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Renesas X4163PI
- Part No.:
- X4163PI
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4163PI.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,781
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Product details
Overview
X4163PI 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 a single 8-lead SOIC package. It provides selectable watchdog timeout (200 ms / 600 ms / 1.4 s), low-VCC reset assertion down to 1 V, and 400 kHz 2-wire interface - used in microcontroller-based embedded systems for reliable boot sequencing and data retention.
For engineers reviewing the X4163PI datasheet, X4163PI pinout, X4163PI application, or X4163PI equivalent, key selection considerations include programmable VTRIP threshold, block-lock EEPROM protection, active-low/high open-drain RESET output timing, and watchdog restart via SDA edge detection during SCL HIGH.
Technical Context
The X4163PI implements a dual-function reset architecture: power-on reset with 250 ms release delay after VCC stabilization, and brownout detection with 200 ms hysteresis after VCC recovery. Its watchdog timer monitors SDA transitions only when SCL is HIGH, enforcing strict I²C start-bit timing for timeout reset.
EEPROM operation uses 64-byte page write mode with self-timed 5 ms typical write cycle; write protection combines volatile WEL/RWEL latches, nonvolatile BP2–BP0 block lock bits, and hardware WP pin + WPEN bit enabling hardware-level memory locking independent of software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| EEPROM capacity | 16 Kbit (2 K × 8), organized as 2048 addressable bytes for firmware parameter storage or calibration data retention |
| Reset output type | Open-drain RESET/RESET, active LOW/HIGH depending on variant - enables flexible logic-level interfacing with diverse MCU reset inputs |
| Watchdog timeout options | 200 ms, 600 ms, or 1.4 s (set by WD1/WD0 bits); factory default = disabled - supports precise fail-safe timing without external components |
| VTRIP adjustability | Reprogrammable threshold (1.7 V to 5.0 V range) via nonvolatile VCC-based programming sequence - eliminates need for external resistor dividers |
| Supply voltage range | 2.7 V to 5.5 V - interoperable across 3.3 V and 5 V system rails without level-shifting |
| Standby current | <1 µA (watchdog OFF) or <20 µA (watchdog ON) - suitable for battery-backed or ultra-low-power monitoring applications |
| I²C interface speed | 400 kHz maximum - compatible with standard Fast-mode I²C controllers without clock stretching penalties |
Pinout & Package
Package: 8-lead JEDEC SOIC (3.9 mm × 4.9 mm, 1.27 mm pitch). Pinout validated per Xicor Rev 1.32 datasheet (May 2004).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input - sets LSB of I²C slave address (A0) for multi-device bus addressing |
| 2 (SOIC) | S1 | Device select input - sets MSB of I²C slave address (A1) for up to four X4163PI devices on same bus |
| 3 (SOIC) | RESET/RESET | Open-drain reset output - asserts active LOW or HIGH (X4163 vs X4165 variant) during power-up, brownout, or watchdog timeout |
| 4 (SOIC) | VSS | Ground reference - must be connected directly to system ground plane for stable reset timing and noise immunity |
| 5 (SOIC) | SDA | Bidirectional I²C data line - requires external pull-up; rising/falling edges during SCL HIGH trigger watchdog reset |
| 6 (SOIC) | SCL | I²C clock input - synchronizes all serial transfers and defines watchdog sampling window boundaries |
| 7 (SOIC) | WP | Hardware write protect enable - when HIGH + WPEN bit set, blocks all EEPROM writes and control register changes |
| 8 (SOIC) | VCC | Power supply input - powers all internal circuits and serves as reference for VTRIP programming voltage |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP threshold | Nonvolatile reprogramming over 1.7–5.0 V range using VCC as programming voltage - enables precise brownout detection without external components |
| Block Lock EEPROM protection | Selectable lock granularity: full array, first 8 pages (512 B), first 4 pages (256 B), first 2 pages (128 B), or first page (64 B) - prevents corruption of critical firmware or calibration data |
| Three-step control register write | Requires sequential WEL → RWEL → data writes with stop conditions - prevents accidental modification of watchdog or block lock settings |
| Watchdog restart via I²C start condition | SDA falling edge while SCL HIGH resets timer - leverages existing I²C bus activity instead of requiring dedicated watchdog strobe lines |
| Power-up reset hold time | 250 ms minimum active reset duration - ensures sufficient time for oscillator stabilization and FPGA configuration before MCU execution |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controller with field-updatable firmware and runtime parameter storage. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset coordination, brownout protection during AC line dips, and EEPROM-backed configuration persistence. Use Value: Prevents erratic behavior during unstable mains conditions; retains calibrated sensor offsets and user-defined I/O mappings across power cycles. |
Use Scenario: Portable ultrasound or ECG unit requiring FDA-compliant data integrity and deterministic boot behavior. IC Role / Device Role / Timing Role: System monitor ensuring safe initialization, detecting undervoltage events during battery discharge, and safeguarding patient calibration data in EEPROM. Use Value: Guarantees reset assertion until VCC ≥ VTRIP + 200 ms hysteresis; blocks unauthorized writes via hardware WP pin during clinical operation. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: CAN-connected BCM managing door locks, lighting, and HVAC with EEPROM-stored vehicle-specific settings. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during cold-crank voltage sag (<6.5 V), restarting watchdog on periodic CAN message ACKs. Use Value: Eliminates need for discrete reset IC + EEPROM; programmable VTRIP matches automotive 12 V system brownout thresholds. |
Use Scenario: Revenue-grade meter with tamper-detection logging and tariff schedule updates stored in nonvolatile memory. IC Role / Device Role / Timing Role: Power supervisor holding MCU in reset during AC dropout, while EEPROM stores billing history with block-lock protection against firmware overwrite. Use Value: Self-timed 5 ms EEPROM writes ensure data commits before backup capacitor depletion; WP pin disables writes during meter firmware upgrades. |
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 |
|---|---|---|---|
| MAX6361KA+T | Fixed 2.93 V reset threshold; no VTRIP reprogramming; 1 Kbit EEPROM; 100 kHz I²C only | Lacks adjustable brownout detection and high-speed EEPROM access - suitable only for basic reset + small config storage | Choose when design requires guaranteed long-term availability and simpler qualification, not programmable VTRIP |
| STM8T142M2U6 | Integrated 8-bit MCU core; 4 Kbyte Flash; 128 byte EEPROM; fixed 2.5 V reset; no external I²C interface | Replaces discrete supervisor + MCU but adds firmware development overhead - no external EEPROM expandability | Choose when system consolidation justifies added software complexity and forfeits external I²C EEPROM flexibility |
Compared with X4163PI, MAX6361KA+T offers higher production volume but sacrifices VTRIP tuning and EEPROM density, while STM8T142M2U6 embeds intelligence at the cost of external bus access and configurable reset behavior.
Availability
X4163PI is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive body control modules, smart energy meters, and battery-powered IoT edge nodes requiring stable component supply and long-lifecycle support.
Supply support for X4163PI 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 for embedded systems before integration into Renesas' analog and power portfolio.
The X4163PI belongs to Xicor's CPU Supervisor + EEPROM family, designed to reduce board space and BOM count in resource-constrained microcontroller systems requiring coordinated reset, watchdog, voltage monitoring, and persistent data storage.
FAQ
What is the function of the S0 and S1 pins on the X4163PI?
The S0 and S1 pins on the X4163PI serve as device-select inputs that configure the two most significant bits (A1, A0) of the I²C slave address. This allows up to four X4163PI devices to share the same I²C bus without address conflict. Their states (HIGH/LOW) directly determine the 7-bit address prefix '1010xx0', where 'xx' maps to S1:S0. The X4163PI does not interpret these pins as general-purpose I/O or control signals beyond address setting.
How does the X4163PI's watchdog timer get reset, and what triggers a timeout?
The X4163PI watchdog timer resets on a HIGH-to-LOW transition of the SDA pin while SCL is held HIGH - matching the I²C start condition timing. If no such transition occurs within the selected timeout interval (200 ms, 600 ms, or 1.4 s), the device asserts RESET/RESET. The timer does not monitor SCL edges or generic bus activity - only this specific SDA edge under SCL HIGH. This ensures compatibility with standard I²C communication patterns.
Can the reset threshold voltage (VTRIP) of the X4163PI be changed after soldering to the PCB?
Yes, the X4163PI's VTRIP threshold can be reprogrammed in-system after soldering using its nonvolatile programming sequence. It requires applying the desired VTRIP value to VCC, a 12–15 V pulse to the WP pin, and issuing a specific two-byte write command (A0h followed by 00h) with WEL set. No external programming hardware is needed - the procedure uses only standard I²C commands and controlled voltage application, making it feasible for field calibration or design iteration.
What happens to ongoing EEPROM writes when the X4163PI asserts RESET/RESET?
When RESET/RESET goes active on the X4163PI due to brownout or watchdog timeout, any in-progress EEPROM write operation is allowed to complete normally, but no new writes may be initiated until RESET/RESET deasserts. During RESET/RESET assertion, the I²C interface is disabled, preventing further commands. This ensures data integrity: partially written pages are either fully committed or left unmodified, avoiding partial-page corruption scenarios common in unprotected EEPROMs.
Is the X4163PI pin-compatible with the X4165PI, and how do their reset outputs differ?
No, the X4163PI and X4165PI are not pin-compatible despite identical pinouts - they differ in RESET/RESET polarity and internal logic. The X4163PI features an active-HIGH open-drain RESET output, while the X4165PI provides active-LOW. This difference is hardwired internally and cannot be configured via registers. Swapping them without adjusting external pull-up/down networks and MCU reset input expectations will cause functional failure. Always verify the suffix '3' vs '5' in the full part number.
X4163PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
X4163PI FAQ
1.How can I place an order for X4163PI through Aetrix?
Please submit a Request for Quotation (RFQ) for X4163PI 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 X4163PI reliable?
The price and inventory of X4163PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4163PI is usually 5 days.
3.What payment methods are accepted for X4163PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4163PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4163PI?
X4163PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4163PI 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 X4163PI?
For technical support, including X4163PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4163PI requirements.
6.How does Aetrix verify that X4163PI is sourced from the original manufacturer or authorized distributors?
All X4163PI 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 X4163PI meets industry standards.
7.What is the process for return or replacement of X4163PI?
All X4163PI units undergo pre-shipment inspection (PSI). If there is an issue with X4163PI, 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 X4163PI part is unused and in its original packaging.
Return procedure for X4163PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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