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Analog Devices Inc./Maxim Integrated MAX823TEUK+T
- Part No.:
- MAX823TEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823TEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,741
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Product details
Overview
MAX823TEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer, and manual reset input. It monitors +3.08V power supplies, asserts reset down to VCC = 1V, provides 140ms min power-on reset timeout, and features 1.6s watchdog timeout. It is used in automotive systems and critical µP monitoring where transient immunity and guaranteed low-voltage reset validity are required.
For engineers reviewing the MAX823TEUK+T datasheet, MAX823TEUK+T pinout, MAX823TEUK+T application, or MAX823TEUK+T equivalent, key selection factors include its 3.08V reset threshold, -40°C to +125°C operating range, SOT23-5 package, watchdog enable/disable behavior via WDI connection, and compatibility with bidirectional µP reset pins requiring ≤400µA pullup current.
Technical Context
The MAX823TEUK+T integrates a precision voltage comparator for 3.08V threshold detection with 5mV hysteresis, a 1.6s watchdog timer cleared by WDI edge transitions, and a manual reset input with 52kΩ internal pullup. Its RESET output remains valid during VCC decay to 1V and guarantees 200ms minimum assertion after any reset trigger.
It operates across VCC = +3.15V to +3.6V (for T-suffix), draws only 3µA typical supply current in SOT23 package, and exhibits 40ppm/°C reset threshold temperature coefficient. The device disables watchdog functionality when WDI is left unconnected or three-stated, relying on internal 1.4s servicing pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±15mV at +25°C; ensures reliable reset assertion for +3.3V systems under brownout |
| Watchdog Timeout | 1.6s nominal; detects µP lockup if WDI not toggled within this window |
| Reset Timeout Period | 140–280ms; holds µP in reset long enough for power stabilization and clock settling |
| Supply Current | 3µA typical (SOT23); enables ultra-low-power operation in battery-powered equipment |
| Operating Voltage Range | +3.15V to +3.6V; matches regulated +3.3V rail tolerances without external scaling |
| Temperature Range | -40°C to +125°C; supports under-hood automotive and industrial embedded environments |
| VCC Reset Validity | Guaranteed to VCC = 1V; prevents spurious release during deep brownout or backup-battery switchover |
Pinout & Package
MAX823TEUK+T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, lead-free, tape-and-reel packaged.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Sinks ≥1.2mA at VCC = 3.6V; compatible with bidirectional µP reset pins requiring ≤400µA pullup |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be low-impedance for noise immunity |
| 3 - WDI | Watchdog input | Edge-sensitive; clears 1.6s timer on rising/falling transition; disabled if floating or high-impedance |
| 4 - MR | Manual reset input | Active-low with 52kΩ internal pullup; asserts reset for ≥1µs pulse; debounced internally |
| 5 - VCC | Positive supply input | Accepts +3.15V to +3.6V; powers all internal comparators, timer, and output driver |
Key Features
| Feature | Design Value |
|---|---|
| 3.08V Precision Reset Threshold | Matches +3.3V system rails with ±0.5% accuracy over -40°C to +125°C, eliminating external resistor dividers |
| 1.6s Watchdog Timer | Provides deterministic software hang detection without external RC timing components or firmware overhead |
| Manual Reset Input with Internal Pullup | Enables pushbutton reset using only a switch to GND-no external resistor or debounce circuit required |
| VCC Immunity to Fast Transients | Rejects <100ns negative-going VCC glitches up to 300mV below threshold, preventing false resets in noisy environments |
| 1V Minimum VCC Reset Validity | Ensures µP remains held in reset during backup battery switchover or deep undervoltage conditions |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring +3.3V microcontroller supply in engine bay under wide temperature and EMI stress. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset during cold cranking voltage sag or load dump transients. Use Value: Guarantees reset assertion down to VCC = 1V and rejects 100ns VCC glitches, preventing ECU corruption during ignition events. | Use Scenario: Ensuring deterministic restart of safety-critical logic controllers after brownout or firmware fault. IC Role / Device Role / Timing Role: Watchdog-enforced reset source that triggers on µP software lockup or communication timeout. Use Value: 1.6s watchdog timeout and 200ms reset hold time provide sufficient margin for I/O settling and watchdog service latency. |
| Portable Medical Monitor | Battery-Powered IoT Sensor Node |
Use Scenario: Maintaining safe state during lithium battery discharge from 4.2V to 2.8V with regulated +3.3V rail. IC Role / Device Role / Timing Role: Low-power supervisor enabling graceful shutdown and restart when main supply falls below 3.08V. Use Value: 3µA typical supply current extends battery life; 140ms reset timeout ensures stable clock acquisition before µP boot. | Use Scenario: Enabling remote firmware update recovery via manual reset button and autonomous watchdog supervision. IC Role / Device Role / Timing Role: Dual-trigger reset generator responding to both user-initiated MR signal and silent µP hang via WDI. Use Value: Integrated MR and WDI eliminate need for separate reset IC and watchdog IC, reducing BOM count and PCB area. |
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; otherwise identical pinout, package, and feature set | Targeted at +3.0V or lower supply rails; requires verification of system brownout margin at 2.93V vs. 3.08V | Select when system VCC nominal is 3.0V and tighter brownout tolerance is needed |
| TPS3808G30DBVR | 3.0V reset threshold; 350ms reset timeout; no watchdog or manual reset; SOT23-5 package | Lacks watchdog and MR functions; suitable only for basic reset-only applications without supervision or user intervention | Choose only if watchdog and manual reset are unnecessary and longer reset timeout is acceptable |
Compared with MAX823TEUK+T, MAX823SEUK+T offers lower threshold for tighter 3.0V rail monitoring but identical supervision features, while TPS3808G30DBVR reduces cost and complexity by omitting watchdog and MR-making it viable only for non-critical reset-only use cases.
Availability
MAX823TEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, portable medical monitors, and battery-powered IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823TEUK+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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX823 family delivers integrated microprocessor supervision-including reset, watchdog, and manual reset-in miniature 5-pin packages for space-constrained, high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX823TEUK+T and how is it specified over temperature?
The MAX823TEUK+T has a nominal reset threshold of 3.08V, with tolerance of ±15mV at +25°C and ±30mV over full -40°C to +125°C range. Its temperature coefficient is 40ppm/°C, resulting in ≤±12mV drift across the operating range. This specification ensures predictable brownout response for +3.3V systems without external calibration. The MAX823TEUK+T datasheet confirms this value in the Reset Threshold Table and Electrical Characteristics section.
Does the MAX823TEUK+T require external components to operate, and what are its power supply requirements?
No, the MAX823TEUK+T requires no external components-it integrates precision voltage reference, comparator, watchdog timer, and reset delay circuitry. It operates from +3.15V to +3.6V on VCC, drawing only 3µA typical supply current in SOT23 package. This single-supply operation eliminates need for resistive dividers, capacitors, or timing resistors. All functionality-including RESET, WDI, and MR-is self-contained within the MAX823TEUK+T die.
How does the watchdog function behave on the MAX823TEUK+T when the WDI pin is left unconnected?
When WDI is left unconnected or driven high-impedance, the MAX823TEUK+T watchdog is automatically disabled. Internally, the WDI node is serviced every ~1.4s by a low-high-low pulse from the watchdog counter chain, preventing timeout. This behavior is documented in the MAX823TEUK+T datasheet Notes section and Functional Description. No external pullup/down is needed-the MAX823TEUK+T safely defaults to watchdog-off mode with floating WDI.
Can the MAX823TEUK+T drive a microcontroller with a bidirectional reset pin, and what is its RESET output current capability?
Yes, the MAX823TEUK+T RESET output is designed to interface directly with bidirectional µP reset pins such as those on the 68HC11. Its RESET pin sources up to 400µA when pulled high (at VCC = 3.6V), allowing the µP to override and force RESET low during normal operation. This sourcing capability is explicitly specified in the MAX823TEUK+T Electrical Characteristics table and verified in the Interfacing to µPs with Bidirectional Reset Pins application note.
What is the minimum pulse width required on the MR pin of the MAX823TEUK+T to reliably assert reset?
The MAX823TEUK+T requires a minimum MR pulse width of 1.0µs to guarantee reset assertion. Its MR input also provides 100ns noise immunity-meaning pulses shorter than 100ns will not trigger reset, enhancing robustness against EMI. The internal 52kΩ pullup ensures MR is logic-high when unused, and the pin accepts standard CMOS logic levels. These timing and interface specifications are confirmed in the MAX823TEUK+T Electrical Characteristics and Detailed Description sections.
MAX823TEUK+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:
- 3.08V
- 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
MAX823TEUK+T FAQ
1.How can I place an order for MAX823TEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823TEUK+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 MAX823TEUK+T reliable?
The price and inventory of MAX823TEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823TEUK+T is usually 5 days.
3.What payment methods are accepted for MAX823TEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823TEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823TEUK+T?
MAX823TEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823TEUK+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 MAX823TEUK+T?
For technical support, including MAX823TEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823TEUK+T requirements.
6.How does Aetrix verify that MAX823TEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX823TEUK+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 MAX823TEUK+T meets industry standards.
7.What is the process for return or replacement of MAX823TEUK+T?
All MAX823TEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823TEUK+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 MAX823TEUK+T part is unused and in its original packaging.
Return procedure for MAX823TEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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