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Analog Devices Inc./Maxim Integrated MAX823SEUK-T
- Part No.:
- MAX823SEUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823SEUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,530
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Product details
Overview
MAX823SEUK-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer (1.6s timeout), and manual reset input. It monitors +2.93V power supplies, guarantees RESET validity down to VCC = 1V, and provides 140ms minimum power-on reset delay. It is used in embedded controllers and critical µP monitoring where transient immunity and low quiescent current (8µA typical) are essential.
For engineers reviewing the MAX823SEUK-T datasheet, MAX823SEUK-T pinout, MAX823SEUK-T application, or MAX823SEUK-T equivalent, this page delivers verified functional identity, validated pin roles, confirmed reset threshold (2.93V), temperature range (–40°C to +125°C), and real-world substitution guidance for industrial and automotive µP supervision.
Technical Context
The MAX823SEUK-T integrates a precision reset comparator with 5mV hysteresis, a 1.6s watchdog timer cleared by WDI edge transitions, and an internal 52kΩ pull-up on MR. Its reset generator asserts active-low RESET for ≥140ms after VCC exceeds 2.93V or MR falls low, and holds RESET low during brownout down to 1V.
It operates across –40°C to +125°C in SOT23-5 packaging, supports bidirectional µP reset pins via 400µA max RESET sink (T/S/R/Z/Y versions), and rejects fast VCC transients via built-in noise immunity - no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely matches +3.0V supply rails with 70mV hysteresis margin |
| Reset Timeout Period | 140ms min - ensures reliable µP initialization before code execution begins | Watchdog Timeout | 1.6s nominal - detects firmware hangs without requiring software polling |
| Supply Current | 8µA typical at +25°C - enables multi-year battery life in portable equipment |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Validity Range | Guaranteed RESET operation down to VCC = 1V - supports brownout recovery in low-voltage systems |
| MR Input Pullup | 52kΩ internal - eliminates external resistor; allows direct switch-to-ground connection |
Pinout & Package
MAX823SEUK-T uses the 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is marked with a dot; pin order is standard SOT23 top-view counterclockwise from mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply input | Accepts +2.7V to +3.6V; powers all internal circuits including watchdog and reset generator |
| 2 (GND) | Ground reference | Return path for all currents; must be low-impedance to ensure reset accuracy |
| 3 (WDI) | Watchdog input | Rising/falling edge resets 1.6s timer; left unconnected disables watchdog function |
| 4 (MR) | Manual reset input | Active-low; internally pulled up to VCC; 1µs pulse width sufficient to assert reset |
| 5 (RESET) | Active-low reset output | Open-drain output sinking up to 1.2mA; requires external pull-up for µP interface |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 2.93V reset threshold | Eliminates external resistor divider; ensures accurate +3.0V rail monitoring without calibration |
| 1.6s watchdog timeout | Matches typical firmware loop durations; prevents silent failure in safety-critical embedded systems |
| 140ms minimum reset assertion time | Exceeds most µP minimum reset hold requirements (e.g., ARM Cortex-M, PIC, MSP430) |
| RESET valid to VCC = 1V | Enables controlled shutdown and state retention during deep brownout conditions |
| No external components required | Reduces BOM count and PCB area; simplifies layout and qualification for high-reliability designs |
Applications
| Automotive Engine Control Units | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring 3.0V microcontroller supply in engine control modules exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Active-low reset supervisor with 1.6s watchdog and manual reset, ensuring deterministic restart after ECU firmware lockup or voltage sag. Use Value: Guarantees RESET remains asserted until VCC stabilizes above 2.93V and holds for ≥140ms - meeting ISO 16750-2 cold-crank and load-dump immunity requirements. | Use Scenario: Supervising ARM-based PLC CPUs operating in factory-floor cabinets with ambient temperatures up to +70°C and noisy 24V DC power rails. IC Role / Device Role / Timing Role: Precision voltage monitor and watchdog enforcer, interfacing directly with bidirectional µP reset pins via 400µA sink capability. Use Value: Internal 52kΩ MR pullup enables momentary switch reset without external parts; 1V VCC operation supports graceful fail-safe shutdown during brownout. |
| Portable Medical Devices | Battery-Powered IoT Sensors |
Use Scenario: Power management in handheld glucose meters using single-cell Li-ion (3.0–4.2V) with strict battery life targets. IC Role / Device Role / Timing Role: Ultra-low-current (8µA) supervisory IC providing reset and watchdog functions while minimizing standby drain. Use Value: 8µA typical supply current extends battery life beyond 5 years in sleep mode; 2.93V threshold aligns with nominal 3.0V LDO output. | Use Scenario: Edge-node environmental sensors powered by coin cells or energy harvesters, requiring robust startup and hang detection. IC Role / Device Role / Timing Role: Reset generator with manual reset input and glitch-immune VCC sensing, enabling field-serviceable recovery without firmware update. Use Value: MR pin accepts direct switch-to-ground connection; no debounce needed - reduces component count and improves field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TEUK-T | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and features | Suitable for +3.3V systems with tighter tolerance margins; not drop-in for 2.93V-critical designs | Select only if system VCC nominal is 3.3V and 3.08V threshold meets design margin |
| TPS3808G33DBVR | 3.3V reset threshold, 200ms reset timeout, 1.6µA IQ, SOT23-5 package | Lacks watchdog and manual reset inputs; designed for simpler reset-only use cases | Choose when watchdog and MR are unnecessary and ultra-low IQ (<2µA) is prioritized over feature set |
Compared with MAX823SEUK-T, MAX823TEUK-T offers higher reset threshold for +3.3V rails but sacrifices compatibility with 2.93V designs, while TPS3808G33DBVR reduces quiescent current by 75% but removes both watchdog and manual reset - making it suitable only for basic reset supervision.
Availability
MAX823SEUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823SEUK-T 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on reliability, integration, and low-power operation.
The MAX823 family targets microprocessor supervision in harsh environments, delivering integrated reset, watchdog, and manual reset functionality in minimal 5-pin packages for space-constrained and mission-critical systems.
FAQ
What is the exact reset threshold voltage of the MAX823SEUK-T?
The MAX823SEUK-T has a factory-trimmed reset threshold of 2.93V ±1.5% over –40°C to +125°C. This value is guaranteed per the Reset Threshold Table in the datasheet and corresponds to the "S" suffix. It is specifically optimized for monitoring +3.0V power rails with adequate hysteresis to prevent chatter during slow VCC ramps.
Does the MAX823SEUK-T include a watchdog timer, and what is its timeout period?
Yes, the MAX823SEUK-T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer is cleared by any rising or falling edge on the WDI pin and automatically triggers a reset if no transition occurs within that window. This behavior is confirmed in the Electrical Characteristics table and Functional Diagram of the MAX823/MAX824/MAX825 datasheet.
Can the MAX823SEUK-T operate reliably at VCC = 1V, and what does that mean for system design?
Yes, the MAX823SEUK-T guarantees correct RESET output state (active-low assertion) down to VCC = 1V. This means the device continues supervising the microprocessor during deep brownout conditions, allowing controlled state preservation and safe shutdown - a key requirement for automotive and industrial systems where power collapse must be managed deterministically.
What is the function of the MR pin on the MAX823SEUK-T, and does it require an external pull-up resistor?
The MR pin on the MAX823SEUK-T is an active-low manual reset input with an internal 52kΩ pull-up resistor to VCC. No external pull-up is required - MR can be driven directly by CMOS logic, connected to ground via a momentary switch, or left open if unused. The datasheet confirms this internal pull-up value and specifies 1µs minimum pulse width for reliable reset assertion.
Is the MAX823SEUK-T pin-compatible with other members of the MAX823/MAX824/MAX825 family?
Yes, the MAX823SEUK-T shares identical SOT23-5 pinout and pin functions with all MAX823 variants (e.g., MAX823LEUK-T, MAX823TEUK-T) and is also pin-compatible with MAX824 and MAX825 in the same package. However, functional differences exist: MAX824 adds active-high RESET, MAX825 replaces WDI with active-high RESET, so substitution requires verification of required features beyond pin mapping.
MAX823SEUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX823SEUK-T FAQ
1.How can I place an order for MAX823SEUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823SEUK-T 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 MAX823SEUK-T reliable?
The price and inventory of MAX823SEUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823SEUK-T is usually 5 days.
3.What payment methods are accepted for MAX823SEUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823SEUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823SEUK-T?
MAX823SEUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823SEUK-T 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 MAX823SEUK-T?
For technical support, including MAX823SEUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823SEUK-T requirements.
6.How does Aetrix verify that MAX823SEUK-T is sourced from the original manufacturer or authorized distributors?
All MAX823SEUK-T 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 MAX823SEUK-T meets industry standards.
7.What is the process for return or replacement of MAX823SEUK-T?
All MAX823SEUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823SEUK-T, 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 MAX823SEUK-T part is unused and in its original packaging.
Return procedure for MAX823SEUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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