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Renesas X4283S8-2.7A
- Part No.:
- X4283S8-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4283S8-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,419
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Product details
Overview
X4283S8-2.7A from Xicor (now Renesas) is a CPU supervisor IC integrating power-on reset control, selectable watchdog timer, supply voltage supervision, and 128 Kbit serial EEPROM with Block Lock™ protection. It operates from 2.7V to 5.5V, asserts reset down to VCC = 1V, delivers <20 µA standby current (watchdog on), and supports 400 kHz 2-wire interface - used in embedded microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.
For engineers reviewing the X4283S8-2.7A datasheet, X4283S8-2.7A pinout, X4283S8-2.7A application, or X4283S8-2.7A equivalent, key selection criteria include its programmable VTRIP threshold (adjustable via VP programming), 64-byte page write capability, three watchdog timeout options (200 ms / 600 ms / 1.4 s), hardware/software write protection scheme, and dual 8-pin SOIC/TSSOP package compatibility.
Technical Context
The X4283S8-2.7A implements a dedicated low-voltage detection circuit with four factory-standard reset thresholds (2.63V, 2.93V, 3.08V, 4.65V) and user-programmable VTRIP via high-voltage pulse (12–15V) applied to WP while holding VCC at target trip voltage. Its watchdog timer monitors SDA transitions during SCL HIGH and triggers RESET/RESET if no start-bit event occurs within the selected timeout period.
Internally, it combines a CMOS power-on reset generator (250 ms reset pulse), independent watchdog timebase, and 128 Kbit EEPROM organized as 16K × 8 bits with 64-byte pages. The device uses a standard I²C-compatible 2-wire interface (SDA/SCL), supports byte and page writes, and enforces write protection via volatile WEL/RWEL latches and nonvolatile BP2–BP0 block lock bits plus hardware WP/WPEN control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into 3.3V and 5V microcontroller systems without level-shifting. |
| Reset Valid Down To | VCC = 1V - ensures deterministic reset assertion during deep brownout or battery sag conditions. |
| Standby Current (WD on) | <20 µA max - minimizes quiescent power in always-on supervisory functions. |
| EEPROM Capacity | 128 Kbits (16K × 8) - stores full firmware configuration, calibration data, or event logs in compact footprint. |
| I²C Interface Speed | 400 kHz - supports fast parameter updates without slowing system boot or runtime communication. |
| Watchdog Timeout Options | 200 ms / 600 ms / 1.4 s - provides precise fail-safe timing granularity for diverse MCU execution profiles. |
| Page Write Size | 64 bytes - reduces write overhead and improves EEPROM endurance versus byte-write-only devices. |
Pinout & Package
Package: 8-lead SOIC (JEDEC MS-012) and 8-lead TSSOP - both RoHS-compliant, surface-mount packages with 1.27 mm lead pitch and identical pin mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S0 | Device Select Input | LSB of 2-bit hardware address; sets slave address along with S1 for multi-device I²C bus sharing. |
| S1 | Device Select Input | MSB of 2-bit hardware address; enables up to four X4283S8-2.7A devices on same I²C bus. |
| RESET/RESET | Active-Low Reset Output | Open-drain output asserted during power-up, brownout, or watchdog timeout; requires external pull-up. |
| VSS | Ground Reference | System ground return path for all internal circuits and I/O buffers. |
| SDA | Serial Data Line | Bidirectional open-drain I²C data line; also serves as watchdog trigger input (start-bit detection). |
| SCL | Serial Clock Input | Master-generated clock synchronizing all I²C read/write transfers and watchdog sampling window. |
| WP | Write Protect Input | Hardware enable for Block Lock protection; when HIGH + WPEN bit set, prevents all EEPROM writes. |
| VCC | Power Supply Input | Primary supply for logic, EEPROM, and reset circuitry; also used as reference for VTRIP programming. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP Threshold | Allows field-adjustment of reset voltage using 12–15V pulse on WP pin - eliminates need for external resistor dividers or custom BOMs. |
| Three-Option Watchdog Timer | Nonvolatile WD1/WD0 bits select 200 ms / 600 ms / 1.4 s timeout - avoids fixed-timer compromises in safety-critical firmware recovery. |
| Block Lock™ Protection | Eight configurable protection zones (full array, upper 1/4, first 64–512 bytes) - secures bootloader, calibration tables, or security keys against accidental overwrite. |
| Self-Timed EEPROM Writes | 5 ms typical write cycle with automatic internal timing - removes software wait-state management burden from host MCU. |
| Power-Up/Down Write Inhibit | Automatic disable of all writes when VCC < VTRIP or during reset assertion - guarantees data integrity across power transients. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Maintains persistent calibration coefficients and fault history logs across repeated power cycles and brownout events. IC Role / Device Role / Timing Role: CPU supervisor providing synchronized reset release, watchdog-enforced firmware health monitoring, and tamper-resistant EEPROM storage. Use Value: Prevents corrupted calibration due to partial writes during power loss and enables deterministic recovery after watchdog-triggered resets. |
Use Scenario: Stores patient-specific therapy parameters and audit-trail timestamps in battery-backed portable ultrasound units. IC Role / Device Role / Timing Role: Dual-function supervisor + secure memory managing safe boot sequence and regulatory-compliant data retention. Use Value: Meets IEC 62304 Class C requirements via guaranteed reset validity down to 1V and hardware-blocked write access to critical settings. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Manages EEPROM-based door lock configuration and lighting profile persistence in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Voltage supervisor detecting battery dips below 2.7V and triggering controlled MCU reset before undervoltage-induced latch-up. Use Value: Eliminates need for discrete reset IC + separate EEPROM, reducing BOM count and PCB area while ensuring ASIL-B compatible supervision. |
Use Scenario: Retains tariff schedules, metering registers, and tamper-event logs under wide-input AC/DC power supplies with frequent grid fluctuations. IC Role / Device Role / Timing Role: Brownout detector with programmable VTRIP tuned to 2.7V threshold and self-timed EEPROM writes immune to supply noise. Use Value: Guarantees accurate kWh accumulation and regulatory audit trail even during 100 ms line sags - no data loss or inconsistent state. |
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 programmable VTRIP; 64 Kbit EEPROM; no Block Lock™ | Lacks field-adjustable trip point and granular write protection - suitable only where factory-set thresholds suffice. | Select when design requires proven automotive qualification (AEC-Q100) and simpler EEPROM usage without advanced lock features. |
| STM8T142M2U6 | Integrated 8-bit MCU core + 16 Kbyte Flash + 1 Kbyte EEPROM; no external I²C interface; different architecture | Replaces discrete supervisor + EEPROM with embedded firmware-controlled supervision - requires code development. | Select when system needs programmable reset logic, dynamic watchdog reconfiguration, or custom power-sequence timing not possible with fixed-function ICs. |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4283S8-2.7A uniquely balances hardware configurability (programmable VTRIP, three watchdog timeouts, eight-block protection) with zero-software overhead - making it optimal for cost-sensitive, high-reliability designs needing field-tunable supervision without MCU intervention.
Availability
X4283S8-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, smart energy meters, and embedded IoT gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for X4283S8-2.7A 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 Inc., acquired by Renesas Electronics in 2008, specialized in nonvolatile memory and power management ICs with focus on reliability, low-power operation, and system-level integration.
The X4283/85 product line was designed to consolidate reset supervision, watchdog monitoring, and EEPROM storage into a single chip - targeting cost-constrained, space-limited embedded systems where board real estate and BOM simplification are critical.
FAQ
What is the default VTRIP threshold voltage for the X4283S8-2.7A?
The X4283S8-2.7A ships with a factory-programmed VTRIP threshold of 2.63V. This value remains stable over temperature and time unless explicitly reprogrammed using the high-voltage VTRIP adjustment procedure described in the datasheet. The X4283S8-2.7A retains this setting across power cycles due to nonvolatile configuration storage.
Can the X4283S8-2.7A watchdog timer be disabled after power-up?
Yes - the X4283S8-2.7A watchdog timer is disabled by default (WD1=1, WD0=1). It can be enabled or reconfigured at runtime by writing to the nonvolatile control register (address FFFFh) after setting WEL and RWEL latches. Once set, the watchdog timeout remains active until changed again; no hardware pin disables it independently.
Does the X4283S8-2.7A support standard I²C addressing?
Yes - the X4283S8-2.7A uses standard 7-bit I²C addressing with device identifier '1010' followed by two hardware-select bits (S1/S0) and R/W bit. Its base address is 0xA0 (S1=0, S0=0, write) or 0xA1 (read), scalable to four unique addresses on one bus. It fully complies with I²C protocol timing, acknowledge, and arbitration rules.
How does the X4283S8-2.7A prevent inadvertent EEPROM writes during power transitions?
The X4283S8-2.7A incorporates dual protection: (1) automatic write inhibit when VCC falls below VTRIP or RESET/RESET is asserted, and (2) mandatory volatile WEL/RWEL latching before any nonvolatile write. Both mechanisms ensure no EEPROM write initiates or completes outside valid operating voltage - preserving data integrity during power-up, brownout, or reset.
Is the X4283S8-2.7A pin-compatible with other X4283/X4285 variants?
Yes - the X4283S8-2.7A shares identical 8-pin SOIC/TSSOP pinout and electrical behavior with all X4283/X4285 family members, including X4283S8-3.0A and X4285S8-2.7A. Differences are limited to factory-set VTRIP voltage and part-number suffix; no PCB layout change is required when substituting within the same package type.
X4283S8-2.7A 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4283S8-2.7A FAQ
1.How can I place an order for X4283S8-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4283S8-2.7A 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 X4283S8-2.7A reliable?
The price and inventory of X4283S8-2.7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4283S8-2.7A is usually 5 days.
3.What payment methods are accepted for X4283S8-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4283S8-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4283S8-2.7A?
X4283S8-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4283S8-2.7A 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 X4283S8-2.7A?
For technical support, including X4283S8-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4283S8-2.7A requirements.
6.How does Aetrix verify that X4283S8-2.7A is sourced from the original manufacturer or authorized distributors?
All X4283S8-2.7A 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 X4283S8-2.7A meets industry standards.
7.What is the process for return or replacement of X4283S8-2.7A?
All X4283S8-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4283S8-2.7A, 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 X4283S8-2.7A part is unused and in its original packaging.
Return procedure for X4283S8-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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