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Analog Devices Inc./Maxim Integrated MAX823LEUK+T
- Part No.:
- MAX823LEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823LEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,092
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Product details
Overview
MAX823LEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer, and manual reset input. It monitors +4.63V power supplies, guarantees RESET validity down to VCC = 1V, features 140ms min power-on reset timeout, and delivers 6µA operating current at -40°C to +125°C. It is used in automotive systems and critical µP monitoring where transient immunity and guaranteed low-voltage reset assertion are essential.
For engineers reviewing the MAX823LEUK+T datasheet, MAX823LEUK+T pinout, MAX823LEUK+T application, or MAX823LEUK+T equivalent, key selection criteria include reset threshold accuracy (4.63V ±7mV), watchdog timeout (1.6s), manual reset pulse handling (1µs minimum), internal MR pullup (52kΩ), and operation over extended temperature range (-40°C to +125°C).
Technical Context
The MAX823LEUK+T integrates a precision voltage comparator for reset generation, a 1.6s watchdog timer cleared by WDI edge transitions, and an internally pulled-up manual reset input. Its reset output remains valid during VCC decay to 1V and asserts for ≥140ms after VCC exceeds 4.63V.
It employs BiCMOS process technology (607 transistors) and is designed for immunity to fast VCC transients-reset is not triggered by negative-going glitches below defined overdrive/duration thresholds per Typical Operating Characteristics graphs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±7mV at +25°C; ensures reliable reset assertion for +5V systems with brownout detection |
| Reset Timeout | 140–280ms; guarantees µP initialization time before release, even under temperature variation |
| Watchdog Timeout | 1.12–2.40s; provides fail-safe software execution monitoring with 1.6s typical period |
| Supply Current | 6µA max (SOT23); enables ultra-low-power operation in battery-powered equipment |
| Operating Temp | -40°C to +125°C; supports automotive under-hood and industrial embedded environments |
| VCC Range | +4.75V to +5.5V; matches standard +5V rail tolerances without external regulation |
| MR Pullup | 52kΩ internal; eliminates external resistor for manual reset switch interface |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, tape-and-reel (2500 pcs/reel), footprint compatible with industry-standard SOT23-5 layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset output | Asserts low for ≥140ms on power-up/brownout/MR/WDI timeout; sinks 3.2mA, sources 800µA |
| 2 (GND) | Ground reference | Common return path for all internal circuits; requires low-impedance PCB connection |
| 3 (WDI) | Watchdog input | Edge-sensitive; clears 1.6s timer on rising/falling transition; disabled if left floating or high-Z |
| 4 (MR) | Manual reset input | Active-low; internal 52kΩ pullup; asserts reset for ≥1µs pulse; debounced internally |
| 5 (VCC) | Power supply input | Operates from +4.75V to +5.5V; reset valid down to 1V; requires 0.1µF local bypass |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET down to VCC = 1V | Ensures deterministic reset state during deep brownout or battery sag in portable systems |
| 140ms min power-on reset | Meets µP reset timing requirements without external RC network or timing component |
| Watchdog with 1.6s timeout | Provides autonomous system recovery from software lockup without host CPU intervention |
| Internal MR pullup (52kΩ) | Reduces BOM count and PCB area; supports direct switch-to-ground manual reset |
| VCC transient immunity | Rejects short-duration negative glitches (e.g., <1µs at 100mV overdrive), preventing spurious resets |
Applications
| Automotive Engine Control Unit | Industrial PLC Controller |
|---|---|
Use Scenario: Monitors main 5V supply in ECU under wide temperature and vibration conditions. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to MCU during cold cranking (VCC dip to ~1.5V) and EMI-induced transients. Use Value: Prevents erratic MCU behavior during engine start-stop cycles by guaranteeing RESET remains asserted until VCC stabilizes above 4.63V. | Use Scenario: Embedded controller in factory automation system with long cable runs and noisy 24V-derived 5V rails. IC Role / Device Role / Timing Role: Provides both power-on reset and manual reset via front-panel pushbutton, plus watchdog supervision of real-time task scheduler. Use Value: Eliminates need for external debounce components and discrete reset ICs, reducing failure points in safety-critical control logic. |
| Portable Medical Monitor | Battery-Powered Data Logger |
Use Scenario: Low-power patient vital sign monitor powered by Li-ion battery with buck-boost regulator outputting 5V. IC Role / Device Role / Timing Role: Resets microcontroller when battery voltage drops below safe operating level or during wake-from-sleep transitions. Use Value: 6µA quiescent current extends battery life; 1V reset validity ensures clean restart even as battery discharges to endpoint. | Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes using intermittent 5V boost converter. IC Role / Device Role / Timing Role: Supervises 5V rail generated by boost converter; triggers reset if converter fails or µC hangs during sleep/wake cycle. Use Value: Watchdog timeout (1.6s) catches firmware stalls before data corruption occurs; manual reset allows field technician recovery without power cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823MEUK+T | 4.38V reset threshold; identical pinout, package, and temperature range (-40°C to +125°C) | Suitable for +3.3V/3.6V systems with tighter tolerance margins; not interchangeable in +5V designs requiring 4.63V trip point | Select only if system VCC nominal is ≤4.5V and brownout margin must trigger earlier than 4.63V |
| TPS3808G33DBVR | 3.3V reset threshold; 350ms reset timeout; 2.5µA IQ; SOT23-5; -40°C to +125°C | Lacks watchdog and manual reset inputs; intended for simpler reset-only applications without system-level fault recovery | Choose when watchdog and MR functions are unnecessary and lower IQ or different threshold is prioritized |
Compared with MAX823LEUK+T, MAX823MEUK+T offers earlier reset assertion for lower-voltage rails but sacrifices compatibility in 5V systems, while TPS3808G33DBVR reduces power consumption and simplifies design at the cost of losing watchdog and manual reset capabilities required for robust embedded recovery.
Availability
MAX823LEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823LEUK+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX823 family was designed specifically for microprocessor supervisory functions in harsh environments-delivering precise reset thresholds, watchdog safety monitoring, and manual reset capability in minimal 5-pin SOT23 form factor.
FAQ
What is the exact reset threshold voltage for MAX823LEUK+T and how tightly is it specified?
The MAX823LEUK+T has a nominal reset threshold of 4.63V, with a guaranteed tolerance of ±7mV at +25°C and ±10mV over full temperature range (-40°C to +125°C). This specification is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, ensuring accurate brownout detection for +5V systems without external calibration.
Does MAX823LEUK+T support operation down to 1V VCC, and what does that mean for system reliability?
Yes, MAX823LEUK+T guarantees correct RESET output state (low) for VCC down to 1V, meaning it continues asserting reset even during severe brownout or battery sag conditions. This ensures the connected microprocessor remains held in reset until power recovers sufficiently-critical for preventing undefined states or flash corruption in automotive and portable applications where MAX823LEUK+T is deployed.
How does the watchdog function work in MAX823LEUK+T, and what is its timeout behavior?
The MAX823LEUK+T watchdog timer has a nominal timeout of 1.6 seconds, with a guaranteed range of 1.12s to 2.40s over temperature. It is cleared by any rising or falling edge on the WDI pin. If no edge occurs within the timeout window, RESET is asserted. The timer is automatically disabled if WDI is left unconnected or driven high-impedance, making MAX823LEUK+T adaptable to systems where watchdog functionality may be optional.
Can MAX823LEUK+T be used with microcontrollers that have bidirectional reset pins, and how is this supported?
Yes, MAX823LEUK+T supports bidirectional reset interfaces like those found on 68HC11-family MCUs. Its RESET output can source up to 800µA (L/M versions), allowing the µP to actively pull RESET low when needed-even while MAX823LEUK+T is driving it high. This bidirectional compatibility eliminates contention and enables safe, standards-compliant reset signaling without external logic in mixed-direction reset architectures.
What is the internal pullup value on the MR pin of MAX823LEUK+T, and why does it matter for circuit design?
The MR pin of MAX823LEUK+T includes an internal 52kΩ pullup resistor (typical), with a guaranteed range of 35kΩ to 75kΩ. This eliminates the need for an external pullup resistor, simplifying PCB layout and reducing BOM count. It allows direct connection of a momentary switch between MR and GND-no external components required-making MAX823LEUK+T ideal for space-constrained and cost-sensitive designs such as handheld instruments and battery-powered sensors.
MAX823LEUK+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:
- 4.63V
- 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
MAX823LEUK+T FAQ
1.How can I place an order for MAX823LEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823LEUK+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 MAX823LEUK+T reliable?
The price and inventory of MAX823LEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823LEUK+T is usually 5 days.
3.What payment methods are accepted for MAX823LEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823LEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823LEUK+T?
MAX823LEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823LEUK+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 MAX823LEUK+T?
For technical support, including MAX823LEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823LEUK+T requirements.
6.How does Aetrix verify that MAX823LEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX823LEUK+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 MAX823LEUK+T meets industry standards.
7.What is the process for return or replacement of MAX823LEUK+T?
All MAX823LEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823LEUK+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 MAX823LEUK+T part is unused and in its original packaging.
Return procedure for MAX823LEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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