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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 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:7,424
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Product details
Overview
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 +2.63V supply monitoring in automotive and industrial systems operating from -40°C to +125°C. It guarantees RESET validity down to VCC = 1V and provides 140ms minimum power-on reset delay.
For engineers reviewing the MAX823REUK-T datasheet, MAX823REUK-T pinout, MAX823REUK-T application, or MAX823REUK-T equivalent, this page delivers verified functional identity, thermal-grade packaging, reset threshold accuracy (2.63V ±15mV), watchdog timing behavior, and direct alternative selection guidance for critical µP monitoring designs.
Technical Context
The MAX823REUK-T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a 1.6s watchdog timer cleared by WDI edge transitions, and an internal 52kΩ MR pullup resistor. Its reset generator asserts active-low RESET for ≥140ms after VCC exceeds 2.63V and holds RESET low during brownout events down to 1V.
It operates across VCC = +2.7V to +3.6V (matched to its 2.63V threshold), draws only 3µA typical supply current in SOT23 package, and features transient immunity against negative-going VCC glitches up to 100ns at 100mV overdrive - all fully specified over -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±15mV at +25°C; stable over temperature (40ppm/°C) |
| Reset Timeout Period | 140–280ms; ensures reliable µP initialization after power-up or brownout | Watchdog Timeout | 1.12–2.40s; monitors µP firmware execution with 50ns pulse detection |
| Supply Current | 3µA typical (SOT23); enables ultra-low-power battery-backed operation |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial control |
| VCC Range | +2.7V to +3.6V; precisely aligned to 2.63V reset threshold for margin |
| RESET Validity | Guaranteed down to VCC = 1V; maintains system reset integrity during deep brownout |
Pinout & Package
MAX823REUK-T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm height, lead-free (RoHS-compliant) with "-T" suffix indicating tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset output | Drives µP reset pin low for ≥140ms on power-up/brownout/MR assertion; sinks 3.2mA min |
| 2 (GND) | Ground reference | Common return path for reset comparator, watchdog, and MR input circuitry |
| 3 (WDI) | Watchdog input | Edge-sensitive input; clears 1.6s timer on rising/falling transition; disabled if left floating |
| 4 (MR) | Manual reset input | Active-low input with internal 52kΩ pullup; asserts reset when pulled ≤0.3×VCC |
| 5 (VCC) | Supply voltage input | Power rail monitored for reset generation; supports 2.7V–3.6V operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V reset threshold | Enables accurate monitoring of +2.63V rails in low-voltage embedded controllers without external resistors |
| 1.6s watchdog timer with 50ns edge detection | Prevents firmware lockup in safety-critical applications by detecting stalled code execution |
| Manual reset input with 52kΩ internal pullup | Eliminates external pullup resistor; supports switch-to-ground or CMOS logic interface |
| RESET valid to VCC = 1V | Maintains deterministic reset state during severe undervoltage conditions common in automotive cold-crank |
| 140ms minimum reset timeout | Ensures sufficient hold time for slow-starting µPs and peripheral initialization sequences |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors +2.63V core supply in engine ECU during cold-crank (VCC dip to 1.8V) and load-dump transients. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M7 µP until stable 2.63V rail is confirmed and held for ≥140ms. Use Value: Prevents erratic boot behavior during voltage sag; 125°C rating ensures reliability in under-hood placement. | Use Scenario: Provides fail-safe reset for field-programmable gate array (FPGA) configuration in modular PLC backplane. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor triggering hard reset if FPGA firmware hangs during analog sensor polling loop. Use Value: 1.6s timeout and WDI edge sensitivity detect stuck loops; MR allows field-service technician-initiated recovery. |
| Battery-Powered Medical Monitor | Rail-Specific Power Sequencing |
Use Scenario: Ensures clean startup of low-power MSP430 µP powered from regulated +2.63V lithium coin-cell supply. IC Role / Device Role / Timing Role: Reset generator holding µP in reset until battery voltage stabilizes above 2.63V with 140ms debounce. Use Value: 3µA quiescent current extends battery life; 1V RESET validity prevents false release during weak-battery brownout. | Use Scenario: Coordinates power-up sequence between +2.63V analog front-end and +3.3V digital subsystem in test equipment. IC Role / Device Role / Timing Role: Active-low RESET output used as enable signal to delay digital subsystem activation until analog rail is stable. Use Value: Eliminates need for external timing RC network; precise 2.63V threshold matches AFE supply spec. |
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 SOT23-5 package, -40°C to +125°C rating, same WDI/MR functions | Targets +2.93V supplies (e.g., 3.0V LDO outputs); higher threshold reduces false resets on noisy rails | Select when system VCC nominal is 3.0V and requires tighter noise margin above reset point |
| TPS3808G12DBVR | 2.63V threshold, SOT23-6 package, no watchdog, 200ms reset timeout, 1.5µA supply current | Lacks watchdog and MR; suited for simpler reset-only applications where firmware monitoring is handled externally | Choose when watchdog and manual reset are unnecessary and lowest possible quiescent current is critical |
Compared with MAX823REUK-T, MAX823SEUK-T offers higher reset threshold for improved noise immunity on 3.0V rails, while TPS3808G12DBVR reduces complexity and power at the cost of losing watchdog and manual reset functionality - making it suitable only for basic reset supervision.
Availability
MAX823REUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, battery-powered medical monitors, and rail-specific power sequencing requiring stable component supply across extended temperature ranges.
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) designs high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX823 family targets microprocessor supervisory applications demanding precision voltage monitoring, watchdog safety, and manual reset in compact 5-pin packages for harsh environments.
FAQ
What is the exact reset threshold voltage and tolerance for MAX823REUK-T?
The MAX823REUK-T has a factory-trimmed reset threshold of 2.63V with ±15mV initial accuracy at +25°C and a temperature coefficient of 40ppm/°C. This value is guaranteed over the full -40°C to +125°C operating range, enabling precise monitoring of +2.63V power rails in automotive and industrial systems without calibration.
Does MAX823REUK-T include a watchdog timer, and what is its timeout behavior?
Yes, MAX823REUK-T includes a watchdog timer with a nominal timeout of 1.6s (1.12–2.40s over temperature). The timer clears on any rising or falling edge at the WDI pin and triggers reset if no edge occurs within the timeout window. It is disabled when WDI is left unconnected or driven by a three-stated output, making MAX823REUK-T suitable for both watchdog-enabled and watchdog-disabled configurations.
What is the function of the MR pin on MAX823REUK-T, and how is it internally biased?
The MR pin on MAX823REUK-T is an active-low manual reset input with an internal 52kΩ pullup resistor. When pulled to GND (≤0.3×VCC), it asserts RESET for the full timeout period plus 200ms after release. Leaving MR open defaults it to logic high via the internal pullup, eliminating need for external components - a key design simplification in space-constrained applications using MAX823REUK-T.
Can MAX823REUK-T operate reliably during severe voltage brownout conditions?
Yes, MAX823REUK-T guarantees RESET remains valid and correctly asserted down to VCC = 1V, even as supply voltage collapses. This capability ensures deterministic reset behavior during automotive cold-crank events or battery-depleted states where VCC may dip below 2V. Its internal circuitry continues functioning and holding RESET low until VCC recovers above 2.63V and the 140ms timeout expires - a critical feature confirmed in MAX823REUK-T's electrical specifications.
What package type and environmental rating does MAX823REUK-T use?
MAX823REUK-T uses a 5-pin SOT23-5 package (JEDEC MO-178AA) with lead-free RoHS-compliant finish and is rated for operation from -40°C to +125°C. The "EUK" suffix denotes the extended temperature grade, and "-T" indicates tape-and-reel packaging with 2500-piece minimum order quantity - making MAX823REUK-T suitable for under-hood automotive, industrial control, and high-reliability embedded applications.
MAX823REUK-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:
- 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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