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Renesas X4165P-2.7
- Part No.:
- X4165P-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4165P-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,507
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Product details
Overview
X4165P-2.7 from Xicor (now part of Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 16K-bit 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 (2.63 V, 2.93 V, 4.0 V, 4.38 V), and operates from 2.7 V to 5.5 V - used in embedded microcontroller systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4165P-2.7 datasheet, X4165P-2.7 pinout, X4165P-2.7 application, or X4165P-2.7 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 write protection using WP pin + WPEN bit.
Technical Context
The X4165P-2.7 implements a dedicated low-voltage detection circuit with hysteresis and 250 ms reset timeout after VCC recovery; its watchdog timer monitors SDA transitions during SCL HIGH to detect microcontroller lockup. The device uses a volatile WEL latch and nonvolatile control register (at FFFFh) to configure block lock (BP2–BP0) and watchdog bits (WD1, WD0).
EEPROM functionality includes 64-byte page write mode with self-timed 5 ms typical write cycle, built-in power-up/power-down write inhibition, and Block Lock protection covering first 64 B to full 2 KB array. All communications follow standard I²C protocol with start/stop conditions, ACK polling support, and slave address format 1010-S1-S0-R/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic systems without level shifting. |
| Reset Threshold (VTRIP) | 2.63 V (standard for X4165P-2.7) - asserts RESET/RESET below this level; valid down to VCC = 1 V. |
| Watchdog Timeout Options | 200 ms / 600 ms / 1.4 s - selected via nonvolatile WD1/WD0 bits; disabled by default (WD1=WD0=1). |
| EEPROM Capacity | 16 Kbits (2 K × 8) - organized as 256 pages of 64 bytes; enables firmware parameter storage and calibration data retention. |
| I²C Interface Speed | 400 kHz maximum - compatible with standard-mode Fast-mode I²C buses; supports multi-master arbitration. |
| Standby Current | <1 µA (watchdog OFF) - enables ultra-low-power operation in battery-backed systems. |
| Reset Pulse Width (tPURST) | 250 ms minimum after power-up - ensures stable VCC and oscillator startup before processor release. |
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 (1010-S1-S0-R/W); tied LOW or HIGH to select one of four devices on same bus. |
| 2 (SOIC) | S1 | Device select input - sets MSB of I²C slave address; enables up to four X4165P-2.7 units on shared SDA/SCL lines. |
| 3 (SOIC) | RESET/RESET | Active-low open-drain reset output - asserted during power-up, brownout (<2.63 V), or watchdog timeout; requires external pull-up. |
| 4 (SOIC) | VSS | Ground reference - common return path for reset logic, EEPROM, and interface circuitry. |
| 5 (SOIC) | SDA | Serial data bidirectional I/O - open-drain, requires pull-up; carries I²C data and serves as watchdog trigger (falling edge while SCL HIGH resets timer). |
| 6 (SOIC) | SCL | Serial clock input - synchronous timing signal for I²C read/write operations; also used in watchdog state detection. |
| 7 (SOIC) | WP | Write protect input - when HIGH and WPEN bit set, blocks all writes to protected EEPROM blocks and control register. |
| 8 (SOIC) | VCC | Positive supply - powers all internal circuits; voltage level determines VTRIP behavior and enables VTRIP reprogramming at specific VCC values. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP threshold | Factory-set to 2.63 V but reprogrammable to custom value (e.g., 2.7 V) using on-chip sequence with VP = 12–15 V on WP pin - eliminates need for external voltage dividers or trim pots. |
| Hardware + software write protection | Combines WP pin + WPEN bit (hardware lock) with BP2–BP0 block lock bits (software-configurable 64 B to 2 KB protection) - prevents accidental overwrites during field updates or debug sessions. |
| Self-timed EEPROM write | 5 ms typical internal write cycle with automatic completion detection via ACK polling - simplifies host firmware by removing fixed delay requirements. |
| Dual-role RESET/RESET output | Single pin provides both power-on reset and brownout/wdog-triggered reset with 250 ms minimum assertion time - reduces board space vs. discrete reset + watchdog ICs. |
| Low-power standby mode | <1 µA current draw with watchdog disabled - extends battery life in portable or energy-harvesting applications where supervisor remains powered continuously. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Microcontroller-based PLC unit must retain calibration constants and fault logs across frequent AC power cycles and brownouts. IC Role / Device Role / Timing Role: X4165P-2.7 acts as system-level supervisor: asserting RESET/RESET during undervoltage, logging error codes to EEPROM, and enabling watchdog recovery from firmware hangs. Use Value: Prevents corrupted EEPROM writes during power collapse via built-in power-fail write inhibit and ensures deterministic reset timing (250 ms) for safe state restoration. |
Use Scenario: Battery-powered infusion pump requires fail-safe restart after voltage sag caused by motor startup or low battery. IC Role / Device Role / Timing Role: X4165P-2.7 monitors VCC and triggers immediate reset if drops below 2.63 V; stores dosage history in EEPROM with hardware write lock to prevent tampering. Use Value: Guarantees <1 µA quiescent current in standby - extending single-cell Li-ion runtime beyond 6 months - while maintaining certified reset reliability per IEC 62304. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: BCM must survive load-dump transients and cold-crank voltage dips while preserving configuration settings. IC Role / Device Role / Timing Role: X4165P-2.7 provides brownout reset (2.63 V threshold), watchdog supervision of MCU firmware, and stores door/window position memory in EEPROM. Use Value: Reset remains valid down to VCC = 1 V - ensuring controlled shutdown even during severe cranking events - and Block Lock protects critical NV parameters from overwrite. |
Use Scenario: Utility meter retains tariff schedules and consumption logs across grid outages and capacitor backup discharge. IC Role / Device Role / Timing Role: X4165P-2.7 supervises MCU power rail, initiates graceful shutdown on brownout, and stores billing data in EEPROM with 100K write-cycle endurance. Use Value: 64-byte page write mode enables atomic updates of multi-byte tariff tables; ACK polling allows precise timing of write completion without fixed delays. |
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 K × 8 EEPROM (8 Kbit); 100 kHz I²C only. | Lacks adjustable threshold and higher-speed interface - suitable only where 2.93 V trip is acceptable and bandwidth <100 kHz suffices. | Select when cost sensitivity outweighs configurability needs and EEPROM size <16 Kbit is sufficient. |
| STM8S105K4T6C | MCU with embedded 2 Kbytes EEPROM and reset/watchdog peripherals - requires firmware development; no standalone supervisor function. | Replaces discrete supervisor + MCU architecture - adds design complexity but enables custom reset logic and dynamic threshold adjustment in code. | Choose when system already uses STM8 and firmware resources allow integration of supervisor functions into application code. |
Compared with MAX6361KA29+T and STM8S105K4T6C, the X4165P-2.7 uniquely combines field-programmable VTRIP, 400 kHz I²C, and 16 Kbit EEPROM in a pin-compatible 8-SOIC footprint - delivering drop-in upgrade path for legacy X4163/X4165 designs without layout changes or firmware modification.
Availability
X4165P-2.7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for X4165P-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 Inc. was a fabless semiconductor company specializing in nonvolatile memory and power management ICs, acquired by Renesas Electronics in 2008. Its products emphasize high reliability and analog-mixed-signal integration.
The X4163/5 family was designed specifically for embedded systems needing consolidated power supervision, watchdog safety, and EEPROM data retention - targeting cost-sensitive, space-constrained applications where discrete solutions increase BOM count and failure risk.
FAQ
What is the factory-default VTRIP threshold for X4165P-2.7?
The X4165P-2.7 ships with a factory-programmed VTRIP threshold of 2.63 V, optimized for 2.7 V nominal supply systems. This value is stored nonvolatively and remains stable across temperature and operating life unless reprogrammed using the documented VP-assisted sequence on the WP pin.
Does X4165P-2.7 support I²C standard-mode (100 kHz) and fast-mode (400 kHz)?
Yes, X4165P-2.7 fully supports I²C fast-mode operation up to 400 kHz, as confirmed in the "Features" section and timing diagrams of the datasheet. It is backward-compatible with standard-mode (100 kHz) buses and handles clock stretching, ACK polling, and multi-master arbitration per I²C specification.
How does the watchdog timer in X4165P-2.7 get reset during normal operation?
The X4165P-2.7 watchdog timer is reset by a falling edge on the SDA pin while SCL is held HIGH - matching the I²C START condition. This design allows the host MCU to service the watchdog using standard I²C bus activity without requiring dedicated GPIO toggling or additional timing logic.
Can X4165P-2.7's EEPROM be written to while RESET/RESET is active?
No. While RESET/RESET is asserted - whether due to power-up, brownout, or watchdog timeout - all EEPROM write operations are inhibited. The device terminates ongoing communications and blocks new write commands until RESET/RESET deasserts, preventing data corruption during unstable power conditions.
What package options are available for X4165P-2.7, and is the pinout identical between them?
X4165P-2.7 is offered in 8-lead SOIC and 8-lead TSSOP packages. Both share identical pin numbering and function mapping per the datasheet's "PIN CONFIGURATION" diagrams - enabling direct PCB footprint interchangeability without redesign, provided thermal and mechanical constraints permit TSSOP use.
X4165P-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
X4165P-2.7 FAQ
1.How can I place an order for X4165P-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4165P-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 X4165P-2.7 reliable?
The price and inventory of X4165P-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 X4165P-2.7 is usually 5 days.
3.What payment methods are accepted for X4165P-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4165P-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4165P-2.7?
X4165P-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4165P-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 X4165P-2.7?
For technical support, including X4165P-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4165P-2.7 requirements.
6.How does Aetrix verify that X4165P-2.7 is sourced from the original manufacturer or authorized distributors?
All X4165P-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 X4165P-2.7 meets industry standards.
7.What is the process for return or replacement of X4165P-2.7?
All X4165P-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4165P-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 X4165P-2.7 part is unused and in its original packaging.
Return procedure for X4165P-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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