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onsemi CAT1161LI-30-G
- Part No.:
- CAT1161LI-30-G
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
CAT1161LI-30-G.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
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Product details
Overview
CAT1161LI-30-G from onsemi is a supervisory IC integrating 16 Kb I²C EEPROM, precision reset controller with 3.00–3.15 V threshold, and 1.6-second watchdog timer monitoring SDA activity. It operates from 2.7 V to 6 V, features hardware write protection via WP pin and VCC lockout, and targets microcontroller-based systems requiring power-up/down supervision and nonvolatile configuration storage.
For engineers reviewing the CAT1161LI-30-G datasheet, pinout, applications, or equivalent options, key selection considerations include its dual active-high/low reset outputs, 400 kHz I²C compatibility, 16-byte page write buffer, 1,000,000 program/erase cycles, and manual reset debouncing capability.
Technical Context
The CAT1161LI-30-G implements a precision voltage monitor with 3.00–3.15 V reset threshold (VTH) and 15 mV hysteresis (VRT), ensuring reliable brownout detection for 3 V systems. Its reset outputs remain active for 130–270 ms after power-up (tPURST) and are valid down to VCC = 1.0 V (VRVALID).
The integrated watchdog timer clears on any SDA transition and times out after 1.6 s of inactivity, triggering both RESET and RESET outputs. The 16 Kb EEPROM uses I²C protocol at up to 400 kHz, supports byte and 16-byte page writes, and enforces hardware write protection via WP pin and VCC-sensed lockout below reset threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00–3.15 V - precisely matches 3 V system supply rails to prevent premature or delayed reset assertion |
| Watchdog Timeout | 1.6 s - provides deterministic recovery window for firmware hangs without requiring dedicated watchdog trace |
| I²C Speed | 400 kHz - enables fast configuration data access compatible with standard high-speed I²C controllers |
| EEPROM Endurance | 1,000,000 cycles - supports frequent calibration or logging updates over product lifetime |
| Data Retention | 100 years - guarantees long-term storage integrity of critical boot parameters or device IDs |
| Supply Range | 2.7–6.0 V - accommodates wide input variation across industrial and battery-powered applications |
| Power-Up Reset Delay | 130–270 ms - ensures microcontroller core and peripherals stabilize before release from reset |
Pinout & Package
Package: 8-pin PDIP (Case 646AA), 300-mil width, RoHS-compliant, lead finish NiPdAu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DC) | Do Not Connect | No internal connection; must be left floating or tied to GND per layout best practice |
| 2 (RESET) | Active-Low Reset Output/Input | Open-drain output; also accepts manual reset edge trigger (low-to-high) with 200 ms debounce timing |
| 3 (WP) | Write Protect Control | High = full EEPROM read-only mode; low/floating = normal read/write access |
| 4 (GND) | Ground Reference | Primary return path for reset drivers, EEPROM core, and voltage monitor comparators |
| 5 (VCC) | Power Supply Input | Supplies all internal blocks; enables VCC-based write lockout and reset assertion below 3.00 V |
| 6 (RESET) | Active-High Reset Output/Input | Open-drain output; also accepts manual reset edge trigger (high-to-low) with 200 ms debounce timing |
| 7 (SCL) | I²C Clock Input | Master-generated clock synchronizing all EEPROM read/write and address pointer operations |
| 8 (SDA) | I²C Data/Address Bidirectional | Shared bus line for EEPROM communication and watchdog input - transitions clear timeout counter |
Key Features
| Feature | Design Value |
|---|---|
| SDA-Monitored Watchdog | Eliminates need for dedicated watchdog signal trace; leverages existing I²C data line for system health monitoring |
| Dual Reset Outputs | Simultaneous active-high and active-low signals simplify interface to diverse MCU reset inputs without level-shifting |
| VCC-Sensed Write Protection | Prevents EEPROM corruption during brownout by disabling writes whenever VCC < 3.00 V or during power-up ramp |
| 16-Byte Page Write Buffer | Reduces I²C transaction count by up to 16× versus byte writes, improving firmware update efficiency and bus utilization |
| Manual Reset Debounce | Internal 200 ms timer filters mechanical switch bounce, enabling direct pushbutton connection without external RC network |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Maintains calibrated sensor offsets and user preferences across power cycles in a battery-backed portable analyzer. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset coordination, nonvolatile parameter storage, and watchdog-triggered recovery from firmware stalls. Use Value: Ensures measurement repeatability by preserving calibration data with 100-year retention and prevents field failures via 1.6 s watchdog response to unresponsive UI tasks. |
Use Scenario: Stores device serial number, usage logs, and safety-critical configuration in a Class II medical instrument with strict data integrity requirements. IC Role / Device Role / Timing Role: Dual-role component acting as both EEPROM data vault and system supervisor enforcing safe boot sequence and brownout immunity. Use Value: Meets IEC 62304 software lifecycle requirements through hardware-enforced write protection and deterministic reset timing under 3 V supply variations. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Logs energy consumption history and tariff schedules while surviving grid voltage sags and surges in utility-grade meters. IC Role / Device Role / Timing Role: Precision reset controller with 3.00–3.15 V threshold and 16 Kb EEPROM for tamper-resistant event logging. Use Value: Guarantees accurate billing data persistence using 1,000,000-cycle endurance and VCC-locked write protection during brownout events. |
Use Scenario: Manages lighting profiles and door lock settings in a 12 V automotive subsystem with local 3.3 V regulation. IC Role / Device Role / Timing Role: System supervisor coordinating MCU reset release with stable 3.3 V rail and storing user-configurable feature enablement bits. Use Value: Enables seamless feature personalization across vehicle models using identical hardware, with EEPROM write protection preventing accidental corruption during load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EPA+ | Standalone 3.0 V reset IC only - no EEPROM or watchdog; 200 ms reset timeout; SO-8 package | Requires external EEPROM and separate watchdog circuit; suitable when memory size or integration is not required | Select when cost-sensitive designs prioritize minimal BOM count over integration and can allocate board space for discrete functions |
| STM8T142M2U6 | 32-bit MCU with embedded 16 Kb EEPROM and programmable watchdog - no dedicated reset monitor; 3.0–5.5 V operation | Offers firmware-controlled reset logic and flexible watchdog intervals but lacks precision analog voltage monitoring | Choose when system requires adaptive reset behavior or cryptographic secure boot, accepting higher design complexity and validation effort |
Compared with MAX6816EPA+ and STM8T142M2U6, the CAT1161LI-30-G uniquely delivers tightly coupled voltage supervision, hardware-enforced EEPROM protection, and SDA-monitored watchdog in a single 8-pin PDIP - reducing PCB area, eliminating inter-component timing dependencies, and simplifying qualification for safety-critical firmware recovery.
Availability
CAT1161LI-30-G is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical handheld diagnostics, and automotive body control modules requiring stable component supply, long-term data retention, and deterministic power-supervision behavior.
Supply support for CAT1161LI-30-G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and medical markets.
The CAT1161LI-30-G belongs to onsemi's supervisory circuits product line, engineered to consolidate power monitoring, nonvolatile memory, and system recovery functions into single-chip solutions for resource-constrained microcontroller systems.
FAQ
What is the function of the DC pin on the CAT1161LI-30-G?
The DC (Do Not Connect) pin on the CAT1161LI-30-G has no internal connection and must remain unconnected or tied to ground per layout guidelines. It is reserved for manufacturing test purposes and carries no electrical function in normal operation. Leaving it floating avoids unintended coupling, while grounding it eliminates potential noise pickup in high-density PCB layouts. This pin does not affect the performance of the CAT1161LI-30-G reset, EEPROM, or watchdog functions.
How does the CAT1161LI-30-G watchdog timer interact with I²C communication?
The CAT1161LI-30-G watchdog timer monitors the SDA line exclusively: any transition (high-to-low or low-to-high) resets its 1.6-second timeout counter. During normal I²C transactions, SDA activity inherently clears the watchdog, so no additional firmware action is needed. If communication halts - for example, due to MCU lockup - the absence of SDA edges triggers a reset on both RESET and RESET outputs. This behavior is intrinsic to the CAT1161LI-30-G and requires no configuration or register access.
Can the CAT1161LI-30-G operate reliably at 2.7 V supply voltage?
Yes, the CAT1161LI-30-G is fully specified for operation from 2.7 V to 6.0 V. At 2.7 V, its reset circuit remains functional with the 3.00–3.15 V threshold inactive (since VCC < VTH), holding both RESET outputs active until VCC rises above threshold. The EEPROM retains full 400 kHz I²C functionality and 16-byte page write capability at 2.7 V, and the watchdog continues monitoring SDA. All DC and AC parameters in the datasheet are validated across this range, including the CAT1161LI-30-G's 40 µA standby current at 3.3 V.
What happens to the CAT1161LI-30-G EEPROM during a reset condition?
During any active reset condition - whether triggered by power-up, brownout, manual button press, or watchdog timeout - the CAT1161LI-30-G disables all EEPROM access. Attempts to initiate I²C transactions result in no ACK response on SDA, and internal write cycles are blocked. This hardware-enforced lockout prevents data corruption during unstable power or system recovery. The CAT1161LI-30-G resumes normal EEPROM operation only after both RESET outputs deactivate and VCC stabilizes above 3.00 V for ≥200 ms.
Is the CAT1161LI-30-G pin-compatible with other CAT1161 variants?
Yes, all CAT1161 variants - including CAT1161LI-45-G, CAT1161LI-42-G, CAT1161LI-30-G, CAT1161LI-28-G, and CAT1161LI-25-G - share identical 8-pin PDIP pinout, electrical characteristics, and functional block diagram. Only the reset threshold voltage differs between variants; all other specifications - EEPROM size, watchdog behavior, I²C interface, and pin functions - are identical. This allows direct substitution in existing designs when adjusting for different supply rail tolerances, without PCB or firmware changes.
CAT1161LI-30-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
CAT1161LI-30-G FAQ
1.How can I place an order for CAT1161LI-30-G through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT1161LI-30-G 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 CAT1161LI-30-G reliable?
The price and inventory of CAT1161LI-30-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT1161LI-30-G is usually 5 days.
3.What payment methods are accepted for CAT1161LI-30-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1161LI-30-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT1161LI-30-G?
CAT1161LI-30-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT1161LI-30-G 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 CAT1161LI-30-G?
For technical support, including CAT1161LI-30-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1161LI-30-G requirements.
6.How does Aetrix verify that CAT1161LI-30-G is sourced from the original manufacturer or authorized distributors?
All CAT1161LI-30-G 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 CAT1161LI-30-G meets industry standards.
7.What is the process for return or replacement of CAT1161LI-30-G?
All CAT1161LI-30-G units undergo pre-shipment inspection (PSI). If there is an issue with CAT1161LI-30-G, 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 CAT1161LI-30-G part is unused and in its original packaging.
Return procedure for CAT1161LI-30-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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