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onsemi CAT1026YI-42
- Part No.:
- CAT1026YI-42
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CAT1026YI-42.pdf
- Description:
- CAT1026 - DUAL VOLTAGE SUPERVISO
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
CAT1026YI-42 from Catalyst Semiconductor is a dual-voltage supervisory IC with integrated 2k-bit I²C EEPROM, designed for microcontroller-based systems requiring brown-out protection and nonvolatile configuration storage. It features precision VCC monitoring with 4.25–4.50 V reset threshold, active-high and active-low open-drain RESET outputs, auxiliary VSENSE/VLOW monitoring down to 1.25 V, and operates from 3.0–5.5 V across –40°C to +85°C.
For engineers reviewing the CAT1026YI-42 datasheet, pinout, applications, or equivalent options, this device serves as a system power supervisor and serial memory solution in embedded controllers where simultaneous reset signaling, voltage fault detection, and reliable data retention are critical.
Technical Context
The CAT1026YI-42 integrates two independent voltage comparators: one monitors VCC against a factory-trimmed 4.375 V nominal threshold (–42 variant), while the second compares VSENSE to an internal 1.25 V reference. Both drive open-drain outputs-RESET (active-high) and RESET (active-low)-with guaranteed validity down to VCC = 1.0 V and 200 ms reset timeout after VCC recovery.
Its embedded 2k-bit EEPROM supports 400 kHz I²C communication with 16-byte page write buffering, hardware write protection via VCC-sensed lockout, 1,000,000 program/erase cycles, and 100-year data retention. The device uses low-power CMOS technology and supports manual reset triggering via the bidirectional RESET pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.25–4.50 V (factory-set –42 option; ensures reliable reset assertion during 5 V supply brown-out) |
| I²C Bus Speed | 400 kHz (enables fast configuration reads/writes without CPU overhead in real-time systems) |
| EEPROM Capacity | 2 kbit (256 bytes; sufficient for bootloader flags, calibration data, or device identity storage) |
| Page Write Size | 16 bytes (reduces I²C transaction count and improves firmware update efficiency) |
| Operating Voltage | 3.0–5.5 V (supports both 3.3 V and 5 V logic domains without level-shifting) |
| Temperature Range | –40°C to +85°C (industrial-grade operation for automotive body control, industrial PLCs, and networking equipment) |
| Data Retention | 100 years (guarantees long-term storage of critical system parameters without refresh) |
Pinout & Package
Package: 8-pin TSSOP (U suffix), 3.0 mm × 4.4 mm footprint, 1.1 mm max height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Primary power supply input | Supplies core logic, EEPROM, and reset comparators; must be stable before reset deassertion |
| VSS | Ground reference | Common return path for all internal circuits; requires low-impedance connection to system ground plane |
| SCL | I²C clock input | Master-generated synchronous clock; open-drain compatible with standard I²C bus pull-up |
| SDA | I²C bidirectional data line | Open-drain interface for EEPROM read/write and status polling; shares bus with other I²C slaves |
| RESET | Active-high open-drain reset output | Drives high when VCC ≥ threshold; requires external pull-down resistor for proper logic level |
| RESET | Active-low open-drain reset output | Drives low when VCC < threshold; requires external pull-up resistor for clean signal termination |
| VSENSE | Auxiliary voltage monitor input | High-impedance comparator input; accepts externally divided supply to detect secondary rail faults |
| VLOW | Auxiliary voltage monitor output | Open-drain output asserted low when VSENSE < 1.25 V; can be wire-OR'd with RESET for combined fault response |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high and active-low signals simplify interfacing to diverse MCU reset inputs (e.g., ATmega vs. STM32) |
| VSENSE/VLOW auxiliary monitor | Enables detection of secondary supply failure (e.g., 1.8 V core rail) without adding discrete comparators |
| Hardware write protection | Automatic EEPROM lockout during power ramp-up/down prevents corruption during brown-out transitions |
| Manual reset capability | RESET pin doubles as edge-triggered input-allows push-button system reset without external circuitry |
| 16-byte page write buffer | Reduces I²C bus occupancy by up to 8× versus byte-write mode, improving system responsiveness during config updates |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring main 5 V supply and 3.3 V microcontroller core rail in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Dual-voltage supervisor providing synchronized reset assertion and EEPROM-backed parameter storage for I/O configuration and fault logs. Use Value: Prevents erratic behavior during line sags by asserting both RESET outputs within 10 µs of VCC drop below 4.25 V, while retaining last-known state in nonvolatile memory. |
Use Scenario: Supervising battery-backed 5 V domain and isolated 12 V-to-3.3 V converted rail in door module ECUs subject to load-dump transients. IC Role / Device Role / Timing Role: Primary power supervisor with auxiliary VSENSE monitoring of post-regulator rail; VLOW tied to MCU interrupt for predictive power-fail warning. Use Value: Enables graceful shutdown sequence initiation 5–10 ms before VCC collapse, using VLOW edge to trigger EEPROM save of window position and mirror angle. |
| Network Router Bootloader Storage | Medical Infusion Pump Calibration |
Use Scenario: Storing MAC address, firmware version, and network settings in enterprise-grade Ethernet switches with hot-swap power supplies. IC Role / Device Role / Timing Role: I²C EEPROM + supervisor co-located on main controller board; RESET outputs ensure clean boot after power-cycle events. Use Value: Guarantees bootloader integrity by disabling EEPROM writes until VCC stabilizes above 4.25 V, eliminating risk of corrupted MAC table during cold start. |
Use Scenario: Maintaining calibrated flow-rate coefficients and safety-critical alarm thresholds in Class II medical infusion pumps with dual-redundant power paths. IC Role / Device Role / Timing Role: Fault-tolerant memory and reset manager; VSENSE monitors backup lithium coin-cell voltage to preemptively flag battery depletion. Use Value: Achieves IEC 62304 compliance by logging 100+ pump cycles per EEPROM write and ensuring deterministic reset under 100 ms brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory + EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29D3+ | Single active-low reset output only; no active-high RESET; 2.93 V fixed threshold; same 2k EEPROM and I²C interface | Lacks dual-reset flexibility; requires external inverter for active-high MCU compatibility | Select when cost sensitivity outweighs need for dual-reset signaling and auxiliary voltage monitoring |
| TPS3808G33DBVR | Dedicated supervisor only (no EEPROM); 3.3 V threshold; includes watchdog timer; SOT-23-6 package | Requires external serial EEPROM for configuration storage; adds BOM count and layout complexity | Choose when higher reset accuracy (±0.5%) and watchdog functionality are prioritized over integrated memory |
Compared with MAX6361KA29D3+ and TPS3808G33DBVR, CAT1026YI-42 uniquely combines dual-reset signaling, auxiliary voltage monitoring, and embedded EEPROM in a single 8-pin TSSOP-reducing component count, PCB area, and qualification effort for space-constrained industrial designs.
Availability
CAT1026YI-42 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and network router bootloader storage requiring stable component supply, long-term data retention, and robust brown-out immunity.
Supply support for CAT1026YI-42 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 specializing in power management, supervisory, and nonvolatile memory solutions before its acquisition by ON Semiconductor in 2010.
The CAT1026 family was engineered to consolidate power supervision and configuration storage into one die-targeting cost-sensitive, reliability-critical embedded systems where discrete supervisors and EEPROMs previously increased bill-of-materials and failure modes.
FAQ
What is the exact reset threshold voltage range for CAT1026YI-42?
The CAT1026YI-42 has a factory-trimmed VCC reset threshold of 4.25 V minimum to 4.50 V maximum, with a typical value of 4.375 V. This range is specified in the "RESET Threshold Options" table of the CAT1026/CAT1027 datasheet (Doc No. 3010, Rev. K) and applies exclusively to the –42 suffix variant. The threshold remains stable across temperature and supply variations per DC operating characteristics.
Does CAT1026YI-42 support manual reset functionality?
Yes, CAT1026YI-42 supports manual reset via its bidirectional RESET pin. When driven low (high-to-low transition), it initiates a full reset cycle with 200 ms timeout, identical to power-on reset behavior. The pin must be pulled down externally during normal operation and driven actively low for manual assertion. This feature eliminates need for external reset buttons or RC networks.
Can CAT1026YI-42 monitor a second voltage rail besides VCC?
Yes, CAT1026YI-42 includes dedicated VSENSE and VLOW pins for auxiliary voltage monitoring. VSENSE accepts any voltage between 0 V and VCC, and the internal 1.25 V comparator asserts VLOW low when VSENSE falls below that threshold. An external resistor divider enables monitoring of rails such as 1.8 V, 2.5 V, or 3.3 V without additional components.
What is the I²C address of CAT1026YI-42 and how is it configured?
CAT1026YI-42 uses a 7-bit I²C slave address with four MSBs fixed at 1010 and three LSBs determined by metal option during fabrication. The default address is 1010000x (0xA0 for write, 0xA1 for read). Address bits A2–A0 are not user-configurable on the CAT1026YI-42; they are factory-programmed and documented in the device's ordering information section.
Is CAT1026YI-42 pin-compatible with other CAT1026 variants like CAT1026JI-30?
Yes, CAT1026YI-42 is fully pin-compatible with all CAT1026 variants-including CAT1026JI-30, CAT1026MI-28, and CAT1026TI-25-across all supported packages (SOIC, TSSOP, MSOP, TDFN, DIP). Pin functions, electrical characteristics, and timing are identical; only the reset threshold voltage and package suffix differ. No PCB redesign is required when substituting within the CAT1026 family.
CAT1026YI-42 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.25V, 4.5V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
CAT1026YI-42 FAQ
1.How can I place an order for CAT1026YI-42 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT1026YI-42 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 CAT1026YI-42 reliable?
The price and inventory of CAT1026YI-42 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT1026YI-42 is usually 5 days.
3.What payment methods are accepted for CAT1026YI-42?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1026YI-42 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT1026YI-42?
CAT1026YI-42 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT1026YI-42 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 CAT1026YI-42?
For technical support, including CAT1026YI-42 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1026YI-42 requirements.
6.How does Aetrix verify that CAT1026YI-42 is sourced from the original manufacturer or authorized distributors?
All CAT1026YI-42 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 CAT1026YI-42 meets industry standards.
7.What is the process for return or replacement of CAT1026YI-42?
All CAT1026YI-42 units undergo pre-shipment inspection (PSI). If there is an issue with CAT1026YI-42, 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 CAT1026YI-42 part is unused and in its original packaging.
Return procedure for CAT1026YI-42:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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