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Renesas X4163V8
- Part No.:
- X4163V8
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
X4163V8.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
X4163V8 from Xicor (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 16 Kbit serial EEPROM in an 8-lead SOIC package. It features selectable watchdog timeout (200 ms / 600 ms / 1.4 s), four standard VCC reset thresholds (2.63 V / 2.93 V / 3.08 V / 4.38 V), and operates from 2.7 V to 5.5 V. It is used in microcontroller-based embedded systems requiring reliable power sequencing and nonvolatile configuration storage.
For engineers reviewing the X4163V8 datasheet, X4163V8 pinout, X4163V8 application, or X4163V8 equivalent, key selection criteria include its dual-role RESET/RESET output (active-low/open-drain), programmable VTRIP threshold via on-chip procedure, 400 kHz I²C-compatible 2-wire interface, and hardware block-lock protection for EEPROM pages.
Technical Context
The X4163V8 implements a dedicated low-voltage detection circuit with hysteresis that asserts RESET/RESET down to VCC = 1 V and holds it active for 250 ms after VCC recovers above VTRIP. Its watchdog timer monitors SDA transitions during SCL HIGH and supports three fixed timeout intervals set by nonvolatile WD1/WD0 bits.
It integrates a 2K × 8-bit EEPROM array with 64-byte page write capability, self-timed 5 ms typical write cycle, and multi-level write protection: power-up/power-down lock, volatile WEL/RWEL latches, nonvolatile BP2–BP0 block lock bits, and hardware WP pin + WPEN bit control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| EEPROM capacity | 16 Kbit (2K × 8), organized as 256 pages of 64 bytes each - enables efficient firmware parameter storage with page-level granularity. |
| Reset threshold options | Four factory-set VTRIP values: 2.63 V, 2.93 V, 3.08 V, 4.38 V - covers common microcontroller supply rails without external components. |
| Watchdog timeout | Selectable: 200 ms, 600 ms, or 1.4 s (WD1/WD0 bits) - provides flexible fail-safe timing for diverse MCU execution cycles. |
| Supply voltage range | 2.7 V to 5.5 V - supports both 3.3 V and 5 V system domains with single-supply operation. |
| I²C interface speed | Up to 400 kHz - compatible with standard-mode I²C controllers and allows fast configuration reads/writes. |
| Standby current | <20 µA (watchdog enabled), <1 µA (watchdog disabled) - minimizes battery drain in always-on monitoring applications. |
| Reset assertion validity | Valid down to VCC = 1 V - ensures deterministic reset behavior during deep brownout conditions. |
Pinout & Package
Package: 8-lead SOIC (JEDEC MS-012), 150 mil width, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input - sets LSB of I²C slave address (A0); tied HIGH/LOW to configure one of two device addresses on shared bus. |
| 2 (SOIC) | S1 | Device select input - sets MSB of I²C slave address (A1); enables up to four X4163V8 devices on same 2-wire 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 - return path for all internal circuits and reset driver. |
| 5 (SOIC) | SDA | Serial data I/O - bidirectional, open-drain I²C data line; also serves as watchdog trigger input (falling edge while SCL HIGH). |
| 6 (SOIC) | SCL | Serial clock input - synchronous timing signal for I²C communication and watchdog sampling window. |
| 7 (SOIC) | WP | Write protect input - when HIGH and WPEN bit set, blocks all nonvolatile writes including control register changes. |
| 8 (SOIC) | VCC | Power supply input - powers all internal functions including reset generator, watchdog, and EEPROM array. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | VTRIP can be reprogrammed to custom voltage (e.g., 3.15 V ±10 mV) using on-chip sequence with VP on WP pin - eliminates need for external resistor dividers. |
| Block Lock protection | Configurable via BP2–BP0 bits to lock 64 B, 128 B, 256 B, 512 B, or full 2 KB EEPROM - prevents accidental overwrite of critical boot or calibration data. |
| Self-timed EEPROM write | 5 ms typical internal write cycle with automatic completion detection - no external timing control required; host uses ACK polling to verify readiness. |
| Dual reset source | Single RESET/RESET pin driven by both low-VCC detection and watchdog timeout - simplifies system reset architecture with unified signal path. |
| Power-on reset duration | 250 ms minimum assertion time after VCC stabilization - guarantees sufficient delay for oscillator startup and FPGA configuration before processor release. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
|
Use Scenario: A programmable logic controller maintains calibrated sensor offsets and runtime fault logs in nonvolatile memory while supervising its main MCU. IC Role / Device Role / Timing Role: X4163V8 provides power-on reset, brownout protection, and watchdog supervision while storing calibration constants in its 16 Kbit EEPROM. Use Value: Eliminates external reset IC and discrete EEPROM, reducing BOM count and PCB area; block lock prevents corruption of factory-calibrated parameters during field firmware updates. |
Use Scenario: A portable ultrasound unit must retain user preferences and last-used imaging settings across battery swaps and unexpected shutdowns. IC Role / Device Role / Timing Role: X4163V8 acts as system supervisor and configuration store - asserting RESET/RESET if VCC drops below 2.93 V during battery depletion and preserving settings in EEPROM. Use Value: Guarantees safe shutdown and consistent UI state restoration; programmable VTRIP allows precise match to Li-ion discharge curve (e.g., 3.0 V cutoff). |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: An ANSI C12.20-compliant electricity meter records tamper events and billing data under wide temperature and voltage fluctuations. IC Role / Device Role / Timing Role: X4163V8 monitors 3.3 V rail, triggers watchdog if metrology firmware hangs, and stores event timestamps in protected EEPROM pages. Use Value: Meets IEC 62056 reliability requirements; 1 V reset validity ensures deterministic behavior during severe brownouts common in grid-edge deployments. |
Use Scenario: A BCM manages door locks, lighting, and window controls, requiring secure storage of anti-theft keys and failure history. IC Role / Device Role / Timing Role: X4163V8 delivers reset signaling during cold-crank (low-battery) conditions and safeguards cryptographic keys using hardware WP + BP bits. Use Value: Prevents unauthorized EEPROM access even if MCU is compromised; 2.7–5.5 V operation supports 12 V vehicle system transients. |
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 2.93 V reset threshold; no VTRIP programming; 1 Kbit EEPROM; 100 kHz I²C only | Lacks adjustable trip point and higher-speed interface - suitable only for cost-sensitive, static-threshold designs | Choose when VTRIP tuning is unnecessary and 400 kHz bandwidth is not required. |
| STM8T142M2U6 | Integrated 32-bit watchdog, 2.5–5.5 V range, but no EEPROM - requires external memory | Offers enhanced watchdog features (windowed, early warning) but increases board complexity and component count | Prefer when advanced watchdog functionality outweighs integration benefits and external EEPROM is already present. |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4163V8 uniquely combines field-programmable VTRIP, 400 kHz I²C, and 16 Kbit EEPROM in a single SOIC-8 - delivering higher integration density and design flexibility for space-constrained embedded systems.
Availability
X4163V8 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply and long-term lifecycle support.
Supply support for X4163V8 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. Its legacy products remain widely deployed in industrial and automotive systems.
The X4163V8 belongs to Xicor's CPU Supervisor + EEPROM family, designed to reduce system-level component count and improve reliability in microcontroller-based applications where power integrity and configuration persistence are critical.
FAQ
What is the function of the S0 and S1 pins on the X4163V8?
The S0 and S1 pins on the X4163V8 configure the two most significant bits (A1, A0) of its I²C slave address, enabling up to four X4163V8 devices on the same 2-wire bus. S0 maps to A0 and S1 to A1; both are sampled at power-up and held static during operation. This allows differentiated addressing without external resistors or jumpers, simplifying multi-device system design while maintaining compatibility with standard I²C protocol.
How does the X4163V8 handle reset assertion during power-up?
The X4163V8 asserts RESET/RESET for a minimum of 250 ms after VCC rises above the selected VTRIP threshold, ensuring oscillator stabilization and FPGA configuration completion before releasing the microcontroller. This power-on reset is generated independently of the watchdog or voltage monitor circuits and remains active until the internal power-on reset timer expires - a deterministic behavior confirmed in the device's PRINCIPLES OF OPERATION section.
Can the VTRIP threshold of the X4163V8 be adjusted in-circuit?
Yes, the X4163V8 supports in-system VTRIP reprogramming using a defined 3-step sequence: set WEL bit, apply desired VTRIP voltage to VCC, and apply 12–15 V programming pulse to WP pin while writing specific command bytes. This allows field calibration to match application-specific supply tolerances - for example, setting VTRIP to 3.15 V for a 3.3 V rail with ±3% regulation - without requiring device replacement.
What EEPROM protection mechanisms does the X4163V8 provide?
The X4163V8 implements five-tier EEPROM protection: (1) power-up/power-down lock, (2) volatile WEL/RWEL latches, (3) nonvolatile BP2–BP0 block lock bits (configurable per 64–2048 byte segments), (4) hardware WP pin + WPEN bit enabling full-array write disable, and (5) automatic halt of all writes during RESET/RESET assertion. These layers prevent accidental or malicious corruption of stored data - critical for calibration tables, security keys, and operational logs.
Is the X4163V8 pin-compatible with other members of the X4163/5 family?
Yes, the X4163V8 shares identical pinout, package, and electrical interface with all X4163/X4165 variants (e.g., X4163V5, X4165V8), differing only in reset polarity: X4163V8 provides active-low RESET output, while X4165V8 provides active-high RESET. This allows direct substitution in designs where reset polarity is managed externally or configurable in firmware - verified by matching SOIC-8 pin assignments and functional descriptions in the PIN FUNCTION table.
X4163V8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- -
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
X4163V8 FAQ
1.How can I place an order for X4163V8 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4163V8 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 X4163V8 reliable?
The price and inventory of X4163V8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4163V8 is usually 5 days.
3.What payment methods are accepted for X4163V8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4163V8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4163V8?
X4163V8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4163V8 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 X4163V8?
For technical support, including X4163V8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4163V8 requirements.
6.How does Aetrix verify that X4163V8 is sourced from the original manufacturer or authorized distributors?
All X4163V8 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 X4163V8 meets industry standards.
7.What is the process for return or replacement of X4163V8?
All X4163V8 units undergo pre-shipment inspection (PSI). If there is an issue with X4163V8, 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 X4163V8 part is unused and in its original packaging.
Return procedure for X4163V8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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