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onsemi CAT1320WI-25
- Part No.:
- CAT1320WI-25
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CAT1320WI-25.pdf
- Description:
- CAT1320 - SUPERVISORY CIRCUIT WI
- Quantity:
- Payment:
- Shipping:
Inventory:547
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Product details
Overview
CAT1320WI-25 from Catalyst Semiconductor is an integrated supervisory circuit with 32kbit I²C EEPROM, providing precision power supply monitoring and active-low reset for microcontroller systems. It supports 2.55V–2.70V reset threshold, operates from 3.0V to 5.5V, guarantees valid reset down to VCC = 1V, and features 400kHz I²C interface with 64-byte page write buffer.
For engineers reviewing the CAT1320WI-25 datasheet, pinout, applications, or equivalent options, this device serves as a single-chip solution for brown-out protection and nonvolatile configuration storage in industrial embedded controllers, where deterministic reset timing and EEPROM data integrity under voltage transients are critical.
Technical Context
The CAT1320WI-25 integrates a precision voltage monitor with comparator-based threshold detection and an open-drain active-low RESET output, coupled with a 32kbit (4K × 8) serial EEPROM compliant with standard I²C protocol. Its reset logic guarantees minimum 200ms timeout after VCC exceeds threshold and remains valid down to 1.0V.
EEPROM operation includes hardware write protection triggered by VCC < reset threshold, 1,000,000 program/erase cycles, and 100-year data retention. The device uses low-power CMOS technology and supports manual reset via edge-triggered RESET pin input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V to 2.70V - precisely targets 2.7V systems with ±3.7% tolerance, enabling reliable brown-out detection before MCU malfunction. |
| Reset Output Type | Active-low open-drain - requires external pull-up; allows wired-OR reset bus and manual reset input via falling-edge trigger. |
| I²C Interface Speed | 400kHz - supports fast configuration read/write without requiring high-speed MCU peripherals or additional clock resources. |
| EEPROM Capacity | 32kbit (4096 × 8) - stores full bootloader parameters, calibration data, or device identity in one package, eliminating discrete memory. |
| Write Endurance | 1,000,000 cycles - enables daily firmware update logging or runtime parameter tuning over 27+ years at 100 writes/day. |
| Data Retention | 100 years - ensures factory calibration constants and security keys remain intact across product lifetime without refresh. |
| Operating Voltage | 3.0V to 5.5V - interoperates with both 3.3V and 5V logic domains, simplifying mixed-voltage board design. |
Pinout & Package
Package: 8-pin SOIC (JEDEC MS-012, lead-free/halogen-free), body size 4.9mm × 3.9mm × 1.75mm, thermal pad optional, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Device Address Inputs | Hardwired address bits allowing up to eight CAT1320WI-25 devices on same I²C bus; unconnected = logic 0. |
| VCC | Power Supply Input | Primary supply rail (3.0–5.5V); powers both supervisor and EEPROM; also feeds internal voltage reference. |
| RESET | Active-Low Reset I/O | Open-drain output asserting low during brown-out; accepts falling-edge manual reset input; requires external pull-up. |
| SCL | I²C Clock Input | CMOS-compatible input accepting standard I²C clock; synchronizes all EEPROM read/write transfers. |
| SDA | I²C Data I/O | Open-drain bidirectional line for address/data transfer; supports multi-master arbitration and ACK polling. |
| VSS | Ground Reference | System ground return for both supervisor logic and EEPROM core; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset at VCC = 1V | Ensures fail-safe system halt even during deep brown-out or battery sag, preventing corrupted EEPROM writes or MCU lockup. |
| Hardware Write Protection | Automatically disables EEPROM writes when VCC drops below reset threshold or during power-up until stable, eliminating need for software safeguards. |
| 64-Byte Page Write Buffer | Reduces I²C transaction overhead by 64× vs. byte-write mode, cutting firmware update time from seconds to milliseconds. |
| Industrial Temperature Range | Operates reliably from –40°C to +85°C, supporting deployment in motor drives, PLCs, and outdoor metering without derating. |
| Glitch Immunity | Rejects VCC transients <100ns, preventing spurious resets from EMI or switching noise in noisy industrial environments. |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Stores calibration coefficients, tariff schedules, and event logs in utility-grade meters exposed to wide temperature swings and grid voltage sags. IC Role / Device Role / Timing Role: Supervisory IC providing brown-out reset and nonvolatile storage; reset asserts within 10µs of VCC drop below 2.55V. Use Value: Prevents EEPROM corruption during 100ms grid dips and retains 10+ years of tamper-proof consumption history without backup capacitor. |
Use Scenario: Configures analog front-end gain, phase compensation, and firmware version in programmable logic controller modules. IC Role / Device Role / Timing Role: Dual-function IC acting as power monitor and configuration memory; RESET output holds CPU in reset until VCC stabilizes >2.70V for ≥200ms. Use Value: Eliminates separate reset IC and EEPROM, reducing BOM count by two components and PCB area by 22 mm². |
| Medical Diagnostic Handheld | Automotive Body Control Module |
Use Scenario: Saves user preferences, sensor offsets, and diagnostic fault codes in portable ultrasound or glucose monitors with coin-cell backup. IC Role / Device Role / Timing Role: System supervisor ensuring safe shutdown and EEPROM write completion before power loss; supports manual reset via tactile switch. Use Value: Enables reliable "last known good state" recovery after battery replacement, meeting IEC 62304 Class B software safety requirements. |
Use Scenario: Stores door lock actuator calibration, window position limits, and anti-pinch thresholds in 12V automotive subsystems. IC Role / Device Role / Timing Role: Power integrity guardian and configuration store; withstands load-dump transients and cold-crank voltage drops to 6V. Use Value: Maintains functional safety by guaranteeing EEPROM writes complete before reset deasserts, avoiding inconsistent actuator behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory + EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA25+T | Single 2.5V reset threshold (±2.5%), no EEPROM; requires external I²C memory. | Lacks integrated memory - increases BOM, layout complexity, and failure points in space-constrained designs. | Choose when only reset functionality is needed and EEPROM is already present elsewhere on bus. |
| STM8AF6266TCY | 8-bit automotive MCU with 32KB Flash, 2KB RAM, and built-in reset logic - no dedicated EEPROM; relies on Flash wear-leveling. | Requires firmware development for EEPROM emulation; lacks guaranteed 100-year retention and 1M-cycle endurance. | Prefer when system needs local processing and can tolerate Flash-based NVM trade-offs in cost-sensitive automotive Tier 2 modules. |
Compared with MAX6361KA25+T and STM8AF6266TCY, CAT1320WI-25 delivers verified 1M-cycle EEPROM endurance and hardware write protection in a single 8-pin SOIC, reducing validation effort for safety-critical data logging while eliminating software EEPROM emulation overhead.
Availability
CAT1320WI-25 is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, medical handhelds, and automotive body control modules requiring stable component supply with long-term lifecycle assurance.
Supply support for CAT1320WI-25 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
Catalyst Semiconductor was a fabless analog/mixed-signal IC designer focused on power management and memory interface solutions before acquisition by ON Semiconductor in 2010; its legacy products remain widely deployed in industrial infrastructure.
CAT1320WI-25 belongs to the CAT1320 supervisory + EEPROM family, engineered specifically for microcontroller-based systems needing deterministic power-on reset behavior and robust nonvolatile storage without firmware intervention.
FAQ
What is the exact reset threshold voltage range for CAT1320WI-25?
The CAT1320WI-25 has a factory-trimmed reset threshold of 2.55V to 2.70V, corresponding to the "-25" suffix per Catalyst's ordering nomenclature. This range is specified at TA = –40°C to +85°C and guarantees monotonic reset assertion across temperature and supply variation without requiring external resistor networks.
Does CAT1320WI-25 support manual reset functionality?
Yes, CAT1320WI-25 supports manual reset via its RESET pin, which functions as both active-low open-drain output and edge-triggered input. A falling edge on RESET initiates a 200ms reset timeout, enabling push-button recovery without additional logic - a feature confirmed in the "Manual Reset Operation" section of Doc. No. 25085.
Can CAT1320WI-25 operate reliably at 3.0V supply voltage?
Yes, CAT1320WI-25 is fully specified for operation from 3.0V to 5.5V. At VCC = 3.0V, it maintains 400kHz I²C communication, valid reset output down to 1.0V, and EEPROM write capability - all verified in DC and AC operating characteristics tables of the official datasheet.
What is the maximum I²C clock frequency supported by CAT1320WI-25?
CAT1320WI-25 supports standard-mode I²C up to 400kHz, as explicitly stated in the FEATURES section and confirmed in AC Characteristics tables. It does not support fast-mode plus (1MHz) or high-speed mode; timing parameters like tLOW, tHIGH, and tBUF are characterized only at ≤400kHz.
How does hardware write protection work in CAT1320WI-25?
In CAT1320WI-25, hardware write protection is enabled automatically whenever VCC falls below the reset threshold or has not yet risen above it during power-up. This blocks all EEPROM write commands at the silicon level - no software command or I²C transaction can override it, ensuring data integrity during unstable supply conditions.
CAT1320WI-25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.55V, 2.7V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CAT1320WI-25 FAQ
1.How can I place an order for CAT1320WI-25 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT1320WI-25 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 CAT1320WI-25 reliable?
The price and inventory of CAT1320WI-25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT1320WI-25 is usually 5 days.
3.What payment methods are accepted for CAT1320WI-25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1320WI-25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT1320WI-25?
CAT1320WI-25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT1320WI-25 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 CAT1320WI-25?
For technical support, including CAT1320WI-25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1320WI-25 requirements.
6.How does Aetrix verify that CAT1320WI-25 is sourced from the original manufacturer or authorized distributors?
All CAT1320WI-25 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 CAT1320WI-25 meets industry standards.
7.What is the process for return or replacement of CAT1320WI-25?
All CAT1320WI-25 units undergo pre-shipment inspection (PSI). If there is an issue with CAT1320WI-25, 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 CAT1320WI-25 part is unused and in its original packaging.
Return procedure for CAT1320WI-25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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