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HomeProductsIntegrated Circuits (ICs)Specialized ICsCAT809LSDI-G3
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CAT809LSDI-G3 - AMI Semiconductor/onsemi

Manufacturer Part Number
CAT809LSDI-G3
Manufacturer
onsemi
Allelco Part Number
32D-CAT809LSDI-G3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,980 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
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Specifications

CAT809LSDI-G3 Tech Specifications
AMI Semiconductor/onsemi - CAT809LSDI-G3 technical specifications, attributes, parameters and parts with similar specifications to AMI Semiconductor/onsemi - CAT809LSDI-G3

Product Attribute Attribute Value
Part Number CAT809LSDI-G3
Package DAC91001
Description DAC91001
Stock Condition Get 16980 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer onsemi
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

What is the operating voltage range for the CAT809LSDI-G3 supervisor IC, and how does this influence system design in battery-powered applications?
The CAT809LSDI-G3 operates within a supply voltage range from 2.7 V to 5.5 V, making it suitable for low-voltage systems commonly used in battery-operated devices such as IoT sensors or portable instrumentation. This wide input tolerance allows designers to use single-cell lithium-ion or alkaline batteries without requiring additional voltage regulation stages prior to the IC. The device’s ability to function reliably down to 2.7 V ensures robust power-on reset functionality even as battery voltage drops during discharge, reducing the risk of erratic microcontroller behavior due to undervoltage conditions.
How does the watchdog timer in the CAT809LSDI-G3 respond to a sustained low signal on the WDI pin, and what are the timing implications for system recovery?
When the WDI pin remains low for longer than the internal watchdog timeout period—typically 1.6 seconds—the CAT809LSDI-G3 asserts its RESET output after a delay of approximately 240 milliseconds. This delay provides a brief window during which the microcontroller can recover if the low signal was transient, preventing unnecessary resets caused by noise or temporary software glitches. Designers must ensure that critical tasks complete within the 1.6-second window to avoid triggering a reset; otherwise, the system will undergo a full restart cycle, which may be problematic in real-time control loops.
Can the CAT809LSDI-G3 be used as a power-on reset generator without relying on an external RC network, and what advantages does this offer in compact designs?
Yes, the CAT809LSDI-G3 integrates both a power-on reset circuit and a programmable watchdog timer, eliminating the need for discrete RC components typically required in basic POR circuits. This integration reduces board space, simplifies layout, and improves reliability by minimizing component count. For example, in a wearable device using the SC70-3 package, removing external capacitors and resistors not only saves footprint but also enhances immunity to parasitic inductance and capacitance effects that could otherwise compromise reset timing accuracy during rapid voltage transitions.
In what scenarios would the open-drain RESET output of the CAT809LSDI-G3 be preferred over a push-pull configuration, and how should pull-up resistors be selected?
The open-drain RESET output is ideal when interfacing with multiple devices on the same reset line or when driving loads requiring higher voltage levels than the logic supply. Since the CAT809LSDI-G3 only sinks current during assertion, a pull-up resistor (commonly 10 kΩ) must be connected between RESET and the target voltage rail, such as 3.3 V or 5 V. Choosing 10 kΩ balances response speed and power consumption—lower values increase current draw unnecessarily, while higher values slow down rise time and may fail to meet microcontroller specifications under capacitive loading typical in modern SoCs.
How does the CAT809LSDI-G3 compare to other voltage supervisors like the MAX809 or MCP101 in terms of minimum operating voltage and noise immunity?
Compared to the MAX809, which has a similar architecture but lacks a dedicated watchdog feature, the CAT809LSDI-G3 offers integrated monitoring capabilities at the cost of slightly tighter threshold tolerances (±1.5% vs. ±2%). Against the MCP101, which supports a lower dropout voltage, the CAT809LSDI-G3 trades efficiency for added functionality—its 2.7 V minimum supply enables operation closer to battery depletion. However, the MCP101 generally exhibits better transient response under load steps, whereas the CAT809LSDI-G3 prioritizes deterministic reset signaling over ultra-low quiescent current, making it preferable in precision measurement systems where timing predictability outweighs power savings.
What precautions should be taken when cascading multiple reset sources with the CAT809LSDI-G3 in a complex embedded system?
Cascading reset signals requires careful attention to propagation delays and logic levels. Since the CAT809LSDI-G3’s RESET output is active-low and open-drain, it can be OR’ed with other reset sources via diodes, but each additional source introduces rise time degradation and potential leakage paths. To maintain reliable operation, ensure that all upstream resets have compatible voltage levels and that total pull-up resistance remains below the maximum sink capability of the combined outputs. In multi-supervisor designs, it's often safer to buffer the reset line with a logic gate rather than relying solely on passive components to preserve integrity across temperature extremes and long trace lengths.
Why might the 1.6-second watchdog timeout of the CAT809LSDI-G3 be too long for safety-critical automotive applications?
A 1.6-second timeout may allow software faults to persist unchecked in safety-critical systems where rapid fault detection is essential—such as engine control units or brake management modules. If the application loop executes every 200 ms and fails once per hour, the CAT809LSDI-G3 would still trigger a reset after five failed cycles, delaying diagnosis and potentially violating functional safety standards like ISO 26262. In such cases, external hardware watchdogs with shorter, configurable timeouts or dual-channel monitoring architectures are more appropriate, despite increasing component count.
How does the SC70-3 packaging impact thermal performance and PCB routing considerations for the CAT809LSDI-G3?
The SC70-3 package measures just 2.0 mm × 1.25 mm with a 0.5 mm pitch, offering high density but presenting challenges in manual soldering and thermal dissipation due to minimal exposed area. While the CAT809LSDI-G3 itself dissipates very little power (typically <1 µW), its small size limits heat spreading, so adjacent high-power components should be spaced adequately to avoid localized heating affecting nearby sensitive analog traces. Additionally, routing feedback traces close to the IC may introduce noise into the internal comparator reference path, necessitating guard rings or careful layer stackup planning in mixed-signal boards.
What is the significance of the "L" suffix in the CAT809LSDI-G3 model number, and how does it affect procurement and compatibility?
The "L" denotes a lead-free (RoHS-compliant) version of the CAT809LSDI-G3, ensuring compliance with environmental regulations and compatibility with modern reflow soldering processes. This variant maintains identical electrical characteristics but uses SnAgCu solder finishes instead of tin-lead alloys. Procurement teams must verify that "L" suffix parts are stocked by distributors and available through standard channels, as some legacy inventories may contain non-L versions, leading to potential mismatch in manufacturing lots during mass production runs.
Can the CAT809LSDI-G3 monitor multiple supply rails simultaneously, or is it limited to a single voltage domain?
No, the CAT809LSDI-G3 is designed for monitoring a single supply rail only. Its internal comparator references the monitored voltage against a fixed threshold (e.g., 2.93 V for the -T version). Attempting to monitor two rails would require either an external divider per rail or additional supervisor ICs, as the device lacks multiplexing or differential input capabilities. For systems with multiple rails—such as core logic at 1.8 V and I/O at 3.3 V—designers must implement separate supervision circuits, increasing complexity and board area unless shared reset strategies are employed.
How does temperature variation affect the accuracy of the reset threshold in the CAT809LSDI-G3, and what are the implications for industrial-grade designs?
Over the commercial temperature range (-40°C to +85°C), the CAT809LSDI-G3 maintains threshold accuracy within ±1.5%, but drift can accumulate near extremes. For instance, a 2.93 V nominal threshold may vary between 2.88 V and 2.98 V depending on calibration lot and temperature cycling history. In industrial automation environments where ambient temperatures fluctuate widely, this variability could cause premature resets or missed fault conditions if margins are not conservatively allocated. Using overshoot/undershoot buffers and ensuring adequate decoupling helps stabilize the supply before monitoring begins, mitigating some of these effects.
Is it acceptable to leave the WDI pin floating if the watchdog function is not needed in a design using the CAT809LSDI-G3?
Leaving the WDI pin unconnected risks unintended state changes due to noise pickup, which could inadvertently trigger the watchdog timer and cause false resets. Instead, the pin should be tied high through a resistor (e.g., 1 MΩ) to prevent floating while minimizing DC current. Alternatively, connect it to a periodic GPIO toggle from the microcontroller if watchdog functionality is desired. This approach ensures predictable behavior and avoids latent bugs arising from undefined input states during power-up sequences.
What are the key differences between the CAT809LSDI-G3 and the CAT809SCDI-G3 in terms of reset polarity and package compatibility?
Both share the same SC70-3 package and electrical interface, but the "S" variant features an active-high RESET output instead of open-drain. This means the CAT809SCDI-G3 pulls the line high when asserting reset, requiring a pull-down resistor for proper idle state. The choice depends on the host microcontroller’s reset input requirements: most modern MCUs expect active-low resets, favoring the SDI version, though some older designs accommodate high-active signals. Otherwise, both perform identically in terms of thresholds, watchdog timing, and power consumption.
How does the absence of ESD protection specification in the CAT809LSDI-G3 datasheet impact handling during prototyping?
Without explicit HBM (Human Body Model) ratings listed, the CAT809LSDI-G3 likely relies on system-level ESD measures rather than built-in diode networks common in more rugged devices. During breadboarding or hand-soldering, static discharge through the SC70-3 pins can damage the delicate internal circuitry, especially the comparator inputs. Designers should use grounded workstations, wrist straps, and avoid touching exposed leads. Once populated on a properly designed PCB with adequate ESD clamping diodes near connectors, the risk diminishes significantly.
In what way does the 240 ms reset assertion delay in the CAT809LSDI-G3 benefit system stability compared to instant resets?
The 240 ms delay prevents nuisance resets during brief power sags or capacitor recharge events following load transients. For example, when a motor driver briefly dips the supply rail, the CAT809LSDI-G3 allows the microcontroller to stabilize before asserting reset, avoiding repeated restarts that could corrupt volatile memory or disrupt user interactions. This grace period aligns well with typical boot-up sequences in microcontrollers, giving them time to initialize peripherals and enter safe modes without interruption.
Can the CAT809LSDI-G3 be used in conjunction with brown-out detection (BOD) features in modern microcontrollers to create redundant fault protection?
Absolutely. Pairing the CAT809LSDI-G3 with a microcontroller’s internal BOD creates layered fault detection: the supervisor handles external supply anomalies and watchdog failures, while the BOD monitors internal regulator health. This redundancy improves system robustness—for instance, if the MCU’s BOD misinterprets a valid dip as a brownout, the external CAT809LSDI-G3 can still trigger a reset. Such dual-path monitoring is common in medical devices or grid sensors where failure modes carry significant risk.

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    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

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    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
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AMI Semiconductor/onsemi

CAT809LSDI-G3

AMI Semiconductor/onsemi
32D-CAT809LSDI-G3

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