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Renesas X4163V8-2.7
- Part No.:
- X4163V8-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
X4163V8-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,060
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Product details
Overview
X4163V8-2.7 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-lead SOIC package. It features a factory-default 2.7 V reset threshold, 400 kHz I²C interface, <1 µA standby current with watchdog disabled, and 5 ms typical EEPROM write cycle time. It is used in embedded microcontroller systems requiring reliable power sequencing and nonvolatile configuration storage.
For engineers reviewing the X4163V8-2.7 datasheet, X4163V8-2.7 pinout, X4163V8-2.7 application, or X4163V8-2.7 equivalent, key selection criteria include programmable VTRIP threshold, block-lock EEPROM protection, watchdog timeout configurability (200 ms / 600 ms / 1.4 s), and dual active-reset output polarity support (X4163 variant).
Technical Context
The X4163V8-2.7 implements a dual-function reset architecture: a power-on reset circuit holding RESET active for 250 ms after VCC stabilization, and a low-VCC detector asserting RESET when VCC falls below the programmed 2.7 V threshold - with reset release delayed 200 ms after VCC recovery. Its watchdog timer monitors SDA transitions during SCL HIGH to detect MCU lockup.
EEPROM operation uses a 64-byte page-write mode with self-timed internal write cycles; write enable requires a three-step volatile latch sequence (WEL → RWEL → control byte). Block Lock protection is configurable via nonvolatile BP2–BP0 bits to protect 64–2048 bytes or full array, and hardware write protection engages when WP = HIGH and WPEN = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.7 V nominal; factory-set and reprogrammable via VP pulse on WP pin to ±50 mV precision |
| Watchdog Timeout | Selectable: 200 ms, 600 ms, or 1.4 s; configured by nonvolatile WD1/WD0 bits in control register |
| EEPROM Capacity | 16 Kbit (2 K × 8); organized as 32 pages of 64 bytes each; supports byte and page writes |
| I²C Interface Speed | 400 kHz maximum; compatible with standard-mode and fast-mode I²C buses |
| Supply Voltage Range | 2.7 V to 5.5 V; operates down to 1 V during reset assertion for brownout robustness |
| Standby Current | <1 µA with watchdog disabled; <20 µA with watchdog enabled - critical for battery-backed systems |
| Reset Pulse Width | 250 ms minimum after power-up; 200 ms minimum hold time after VCC recovery from brownout |
Pinout & Package
Package: 8-lead JEDEC SOIC (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input; sets LSB of I²C slave address (A0 bit) |
| 2 (SOIC) | S1 | Device select input; sets MSB of I²C slave address (A1 bit) |
| 3 (SOIC) | RESET/RESET | Active-low open-drain reset output; asserted on power-up, brownout, or watchdog timeout |
| 4 (SOIC) | VSS | Ground reference; must be connected to system GND for proper reset timing and EEPROM operation |
| 5 (SOIC) | SDA | Bidirectional I²C data line; open-drain; requires external pull-up; also serves as watchdog trigger input |
| 6 (SOIC) | SCL | I²C clock input; controls all serial data transfers and watchdog sampling timing |
| 7 (SOIC) | WP | Hardware write protect input; enables permanent block lock when WP = HIGH and WPEN = 1 |
| 8 (SOIC) | VCC | Power supply input; powers all internal circuits including reset generator, watchdog, and EEPROM core |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Reset Threshold | VTRIP adjustable from 1.7 V to 4.9 V in ~50 mV steps using VP pulse on WP pin - eliminates external resistor networks |
| Configurable Watchdog Timer | Three discrete timeout options (200/600/1400 ms) stored in nonvolatile control register - survives power cycles without reconfiguration |
| Block Lock EEPROM Protection | Five protection modes (none, first 64/128/256/512 bytes, or full 2 KB array) controlled by BP2–BP0 bits - prevents firmware corruption during field updates |
| Hardware Write Protect | WP pin + WPEN bit enable irreversible hardware lock - blocks all writes to protected memory and control register until WP pulled LOW |
| Low-Voltage Reset Validity | RESET remains asserted down to VCC = 1 V - ensures deterministic behavior during deep brownout conditions |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 3.3 V supply rail and detects MCU hang during safety-critical infusion delivery sequences. IC Role / Device Role / Timing Role: Dual-role supervisor: provides 250 ms power-on reset for FPGA configuration, then asserts RESET if VCC drops below 2.7 V or watchdog expires. Use Value: Prevents unintended motor actuation by guaranteeing MCU reset before code execution and during brownout - meets IEC 62304 Class C requirements. |
Use Scenario: Stores calibration coefficients and usage logs in EEPROM while supervising ARM Cortex-M0+ controller. IC Role / Device Role / Timing Role: Combines nonvolatile storage and fail-safe reset: EEPROM retains data across 100k+ cycles; RESET holds processor in reset until 200 ms post-brownout recovery. Use Value: Eliminates need for separate reset IC + EEPROM, reducing BOM count and PCB area by 35% in space-constrained handheld enclosure. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Logs tamper events and tariff schedules in EEPROM while monitoring 5 V DC-DC output under wide temperature range. IC Role / Device Role / Timing Role: Voltage supervisor with programmable 2.7 V trip point; watchdog restarts on SDA edge to confirm MCU liveness every 600 ms. Use Value: Enables accurate energy billing during grid fluctuations - reset remains valid down to 1 V, ensuring meter state integrity during 100 ms dips. |
Use Scenario: Supervises 12 V → 5 V regulator powering CAN transceiver and microcontroller in door module. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection at 2.7 V threshold; EEPROM stores window position and mirror angle calibration. Use Value: Supports AEC-Q100 Grade 2 qualification via robust reset timing (250 ms POR, 200 ms release delay) and 100 kcycle EEPROM endurance. |
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 |
|---|---|---|---|
| MAX6361KA27-T | Fixed 2.7 V reset only; no VTRIP programming; 1 Kbit EEPROM; 100 kHz I²C max | Lacks field-adjustable threshold and higher-speed interface - suitable only for cost-sensitive, static-voltage designs | Choose when design requires lowest unit cost and does not require VTRIP tuning or >100 kHz EEPROM access. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2 Kbyte EEPROM; fixed 2.93 V reset; no external watchdog input | Replaces discrete supervisor + MCU but adds firmware development overhead and lacks SDA-triggered watchdog | Choose only when adding local decision logic (e.g., adaptive reset delay) justifies MCU integration and software validation effort. |
Compared with X4163V8-2.7, MAX6361KA27-T offers lower cost but sacrifices programmability and speed, while STM8T142M2U6 embeds intelligence at the expense of design simplicity and watchdog responsiveness - X4163V8-2.7 uniquely balances field-configurable supervision with proven EEPROM reliability in one die.
Availability
X4163V8-2.7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, automotive body control modules, and battery-powered IoT gateways requiring stable component supply across extended product lifecycles.
Supply support for X4163V8-2.7 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 and EEPROM integration.
The X4163/5 family was designed for embedded systems needing consolidated power monitoring, reset generation, and configuration storage - targeting applications where board space, BOM count, and field-programmable voltage thresholds are critical constraints.
FAQ
What is the default reset threshold voltage for the X4163V8-2.7?
The X4163V8-2.7 ships with a factory-programmed reset threshold of 2.7 V nominal. This value is stored in nonvolatile circuitry and remains stable over temperature and time. It can be reprogrammed to other thresholds between 1.7 V and 4.9 V using the VP pulse method on the WP pin, as detailed in the device's VTRIP programming sequence.
Does the X4163V8-2.7 support both active-high and active-low reset outputs?
No - the X4163V8-2.7 provides only an active-low open-drain RESET output (pin 3). The "RESET/RESET" naming reflects its functional equivalence to industry-standard active-low reset signals. It does not offer an active-high variant; that functionality is implemented in the pin-compatible X4165 series, not the X4163V8-2.7.
How many bytes can be written in a single page write operation to the X4163V8-2.7 EEPROM?
The X4163V8-2.7 supports 64-byte page writes. Each page spans 64 consecutive addresses (e.g., 0x0000–0x003F), and the internal address counter wraps within the page boundary. Writing beyond the page end overwrites earlier bytes in the same page - for example, writing 70 bytes starting at offset 60 writes bytes 60–63, then 0–5, overwriting prior content at those locations.
Can the watchdog timer on the X4163V8-2.7 be disabled after power-up?
Yes - the watchdog timer on the X4163V8-2.7 can be permanently disabled by setting WD1 = 1 and WD0 = 1 in the nonvolatile control register (address FFFFh). This configuration persists across power cycles. Disabling requires the three-step write sequence (WEL → RWEL → control byte) and is irreversible unless re-enabled via the same procedure.
Is the X4163V8-2.7 pin-compatible with other devices in the X4163/5 family?
Yes - the X4163V8-2.7 shares identical 8-pin SOIC pinout and electrical characteristics with all X4163/5 variants (e.g., X4163V8-3.0, X4163V8-4.4, X4165 series). Differences are limited to factory-set VTRIP values and reset output polarity (X4165 = active-high). No PCB layout change is required when substituting within the same variant group (X4163).
X4163V8-2.7 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:
- 2.62V
- 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
X4163V8-2.7 FAQ
1.How can I place an order for X4163V8-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4163V8-2.7 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 X4163V8-2.7 reliable?
The price and inventory of X4163V8-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4163V8-2.7 is usually 5 days.
3.What payment methods are accepted for X4163V8-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4163V8-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4163V8-2.7?
X4163V8-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4163V8-2.7 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 X4163V8-2.7?
For technical support, including X4163V8-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4163V8-2.7 requirements.
6.How does Aetrix verify that X4163V8-2.7 is sourced from the original manufacturer or authorized distributors?
All X4163V8-2.7 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 X4163V8-2.7 meets industry standards.
7.What is the process for return or replacement of X4163V8-2.7?
All X4163V8-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4163V8-2.7, 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 X4163V8-2.7 part is unused and in its original packaging.
Return procedure for X4163V8-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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