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Renesas X4165PI-4.5A
- Part No.:
- X4165PI-4.5A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4165PI-4.5A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
X4165PI-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 provides selectable watchdog timeout (200 ms / 600 ms / 1.4 s), low-VCC reset assertion down to 1 V, and 400 kHz I²C-compatible 2-wire interface - used in embedded microcontroller systems for reliable boot sequencing and brownout protection.
For engineers reviewing the X4165PI-4.5A datasheet, X4165PI-4.5A pinout, X4165PI-4.5A application, or X4165PI-4.5A equivalent, key selection criteria include programmable VTRIP threshold (factory-set at 4.5 V), active-low/high RESET output with 250 ms timeout, EEPROM block-lock protection, and watchdog restart via SDA edge detection during SCL HIGH.
Technical Context
The X4165PI-4.5A implements a dual-mode reset generator with independent low-VCC detection and power-on reset timing, both asserting RESET/RESET until VCC exceeds the programmed trip point for 200 ms. Its watchdog circuit monitors SDA transitions only when SCL is HIGH, using nonvolatile WD1/WD0 bits to select timeout period without requiring external components.
EEPROM functionality includes 64-byte page write mode, self-timed 5 ms typical write cycle, and hardware/software write protection via WP pin, WPEN bit, and BP2–BP0 block lock configuration. The device operates across 2.7 V to 5.5 V and draws <1 µA standby current with watchdog disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP Threshold | Factory-programmed to 4.5 V ±100 mV; reprogrammable to custom voltage via VP pulse on WP pin |
| Reset Output Type | Active-low/open-drain RESET (X4165 variant); asserted for ≥250 ms after power-up or brownout |
| Watchdog Timeout | Selectable: 200 ms / 600 ms / 1.4 s (WD1/WD0 bits); disabled by default |
| EEPROM Capacity | 16 Kbit (2 K × 8), organized in 64-byte pages; supports byte and page write |
| I²C Interface Speed | Up to 400 kHz; compatible with standard 2-wire protocol; SDA/SCL pins support open-drain bus topology |
| Supply Voltage Range | 2.7 V to 5.5 V; reset remains valid down to VCC = 1 V |
| Standby Current | <1 µA with watchdog OFF; <20 µA with watchdog ON - enables battery-backed operation |
Pinout & Package
Package: 8-pin JEDEC SOIC (3.9 mm × 4.9 mm, 1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOIC) | S0 | Device select input; sets LSB of slave address (A0 = S0, A1 = S1) |
| 2 (SOIC) | S1 | Device select input; sets MSB of slave address; enables up to four devices on same bus |
| 3 (SOIC) | RESET/RESET | Active-low open-drain reset output; asserts during power-up, brownout, or watchdog timeout |
| 4 (SOIC) | VSS | Ground reference; must be connected to system common ground |
| 5 (SOIC) | SDA | Bidirectional serial data line; requires external pull-up; used for I²C communication and watchdog restart |
| 6 (SOIC) | SCL | Serial clock input; master-generated clock synchronizes all EEPROM and control register transfers |
| 7 (SOIC) | WP | Hardware write protect input; HIGH + WPEN bit enables permanent block lock protection |
| 8 (SOIC) | VCC | Power supply input; powers all internal circuits including reset generator, watchdog, and EEPROM |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set to 4.5 V; user-adjustable via nonvolatile programming sequence using VP pulse on WP pin |
| Watchdog Restart Logic | Triggered only by falling edge on SDA while SCL is HIGH - prevents false timeouts from noise or bus glitches |
| EEPROM Block Lock | Configurable protection of 64 B to full 2 KB array via BP2–BP0 bits; prevents accidental firmware/data overwrite |
| Power-Fail Immunity | RESET/RESET remains asserted until VCC rises above VTRIP for 200 ms - ensures clean processor restart after brownout recovery |
| Low-Power Supervision | <1 µA standby current with watchdog disabled - suitable for always-on monitoring in energy-constrained systems |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Microcontroller-based PLC executes cyclic control logic with firmware stored externally; power interruptions cause unpredictable state. IC Role / Device Role / Timing Role: X4165PI-4.5A provides power-on reset, brownout detection at 4.5 V, and watchdog supervision to force safe shutdown and reload on fault. Use Value: Prevents corrupted I/O state during undervoltage; ensures EEPROM-stored calibration data remains intact via block lock during field updates. |
Use Scenario: Portable ultrasound unit uses battery-backed MCU with critical boot firmware and patient calibration tables. IC Role / Device Role / Timing Role: X4165PI-4.5A monitors VCC during battery discharge, asserts RESET before analog front-end fails, and guards against software lockup via 600 ms watchdog. Use Value: Guarantees deterministic boot sequence and preserves EEPROM integrity under low-power conditions with <1 µA standby draw. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: BCM manages door locks, lighting, and CAN gateway; subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: X4165PI-4.5A delivers robust reset signaling down to 1 V and holds RESET for 250 ms post-stabilization to prevent premature MCU execution. Use Value: Eliminates need for discrete reset IC + EEPROM; reduces BOM count and PCB area while meeting AEC-Q100 stress requirements. |
Use Scenario: Revenue-grade meter stores tariff schedules and usage logs in EEPROM; must survive grid sags and capacitor discharge events. IC Role / Device Role / Timing Role: X4165PI-4.5A detects VCC drop below 4.5 V, freezes EEPROM writes, and asserts RESET to halt计量 processing until stable supply returns. Use Value: Ensures atomic write completion and prevents partial record corruption during power loss via built-in write protection and reset hold timing. |
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 VTRIP programmability; 1 Kbit EEPROM; no watchdog timer | Limited to fixed-threshold brownout detection; lacks configurable supervision and memory size | Choose when only basic reset + small EEPROM is needed and VTRIP tuning is unnecessary |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2 Kbyte flash; 128-byte EEPROM; programmable reset delay but no external I²C EEPROM interface | Replaces discrete supervisor + MCU; not drop-in compatible; requires firmware redesign | Choose for cost-sensitive designs where adding MCU intelligence justifies architecture change |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4165PI-4.5A uniquely combines field-programmable VTRIP, multi-interval watchdog, and 16 Kbit EEPROM in a pin-compatible 8-SOIC footprint - enabling precise voltage margining, robust fault recovery, and scalable nonvolatile storage without MCU intervention.
Availability
X4165PI-4.5A 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-term lifecycle support.
Supply support for X4165PI-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 Inc., acquired by Renesas Electronics in 2008, specialized in nonvolatile memory and power management ICs for embedded systems.
The X4163/5 family was designed to consolidate reset, watchdog, voltage monitoring, and EEPROM functions into a single chip - reducing board space and improving reliability in resource-constrained microcontroller applications.
FAQ
What is the factory-set VTRIP voltage for X4165PI-4.5A?
The X4165PI-4.5A is shipped with a factory-programmed VTRIP threshold of 4.5 V ±100 mV. This value is stored nonvolatily and remains stable over temperature and time unless reprogrammed using the VP pulse method on the WP pin. The 4.5 V setting targets systems powered from nominal 5 V rails where brownout detection must occur before logic-level degradation.
How does the watchdog timer in X4165PI-4.5A get reset?
The X4165PI-4.5A watchdog timer resets only on a HIGH-to-LOW transition of the SDA pin while SCL is held HIGH - matching the I²C start condition. This design prevents spurious resets from noise or floating bus states. If no valid edge occurs within the selected timeout (200 ms / 600 ms / 1.4 s), RESET/RESET activates. The timeout is set via nonvolatile WD1/WD0 bits in the control register.
Can X4165PI-4.5A's EEPROM be written while RESET/RESET is active?
No. While RESET/RESET is active - whether due to power-up, brownout, or watchdog timeout - all I²C communication is blocked and no EEPROM write operations can initiate. In-progress writes are allowed to complete, but new commands are ignored. This ensures data integrity during unstable supply conditions and prevents partial writes that could corrupt firmware or calibration data stored in the X4165PI-4.5A's 16 Kbit EEPROM array.
What package type is used for X4165PI-4.5A?
The X4165PI-4.5A is supplied in an 8-pin JEDEC-standard SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch). This footprint is identical to the 8-pin TSSOP variant (X4165PT-4.5A) but differs in thermal and mechanical characteristics. The SOIC version offers higher moisture sensitivity level (MSL-1) and is preferred for reflow-soldered industrial assemblies requiring long-term reliability.
Does X4165PI-4.5A support I²C multi-master bus configurations?
Yes. The X4165PI-4.5A operates as a standard I²C slave device with open-drain SDA/SCL pins and supports arbitration per I²C specification. Its 400 kHz maximum clock rate, ACK polling capability, and lack of internal bus contention enable seamless integration into multi-master systems - such as those combining an application MCU and a service processor sharing the same EEPROM for configuration storage in the X4165PI-4.5A.
X4165PI-4.5A 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:
- 4.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
X4165PI-4.5A FAQ
1.How can I place an order for X4165PI-4.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4165PI-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 X4165PI-4.5A reliable?
The price and inventory of X4165PI-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 X4165PI-4.5A is usually 5 days.
3.What payment methods are accepted for X4165PI-4.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4165PI-4.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4165PI-4.5A?
X4165PI-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4165PI-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 X4165PI-4.5A?
For technical support, including X4165PI-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4165PI-4.5A requirements.
6.How does Aetrix verify that X4165PI-4.5A is sourced from the original manufacturer or authorized distributors?
All X4165PI-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 X4165PI-4.5A meets industry standards.
7.What is the process for return or replacement of X4165PI-4.5A?
All X4165PI-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X4165PI-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 X4165PI-4.5A part is unused and in its original packaging.
Return procedure for X4165PI-4.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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