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Analog Devices Inc./Maxim Integrated MAX824LEUK
- Part No.:
- MAX824LEUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Unclassified
- Package:
- Datasheet:
-
MAX824LEUK.pdf
- Description:
- IC MPU SPRVSR CIRC WDT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:867
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Product details
Overview
MAX824LEUK from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low watchdog input, complementary active-high reset output, and precision +4.63V supply monitoring. It guarantees RESET validity down to VCC = 1V, delivers 140ms minimum power-on reset timeout, and provides 1.6s watchdog timeout. It is used in automotive systems and critical µP monitoring where transient immunity and extended temperature operation are required.
For engineers reviewing the MAX824LEUK datasheet, MAX824LEUK pinout, MAX824LEUK application, or MAX824LEUK equivalent, this page details its reset threshold hysteresis (10mV), supply current (3–8µA at +25°C), operating temperature range (–40°C to +125°C), watchdog pulse width tolerance (50ns), and MR noise immunity (100ns) - all confirmed for the SOT23-5 package and L-suffix variant.
Technical Context
The MAX824LEUK integrates a precision reset comparator with 4.63V threshold (±0.7% over temperature), a 1.6s watchdog timer cleared by WDI edge transitions, and dual-reset outputs (active-low RESET and active-high RESET). Its BiCMOS process enables guaranteed operation down to VCC = 1V and supports bidirectional µP reset interfaces with 800µA max pullup current.
It features internal 52kΩ MR pullup, 40ppm/°C reset threshold temperature coefficient, and immunity to fast VCC transients via hysteresis and propagation delay control. The device operates across –40°C to +125°C without external components and disables watchdog functionality when WDI is left unconnected or three-stated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±0.7% - sets precise brownout detection point for +5V systems |
| Watchdog Timeout | 1.6s nominal - ensures software hangs trigger system reset within defined interval |
| Reset Timeout Period | 140–280ms - holds µP in reset long enough for stable power rail settling |
| Supply Current | 3–8µA at +25°C - enables ultra-low-power operation in battery-backed applications |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Range | +4.75V to +5.5V - matches standard 5V logic and regulator output tolerances |
| Reset Propagation Delay | 20µs at VCC falling - ensures rapid response to supply collapse without false triggering |
Pinout & Package
MAX824LEUK is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and lead-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥140ms on power-up/brownout; remains valid down to VCC = 1V |
| 2 - GND | Ground reference | Common return path for internal comparators, watchdog, and reset generator |
| 3 - WDI | Watchdog input | Edge-sensitive input; resets 1.6s timer on rising/falling transition; disabled if floating |
| 4 - RESET | Active-high reset output | Complementary to pin 1; enables direct interface to µPs requiring active-high reset |
| 5 - VCC | Power supply input | Accepts +4.75V to +5.5V; powers all internal circuitry including reset comparator and watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity to VCC = 1V | Ensures reliable reset assertion during deep brownout or backup-battery switchover |
| 1.6s watchdog timeout with 50ns pulse detection | Supports robust firmware supervision even with very short software-triggered pulses |
| 4.63V reset threshold with 10mV hysteresis | Prevents chatter during slow VCC recovery near threshold; optimized for +5V rails |
| No external components required | Reduces BOM count and PCB area; eliminates calibration or timing resistor dependencies |
| Power-supply transient immunity | Rejects sub-µs negative VCC glitches up to 200µs duration (at 100mV overdrive) |
Applications
| Automotive Engine Control Units | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in under-hood ECU exposed to wide thermal cycling and load-dump transients. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and watchdog supervision of main MCU. Use Value: Guarantees safe MCU initialization and recovery from voltage sags down to 1V, with 125°C operation and transient immunity per ISO 7637-2. | Use Scenario: Ensuring deterministic startup and fault recovery in modular programmable logic controllers with field I/O modules. IC Role / Device Role / Timing Role: Dual-output reset supervisor enabling both active-low and active-high reset signaling to mixed-logic subsystems. Use Value: Eliminates need for external inverters; 140ms reset timeout meets IEC 61131-2 cold-start requirements for safety-critical control loops. |
| Medical Diagnostic Handhelds | Ruggedized Data Loggers |
Use Scenario: Battery-powered portable ultrasound or ECG units requiring low-quiescent-current supervision during standby and wake-up cycles. IC Role / Device Role / Timing Role: Low-power (3–8µA) supervisory IC managing µP reset and watchdog during intermittent sensor acquisition bursts. Use Value: Extends battery life while maintaining fail-safe reset behavior; 4.63V threshold aligns with LDO-regulated 5V analog front-end supplies. | Use Scenario: Remote environmental monitoring nodes deployed in extreme ambient conditions (-40°C to +85°C operational, +125°C storage). IC Role / Device Role / Timing Role: High-temperature qualified supervisor ensuring reliable µP boot and runtime watchdog coverage in sealed enclosures. Use Value: Qualified to +125°C junction temperature; no derating required for enclosure heating; SC70/SOT23 footprint supports compact conformal-coated layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824MEUK | 4.38V reset threshold; otherwise identical pinout, timing, and temperature rating | Suitable for +5V systems with tighter supply tolerance or lower dropout margin | Select when VCC nominal is 4.75V–5.0V and brownout margin must be reduced relative to MAX824LEUK |
| TPS3808G33DBVR | 3.3V reset threshold; 350ms reset timeout; 2.5–6V VCC range; no watchdog input | Used in 3.3V µP systems without watchdog requirement; lacks WDI and complementary reset | Choose only if watchdog and dual-reset outputs are unnecessary and 3.3V monitoring is primary need |
Compared with MAX824LEUK, MAX824MEUK offers lower reset voltage for tighter 5V rail margins but identical watchdog, temperature, and package specs; TPS3808G33DBVR provides longer reset timeout and wider VCC range but omits watchdog and active-high reset - making it unsuitable for applications requiring those functions.
Availability
MAX824LEUK is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824LEUK 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 industrial, automotive, communications, and computing markets.
The MAX823/MAX824/MAX825 family was engineered specifically for microprocessor supervision in harsh environments - delivering precision reset thresholds, integrated watchdog timers, and extended temperature operation in minimal 5-pin packages.
FAQ
What is the reset threshold voltage of the MAX824LEUK and how tightly is it specified?
The MAX824LEUK has a factory-trimmed reset threshold of 4.63V, specified with ±0.7% accuracy over the full –40°C to +125°C temperature range. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet. The device also provides 10mV hysteresis to prevent oscillation during slow VCC recovery. This precision enables reliable brownout detection in +5V systems without external calibration.
Does the MAX824LEUK support both active-low and active-high reset outputs simultaneously?
Yes, the MAX824LEUK provides two independent reset outputs: pin 1 (RESET) is active-low, and pin 4 (RESET) is active-high - they are true complements. This allows direct interfacing to microprocessors or FPGAs that require either polarity without external inverters. Both outputs are guaranteed functional down to VCC = 1V and share the same 140ms minimum reset timeout period. The dual-output capability is explicitly documented in the Selector Guide and Pin Description sections for the MAX824 series.
What is the watchdog timeout period of the MAX824LEUK and how is it triggered?
The MAX824LEUK features a 1.6s nominal watchdog timeout period, with a guaranteed range of 1.12s to 2.40s over temperature. It is triggered when the WDI input (pin 3) remains static - either high or low - beyond this interval. The timer clears on any rising or falling edge at WDI, or when reset is asserted. If WDI is left unconnected, the internal driver disables the watchdog function by servicing the timer every ~1.4s. This behavior is verified in the Electrical Characteristics and Detailed Description sections of the datasheet.
Can the MAX824LEUK operate reliably at 125°C junction temperature?
Yes, the MAX824LEUK is fully specified and production-tested for continuous operation from –40°C to +125°C ambient temperature in the SOT23-5 package. Its electrical parameters - including reset threshold, supply current, and watchdog timeout - are guaranteed across this range per the Absolute Maximum Ratings and Electrical Characteristics tables. The "EUK" suffix explicitly denotes the +125°C grade, and thermal derating data confirms 571mW power dissipation capability at +70°C with 7.1mW/°C derating above that point.
Is there an internal pullup resistor on the manual reset input of the MAX824LEUK?
No - the MAX824LEUK does not include a manual reset (MR) input. That function is exclusive to the MAX823 and MAX825 variants. The MAX824LEUK's pin 3 is dedicated to the watchdog input (WDI), and its pin 4 is the active-high reset output. This functional distinction is clearly shown in the Selector Guide and Pin Configurations diagrams. Attempting to drive MR functionality on MAX824LEUK will not produce reset assertion, as the MR circuitry is physically absent from the die.
MAX824LEUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
MAX824LEUK FAQ
1.How can I place an order for MAX824LEUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824LEUK 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 MAX824LEUK reliable?
The price and inventory of MAX824LEUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824LEUK is usually 5 days.
3.What payment methods are accepted for MAX824LEUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824LEUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824LEUK?
MAX824LEUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824LEUK 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 MAX824LEUK?
For technical support, including MAX824LEUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824LEUK requirements.
6.How does Aetrix verify that MAX824LEUK is sourced from the original manufacturer or authorized distributors?
All MAX824LEUK 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 MAX824LEUK meets industry standards.
7.What is the process for return or replacement of MAX824LEUK?
All MAX824LEUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX824LEUK, 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 MAX824LEUK part is unused and in its original packaging.
Return procedure for MAX824LEUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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