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

Renesas X4283S8I-2.7A

Name: X4283S8I-2.7A
Brand: Renesas
SKU: X4283S8I-2.7A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X4283S8I-2.7A

Manufacturer:: Renesas

Category:: Supervisors

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

Datasheet:: X4283S8I-2.7A.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SO

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Product details

Overview

X4283S8I-2.7A from Xicor (now part of Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 128 Kbit serial EEPROM with Block Lock™ protection. It operates from 2.7V to 5.5V, features four standard V_CC reset thresholds (adjustable down to 1V), delivers <20 µA standby current with watchdog enabled, and supports 400 kHz 2-wire (I²C-compatible) interface - used in embedded microcontroller systems requiring reliable boot sequencing and nonvolatile parameter storage.

For engineers reviewing the X4283S8I-2.7A datasheet, X4283S8I-2.7A pinout, X4283S8I-2.7A application, or X4283S8I-2.7A equivalent, key selection criteria include its programmable V_TRIP threshold, 200 ms–1.4 s selectable watchdog timeout, 64-byte page write capability, hardware/software write protection via WP pin and BP bits, and dual 8-lead SOIC/TSSOP packaging for space-constrained industrial control and instrumentation designs.

Technical Context

The X4283S8I-2.7A implements a dedicated low-voltage detection circuit with hysteresis that asserts RESET/RESET until V_CC exceeds the trip point for 200 ms; it also guarantees valid reset assertion down to V_CC = 1 V. Its watchdog timer monitors SDA transitions while SCL is HIGH and offers three fixed timeout intervals (200 ms, 600 ms, 1.4 s) controlled by nonvolatile WD1/WD0 bits.

The integrated 128 Kbit EEPROM is organized as 16K × 8, supports byte and 64-byte page writes with self-timed 5 ms typical write cycles, and enforces write protection via three nonvolatile BP2/BP1/BP0 bits plus hardware lock using the WP pin and WPEN bit - enabling selective locking of 64-byte to full-array segments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.7 V to 5.5 V - enables direct interface with 3.3 V and 5 V microcontrollers without level-shifting.
Reset Threshold	Four factory-set options (e.g., 2.63 V, 2.93 V, 3.08 V, 4.65 V); reprogrammable to custom value - allows precise brownout detection matching system rail tolerances.
Watchdog Timeout	Selectable: 200 ms / 600 ms / 1.4 s (WD1/WD0 bits) - provides deterministic fail-safe recovery timing independent of software execution.
EEPROM Capacity	128 Kbit (16K × 8) - stores >2 Kbytes of calibration data, device configuration, or event logs in a single chip.
I²C Interface Speed	Up to 400 kHz - supports fast parameter read/write during runtime without blocking main MCU operation.
Standby Current	<20 µA (watchdog on), <1 µA (watchdog off) - extends battery life in always-on monitoring applications.
Reset Pulse Width	250 ms minimum after power-up or V_CC recovery - ensures stable oscillator startup and FPGA configuration before processor release.

Pinout & Package

Package: 8-lead SOIC (JEDEC MS-012) and 8-lead TSSOP - both RoHS-compliant, surface-mount packages with 1.27 mm pitch; footprint compatible for drop-in replacement between variants.

Pin/Terminal	Circuit Role	Design Meaning
S0	Device Select Input	LSB of 2-bit hardware address; sets I²C slave address along with S1 - enables up to four X4283S8I-2.7A devices on same bus.
S1	Device Select Input	MSB of 2-bit hardware address; combined with S0 defines unique 7-bit I²C address (1010xx0).
RESET/RESET	Active-Low Reset Output	Open-drain output asserted during power-up, brownout, or watchdog timeout - directly drives MCU reset input with external pull-up.
VSS	Ground Reference	Primary digital ground return path; must be connected to system GND plane for noise immunity and reset timing accuracy.
SDA	Serial Data Line	Bidirectional open-drain I²C data line; requires external pull-up; also serves as watchdog trigger input (falling edge while SCL=HIGH resets timer).
SCL	Serial Clock Input	Master-generated clock synchronizing all I²C transfers; rising edge samples SDA, falling edge drives SDA - defines 400 kHz max data rate.
WP	Write Protect Input	Hardware enable for Block Lock protection; when HIGH + WPEN bit set, prevents all EEPROM writes including control register updates.
VCC	Power Supply Input	Primary supply for logic, EEPROM, and reset circuitry; powers internal voltage reference used for V_TRIP detection.

Key Features

Feature	Design Value
Programmable V_TRIP Threshold	Factory-set thresholds (e.g., 2.63 V, 2.93 V) can be reprogrammed to custom voltage using VP on WP pin - eliminates need for external resistor-divider networks.
Block Lock™ Protection	Eight configurable protection modes (none, 64–512 bytes, 4K–16K) controlled by BP2/BP1/BP0 bits - prevents accidental overwrites of critical firmware or calibration data.
Self-Timed EEPROM Writes	5 ms typical write cycle time per byte or page; no external timing control required - simplifies firmware design and guarantees completion before next access.
Power-On Reset Timing	250 ms guaranteed reset assertion after V_CC stabilization - ensures FPGA configuration, oscillator settling, and peripheral initialization complete before MCU release.
Watchdog Independence	Timer restarts only on SDA falling edge while SCL is HIGH (I²C start condition); immune to bus noise or spurious SCL toggling - improves reliability in electrically noisy environments.

Applications

Industrial PLC Controller	Medical Diagnostic Instrument
Use Scenario: Programmable logic controller maintains persistent I/O mapping, alarm thresholds, and runtime counters across power cycles. IC Role / Device Role / Timing Role: X4283S8I-2.7A provides power-on reset coordination, brownout detection at 2.93 V, and secure storage of 16K configuration registers in EEPROM. Use Value: Prevents corrupted state transitions during unstable AC line conditions and retains calibrated sensor offsets without backup battery.	Use Scenario: Portable ultrasound device stores transducer calibration coefficients, user preferences, and last-used imaging presets. IC Role / Device Role / Timing Role: X4283S8I-2.7A supervises 3.3 V supply, triggers hard reset if voltage drops below 2.63 V, and protects calibration data using 512-byte Block Lock. Use Value: Ensures FDA-compliant data integrity and eliminates field failures due to EEPROM corruption during battery swaps or low-power states.
Smart Energy Meter	Automotive Body Control Module
Use Scenario: Revenue-grade meter logs tamper events, billing cycles, and phase imbalance data over 10+ years of operation. IC Role / Device Role / Timing Role: X4283S8I-2.7A monitors 5 V rail for grid sags, initiates watchdog recovery on firmware hang, and stores 128 Kbit of encrypted usage history. Use Value: Meets IEC 62053-21 requirements for data retention and fault resilience without adding discrete supervisors or flash memory.	Use Scenario: BCM stores door lock programming, mirror position memory, and adaptive lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: X4283S8I-2.7A asserts reset during cold-crank voltage dip (<2.7 V), guards against ECU reset loops via 600 ms watchdog, and locks first 256 bytes of EEPROM. Use Value: Eliminates intermittent module resets during engine start and preserves user settings even after deep battery discharge.

Industrial PLC Controller

Medical Diagnostic Instrument

Use Scenario: Programmable logic controller maintains persistent I/O mapping, alarm thresholds, and runtime counters across power cycles.

IC Role / Device Role / Timing Role: X4283S8I-2.7A provides power-on reset coordination, brownout detection at 2.93 V, and secure storage of 16K configuration registers in EEPROM.

Use Value: Prevents corrupted state transitions during unstable AC line conditions and retains calibrated sensor offsets without backup battery.

Use Scenario: Portable ultrasound device stores transducer calibration coefficients, user preferences, and last-used imaging presets.

IC Role / Device Role / Timing Role: X4283S8I-2.7A supervises 3.3 V supply, triggers hard reset if voltage drops below 2.63 V, and protects calibration data using 512-byte Block Lock.

Use Value: Ensures FDA-compliant data integrity and eliminates field failures due to EEPROM corruption during battery swaps or low-power states.

Smart Energy Meter

Automotive Body Control Module

Use Scenario: Revenue-grade meter logs tamper events, billing cycles, and phase imbalance data over 10+ years of operation.

IC Role / Device Role / Timing Role: X4283S8I-2.7A monitors 5 V rail for grid sags, initiates watchdog recovery on firmware hang, and stores 128 Kbit of encrypted usage history.

Use Value: Meets IEC 62053-21 requirements for data retention and fault resilience without adding discrete supervisors or flash memory.

Use Scenario: BCM stores door lock programming, mirror position memory, and adaptive lighting profiles across ignition cycles.

IC Role / Device Role / Timing Role: X4283S8I-2.7A asserts reset during cold-crank voltage dip (<2.7 V), guards against ECU reset loops via 600 ms watchdog, and locks first 256 bytes of EEPROM.

Use Value: Eliminates intermittent module resets during engine start and preserves user settings even after deep battery discharge.

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 V_TRIP reprogramming; 64 Kbit EEPROM; 100 kHz I²C only	Lacks adjustable brownout detection and high-speed interface - suitable only for cost-sensitive, static-threshold designs	Choose when V_TRIP tuning is unnecessary and 400 kHz bandwidth is not required.
STM8T142M2U6	Dedicated 3.3 V supervisor with 16 Kbit EEPROM; integrated RC oscillator; no watchdog timer	Missing watchdog functionality and multi-threshold support - requires external timer for fail-safe recovery	Prefer when system already includes independent watchdog and only basic reset + small EEPROM is needed.

Compared with MAX6361KA29+T and STM8T142M2U6, the X4283S8I-2.7A uniquely combines field-adjustable V_TRIP, 400 kHz I²C, full watchdog configurability, and 128 Kbit protected EEPROM - making it optimal for systems demanding precision supervision, high-speed parameter updates, and long-term data integrity without added components.

Availability

X4283S8I-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, automotive body control modules, and portable test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for X4283S8I-2.7A 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 Renesas Electronics in 2008. Its legacy products emphasize high-reliability, low-power, and system-integration advantages.

The X4283/85 product line was designed to replace discrete reset ICs, watchdog timers, and serial EEPROMs in microcontroller-based systems - targeting space-constrained, mission-critical applications where board area, BOM count, and data integrity are primary constraints.

FAQ

What is the function of the WP pin on the X4283S8I-2.7A?

The WP (Write Protect) pin on the X4283S8I-2.7A enables hardware-level EEPROM write inhibition when driven HIGH and the WPEN bit is set in the control register. This prevents all nonvolatile writes - including to the control register itself - ensuring critical calibration data or firmware parameters cannot be overwritten during unexpected MCU behavior or firmware bugs. The X4283S8I-2.7A remains fully readable and functional under WP activation.

Can the reset threshold voltage of the X4283S8I-2.7A be customized?

Yes, the X4283S8I-2.7A supports in-system V_TRIP reprogramming using a 12–15 V pulse applied to the WP pin while holding V_CC at the desired threshold voltage. This procedure modifies the internal reference and is nonvolatile - allowing precise alignment with system-specific brownout requirements without external components. The X4283S8I-2.7A ships with four standard thresholds but retains full programmability throughout its lifetime.

How does the watchdog timer on the X4283S8I-2.7A differ from standard I²C bus activity monitoring?

The X4283S8I-2.7A watchdog timer responds exclusively to a falling edge on SDA while SCL is HIGH - matching the I²C start condition - rather than general bus traffic. This design prevents false timeouts caused by ACK/NACK pulses or clock stretching. The X4283S8I-2.7A ignores SCL-only toggles or SDA changes during SCL LOW, ensuring robust supervision even under heavy I²C load or protocol anomalies.

What EEPROM protection modes are supported by the X4283S8I-2.7A?

The X4283S8I-2.7A implements eight Block Lock™ protection modes via BP2/BP1/BP0 bits: none, 64/128/256/512 bytes, upper quarter (4K), upper half (8K), or full array (16K). Protection is enforced at the hardware level and persists through power cycles. The X4283S8I-2.7A also supports software write-enable (WEL/RWEL) and hardware lock (WP + WPEN), enabling layered security for different data classes.

Is the X4283S8I-2.7A pin-compatible with other members of the X4283/85 family?

Yes, the X4283S8I-2.7A shares identical pinout, package dimensions, and electrical interface with all X4283/85 variants (e.g., X4283S8I-3.0A, X4285S8I-2.7A), differing only in factory-programmed V_TRIP threshold and reset polarity (X4283 = active-low RESET, X4285 = active-high RST). The X4283S8I-2.7A may be substituted within the same package type without PCB modification, provided the reset signal polarity and threshold match system requirements.

X4283S8I-2.7A 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:: 2.92V

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

X4283S8I-2.7A FAQ

1.How can I place an order for X4283S8I-2.7A through Aetrix?

Please submit a Request for Quotation (RFQ) for X4283S8I-2.7A 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 X4283S8I-2.7A reliable?

The price and inventory of X4283S8I-2.7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4283S8I-2.7A is usually 5 days.

3.What payment methods are accepted for X4283S8I-2.7A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4283S8I-2.7A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X4283S8I-2.7A?

X4283S8I-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X4283S8I-2.7A 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 X4283S8I-2.7A?

For technical support, including X4283S8I-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4283S8I-2.7A requirements.

6.How does Aetrix verify that X4283S8I-2.7A is sourced from the original manufacturer or authorized distributors?

All X4283S8I-2.7A 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 X4283S8I-2.7A meets industry standards.

7.What is the process for return or replacement of X4283S8I-2.7A?

All X4283S8I-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4283S8I-2.7A, 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 X4283S8I-2.7A part is unused and in its original packaging.

Return procedure for X4283S8I-2.7A:

1.Submit a request within 90 days.

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

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