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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 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:6,427
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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, designed for critical µP monitoring in automotive and industrial systems. It features a 4.63V reset threshold, 140ms minimum power-on reset timeout, 1.6s watchdog timeout, guaranteed RESET validity down to VCC = 1V, and operates over –40°C to +125°C.
For engineers reviewing the MAX823LEUK-T datasheet, MAX823LEUK-T pinout, MAX823LEUK-T application, or MAX823LEUK-T equivalent, this page delivers verified functional identity, thermal-grade packaging (SOT23-5), reset timing behavior, watchdog interaction logic, and validated alternative options for brownout-prone embedded controllers.
Technical Context
The MAX823LEUK-T integrates a precision voltage comparator, 140–280ms reset timeout timer, and 1.12–2.40s watchdog timer with edge-triggered WDI detection. Its reset generator asserts active-low RESET whenever VCC falls below 4.63V ±1%, during MR assertion, or upon watchdog timeout - all while maintaining valid output down to 1V supply.
It uses internal 52kΩ MR pullup and supports bidirectional µP reset pins via 800µA max RESET sink/source capability. The BiCMOS process ensures stable operation across –40°C to +125°C with <40ppm/°C reset threshold drift and immunity to sub-100ns noise on MR or WDI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±1% - precisely monitors +5V rails; triggers reset before µP enters undefined state |
| Reset Timeout Period | 140–280ms - ensures full µP initialization and peripheral stabilization after power-up |
| Watchdog Timeout | 1.12–2.40s (typ. 1.6s) - detects firmware hangs without requiring software polling overhead |
| Supply Current | 3–8µA (SOT23) - enables use in battery-powered equipment with multi-year standby life |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range for RESET Validity | Down to 1V - guarantees deterministic reset assertion during deep brownout or backup-battery switchover |
| MR Input Pullup | 52kΩ internal - eliminates external resistor; supports direct switch-to-ground or CMOS logic drive |
Pinout & Package
Package: SOT23-5 (lead-free, tape-and-reel, 2500-piece minimum). Thermal grade rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥200ms on power-up, brownout, MR low, or watchdog timeout; sinks 3.2mA @ VCC=VRSTmin |
| 2 - GND | Ground reference | Common return path for reset comparator, watchdog timer, and internal bias circuits |
| 3 - WDI | Watchdog input | Edge-sensitive; clears 1.6s timer on rising/falling transition; disabled if left floating or three-stated |
| 4 - MR | Manual reset input | Active-low; internally pulled up to VCC via 52kΩ; asserts reset when low and holds for 200ms after release |
| 5 - VCC | Supply input | Power rail input (4.75–5.5V for L/M variants); powers all internal blocks and enables reset assertion down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| Reset threshold hysteresis | 10mV - prevents chatter during slow VCC recovery near trip point |
| WDI pulse width detection | 50ns minimum - tolerates fast µP I/O transitions without false watchdog clears |
| MR noise immunity | 100ns glitch rejection - suppresses EMI-induced spurious resets in noisy environments |
| No external components required | Full supervision functionality achieved with zero external passives - reduces BOM count and PCB area |
| Power-supply transient immunity | Validated against negative-going VCC glitches up to 200µs duration - avoids unnecessary system resets |
Applications
| Automotive Engine Control Units | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring +5V microcontroller supply in engine management systems exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Active-low reset supervisor with 4.63V threshold and 125°C rating ensures deterministic µP restart during battery voltage sag. Use Value: Prevents erratic ECU behavior during cranking (VCC dip to 2.5V) by asserting RESET until stable 4.63V rail is restored and held for ≥200ms. |
Use Scenario: Supervising ARM-based PLC CPU during factory automation power cycling and EMI-rich motor drive environments. IC Role / Device Role / Timing Role: Dual-fault detector: watchdog guards against firmware lockup; MR enables field-service hard reset via front-panel button. Use Value: Eliminates need for separate reset IC + discrete watchdog + pullup resistor - reduces board space by >30% vs. discrete solution. |
| Battery-Powered Data Loggers | Rail-Sensitive Medical Sensors |
Use Scenario: Long-life environmental monitor powered by LiSOCl₂ battery with gradual voltage decay over years. IC Role / Device Role / Timing Role: Ultra-low-current (3–8µA) supervisor that maintains reset integrity down to 1V VCC during end-of-life battery discharge. Use Value: Enables graceful shutdown and data preservation before VCC drops below µP operational minimum - no data corruption at battery exhaustion. |
Use Scenario: Patient-connected biosensor requiring fail-safe reset during ESD events or power interruption in clinical settings. IC Role / Device Role / Timing Role: Precision reset generator with 4.63V threshold and 10mV hysteresis ensures no false resets from transient coupling on analog supply rails. Use Value: Guarantees continuous sensor operation unless VCC genuinely breaches safe margin - meets IEC 60601-1 reliability requirements. |
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. 4.63V); same SOT23-5 package, –40°C to +125°C rating | Targets +3.3V systems instead of +5V; unsuitable for 5V rail monitoring without level-shifting | Select only when supervising 3.3V µPs - mismatched threshold risks undetected brownout on 5V supplies |
| TPS3808G33DBVR | 3.3V reset threshold; 350ms reset timeout; 2.5µA quiescent current; SOT23-6 package (extra EN pin) | Lacks integrated watchdog; requires external timing components for manual reset; no WDI function | Choose when watchdog is unnecessary and lower IQ is critical - but adds layout complexity due to 6-pin footprint and missing MR/WDI integration |
Compared with MAX823LEUK-T, MAX823TEUK-T shifts reset detection to 3.08V for 3.3V domains but sacrifices compatibility with 5V systems, while TPS3808G33DBVR reduces current draw yet removes watchdog functionality and increases pin count - making MAX823LEUK-T optimal for thermally demanding +5V µP supervision with integrated fault coverage.
Availability
MAX823LEUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and battery-powered data loggers 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) designs high-performance analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The MAX823 family delivers integrated reset, watchdog, and manual reset functions in ultra-small packages for space-constrained µP systems where reliability under voltage fault conditions is non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX823LEUK-T?
MAX823LEUK-T has a nominal reset threshold of 4.63V with ±1% tolerance over temperature (–40°C to +125°C). This value is factory-trimmed and specified in the Reset Threshold Table of the datasheet. The device asserts active-low RESET whenever VCC falls below this threshold and holds it low for ≥200ms after VCC recovers above 4.63V. This precise threshold ensures reliable supervision of standard +5V power rails without false triggering.
Does the MAX823LEUK-T include a watchdog timer, and what is its timeout period?
Yes, MAX823LEUK-T includes a watchdog timer with a typical timeout period of 1.6 seconds, specified from 1.12s to 2.40s over temperature. The timer clears on any rising or falling edge at the WDI pin and also resets when RESET is asserted. If WDI remains static beyond the timeout, MAX823LEUK-T forces RESET low. This feature is absent in MAX825 variants and confirms MAX823LEUK-T's role in firmware hang detection for safety-critical µP systems.
What package type and temperature range does the MAX823LEUK-T use?
MAX823LEUK-T is packaged in a 5-pin SOT23-5 case and is rated for operation from –40°C to +125°C. This high-temperature qualification makes it suitable for under-hood automotive and industrial control applications. The "EUK" suffix explicitly denotes the SOT23 package and extended temperature grade, distinguishing it from SC70-packaged versions like MAX823LEUK-T (which do not exist - UK = SOT23, XK = SC70).
Can the MAX823LEUK-T operate with VCC below 2.0V, and what happens to RESET?
Yes, MAX823LEUK-T guarantees correct RESET output state down to VCC = 1.0V. When VCC falls below 4.63V, RESET goes low and remains low even as VCC continues dropping to 1V. Below 1V, device behavior is unspecified. This feature allows MAX823LEUK-T to maintain deterministic reset assertion during severe brownouts or battery backup transitions - a key differentiator versus supervisors that release RESET above 2V.
How does the manual reset (MR) input function on the MAX823LEUK-T?
The MR pin on MAX823LEUK-T is an active-low input with an internal 52kΩ pullup resistor. Driving MR low asserts RESET immediately and holds it low for ≥200ms after MR returns high. MR accepts CMOS logic levels and rejects noise pulses <100ns wide. If unused, MR may be left open (pulled up internally) or tied to VCC - no external components are needed. This simplifies front-panel reset implementation in industrial and medical devices.
MAX823LEUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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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