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onsemi CAT823LTDI-GT3
- Part No.:
- CAT823LTDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT823LTDI-GT3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,647
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Product details
Overview
CAT823LTDI-GT3 from onsemi is a system supervisory voltage reset IC with integrated watchdog timer and manual reset input, designed for microprocessor power-on and brownout monitoring in 3.0 V systems. It provides a CMOS push-pull active-low RESET output, 140 ms minimum reset timeout, 3.00 V ±15 mV reset threshold, and operates across −40°C to +85°C ambient temperature.
For engineers reviewing the CAT823LTDI-GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include reset threshold accuracy (3.00–3.15 V), watchdog timeout (1.12–3.20 s), MR input pull-up resistance (35–75 kΩ), TSOT-23-5 package compatibility, and functional distinction from CAT824 variants lacking MR.
Technical Context
The CAT823LTDI-GT3 implements a precision bandgap-based voltage reference with 40 ppm/°C tempco and internal hysteresis (5 mV) to ensure stable brownout detection during supply transients. Its digital delay block enforces a guaranteed 140 ms reset assertion after VCC exceeds VRST, independent of supply ramp rate.
Watchdog functionality relies on edge-triggered WDI input sampling; timeout resets only upon low-to-high or high-to-low transitions within 1.12–3.20 s. Manual reset is debounced and internally timed-MR low pulse ≥1 µs initiates full tRP reset, with 5 µs delay from MR release to RESET activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00 V min / 3.08 V typ / 3.15 V max - ensures reliable reset assertion before 3.0 V system logic fails |
| Reset Timeout (tRP) | 140–400 ms - guarantees sufficient stabilization time for 3.0 V microcontrollers post-power-up |
| Watchdog Timeout (tWD) | 1.12–3.20 s - configurable via external timing components for software supervision intervals |
| MR Pull-up Resistance | 35–75 kΩ - enables direct pushbutton interface without external biasing |
| Operating Temp Range | −40°C to +85°C - supports industrial-grade embedded control environments |
| Supply Current (ICC) | 4–12 µA - ultra-low quiescent draw for battery-backed or portable applications |
| RESET Output Drive | VOL = 0.3 V @ 1.2 mA sink - compatible with 3.0 V CMOS logic inputs |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 2.90 mm × 1.60 mm × 0.95 mm profile, RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.2–5.5 V; powers internal reference, timer, and output stage |
| WDI | Watchdog timer input | Edge-sensitive; floating or tri-stated disables watchdog; requires ≥50 ns pulse width |
| RESET | Active-low reset output | CMOS push-pull; drives processor reset pin directly; valid down to VCC = 1.0 V |
| GND | Ground reference | Return path for all internal circuits and output current |
| MR | Manual reset input | Internally pulled up; asserted low to force reset; debounced with 1 µs noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Accurate 3.0 V brownout detection | 3.08 V typical threshold with ±15 mV tolerance and 5 mV hysteresis prevents chatter during slow VCC decay |
| Integrated watchdog timer | 1.12–3.20 s timeout window enables firmware health verification without external RC network |
| Pushbutton-compatible MR input | 52 kΩ internal pull-up eliminates external resistor; supports mechanical switch or open-drain MCU GPIO |
| Guaranteed 140 ms reset hold time | Ensures processor clocks and memory stabilize before release-even under fast-ramping 3.0 V supplies |
| Low-voltage operation support | Functional down to VCC = 1.2 V at full temperature range, enabling use in partial-power-fail scenarios |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power cycling during field maintenance or battery swap in programmable logic controllers. IC Role / Device Role / Timing Role: Supervises 3.0 V I/O and communication rails; asserts RESET until stable, then holds for 140 ms to synchronize FPGA configuration. Use Value: Prevents metastability in register banks by guaranteeing clean reset release aligned with clock domain stabilization. | Use Scenario: Battery-powered ultrasound probe requiring fail-safe restart after low-battery shutdown. IC Role / Device Role / Timing Role: Monitors main 3.0 V analog front-end supply; triggers watchdog reset if DSP firmware hangs during signal processing. Use Value: Enables autonomous recovery without user intervention-critical for clinical workflow continuity. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Voltage sag during load dump or cold-crank events in residential electricity meters. IC Role / Device Role / Timing Role: Detects VCC drop below 3.00 V; holds RESET active until rail recovers and sustains >140 ms to reinitialize metrology ASIC. Use Value: Eliminates corrupted kWh accumulation by blocking ADC sampling during unstable supply conditions. | Use Scenario: Reset coordination between microcontroller and CAN transceiver during ignition cycle. IC Role / Device Role / Timing Role: Provides synchronized 3.0 V reset to both MCU and peripheral ICs; MR tied to ignition switch for hard reset on key-off/key-on transition. Use Value: Ensures deterministic boot sequence across distributed ECUs-prevents CAN bus arbitration errors at startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TUT+T | 3.08 V reset threshold, same TSOT-23-5 pinout, but no watchdog timer; 200 ms fixed reset timeout | Lacks WDI functionality; suitable only where software supervision is handled externally or omitted | Select when watchdog capability is unnecessary and MAX823 pin compatibility is required for legacy designs |
| TPS3808G30DBVR | 3.0 V threshold, 200 ms reset delay, no MR input; includes enable input instead; higher ICC (12 µA vs. 4 µA) | Requires external enable control; not suited for pushbutton-initiated reset; optimized for low-noise analog systems | Choose for noise-sensitive applications where MR is unused and enable sequencing is preferred over manual override |
Compared with MAX823TUT+T and TPS3808G30DBVR, the CAT823LTDI-GT3 uniquely combines 3.0 V brownout detection, manual reset, and watchdog in one TSOT-23-5 package-enabling compact, self-contained reset supervision without external components or firmware overhead.
Availability
CAT823LTDI-GT3 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, automotive body control modules, and portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for CAT823LTDI-GT3 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT823 family delivers system-level voltage supervision with integrated watchdog and manual reset-designed specifically for robust, space-constrained microprocessor reset management in harsh industrial and portable environments.
FAQ
What is the exact reset threshold voltage of CAT823LTDI-GT3 and how is it specified across temperature?
The CAT823LTDI-GT3 has a guaranteed reset threshold of 3.00 V (min) to 3.15 V (max) over −40°C to +85°C, with 3.08 V typical at 25°C. Its 40 ppm/°C tempco ensures drift remains within ±15 mV across full operating range-critical for consistent 3.0 V system behavior during thermal cycling.
Does CAT823LTDI-GT3 support operation below 3.0 V, and what is its minimum functional VCC?
Yes, CAT823LTDI-GT3 operates down to VCC = 1.2 V across −40°C to +85°C per recommended conditions. Its RESET output remains valid down to VCC = 1.0 V, enabling brownout detection and controlled shutdown in partial-failure scenarios where other 3.0 V supervisors cease functioning.
How does the manual reset (MR) input of CAT823LTDI-GT3 behave when connected to a pushbutton?
When a pushbutton pulls MR low, CAT823LTDI-GT3 asserts RESET after ≤5 µs delay and holds it active for ≥140 ms. The internal 52 kΩ pull-up eliminates external biasing, and 100 ns noise immunity prevents false triggers from contact bounce-making direct mechanical switch interfacing fully reliable.
Can CAT823LTDI-GT3 be used in systems requiring an active-high reset signal?
No-CAT823LTDI-GT3 provides only an active-low RESET output. For active-high reset requirements, a discrete inverter or an alternative part like CAT824 (which offers both RESET and RESET outputs) must be selected. The CAT823LTDI-GT3 datasheet confirms RESET is CMOS push-pull active-low only.
What is the watchdog timeout behavior of CAT823LTDI-GT3 when the WDI pin is left floating?
When WDI is floating or tri-stated, CAT823LTDI-GT3 detects the open condition and cycles WDI low for 7/8ths of tWD (≈0.98–2.8 s) then high for 1/8th (≈0.14–0.4 s). This pattern repeats indefinitely-preventing unintended reset while signaling improper WDI connection, unlike permanent timeout assertion.
CAT823LTDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT823LTDI-GT3 FAQ
1.How can I place an order for CAT823LTDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT823LTDI-GT3 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 CAT823LTDI-GT3 reliable?
The price and inventory of CAT823LTDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT823LTDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT823LTDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT823LTDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT823LTDI-GT3?
CAT823LTDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT823LTDI-GT3 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 CAT823LTDI-GT3?
For technical support, including CAT823LTDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT823LTDI-GT3 requirements.
6.How does Aetrix verify that CAT823LTDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT823LTDI-GT3 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 CAT823LTDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT823LTDI-GT3?
All CAT823LTDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT823LTDI-GT3, 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 CAT823LTDI-GT3 part is unused and in its original packaging.
Return procedure for CAT823LTDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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