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Renesas X4163S8-4.5A
- Part No.:
- X4163S8-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4163S8-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
X4163S8-4.5A from Xicor (now part of Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 16 Kbit serial EEPROM in an 8-pin SOIC package. It features selectable watchdog timeout (200 ms / 600 ms / 1.4 s), four factory-standard VTRIP thresholds (including 4.5 V), and operates from 2.7 V to 5.5 V - used in microcontroller-based embedded systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4163S8-4.5A datasheet, X4163S8-4.5A pinout, X4163S8-4.5A application, or X4163S8-4.5A equivalent, key selection criteria include its programmable 4.5 V reset threshold, 400 kHz I²C-compatible 2-wire interface, 64-byte page write EEPROM, <20 µA standby current with watchdog enabled, and open-drain active-low RESET output with 250 ms reset pulse width after power-up.
Technical Context
The X4163S8-4.5A implements a dual-function reset architecture: power-on reset generation with 250 ms delay and low-VCC detection at precisely 4.5 V nominal (±150 mV), asserting RESET/RESET until VCC exceeds threshold for 200 ms. Its watchdog timer monitors SDA transitions during SCL HIGH and supports three fixed timeout intervals via nonvolatile WD1/WD0 bits.
It embeds a 2K × 8-bit EEPROM array with page-write capability (64-byte pages), self-timed 5 ms typical write cycle, and hardware/software write protection including Block Lock (BP2–BP0), WPEN bit, and WP pin control. All functions operate over a single 2.7–5.5 V supply with CMOS-level I²C-compatible SDA/SCL signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | 4.5 V ±150 mV - factory-programmed reset activation voltage; stable across temperature and supply ripple. |
| Reset Output Type | Active-low open-drain RESET - requires external pull-up; asserts down to VCC = 1 V and holds for 250 ms after power-up stabilization. |
| Watchdog Timeout | Selectable: 200 ms / 600 ms / 1.4 s - set via nonvolatile WD1/WD0 bits; triggered by missing SDA falling edge during SCL HIGH. |
| EEPROM Capacity | 16 Kbit (2 K × 8) - organized as 64-byte pages; supports byte and page writes; 5 ms typical write time per page. |
| Supply Voltage Range | 2.7 V to 5.5 V - single-rail operation compatible with 3.3 V and 5 V logic systems without level shifting. |
| Interface Speed | 400 kHz 2-wire (I²C-compatible) - supports standard-mode timing; SDA/SCL tolerate 5.5 V max. |
| Standby Current | <20 µA (watchdog on), <1 µA (watchdog off) - enables ultra-low-power battery-backed operation. |
Pinout & Package
Package: 8-lead SOIC (JEDEC MS-012AC, 150 mil width), RoHS-compliant, moisture sensitivity level MSL3.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S0 | Device select input - sets LSB of I²C slave address (A0); tied LOW or HIGH to configure device address. |
| 2 | S1 | Device select input - sets MSB of I²C slave address (A1); enables up to four devices on same bus. |
| 3 | RESET/RESET | Active-low open-drain reset output - asserted during power-up, brownout (VCC < 4.5 V), or watchdog timeout. |
| 4 | VSS | Ground reference - must be connected directly to system ground plane for noise immunity. |
| 5 | SDA | Serial data bidirectional I/O - open-drain; requires external pull-up; carries I²C data and watchdog trigger signal. |
| 6 | SCL | Serial clock input - synchronous timing source for I²C communication; controls EEPROM read/write timing. |
| 7 | WP | Write protect input - when HIGH + WPEN bit set, blocks all EEPROM and control register writes (hardware lock). |
| 8 | VCC | Positive supply input - powers all internal circuits; also used as reference for VTRIP calibration during programming. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set to 4.5 V but reprogrammable to custom thresholds using VP (12–15 V) on WP pin and VCC = target voltage. |
| Block Lock Protection | Configurable via BP2–BP0 bits to protect 64 B to full 2 KB array - prevents accidental firmware or calibration data overwrite. |
| Self-Timed EEPROM Write | No external timing control needed; internal circuitry completes 5 ms write autonomously after STOP condition. |
| Power-Up Reset Hold Time | 250 ms minimum - ensures microcontroller and oscillator stability before release of RESET/RESET signal. |
| Watchdog Independence | Operates without host intervention; timeout persists across power cycles unless WD bits are explicitly cleared. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Microcontroller supervises motor control, sensor acquisition, and safety interlocks in harsh industrial environments with fluctuating 24 V DC supplies stepped down to 5 V. IC Role / Device Role / Timing Role: X4163S8-4.5A provides brownout reset at 4.5 V to prevent erratic MCU behavior during line sag, while its EEPROM stores calibrated sensor offsets and fault logs. Use Value: Prevents unsafe actuation during undervoltage; eliminates need for discrete reset IC + separate EEPROM, reducing BOM count and PCB area by 30%. |
Use Scenario: Battery-powered infusion pump uses low-power MCU to regulate flow rate, monitor occlusion pressure, and log delivery history. IC Role / Device Role / Timing Role: X4163S8-4.5A delivers 250 ms power-on reset for safe initialization and watchdog supervision to detect MCU lockup during critical drug delivery phases. Use Value: Ensures fail-safe shutdown if MCU freezes; EEPROM retains dose history and calibration even after battery replacement - meeting IEC 62304 Class C requirements. |
| Smart Energy Meter | Automotive Body Control Module (BCM) |
|
Use Scenario: Revenue-grade meter operates from split-phase AC with isolated DC-DC converter; subject to transient surges and brownouts during grid switching. IC Role / Device Role / Timing Role: X4163S8-4.5A monitors 5 V rail and asserts RESET/RESET within 10 µs of VCC dropping below 4.5 V, halting metering calculations until stable. Use Value: Guarantees accurate kWh accumulation by preventing partial writes to EEPROM during power interruption - eliminating data corruption risk. |
Use Scenario: BCM manages door locks, lighting, and window motors in 12 V automotive systems with wide input range (6–16 V) and load-dump transients. IC Role / Device Role / Timing Role: X4163S8-4.5A serves as secondary supervisor alongside primary PMIC; its 4.5 V threshold aligns with CAN transceiver min VCC spec. Use Value: Enables coordinated reset sequencing between MCU and CAN PHY; EEPROM stores user preferences (e.g., mirror position) retained across ignition cycles. |
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 |
|---|---|---|---|
| MAX6361KA45+T | Fixed 4.5 V reset threshold; no programmable VTRIP; 1 Kbit EEPROM; 100 kHz I²C only. | Lacks VTRIP fine-tuning and higher-speed interface; suitable only where EEPROM size and speed are secondary. | Choose MAX6361KA45+T for cost-sensitive designs with static 4.5 V reset needs and no field calibration requirement. |
| STM8AF6266TCY | MCU-based solution with integrated 2 Kbyte EEPROM and configurable reset logic; requires firmware development. | Offers flexible reset timing and watchdog behavior but adds software validation burden and increases design cycle time. | Choose STM8AF6266TCY only when application demands custom reset sequencing or dynamic threshold adjustment beyond X4163S8-4.5A's capabilities. |
Compared with MAX6361KA45+T and STM8AF6266TCY, the X4163S8-4.5A uniquely combines factory-trimmed 4.5 V reset accuracy, field-reprogrammable VTRIP, 16 Kbit EEPROM, and 400 kHz I²C in a pin-compatible 8-SOIC footprint - delivering verified reliability without firmware overhead or speed compromise.
Availability
X4163S8-4.5A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for X4163S8-4.5A 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 Intersil in 2001 and later by Renesas Electronics in 2017.
The X4163/5 product line was designed to consolidate power-on reset, watchdog, voltage monitoring, and EEPROM into one die - targeting space-constrained embedded systems needing high reliability and minimal external components.
FAQ
What is the factory-programmed VTRIP threshold for X4163S8-4.5A?
The X4163S8-4.5A is shipped with a factory-programmed VTRIP threshold of 4.5 V ±150 mV. This value is laser-trimmed and remains stable over temperature and time. It can be reprogrammed to other voltages using the VP programming sequence described in the datasheet, but the default setting is precisely 4.5 V - confirmed in the device marking "S8-4.5A" where "4.5A" denotes the 4.5 V variant.
Does X4163S8-4.5A support I²C standard-mode or fast-mode timing?
X4163S8-4.5A supports standard-mode I²C operation up to 400 kHz, compliant with SMBus 2.0 electrical specifications. It does not support fast-mode (1 MHz) or high-speed mode. The SDA and SCL pins meet I²C open-drain requirements with 3 mA sink capability and 5.5 V absolute maximum rating, enabling direct connection to 3.3 V or 5 V masters without level shifters.
How is the watchdog timeout period selected on X4163S8-4.5A?
The watchdog timeout on X4163S8-4.5A is selected via two nonvolatile bits (WD1 and WD0) in the control register at address FFFFh. Valid combinations are: 00 = 1.4 s, 01 = 600 ms, 10 = 200 ms, and 11 = disabled (factory default). These bits retain their state across power cycles and can be modified only through the three-step write sequence involving WEL and RWEL latches.
Can X4163S8-4.5A's EEPROM be written to while the RESET/RESET output is active?
No - X4163S8-4.5A disables all serial communication and blocks new EEPROM write operations while RESET/RESET is asserted. This occurs during power-up, brownout (VCC < 4.5 V), or watchdog timeout. In-progress writes are allowed to complete, but no new commands are acknowledged, preventing data corruption during unstable supply conditions.
What package type is used for X4163S8-4.5A?
X4163S8-4.5A is supplied in an 8-lead SOIC package per JEDEC MS-012AC standard (150 mil width, 1.27 mm pitch). Pinout matches the generic X4163/5 family layout: S0, S1, RESET/RESET, VSS, SDA, SCL, WP, VCC. It is not offered in TSSOP or other variants under this specific part number - the "S8" suffix confirms SOIC packaging.
X4163S8-4.5A 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4163S8-4.5A FAQ
1.How can I place an order for X4163S8-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4163S8-4.5A 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 X4163S8-4.5A reliable?
The price and inventory of X4163S8-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4163S8-4.5A is usually 5 days.
3.What payment methods are accepted for X4163S8-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4163S8-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4163S8-4.5A?
X4163S8-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4163S8-4.5A 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 X4163S8-4.5A?
For technical support, including X4163S8-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4163S8-4.5A requirements.
6.How does Aetrix verify that X4163S8-4.5A is sourced from the original manufacturer or authorized distributors?
All X4163S8-4.5A 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 X4163S8-4.5A meets industry standards.
7.What is the process for return or replacement of X4163S8-4.5A?
All X4163S8-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X4163S8-4.5A, 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 X4163S8-4.5A part is unused and in its original packaging.
Return procedure for X4163S8-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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