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onsemi CAT1640WI-30-G
- Part No.:
- CAT1640WI-30-G
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CAT1640WI-30-G.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,032
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Product details
Overview
CAT1640WI-30-G from onsemi is an integrated supervisory circuit with 64 kbit I²C EEPROM, designed for microcontroller-based systems requiring simultaneous power monitoring and nonvolatile data storage. It features active-low reset output, 3.00–3.15 V reset threshold, 400 kHz I²C interface, 3.0–5.5 V supply operation, and industrial temperature range (−40°C to +85°C), used in embedded power-up sequencing and brownout protection.
For engineers reviewing the CAT1640WI-30-G datasheet, pinout, applications, or equivalent options, key selection considerations include its precise 3.0 V system reset threshold, open-drain RESET output with manual reset capability, hardware write protection during low-VCC, 64-byte page write buffer, and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The CAT1640WI-30-G integrates a precision voltage monitor and 64 kbit serial EEPROM on a single die using low-power CMOS technology. Its reset controller guarantees valid reset assertion down to VCC = 1.0 V and provides 200 ms timeout after VCC exceeds the 3.00–3.15 V threshold, with 15 mV hysteresis and 30 ns glitch rejection.
EEPROM operation follows standard I²C protocol at up to 400 kHz, supporting byte and 64-byte page writes, immediate/current address read, selective/random read, and sequential read modes. Hardware data protection disables all memory writes when VCC falls below the reset threshold or during power-up until VCC stabilizes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00 V to 3.15 V - precisely targets 3.0 V system brownout detection with ±10% tolerance |
| I²C Clock Frequency | 400 kHz - enables fast configuration and parameter logging without bus contention |
| EEPROM Capacity | 64 kbit (8 k × 8) - stores firmware calibration data, device IDs, or runtime logs in microcontroller systems |
| Page Write Size | 64 bytes - reduces I²C transaction count for bulk configuration updates, improving write efficiency |
| Reset Timeout | 130–270 ms - ensures stable MCU initialization before release, compatible with typical boot loaders |
| Data Retention | 100 years - guarantees long-term storage integrity for infrequently updated settings |
| Endurance | 1,000,000 write/erase cycles - supports frequent recalibration or field-upgrade logging |
| Supply Range | 3.0 V to 5.5 V - interoperable across 3.3 V and 5 V logic domains without level shifting |
Pinout & Package
Package: 8-pin SOIC (Case 751BD), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Device Address Input | Hardwired LSB of I²C slave address; enables up to eight devices on same bus when combined with A1/A2 |
| 2 (A1) | Device Address Input | Mid-bit of I²C slave address; default low if unconnected, allowing flexible multi-device addressing |
| 3 (A2) | Device Address Input | MSB of I²C slave address; determines unique 7-bit address (1010xxx) for bus arbitration |
| 4 (VSS) | Ground Reference | Return path for reset logic and EEPROM core; must be low-impedance to ensure accurate VCC sensing |
| 5 (VCC) | Power Supply Input | Primary supply for both supervisor and EEPROM; powers internal voltage reference and I²C interface |
| 6 (RESET) | Active-Low Reset Output/Input | Open-drain output asserted low during brownout; also accepts manual reset pulses (≥5 µs high-to-low edge) |
| 7 (SCL) | I²C Clock Input | Master-generated clock synchronizing all EEPROM reads/writes; requires external pull-up resistor |
| 8 (SDA) | I²C Data Bidirectional Line | Open-drain bidirectional data line shared across I²C bus; supports ACK/NACK signaling and wire-OR topology |
Key Features
| Feature | Design Value |
|---|---|
| Precision VCC Monitor | 3.00–3.15 V threshold with 15 mV hysteresis ensures reliable reset activation/deactivation in 3.0 V systems |
| Hardware Write Protection | Automatic EEPROM write disable when VCC < 3.00 V prevents corruption during power ramp-up or brownout |
| Manual Reset Capability | RESET pin doubles as edge-triggered input - simplifies system-level reset button integration without extra logic |
| Glitch Immunity | Rejects VCC transients < 30 ns and RESET input glitches < 100 ns, eliminating false resets in noisy environments |
| Industrial Temperature Range | Operates from −40°C to +85°C - qualified for deployment in automotive body control modules and industrial PLCs |
Applications
| Embedded Power Sequencing | Calibration Data Storage |
|---|---|
Use Scenario: Microcontroller-based sensor node powers up from battery or DC-DC converter with variable ramp rate. IC Role / Device Role / Timing Role: CAT1640WI-30-G monitors VCC, holds MCU in reset until stable >3.00 V, then releases after 200 ms timeout. Use Value: Prevents erratic boot behavior and flash corruption by guaranteeing clean power-up sequence aligned to 3.0 V rail. |
Use Scenario: Factory-programmed calibration coefficients for analog front-end are stored once and read at startup. IC Role / Device Role / Timing Role: CAT1640WI-30-G serves as persistent memory holding 64-byte sensor offset/gain tables accessible via I²C. Use Value: Eliminates need for external EEPROM while ensuring data survives 100+ years and 1M write cycles. |
| System Brownout Recovery | Firmware Parameter Logging |
Use Scenario: Industrial motor drive experiences brief AC line sag causing VCC dip below 3.0 V. IC Role / Device Role / Timing Role: CAT1640WI-30-G detects drop, asserts RESET low within 5 µs, and maintains reset until VCC recovers and stabilizes. Use Value: Forces controlled shutdown and restart, avoiding partial state execution that could damage hardware or corrupt registers. |
Use Scenario: Smart meter logs energy consumption snapshots every 15 minutes into nonvolatile memory. IC Role / Device Role / Timing Role: CAT1640WI-30-G receives timestamped data over I²C and writes it using 64-byte page mode for efficiency. Use Value: Reduces I²C bus occupancy by 63× vs. byte writes, enabling concurrent real-time processing during logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA30+T | 3.00 V fixed reset threshold, no integrated EEPROM, SOT23-5 package | Requires external EEPROM for data storage; suited for space-constrained designs where memory is handled separately | Select when board area is critical and EEPROM is already provided elsewhere in BOM |
| STM8T142M2U6 | 3.0 V reset, 128 Byte EEPROM, 8-pin SOIC, but uses SPI interface instead of I²C | Requires SPI-capable MCU; lacks 64-byte page write and I²C multi-drop support | Select when existing design uses SPI peripherals and needs tighter integration of reset + small EEPROM |
Compared with MAX6361KA30+T and STM8T142M2U6, CAT1640WI-30-G uniquely combines I²C-compatible 64 kbit EEPROM with precise 3.0 V supervision in SOIC-8, eliminating external memory and simplifying firmware update architecture.
Availability
CAT1640WI-30-G is available at Aetrix Electronics and suitable for embedded power sequencing, calibration data storage, system brownout recovery, and firmware parameter logging requiring stable component supply across industrial and automotive temperature ranges.
Supply support for CAT1640WI-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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The CAT1640 series belongs to onsemi's supervisory IC product line, engineered to consolidate power monitoring and nonvolatile memory in resource-constrained microcontroller systems where reliability and board space are critical.
FAQ
What is the reset behavior of the CAT1640WI-30-G during power-up?
The CAT1640WI-30-G asserts its open-drain RESET pin low when VCC rises above 1.0 V and holds it active until VCC exceeds the 3.00–3.15 V threshold, then maintains reset for 130–270 ms before releasing. This ensures the host microcontroller remains held in reset long enough for internal clocks and peripherals to stabilize, preventing premature execution. The CAT1640WI-30-G guarantees valid reset output even at VCC = 1.0 V, supporting ultra-low-voltage start-up scenarios.
Does the CAT1640WI-30-G support manual reset functionality?
Yes, the CAT1640WI-30-G allows the RESET pin to serve as both output and manual reset input. A high-to-low edge ≥5 µs on the RESET pin triggers a full 200 ms reset timeout, independent of VCC level. Glitches shorter than 100 ns are ignored, ensuring noise immunity. External pull-up is required, and the pin must be driven actively low-not just shorted-to initiate reset. This dual-role capability eliminates the need for discrete push-button reset circuitry in the CAT1640WI-30-G design.
How does hardware write protection work in the CAT1640WI-30-G?
The CAT1640WI-30-G disables all EEPROM write operations whenever VCC falls below the 3.00 V reset threshold or remains below it during power-up. This prevents partial writes and data corruption during brownout or unstable supply conditions. Even if a write command is issued, the CAT1640WI-30-G ignores it until VCC exceeds the threshold and stabilizes. Internal nonvolatile write cycles already in progress may complete if sufficient VCC (>2.0 V) remains for the full 5 ms duration, but new writes are blocked.
What I²C addressing options does the CAT1640WI-30-G support?
The CAT1640WI-30-G implements a 7-bit I²C slave address where the four MSBs are fixed at 1010, and the three LSBs (A2, A1, A0) are user-configurable via hardwired pins or left floating (defaulting to 0). This allows up to eight CAT1640WI-30-G devices on the same I²C bus. The R/W bit selects read (1) or write (0) mode. Addressing complies with standard I²C protocol, and the CAT1640WI-30-G responds with ACK only when its full 7-bit address matches and the bus is not busy.
Is the CAT1640WI-30-G compatible with 3.3 V and 5 V I²C buses?
Yes, the CAT1640WI-30-G operates from 3.0 V to 5.5 V and supports standard-mode I²C at 400 kHz across this range. Its SDA and SCL pins are open-drain with VIH = 0.7×VCC and VIL = 0.3×VCC, ensuring interoperability with both 3.3 V and 5 V masters. Pull-up resistors must match the bus voltage (e.g., 3.3 V for 3.3 V systems, 5 V for 5 V systems), and the CAT1640WI-30-G's VOL ≤ 0.4 V at 3 mA load guarantees solid low-level signaling in either configuration.
CAT1640WI-30-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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 Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CAT1640WI-30-G FAQ
1.How can I place an order for CAT1640WI-30-G through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT1640WI-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 CAT1640WI-30-G reliable?
The price and inventory of CAT1640WI-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 CAT1640WI-30-G is usually 5 days.
3.What payment methods are accepted for CAT1640WI-30-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1640WI-30-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT1640WI-30-G?
CAT1640WI-30-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT1640WI-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 CAT1640WI-30-G?
For technical support, including CAT1640WI-30-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1640WI-30-G requirements.
6.How does Aetrix verify that CAT1640WI-30-G is sourced from the original manufacturer or authorized distributors?
All CAT1640WI-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 CAT1640WI-30-G meets industry standards.
7.What is the process for return or replacement of CAT1640WI-30-G?
All CAT1640WI-30-G units undergo pre-shipment inspection (PSI). If there is an issue with CAT1640WI-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 CAT1640WI-30-G part is unused and in its original packaging.
Return procedure for CAT1640WI-30-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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