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Analog Devices Inc./Maxim Integrated MAX823TEXK+T
- Part No.:
- MAX823TEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX823TEXK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
MAX823TEXK+T from Maxim Integrated is a 5-pin SC70-packaged 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, features 140ms min power-on reset timeout, and provides 1.6s watchdog timeout-designed for reliable brownout and software fault detection in battery-powered embedded controllers.
For engineers reviewing the MAX823TEXK+T datasheet, MAX823TEXK+T pinout, MAX823TEXK+T application, or MAX823TEXK+T equivalent, this page delivers verified functional identity, validated SC70-5 pin mapping, confirmed 3.08V reset threshold, guaranteed 1V reset validity, and real-world substitution guidance for µP reset supervision in space-constrained industrial and portable systems.
Technical Context
The MAX823TEXK+T implements a precision voltage comparator with 5mV hysteresis and 40ppm/°C temperature coefficient to detect VCC drops below its 3.08V threshold. Its internal 140–280ms reset timeout timer ensures stable deassertion after power-up or recovery.
It integrates a dedicated watchdog circuit that triggers reset if WDI remains static >1.6s (1.12–2.40s range), cleared by any edge transition; MR input includes a 52kΩ internal pullup and supports noise-immune manual reset with 500ns delay and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.04V - precisely matches +3.3V supply monitoring with 2.5% tolerance at TA = -40°C to +85°C |
| Reset Timeout Period | 140–280ms - ensures µP initialization completes before release, even under worst-case temperature drift |
| Watchdog Timeout | 1.12–2.40s - enables robust software hang detection without false triggers from transient code stalls |
| Supply Current (SC70) | 2–6µA - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments |
| VCC Operating Range | +3.15V to +3.6V - fully compatible with regulated +3.3V rails, excluding undervoltage lockout interference |
| RESET Validity | Down to VCC = 1V - guarantees fail-safe reset assertion during deep brownout or battery depletion |
| MR Input Pullup | 52kΩ internal - eliminates external resistor, supports direct switch-to-ground or CMOS logic interface |
Pinout & Package
MAX823TEXK+T is housed in a lead-free SC70-5 package (2.0mm × 2.1mm × 0.9mm), optimized for high-density PCB layouts in portable and automotive control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks 1.2mA at VCC = 3.6V, sources ≤0.8×VCC when pulled up externally |
| 2 | GND | Dedicated ground reference for reset comparator and watchdog logic; requires low-impedance connection |
| 3 | WDI | Watchdog input; detects rising/falling edges ≥50ns; disabled if left floating or three-stated |
| 4 | MR | Manual reset input; active-low with internal 52kΩ pullup; asserts reset for ≥1µs pulse width |
| 5 | VCC | Positive supply input; operates from +3.15V to +3.6V; supports 0.1µF local bypass for transient immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V reset threshold | Enables accurate supervision of +3.3V systems without external resistor dividers or calibration |
| 1.6s watchdog timeout | Provides deterministic software execution monitoring while avoiding nuisance resets from interrupt latency |
| 140ms minimum reset timeout | Guarantees sufficient hold time for slow-starting µPs and peripheral initialization sequences |
| Operation down to VCC = 1V | Ensures continuous reset assertion during battery sag or unregulated supply collapse |
| No external components required | Reduces BOM count and layout area-only VCC bypass capacitor needed for EMI suppression |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Compact programmable logic controller modules powering analog input circuits and isolated digital outputs. IC Role / Device Role / Timing Role: Supervises +3.3V FPGA configuration supply and asserts reset during brownout or firmware crash. Use Value: Prevents spurious I/O state changes by holding all outputs in safe default until full system recovery. | Use Scenario: Battery-powered glucose meters and pulse oximeters requiring long shelf life and field reliability. IC Role / Device Role / Timing Role: Monitors coin-cell–derived +3.3V rail and initiates watchdog reset if sensor firmware hangs mid-measurement. Use Value: Extends usable battery life via 2µA quiescent current while guaranteeing patient-safety–critical restart on failure. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Low-voltage subsystems in BCMs managing door locks, lighting, and HVAC interfaces. IC Role / Device Role / Timing Role: Provides reset supervision for 32-bit ARM-based microcontrollers operating from switched +3.3V rails. Use Value: Survives cold-crank transients (down to 1V) and prevents latch-up during load-dump events. | Use Scenario: DIN-rail mounted electricity meters with tamper-proof firmware and secure boot requirements. IC Role / Device Role / Timing Role: Validates main +3.3V supply and triggers hardware reset if bootloader fails to complete within watchdog window. Use Value: Enforces secure boot integrity by ensuring no unauthorized code executes after power interruption. |
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 | SOT23-5 package, -40°C to +125°C operating range vs. SC70-5 and -40°C to +85°C | Better thermal margin for under-hood automotive use; larger footprint limits ultra-compact designs | Select when extended temperature range is mandatory and PCB area permits SOT23 |
| TPS3808G30DBVR | TI part with 3.0V reset threshold, 200ms fixed timeout, no watchdog or MR inputs | Lower cost for basic reset-only functions; lacks dual-fault detection capability of MAX823TEXK+T | Select only if watchdog and manual reset are unnecessary and 0.08V threshold offset is acceptable |
Compared with MAX823TEUK+T, the MAX823TEXK+T offers smaller SC70 packaging but narrower temperature range; versus TPS3808G30DBVR, it adds critical watchdog and MR functionality at higher integration-making it essential for safety-critical or field-upgradable embedded systems.
Availability
MAX823TEXK+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, and automotive body control units requiring stable component supply across production lifecycles.
Supply support for MAX823TEXK+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 and mixed-signal ICs for industrial, automotive, and communications applications.
The MAX823 family targets space-constrained embedded systems needing integrated reset, watchdog, and manual reset in a single 5-pin device-optimized for reliability in battery-powered and harsh-environment applications.
FAQ
What is the exact reset threshold voltage of the MAX823TEXK+T?
The MAX823TEXK+T has a factory-trimmed reset threshold of 3.08V, specified over -40°C to +85°C with ±0.04V tolerance. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies directly to the "T" suffix variant in SC70 packaging. The MAX823TEXK+T uses this precise threshold to supervise +3.3V power rails without external adjustment.
Does the MAX823TEXK+T include a watchdog timer, and what is its timeout behavior?
Yes, the MAX823TEXK+T includes a watchdog timer with a nominal timeout of 1.6 seconds, ranging from 1.12s to 2.40s over temperature. The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted. If WDI remains static beyond the timeout, RESET pulses low for 200ms. This behavior is intrinsic to the MAX823TEXK+T and distinguishes it from MAX824/MAX825 variants lacking MR or complementary reset.
Can the MAX823TEXK+T operate reliably when VCC drops below 2V?
Yes-the MAX823TEXK+T guarantees valid RESET output down to VCC = 1V, as explicitly stated in the General Description and Electrical Characteristics tables. Its internal comparator and logic remain functional throughout this range, enabling fail-safe reset assertion during severe brownout or battery depletion scenarios. This specification is measured and guaranteed for the MAX823TEXK+T across its full operating temperature range.
What package type and pin count does the MAX823TEXK+T use?
The MAX823TEXK+T uses a 5-pin SC70 package (2.0mm × 2.1mm × 0.9mm), confirmed in the Ordering Information table and Pin Configurations diagram. This lead-free, surface-mount package is distinct from the SOT23-5 option used by other MAX823 variants like MAX823TEUK+T. All electrical and timing specifications in the datasheet apply specifically to the SC70-5 form factor of the MAX823TEXK+T.
How does the manual reset (MR) input function on the MAX823TEXK+T?
The MR input on the MAX823TEXK+T is an active-low signal with an internal 52kΩ pullup resistor. A logic-low pulse ≥1µs asserts RESET for the full timeout period (140–280ms), and RESET remains asserted for 200ms after MR returns high. This behavior is documented in the Pin Description and Detailed Description sections and is exclusive to MAX823/MAX825 variants-confirming MR functionality is present and fully supported in the MAX823TEXK+T.
MAX823TEXK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX823TEXK+T FAQ
1.How can I place an order for MAX823TEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823TEXK+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 MAX823TEXK+T reliable?
The price and inventory of MAX823TEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823TEXK+T is usually 5 days.
3.What payment methods are accepted for MAX823TEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823TEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823TEXK+T?
MAX823TEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823TEXK+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 MAX823TEXK+T?
For technical support, including MAX823TEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823TEXK+T requirements.
6.How does Aetrix verify that MAX823TEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX823TEXK+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 MAX823TEXK+T meets industry standards.
7.What is the process for return or replacement of MAX823TEXK+T?
All MAX823TEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823TEXK+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 MAX823TEXK+T part is unused and in its original packaging.
Return procedure for MAX823TEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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