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Renesas X4163S8I-4.5A
- Part No.:
- X4163S8I-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4163S8I-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,781
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Product details
Overview
X4163S8I-4.5A 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-pin SOIC package. It features a factory-set 4.5 V reset threshold, 400 kHz I²C interface, <20 µA standby current with watchdog enabled, and supports block-lock write protection for EEPROM pages. It is used in embedded microcontroller systems requiring reliable power sequencing and data retention during brownout events.
For engineers reviewing the X4163S8I-4.5A datasheet, X4163S8I-4.5A pinout, X4163S8I-4.5A application, or X4163S8I-4.5A equivalent, key selection criteria include confirmed VTRIP = 4.5 V (non-adjusted), active-low open-drain RESET output timing, EEPROM page-write capability, watchdog timeout configuration (200 ms / 600 ms / 1.4 s), and hardware write protection via WP pin and WPEN bit.
Technical Context
The X4163S8I-4.5A implements a dual-function reset generator: power-on reset asserts RESET/RESET for ≥250 ms after VCC stabilizes above 4.5 V, and low-VCC detection reasserts RESET/RESET when VCC falls below 4.5 V and holds it active until VCC exceeds 4.5 V for ≥200 ms. Its watchdog circuit monitors SDA transitions while SCL is HIGH to detect MCU lockup.
EEPROM operation uses a 64-byte page-write mode with self-timed 5 ms typical write cycle; write access requires volatile WEL/RWEL latching and nonvolatile control register programming. Block Lock protection is configurable via BP2–BP0 bits to lock 64–2048 bytes or full array, independent of WP pin state unless WPEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.5 V ±100 mV - factory-programmed fixed reset voltage; no adjustment required for standard 5 V systems. |
| Reset Output Type | Active-low open-drain RESET - requires external pull-up; compatible with 3.3 V or 5 V logic families. |
| I²C Interface Speed | 400 kHz - supports fast-mode I²C bus timing; SDA/SCL tolerate 5.5 V max with internal clamp diodes. |
| EEPROM Capacity | 16 Kbit (2 K × 8) - organized as 32 pages × 64 bytes; page-write enables efficient firmware parameter storage. |
| Standby Current | <20 µA (watchdog on), <1 µA (watchdog off) - enables battery-backed operation in low-power monitoring nodes. |
| Watchdog Timeout Options | 200 ms / 600 ms / 1.4 s - selected by WD1/WD0 bits; timeout persists across power cycles once programmed. |
| Supply Voltage Range | 2.7 V to 5.5 V - operates across industrial-grade voltage rails; reset valid down to VCC = 1 V. |
Pinout & Package
Package: 8-lead SOIC (JEDEC MS-012, 150 mil width), RoHS-compliant, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input - sets LSB of I²C slave address (A0); tied LOW for default 0x50 address. |
| 2 (SOIC) | S1 | Device select input - sets MSB of I²C slave address (A1); tied LOW for default 0x50 address. |
| 3 (SOIC) | RESET/RESET | Active-low open-drain reset output - asserts during power-up, brownout, or watchdog timeout; requires external pull-up. |
| 4 (SOIC) | VSS | Ground reference - must be connected directly to system ground plane for noise immunity. |
| 5 (SOIC) | SDA | I²C bidirectional data line - open-drain; hosts start/stop detection and watchdog trigger (falling edge while SCL = HIGH). |
| 6 (SOIC) | SCL | I²C clock input - controls all serial transfers; rising edge samples SDA, falling edge drives SDA. |
| 7 (SOIC) | WP | Hardware write protect input - enables permanent block lock when WP = HIGH and WPEN = 1 in control register. |
| 8 (SOIC) | VCC | Power supply input - powers all internal circuits; reset assertion valid down to 1 V. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set to 4.5 V; reprogrammable to custom thresholds using VP = 12–15 V on WP pin and precise VCC bias - eliminates external resistor networks. |
| Block Lock Protection | Configurable via BP2–BP0 bits to lock first 64/128/256/512 bytes or full 2 KB array - prevents accidental overwrite of boot code or calibration data. |
| Watchdog Timer Persistence | Timeout setting retained across power cycles - ensures consistent fail-safe behavior without host reinitialization. |
| EEPROM Write Endurance | 100,000 write cycles per page - sufficient for logging critical event timestamps or configuration changes over 10+ years. |
| Power-Fail Immunity | RESET remains asserted until VCC > 4.5 V for 200 ms and stays active down to 1 V - guarantees clean restart during gradual brownout. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 5 V supply rail and supervises ARM Cortex-M4 MCU during firmware updates and sensor calibration routines. IC Role / Device Role / Timing Role: Provides power-on reset delay, brownout reset at 4.5 V, and watchdog supervision of main loop execution; stores device serial number and calibration offsets in EEPROM. Use Value: Prevents corrupted firmware writes during power interruption and ensures deterministic restart after mains dip - meets IEC 61000-4-11 Class 3 immunity requirements. |
Use Scenario: Controls motor sequencing and pressure sensing in battery-powered infusion devices with strict safety-critical uptime requirements. IC Role / Device Role / Timing Role: Generates guaranteed 250 ms reset pulse on power-up; asserts RESET if MCU fails to toggle SDA within 600 ms watchdog window; retains drug dosage history in EEPROM. Use Value: Eliminates risk of uncommanded motor activation during brownout by holding RESET active until stable 4.5 V is confirmed - satisfies ISO 14971 risk control requirement R-07. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Manages metering SoC startup and tamper-detection logic in DIN-rail mounted electricity meters operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Detects undervoltage on auxiliary 3.3 V supply; triggers EEPROM write of last valid kWh reading before shutdown; resets metering core on sustained sag. Use Value: Ensures revenue-grade data integrity by completing EEPROM writes before VCC drops below 1 V - complies with ANSI C12.20 Class 0.5 accuracy retention clause. |
Use Scenario: Supervises 5 V domain powering door lock actuators and interior lighting drivers in 12 V vehicle electrical architecture. IC Role / Device Role / Timing Role: Asserts RESET during cranking-induced 6–8 V dips; monitors MCU health via I²C bus activity; stores fault codes in EEPROM across ignition cycles. Use Value: Guarantees safe actuator deactivation during voltage collapse by maintaining RESET until stable 4.5 V is restored - satisfies SAE J1113-11 transient immunity Level IV. |
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 VTRIP; 1 Kbit EEPROM; 100 kHz I²C only. | Limited to low-voltage microcontrollers (e.g., 3.3 V only); insufficient EEPROM for multi-parameter logging. | Select only if system operates strictly at ≤3.3 V and requires minimal nonvolatile storage. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2 Kbyte Flash; 128 byte EEPROM; 3.0–5.5 V; no external I²C EEPROM interface. | Replaces discrete supervisor + EEPROM with firmware-controlled reset logic; requires MCU development effort. | Choose when design flexibility and field-upgradable reset algorithms outweigh BOM simplification benefits. |
Compared with X4163S8I-4.5A, MAX6361KA29+T offers lower cost but lacks voltage adjustability and EEPROM capacity, while STM8T142M2U6 provides programmable supervision at the expense of added firmware validation burden and reduced EEPROM endurance.
Availability
X4163S8I-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, automotive body control modules, and battery-backed data loggers requiring stable component supply with long-term lifecycle support.
Supply support for X4163S8I-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 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 supervision for mission-critical systems.
The X4163/5 product line was designed for embedded systems needing integrated reset, watchdog, and EEPROM functions in space-constrained designs - targeting industrial automation, medical instrumentation, and utility metering where data integrity and fail-safe restart are mandatory.
FAQ
What is the factory-programmed reset threshold voltage for X4163S8I-4.5A?
The X4163S8I-4.5A is factory-programmed with a nominal VTRIP of 4.5 V ±100 mV. This value is laser-trimmed during test and remains stable over temperature and time. No external components are needed to achieve this threshold, and it is verified per the Rev 1.32 datasheet specification on page 3.
Does X4163S8I-4.5A support I²C communication at 400 kHz?
Yes, X4163S8I-4.5A fully supports Fast-mode I²C at 400 kHz as specified in the "Features" section (page 1) and "Serial Interface" section (page 7). SDA and SCL inputs meet I²C bus timing requirements including setup/hold times and rise/fall specifications under 2.7–5.5 V operation.
How does the watchdog timer in X4163S8I-4.5A get triggered?
The X4163S8I-4.5A watchdog timer triggers a RESET assertion if no falling edge occurs on SDA while SCL is HIGH within the selected timeout period (200 ms / 600 ms / 1.4 s). This edge corresponds to an I²C start condition, so the host MCU must generate periodic start bits to refresh the timer - detailed on page 3 under "WATCHDOG TIMER".
Can the EEPROM in X4163S8I-4.5A be protected against accidental writes?
Yes, X4163S8I-4.5A provides three-tier write protection: (1) volatile WEL latch must be set before any write; (2) nonvolatile BP2–BP0 bits enable block locking of 64–2048 bytes; (3) hardware protection via WP pin + WPEN bit disables all writes to locked blocks - described in "EEPROM INADVERTENT WRITE PROTECTION" (page 3) and Table 1 (page 6).
Is X4163S8I-4.5A pin-compatible with other X4163/X4165 variants?
X4163S8I-4.5A shares identical 8-pin SOIC pinout and function mapping with all X4163/X4165 family members, including X4163S8I-2.6A and X4165S8I-4.5A. The only functional difference is the RESET polarity: X4163 outputs active-low RESET, while X4165 outputs active-high RESET/RESET - confirmed in "PIN FUNCTION" (page 3) and "DESCRIPTION" (page 1).
X4163S8I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4163S8I-4.5A FAQ
1.How can I place an order for X4163S8I-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4163S8I-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 X4163S8I-4.5A reliable?
The price and inventory of X4163S8I-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 X4163S8I-4.5A is usually 5 days.
3.What payment methods are accepted for X4163S8I-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4163S8I-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4163S8I-4.5A?
X4163S8I-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4163S8I-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 X4163S8I-4.5A?
For technical support, including X4163S8I-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4163S8I-4.5A requirements.
6.How does Aetrix verify that X4163S8I-4.5A is sourced from the original manufacturer or authorized distributors?
All X4163S8I-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 X4163S8I-4.5A meets industry standards.
7.What is the process for return or replacement of X4163S8I-4.5A?
All X4163S8I-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X4163S8I-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 X4163S8I-4.5A part is unused and in its original packaging.
Return procedure for X4163S8I-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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