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onsemi CAT823YSDI-GT3
- Part No.:
- CAT823YSDI-GT3
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
CAT823YSDI-GT3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,985
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Product details
Overview
CAT823YSDI-GT3 from onsemi is a system supervisory voltage reset IC with integrated watchdog timer and manual reset input, designed for brownout detection and power-on reset in low-voltage embedded systems. It features a 2.19 V ±15 mV reset threshold, 140–400 ms reset timeout, 1.12–3.20 s watchdog timeout, TSOT-23-5 package, and operates from −40°C to +85°C. It is used in portable equipment requiring reliable microcontroller reset under unstable supply conditions.
For engineers reviewing the CAT823YSDI-GT3 datasheet, pinout, applications, or equivalent options, key selection criteria include reset threshold accuracy (2.19 V), watchdog timeout tolerance, MR input debounce timing, push-pull RESET output drive capability, and compatibility with 2.5 V/3.0 V logic domains.
Technical Context
The CAT823YSDI-GT3 implements a precision bandgap-based voltage reference with 40 ppm/°C tempco and 5 mV hysteresis to detect VCC drops below 2.19 V. Its digital delay block enforces a minimum 140 ms active-reset period after VCC exceeds VRST, ensuring processor stabilization.
Watchdog functionality monitors WDI transitions with a 1.12–3.20 s timeout window; the MR input is internally pulled up with 35–75 kΩ and debounced to reject noise pulses <100 ns. RESET is a CMOS push-pull output capable of sourcing 30 µA at 0.8×VCC and sinking 1.2 mA at 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19 V ±0.06 V - precisely targets 2.5 V system brownout detection with 5 mV hysteresis to prevent chatter during slow VCC recovery |
| Reset Timeout | 140–400 ms - guarantees minimum processor hold time post-power-up or post-brownout, configurable via internal timer |
| Watchdog Timeout | 1.12–3.20 s - provides fail-safe recovery window for firmware hangs in battery-powered microcontrollers |
| Supply Range | 1.2–5.5 V at −40°C to +85°C - supports operation down to 1.2 V, enabling use in deep-sleep or ultra-low-power states |
| MR Pullup Resistance | 35–75 kΩ - allows direct connection to mechanical pushbutton without external resistor; ensures clean low-to-high transition release |
| RESET Output Type | CMOS push-pull - eliminates need for external pull-up, drives standard logic inputs directly, sinks 1.2 mA at VOL ≤0.3 V |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded applications including portable instrumentation and control panels |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 2.90 mm × 1.60 mm × 0.95 mm body, 0.95 mm pitch, NiPdAu lead finish, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.2–5.5 V; powers internal reference, comparator, and digital logic; supplies RESET output stage |
| WDI | Watchdog timer input | Edge-triggered input; requires low-to-high or high-to-low transition every ≤3.20 s; disabled when tri-stated or open |
| RESET | Active-low reset output | CMOS push-pull; asserts low during power-up, brownout, watchdog timeout, or MR assertion; holds ≥140 ms |
| GND | Ground reference | Return path for all internal circuits and RESET output; must be low-impedance for accurate threshold sensing |
| MR | Manual reset input | Active-low; internally pulled up; debounced; initiates reset when held low ≥1 µs; releases after 5 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Reset Threshold | 2.19 V variant enables precise brownout protection for 2.5 V systems without external resistive dividers |
| Integrated Watchdog Timer | 1.12–3.20 s timeout range detects firmware lockups in resource-constrained microcontrollers without external RC network |
| Debounced Manual Reset | 100 ns noise immunity and 1 µs minimum pulse width allow direct pushbutton interface without external filtering |
| Push-Pull RESET Output | Eliminates external pull-up resistor, reduces BOM count, and ensures valid logic levels even at VCC = 1.2 V |
| Low-Voltage Operation | Functional down to 1.2 V supply enables use in battery-backed or energy-harvesting systems with undervoltage fallback |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose monitor operating from 2.4–2.8 V Li-ion cell with firmware-driven sleep/wake cycles. IC Role / Device Role / Timing Role: Supervisory reset generator that asserts RESET during cell voltage drop below 2.19 V and triggers watchdog reset if sensor firmware stalls. Use Value: Prevents corrupted sensor readings or missed alarms by enforcing hard reset before MCU enters undefined state. |
Use Scenario: DIN-rail mounted I/O module with isolated 24 V DC input powering 3.3 V logic, subject to line transients and brownouts. IC Role / Device Role / Timing Role: System-level voltage supervisor providing power-on reset, brownout detection, and manual reset via front-panel button. Use Value: Ensures deterministic startup and safe recovery from field-induced supply disturbances without requiring FPGA or MCU intervention. |
| Smart Meter Communication Units | Wearable Fitness Trackers |
|
Use Scenario: NB-IoT modem subsystem powered from regulated 3.0 V rail, requiring guaranteed reset during RF transmission current surges. IC Role / Device Role / Timing Role: Voltage monitor with 140 ms reset hold time and watchdog supervision of modem firmware execution. Use Value: Guarantees modem reinitialization after power droop caused by GSM burst transmission, preventing UART lockup or packet loss. |
Use Scenario: Ultra-low-power wristband using coin-cell battery and ARM Cortex-M0+ MCU with aggressive sleep modes. IC Role / Device Role / Timing Role: Low-threshold (2.19 V) supervisor enabling graceful shutdown and wake-from-reset when battery reaches end-of-life. Use Value: Extends usable battery life by allowing operation down to 2.2 V while ensuring controlled reset before data corruption occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823ZTR | 2.19 V reset threshold, same TSOT-23-5 package, but lacks watchdog timer and MR input | Suitable only for basic power-on reset; cannot replace CAT823YSDI-GT3 in watchdog-dependent designs | Select when watchdog and manual reset are unnecessary and cost minimization is critical |
| TPS3808G12QDBVRQ1 | 2.2 V threshold, automotive-grade (−40°C to +125°C), adjustable watchdog timeout via external capacitor | Requires external RC network for watchdog; higher quiescent current (1.2 µA vs. 4 µA typical) | Choose for AEC-Q100 compliance or when programmable watchdog timing is required |
Compared with MAX823ZTR and TPS3808G12QDBVRQ1, the CAT823YSDI-GT3 uniquely integrates fixed watchdog timeout, manual reset, and 2.19 V threshold in a single TSOT-23-5 package-enabling compact, self-contained reset supervision without external components or temperature derating compromises.
Availability
CAT823YSDI-GT3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and wearable fitness trackers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAT823YSDI-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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT823 family is part of onsemi's system supervision product line, engineered specifically for reliable power-on reset, brownout detection, and firmware watchdog protection in space-constrained, low-voltage embedded systems.
FAQ
What is the exact reset threshold voltage of the CAT823YSDI-GT3?
The CAT823YSDI-GT3 has a guaranteed reset threshold of 2.13 V (min), 2.19 V (typ), and 2.25 V (max) over −40°C to +85°C, with 5 mV hysteresis. This 2.19 V nominal value is factory-trimmed and specified per Table 3 in the official onsemi datasheet (Rev. 10, June 2024). The CAT823YSDI-GT3 uses this precise threshold to initiate reset when VCC falls below the trip point in 2.5 V domain systems.
Does the CAT823YSDI-GT3 include a watchdog timer, and what is its timeout range?
Yes, the CAT823YSDI-GT3 includes a built-in watchdog timer with a guaranteed timeout range of 1.12 s (min) to 3.20 s (max) at TA = −40°C to +85°C. The watchdog resets on any WDI pin edge transition and asserts RESET if no transition occurs within that window. This feature is confirmed in the Functional Description section and Table 3 of the CAT823/CAT824 datasheet. The CAT823YSDI-GT3 relies on this timeout to recover from firmware hangs without host processor intervention.
Can the CAT823YSDI-GT3 operate with supply voltages below 2.5 V?
Yes, the CAT823YSDI-GT3 is fully specified to operate from 1.2 V to 5.5 V across −40°C to +85°C ambient temperature. Its RESET output remains functional down to VCC = 1.2 V, and the internal voltage reference maintains accuracy per datasheet Table 2. This capability makes the CAT823YSDI-GT3 suitable for ultra-low-power applications such as coin-cell-powered wearables where supply voltage decays below 2.5 V during end-of-life.
What is the function and electrical behavior of the MR pin on the CAT823YSDI-GT3?
The MR (Manual Reset) pin on the CAT823YSDI-GT3 is an active-low input with internal 35–75 kΩ pull-up resistance. It initiates a reset when pulled below 0.3×VCC for ≥1 µs and includes hardware debounce rejecting noise pulses <100 ns. After MR release, RESET remains active for ≥140 ms. This behavior is documented in the PIN FUNCTIONS table and Functional Description section of the CAT823YSDI-GT3 datasheet. The CAT823YSDI-GT3 uses MR to enable front-panel reset buttons or processor-controlled emergency reset without external circuitry.
Is the CAT823YSDI-GT3 pin-compatible with other members of the CAT823 family?
Yes, the CAT823YSDI-GT3 shares identical TSOT-23-5 pinout and footprint with all CAT823 variants (e.g., CAT823RTDI-GT3, CAT823STDI-GT3) and the CAT824 series. Pin assignments-VCC, WDI, RESET, GND, MR-are fixed across the family per the PIN CONNECTIONS diagram. However, threshold voltage, watchdog presence, and RESET polarity differ between CAT823 and CAT824 models. The CAT823YSDI-GT3 maintains full mechanical and layout compatibility with other CAT823 variants, simplifying design reuse.
CAT823YSDI-GT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- 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:
- SC-88A (SC-70-5)
CAT823YSDI-GT3 FAQ
1.How can I place an order for CAT823YSDI-GT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT823YSDI-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 CAT823YSDI-GT3 reliable?
The price and inventory of CAT823YSDI-GT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT823YSDI-GT3 is usually 5 days.
3.What payment methods are accepted for CAT823YSDI-GT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT823YSDI-GT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT823YSDI-GT3?
CAT823YSDI-GT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT823YSDI-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 CAT823YSDI-GT3?
For technical support, including CAT823YSDI-GT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT823YSDI-GT3 requirements.
6.How does Aetrix verify that CAT823YSDI-GT3 is sourced from the original manufacturer or authorized distributors?
All CAT823YSDI-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 CAT823YSDI-GT3 meets industry standards.
7.What is the process for return or replacement of CAT823YSDI-GT3?
All CAT823YSDI-GT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT823YSDI-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 CAT823YSDI-GT3 part is unused and in its original packaging.
Return procedure for CAT823YSDI-GT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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