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Analog Devices Inc./Maxim Integrated MAX823REUK+T
- Part No.:
- MAX823REUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823REUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
The MAX823REUK+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 reliable power-on/brownout monitoring of +2.63V supplies in industrial and automotive systems. It guarantees RESET validity down to VCC = 1V, features 140ms min reset timeout, and draws only 3µA typical supply current at +125°C.
For engineers reviewing the MAX823REUK+T datasheet, MAX823REUK+T pinout, MAX823REUK+T application, or MAX823REUK+T equivalent, key selection criteria include its -40°C to +125°C operating range, 2.63V reset threshold, integrated watchdog with edge-triggered clearing, internal MR pullup (52kΩ), and immunity to fast VCC transients.
Technical Context
The MAX823REUK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to monitor VCC against a factory-trimmed 2.63V threshold. Its reset generator asserts an active-low open-drain RESET output for ≥140ms after power-up or brownout recovery, with propagation delay under 20µs.
The integrated watchdog timer clears on any WDI edge (rising or falling) and times out after 1.6s if unrefreshed; it is disabled when WDI is left floating or three-stated. The manual reset input (MR) features internal 52kΩ pullup and triggers reset on logic-low assertion, holding reset for 200ms after MR returns high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±30mV - precisely monitors +2.7V to +3.6V supplies without external components |
| Reset Timeout | 140–280ms - ensures µP initialization completes before release, even during slow-ramp power-up | Watchdog Timeout | 1.6s nominal - detects software hangs in embedded firmware loops with minimal overhead |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Temp | -40°C to +125°C - supports under-hood automotive and industrial control environments |
| VCC Range | +2.7V to +3.6V - matches standard 3.3V rail tolerances while maintaining reset validity down to 1V |
| RESET Validity | Guaranteed to VCC = 1V - prevents spurious release during deep brownout or backup-battery switchover |
Pinout & Package
MAX823REUK+T uses the 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal performance in high-temp applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain reset output | Drives µP reset pin low during power-up, brownout, or watchdog/MR event; sinks up to 3.2mA |
| 2 (GND) | Ground reference | Common return path for all internal circuits; must be low-impedance for noise immunity |
| 3 (WDI) | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents reset; floating disables watchdog |
| 4 (MR) | Manual reset input | Active-low input with internal 52kΩ pullup; debounced internally-no external RC needed |
| 5 (VCC) | Supply voltage input | Accepts +2.7V to +3.6V; powers all functions and enables reset assertion down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.63V threshold | Eliminates need for external resistor dividers or calibration in +2.7V system designs |
| 1.6s edge-triggered watchdog | Enables robust firmware supervision without requiring precise timing or periodic pulses |
| Internal MR pullup (52kΩ) | Reduces BOM count by removing external pullup; supports direct switch-to-ground interface |
| VCC transient immunity | Rejects sub-µs negative glitches on supply rail-prevents false resets in noisy environments |
| 1V reset validity | Ensures deterministic reset behavior during backup battery handover or deep undervoltage events |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in under-hood ECU exposed to wide temperature swings and load-dump transients. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog supervision for safety-critical firmware execution. Use Value: Guarantees reset assertion down to VCC = 1V during cranking, prevents false resets from 100ns VCC glitches, and operates reliably at +125°C ambient. | Use Scenario: Ensuring deterministic startup and runtime integrity of ARM-based controller in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Reset supervisor with manual reset capability for field service and watchdog timer for firmware hang detection. Use Value: Internal 52kΩ MR pullup eliminates external component; 140ms reset timeout aligns with FPGA configuration time; 3µA quiescent current extends backup battery life. |
| Portable Medical Diagnostic Devices | Battery-Powered Smart Sensors |
Use Scenario: Power management in handheld ultrasound or glucose meter where battery voltage drops near end-of-life. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring µP remains held in reset until stable 2.63V+ supply is established. Use Value: 2.63V threshold matches Li-ion battery discharge curve; 1V reset validity prevents premature release during deep discharge recovery. | Use Scenario: Long-life IoT sensor node powered by coin cell, requiring decades of unattended operation with firmware watchdog. IC Role / Device Role / Timing Role: Low-power supervisory IC providing both power-on reset and software hang detection via WDI edge sensing. Use Value: 3µA supply current minimizes battery drain; 1.6s watchdog timeout balances responsiveness and power savings; no external components reduce leakage paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SEUK+T | 2.93V reset threshold; identical pinout, package, and feature set | Targeted at +3.0V supply rails instead of +2.7V systems | Select when monitoring 3.0V logic rails-same layout, no PCB changes required |
| TPS3808G12DBVR | 2.93V threshold; 350ms reset timeout; 1.5µA supply current; no watchdog or MR | Lacks watchdog timer and manual reset-suitable only for basic reset-only applications | Choose for ultra-low-power, reset-only use cases where watchdog/MR are unnecessary |
Compared with MAX823REUK+T, MAX823SEUK+T offers identical functionality at a higher reset threshold for 3.0V systems, while TPS3808G12DBVR reduces power consumption but omits critical watchdog and manual reset capabilities required for robust embedded firmware supervision.
Availability
MAX823REUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and portable medical diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823REUK+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX823 family is designed specifically for microprocessor supervision in harsh environments-delivering precision reset thresholds, watchdog timers, and manual reset inputs in ultra-small 5-pin packages for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX823REUK+T?
The MAX823REUK+T has a factory-trimmed reset threshold of 2.63V, specified over temperature with ±30mV tolerance (min 2.55V, max 2.70V at TMIN to TMAX). This value is laser-trimmed during production and applies directly to the R-suffix variant, enabling accurate monitoring of +2.7V supply rails without external components.
Does the MAX823REUK+T support watchdog functionality, and how is it triggered?
Yes, the MAX823REUK+T includes a watchdog timer with a nominal 1.6s timeout period. It is triggered when the WDI pin remains static (high or low) beyond that interval. The timer clears on any rising or falling edge at WDI-making it edge-sensitive rather than level-sensitive-and is automatically disabled if WDI is left floating or driven by a three-stated output.
Can the MAX823REUK+T operate reliably at +125°C ambient temperature?
Yes, the MAX823REUK+T is fully specified for operation from -40°C to +125°C ambient temperature in the SOT23-5 package. Its electrical characteristics-including reset threshold accuracy, supply current (3µA typical), and reset timeout-are guaranteed across this full range, making it suitable for under-hood automotive and industrial control applications.
What is the function of the MR pin on the MAX823REUK+T, and does it require an external pullup?
The MR pin on the MAX823REUK+T is an active-low manual reset input that asserts RESET when pulled low. It includes an internal 52kΩ pullup resistor, so no external pullup is required-MR can be left unconnected, tied to VCC, or driven by CMOS logic or a momentary switch to GND. Reset remains asserted for 200ms after MR returns high.
How does the MAX823REUK+T ensure reset validity during deep brownout conditions?
The MAX823REUK+T guarantees RESET remains valid (correct logic state) down to VCC = 1V, meaning it continues asserting reset even as supply voltage collapses. This ensures the microprocessor stays held in reset during deep brownout or backup battery switchover events-critical for preventing undefined behavior or memory corruption in safety-critical systems.
MAX823REUK+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:
- 2.63V
- 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
MAX823REUK+T FAQ
1.How can I place an order for MAX823REUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823REUK+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 MAX823REUK+T reliable?
The price and inventory of MAX823REUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823REUK+T is usually 5 days.
3.What payment methods are accepted for MAX823REUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823REUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823REUK+T?
MAX823REUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823REUK+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 MAX823REUK+T?
For technical support, including MAX823REUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823REUK+T requirements.
6.How does Aetrix verify that MAX823REUK+T is sourced from the original manufacturer or authorized distributors?
All MAX823REUK+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 MAX823REUK+T meets industry standards.
7.What is the process for return or replacement of MAX823REUK+T?
All MAX823REUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823REUK+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 MAX823REUK+T part is unused and in its original packaging.
Return procedure for MAX823REUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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