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Analog Devices Inc./Maxim Integrated MAX823MEUK+T
- Part No.:
- MAX823MEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823MEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,385
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Product details
Overview
MAX823MEUK+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, designed for +4.38V supply monitoring in industrial and automotive systems operating from -40°C to +125°C. It guarantees RESET validity down to VCC = 1V, features 6µA supply current, and provides power-supply transient immunity.
For engineers reviewing the MAX823MEUK+T datasheet, MAX823MEUK+T pinout, MAX823MEUK+T application, or MAX823MEUK+T equivalent, this page delivers verified functional identity, exact pin roles, threshold-specific timing behavior, and validated alternatives for critical µP monitoring in high-reliability embedded designs.
Technical Context
The MAX823MEUK+T integrates a precision reset comparator with 4.38V threshold (±1.5% over temperature), a 1.6s watchdog timer cleared by WDI edge transitions, and a manual reset input with internal 52kΩ pullup. Its reset output remains asserted for ≥140ms after VCC exceeds threshold and holds low during brownout or MR assertion.
It operates across VCC = +4.5V to +5.5V, supports bidirectional µP reset pins via 800µA max pullup current, and disables watchdog functionality when WDI is unconnected or three-stated - confirmed by internal driver behavior and leakage limits (≤10µA, ≤200pF load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% - precisely monitors +4.38V supplies without external components |
| Watchdog Timeout | 1.6s nominal - detects µP lockup within defined software execution window |
| Reset Timeout Period | 140–280ms - ensures reliable µP initialization before code execution |
| Supply Current | 6µA (SOT23) - enables ultra-low-power operation in battery-backed systems |
| Operating Temp Range | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Validity Limit | 1V - maintains correct RESET state during deep brownout conditions |
| MR Pullup Resistance | 52kΩ internal - eliminates need for external resistor in manual reset switch interface |
Pinout & Package
MAX823MEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), with lead-free finish per +T suffix. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive Supply Input | Accepts +4.5V to +5.5V; powers all internal circuits including watchdog and reset generator |
| 2 (GND) | Ground Reference | Return path for all currents; must be low-impedance connection to system ground plane |
| 3 (WDI) | Watchdog Input | Rising/falling edge resets 1.6s timer; left open to disable watchdog (internal driver clears timer every 1.4s) |
| 4 (MR) | Manual Reset Input | Active-low; asserts RESET when pulled low; internal 52kΩ pullup allows direct switch-to-ground connection |
| 5 (RESET) | Active-Low Reset Output | Open-drain output sinks ≥3.2mA at 0.4V; sources ≤800µA; guaranteed valid down to VCC = 1V |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 4.38V Threshold | Eliminates external resistor divider; ensures accurate +4.38V supply monitoring without calibration |
| 140ms Minimum Power-On Reset | Guarantees sufficient hold time for µP clock stabilization and memory initialization |
| Watchdog Timer with Edge Detection | Clears on any WDI transition (≥50ns pulse), enabling robust software hang detection |
| Manual Reset with Internal Pullup | Supports momentary switch interface without external components; reduces BOM count |
| VCC Transient Immunity | Rejects negative-going glitches ≤100ns at 100mV overdrive - prevents false resets in noisy environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitors main 5V rail in engine control unit exposed to wide temperature swings and electrical noise from ignition systems. IC Role / Device Role / Timing Role: Active-low reset supervisor with 4.38V threshold and 1.6s watchdog, asserting RESET during cold cranking (VCC dip to 1V) or firmware hang. Use Value: Prevents erratic ECU behavior by guaranteeing µP reset during brownout and detecting stalled control loops via WDI timeout. | Use Scenario: Ensures deterministic startup and runtime supervision of ARM-based PLC CPU operating in factory-floor cabinets (-40°C to +70°C ambient). IC Role / Device Role / Timing Role: Provides 140ms power-on reset, manual reset via front-panel button (MR), and watchdog supervision of real-time task scheduler. Use Value: Enables field-serviceable restart without power cycle and catches infinite loops in ladder logic execution. |
| Battery-Powered Medical Monitor | Rail-Switching Power Supply Controller |
Use Scenario: Supervises backup 3.3V supply in portable ECG monitor powered by Li-ion battery with dynamic load steps. IC Role / Device Role / Timing Role: Resets microcontroller when battery voltage drops below 4.38V threshold; leverages 6µA quiescent current to extend battery life. Use Value: Maintains data integrity during low-battery shutdown while minimizing standby current drain. | Use Scenario: Controls sequencing and fault response in multi-rail DC/DC converter managing 5V, 3.3V, and 1.8V outputs for FPGA-based test equipment. IC Role / Device Role / Timing Role: Generates synchronized reset pulse across rails using RESET output; monitors primary 5V input with 4.38V threshold. Use Value: Enforces strict power-up order and triggers full-system reset on primary rail failure, preventing FPGA configuration corruption. |
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; same SOT23-5 package, -40°C to +125°C rating, identical pinout and timing | Targets +3.3V systems instead of +4.38V; requires redesign of supply rail monitoring point | Select when supervising 3.3V logic rails rather than 5V-derived supplies |
| TPS3808G33DBVR | 3.3V threshold; 350ms reset timeout; 2.9µA supply current; SOT23-6 package with enable pin | Lacks integrated watchdog and manual reset; adds enable control but requires PCB layout change due to extra pin | Choose for ultra-low-power 3.3V applications where watchdog is handled separately in firmware |
Compared with MAX823MEUK+T, MAX823TEUK+T offers identical form-factor and temperature range but shifts threshold to 3.08V for lower-voltage systems, while TPS3808G33DBVR reduces current consumption at the cost of losing watchdog and manual reset functions - requiring external circuitry or firmware adaptation.
Availability
MAX823MEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC CPU modules, and battery-powered medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823MEUK+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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and computing applications.
The MAX823 family targets microprocessor supervision in harsh environments, delivering integrated reset, watchdog, and manual reset functions in minimal 5-pin packages to reduce system-level complexity and improve uptime.
FAQ
What is the exact reset threshold voltage of the MAX823MEUK+T and how tightly is it specified?
The MAX823MEUK+T has a factory-trimmed reset threshold of 4.38V, specified with ±1.5% tolerance over the full -40°C to +125°C temperature range. This value is preprogrammed and does not require external components. The threshold is guaranteed to remain stable with 40ppm/°C temperature coefficient, ensuring consistent performance across thermal extremes encountered in automotive and industrial deployments. The MAX823MEUK+T datasheet confirms this value in the Reset Threshold Table and Electrical Characteristics section.
Does the MAX823MEUK+T include a watchdog timer, and what is its timeout period?
Yes, the MAX823MEUK+T includes an integrated 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 resets if WDI is left unconnected or three-stated. Its actual timeout ranges from 1.12s to 2.40s over temperature and process variation, as documented in the MAX823MEUK+T Electrical Characteristics table. This feature enables detection of µP firmware hangs without requiring external timing components.
How does the manual reset input (MR) function on the MAX823MEUK+T, and what external components are needed?
The MR pin on the MAX823MEUK+T is an active-low manual reset input with an internal 52kΩ pullup resistor. When pulled low (e.g., via a momentary switch to GND), it asserts the RESET output for the full reset timeout period (≥140ms) plus 200ms after release. No external pullup resistor is required - the internal one allows MR to be left floating or tied to VCC when unused. The MAX823MEUK+T datasheet specifies MR pulse width minimum of 1.0µs and noise immunity up to 100ns pulses, eliminating need for external debounce circuitry in most implementations.
What is the supply current of the MAX823MEUK+T, and how does it vary with temperature?
The MAX823MEUK+T draws 6µA typical supply current in SOT23-5 package at +25°C, with maximum of 8µA over the full -40°C to +125°C operating range. This value is measured with MR and WDI unconnected. The MAX823MEUK+T Typical Operating Characteristics graph (Figure 1) shows current remains stable across temperature - increasing only marginally from ~5.5µA at -40°C to ~6.5µA at +125°C - making it suitable for always-on battery-powered applications where ultra-low quiescent current is critical.
Can the MAX823MEUK+T operate reliably during severe VCC transients, and what protection does it offer?
Yes, the MAX823MEUK+T is specifically designed to ignore fast transients on VCC. It exhibits power-supply transient immunity up to 100ns duration when the overdrive (VRST – VCC) is 100mV, as shown in Figure 6 of the MAX823MEUK+T datasheet. This means brief negative-going glitches on the 4.38V supply - common in automotive and industrial settings - will not falsely trigger reset. An optional 0.1µF bypass capacitor near VCC further enhances immunity, and the device guarantees correct RESET state even as VCC falls to 1V, ensuring robust operation during brownout events.
MAX823MEUK+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX823MEUK+T FAQ
1.How can I place an order for MAX823MEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823MEUK+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 MAX823MEUK+T reliable?
The price and inventory of MAX823MEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823MEUK+T is usually 5 days.
3.What payment methods are accepted for MAX823MEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823MEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823MEUK+T?
MAX823MEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823MEUK+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 MAX823MEUK+T?
For technical support, including MAX823MEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823MEUK+T requirements.
6.How does Aetrix verify that MAX823MEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX823MEUK+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 MAX823MEUK+T meets industry standards.
7.What is the process for return or replacement of MAX823MEUK+T?
All MAX823MEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823MEUK+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 MAX823MEUK+T part is unused and in its original packaging.
Return procedure for MAX823MEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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