across power cycles.

IC Role / Device Role / Timing Role: X4283S8-4.5A provides power-on reset coordination, brownout detection at 4.5 V, and tamper-resistant EEPROM storage with hardware write lock.

Use Value: Prevents invalid calibration loading during undervoltage conditions and ensures EEPROM writes complete only during stable 5 V supply - critical for SIL-2 functional safety compliance.

Use Scenario: BCU retains door lock settings, mirror position memory, and lighting profiles while vehicle battery voltage fluctuates during start-stop cycles.

IC Role / Device Role / Timing Role: X4283S8-4.5A monitors 12 V rail (via 5 V LDO), asserts reset if voltage drops below 4.5 V, and safeguards EEPROM against spurious writes during cranking transients.

Use Value: Enables reliable nonvolatile storage even during engine cranking (V_BAT dips to ~6–7 V → 5 V LDO output may sag to 4.4 V), avoiding loss of user preferences.

Medical Infusion Pump Controller

Smart Energy Meter Firmware Bootloader

Use Scenario: Infusion pump stores drug delivery history, alarm thresholds, and operator access codes in EEPROM; requires guaranteed reset on power anomaly.

IC Role / Device Role / Timing Role: X4283S8-4.5A delivers 250 ms power-on reset hold-off, 4.5 V brownout reset, and watchdog supervision of main MCU - preventing unsafe motor activation during boot.

Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic reset behavior and protected EEPROM storage of audit trails.

Use Scenario: Energy meter bootloader validates firmware signature before update; stores version metadata and rollback counters in EEPROM.

IC Role / Device Role / Timing Role: X4283S8-4.5A provides secure, write-protected EEPROM storage (via WP+WPEN) and watchdog supervision of bootloader execution to prevent bricking.

Use Value: Hardware-enforced write protection prevents malicious or erroneous overwrites of bootloader critical data - essential for DLMS/COSEM-certified meters.

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 2.93 V reset threshold; no programmable V_TRIP; 64 Kbit EEPROM; no watchdog timer.	Limited to low-voltage systems (3.3 V domain); unsuitable where brownout detection at 4.5 V or watchdog supervision is required.	Select only if 2.93 V reset and absence of watchdog are acceptable; verify EEPROM size suffices for application data.
STM8AF6266TCY	MCU-based solution (8-bit STM8 core); integrates 128 Kbit EEPROM, reset generator, and watchdog; requires firmware development.	Demands software validation, increases BOM count, and adds qualification overhead vs. single-chip supervisor.	Choose only when programmable logic, analog monitoring, or custom reset sequencing beyond X4283S8-4.5A capabilities is needed.

Compared with MAX6361KA29+T and STM8AF6266TCY, the X4283S8-4.5A uniquely combines factory-trimmed 4.5 V reset, reprogrammable V_TRIP, three-tier watchdog timeout, and hardware-block-locked EEPROM in a zero-firmware, drop-in supervisor IC - reducing design risk and certification effort for safety-critical embedded systems.

Availability

X4283S8-4.5A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical infusion pump controllers, smart energy meter bootloaders, and telecom power management systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for X4283S8-4.5A 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

Xicor Inc., acquired by Renesas Electronics in 2008, specialized in nonvolatile memory and power management ICs with emphasis on reliability, low-power design, and system-level integration.

The X4283/85 product line was engineered to consolidate reset supervision, watchdog protection, and EEPROM storage into a single chip - targeting cost-sensitive, space-constrained embedded systems where firmware robustness and data integrity are non-negotiable.

FAQ

What is the factory-programmed V_TRIP threshold for the X4283S8-4.5A?

The X4283S8-4.5A is shipped with a factory-programmed V_TRIP threshold of 4.5 V ±100 mV. This value is laser-trimmed and remains stable over temperature and time. It can be reprogrammed using the VP-assisted sequence described in the datasheet, but the default setting is precisely 4.5 V - matching the "4.5A" suffix in the part number.

Does the X4283S8-4.5A support I²C standard-mode or fast-mode communication?

The X4283S8-4.5A supports standard-mode I²C operation up to 400 kHz, fully compliant with Philips I²C specification. It does not support fast-mode (1 MHz) or high-speed mode. All timing parameters - including setup/hold times for SDA and SCL - are specified for 400 kHz operation in the datasheet, and the device's internal logic is optimized for this speed range.

How does the watchdog timer in the X4283S8-4.5A get reset, and what are the timeout options?

The X4283S8-4.5A watchdog timer is reset by a HIGH-to-LOW transition on SDA while SCL is held HIGH - matching the I²C START condition. Timeout options are fixed at 200 ms, 600 ms, or 1.4 s, selected by nonvolatile WD1/WD0 bits in the control register. The watchdog remains disabled by default (WD1=WD0=1) until explicitly configured via the control register write sequence.

Can the EEPROM in the X4283S8-4.5A be written to while the RESET/RESET pin is active?

No. While RESET/RESET is active - whether due to power-up, brownout, or watchdog timeout - all EEPROM write operations are blocked. The device terminates any in-progress write and rejects new write commands. This hardware-enforced inhibition ensures EEPROM integrity during unstable supply conditions, and is independent of software-controlled write-enable latches (WEL/RWEL).

What package types are available for the X4283S8-4.5A, and is the pinout identical between them?

The X4283S8-4.5A is offered in 8-lead SOIC (JEDEC MS-012) and 8-lead TSSOP packages. Both share identical pin numbering and function mapping per the datasheet's "PIN CONFIGURATION" diagrams. The SOIC variant uses standard 150-mil body width; the TSSOP is a leaded, space-saving alternative with same electrical characteristics and thermal performance.

X4283S8-4.5A 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:: 4.62V

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

X4283S8-4.5A FAQ

1.How can I place an order for X4283S8-4.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for X4283S8-4.5A 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 X4283S8-4.5A reliable?

The price and inventory of X4283S8-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4283S8-4.5A is usually 5 days.

3.What payment methods are accepted for X4283S8-4.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4283S8-4.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X4283S8-4.5A?

X4283S8-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X4283S8-4.5A 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 X4283S8-4.5A?

For technical support, including X4283S8-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4283S8-4.5A requirements.

6.How does Aetrix verify that X4283S8-4.5A is sourced from the original manufacturer or authorized distributors?

All X4283S8-4.5A 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 X4283S8-4.5A meets industry standards.

7.What is the process for return or replacement of X4283S8-4.5A?

All X4283S8-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X4283S8-4.5A, 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 X4283S8-4.5A part is unused and in its original packaging.

Return procedure for X4283S8-4.5A:

1.Submit a request within 90 days.

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

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