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Analog Devices Inc./Maxim Integrated MAX823YEXK+T
- Part No.:
- MAX823YEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX823YEXK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
MAX823YEXK+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 +2.19V supplies with ±1.5% threshold accuracy, guarantees RESET validity down to VCC = 1V, delivers 140ms min power-on reset timeout, and consumes only 2µA typical supply current. It is used in portable battery-powered equipment requiring reliable brownout and software fault recovery.
For engineers reviewing the MAX823YEXK+T datasheet, MAX823YEXK+T pinout, MAX823YEXK+T application, or MAX823YEXK+T equivalent, key selection criteria include reset threshold (2.19V), watchdog timeout (1.6s), manual reset pulse handling (1.0µs min), internal MR pullup (52kΩ), and guaranteed operation at VCC ≥ 1V during brownout.
Technical Context
The MAX823YEXK+T implements a precision bandgap-based reset comparator with 40ppm/°C temperature coefficient and 5mV hysteresis, ensuring stable threshold behavior across -40°C to +85°C. Its watchdog timer uses an internal RC oscillator with 1.12–2.40s timeout range and detects WDI edges as narrow as 50ns.
Reset assertion is triggered by VCC falling below 2.19V, MR logic-low input, or WDI inactivity beyond 1.6s; RESET remains low for ≥140ms after recovery. The device features bidirectional RESET output capable of sinking 1.2mA at VCC = VRST min and sourcing up to 400µA when pulled high by a µP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V ±1.5% - precisely matches +2.2V systems; enables accurate brownout detection before critical logic fails |
| Supply Current | 2µA typical (SC70) - enables multi-year battery life in always-on portable instrumentation |
| Reset Timeout | 140–280ms - ensures full µP initialization and clock stabilization before release |
| Watchdog Timeout | 1.12–2.40s - provides sufficient margin for firmware execution loops without false triggers |
| VCC Operating Range | +2.25V to +2.75V - supports single-cell LiFePO₄ or dual-cell NiMH battery systems |
| RESET Validity | Down to VCC = 1V - maintains deterministic reset state during deep brownout or backup battery switchover |
| MR Input Pullup | 52kΩ internal - eliminates external resistor; allows direct switch-to-GND connection with no debounce needed |
Pinout & Package
MAX823YEXK+T is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm × 0.9mm, 0.65mm pitch), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Open-drain output asserted low during VCC undervoltage, MR activation, or watchdog timeout; sinks 1.2mA minimum |
| 2 - GND | Ground reference | Primary return path for all internal circuits; must be connected to system ground plane with low-inductance routing |
| 3 - WDI | Watchdog input | Edge-sensitive input; rising/falling edges within 1.6s clear internal timer; left unconnected disables watchdog |
| 4 - MR | Manual reset input | Active-low input with internal 52kΩ pullup; asserts reset when pulled ≤0.3×VCC; immune to <100ns noise pulses |
| 5 - VCC | Supply voltage input | Accepts +2.25V to +2.75V; powers internal comparator, timer, and output driver; requires local 0.1µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.19V reset threshold | Enables reliable monitoring of +2.2V rails in LiFePO₄-powered IoT sensors without external scaling resistors |
| 1.6s watchdog timeout with 50ns edge sensitivity | Allows robust software hang detection even in interrupt-driven firmware with minimal timing overhead |
| 2µA SC70 supply current | Reduces quiescent power by >75% vs. SOT23 variants, extending shelf life in battery-backed memory modules |
| RESET valid to VCC = 1V | Ensures deterministic reset assertion during backup battery handover in medical telemetry devices |
| No external components required | Eliminates BOM count and layout area for reset circuitry-full supervision in 1.25mm² footprint |
Applications
| Battery-Powered Data Loggers | Industrial Sensor Nodes |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell batteries with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and software watchdog for ARM Cortex-M0+ MCU. Use Value: 2µA quiescent current extends 10-year deployment life; 2.19V threshold aligns with end-of-discharge voltage of CR2032 cells. | Use Scenario: Wireless vibration sensor mounted on rotating machinery with wide ambient temperature swings. IC Role / Device Role / Timing Role: Reset supervisor ensuring deterministic startup and runtime fault recovery for ultra-low-power MSP430 MCU. Use Value: 40ppm/°C threshold drift maintains ±20mV accuracy over -40°C to +85°C; 140ms reset timeout accommodates slow crystal startup. |
| Portable Medical Monitors | Automotive Body Control Modules |
Use Scenario: Handheld ECG device powered by rechargeable Li-ion with backup supercapacitor. IC Role / Device Role / Timing Role: Dual-role supervisor: primary reset source during main supply operation and brownout handler during capacitor hold-up. Use Value: RESET guaranteed valid to 1V enables seamless transition to backup power without MCU lockup or data corruption. | Use Scenario: Low-voltage interior lighting controller operating from 9–16V automotive rail via LDO. IC Role / Device Role / Timing Role: Voltage monitor and watchdog for safety-critical CAN microcontroller managing LED dimming sequences. Use Value: Immunity to fast transients (<100ns) prevents spurious resets during load-dump events; MR input enables service-mode forced reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TEXK+T | 3.08V reset threshold; 3µA supply current (SC70) | Targets +3.3V systems instead of +2.2V; higher threshold reduces noise sensitivity in noisy automotive environments | Select when monitoring 3.3V rails where 2.19V threshold would cause premature reset during nominal operation |
| TPS3808G12DBVR | 1.2V reset threshold; 1.1µA supply current; no watchdog or MR input | Lacks watchdog and manual reset; optimized for ultra-low-power always-on monitoring only | Choose only if watchdog and MR functions are unnecessary and 1.2V threshold matches system requirements |
Compared with MAX823YEXK+T, MAX823TEXK+T shifts reset threshold upward for 3.3V compatibility but increases supply current slightly, while TPS3808G12DBVR reduces power further but sacrifices watchdog and manual reset-making it unsuitable for systems requiring runtime fault recovery or field service reset capability.
Availability
MAX823YEXK+T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered data loggers, industrial sensor nodes, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for MAX823YEXK+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 power, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX823 family targets space- and power-constrained embedded systems needing integrated reset, watchdog, and manual reset functionality in minimal footprint-specifically for battery-powered and harsh-environment applications.
FAQ
What is the exact reset threshold voltage of MAX823YEXK+T and how tightly is it specified?
The MAX823YEXK+T has a factory-trimmed reset threshold of 2.19V, specified as 2.16V (min) to 2.22V (max) over temperature (-40°C to +85°C), with ±1.5% initial accuracy and 40ppm/°C temperature coefficient. This ensures predictable brownout response in +2.2V systems without external calibration. The MAX823YEXK+T datasheet confirms this value in the Reset Threshold Table under suffix "Y" for SC70 packages.
Does MAX823YEXK+T support watchdog functionality, and what is its timeout behavior?
Yes, MAX823YEXK+T includes a watchdog timer with nominal 1.6s timeout (1.12–2.40s range), cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond timeout, RESET asserts for ≥140ms. The MAX823YEXK+T watchdog is disabled when WDI is left unconnected or driven by a three-stated output, per the Functional Diagram and Detailed Description sections.
Can MAX823YEXK+T operate reliably during deep brownout conditions?
Yes, MAX823YEXK+T guarantees RESET output validity down to VCC = 1V, meaning it continues asserting reset correctly even as supply collapses-critical for orderly shutdown in battery-backed systems. This is confirmed in both the General Description ("guaranteed RESET valid to VCC = 1V") and Electrical Characteristics table (VOL test condition at VCC = 1.2V, falling).
What is the function and electrical behavior of the MR pin on MAX823YEXK+T?
The MR pin on MAX823YEXK+T is an active-low manual reset input with internal 52kΩ pullup resistor. A logic-low signal (≤0.3×VCC) asserts RESET for ≥200ms after MR returns high. It accepts pulses as short as 1.0µs and rejects noise spikes <100ns, enabling direct switch or GPIO connection without external components. This behavior is documented in the Pin Description and Detailed Description sections.
What package type and footprint does MAX823YEXK+T use, and is it lead-free?
MAX823YEXK+T uses the SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch) and is supplied in lead-free format, indicated by the "+T" suffix per Maxim's Ordering Information. The SC70 marking code "AAR" (per Marking Information table) and tape-and-reel packaging with 2500-piece minimum order are confirmed in the datasheet's Ordering Information section.
MAX823YEXK+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:
- 2.19V
- 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
MAX823YEXK+T FAQ
1.How can I place an order for MAX823YEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823YEXK+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 MAX823YEXK+T reliable?
The price and inventory of MAX823YEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823YEXK+T is usually 5 days.
3.What payment methods are accepted for MAX823YEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823YEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823YEXK+T?
MAX823YEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823YEXK+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 MAX823YEXK+T?
For technical support, including MAX823YEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823YEXK+T requirements.
6.How does Aetrix verify that MAX823YEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX823YEXK+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 MAX823YEXK+T meets industry standards.
7.What is the process for return or replacement of MAX823YEXK+T?
All MAX823YEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823YEXK+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 MAX823YEXK+T part is unused and in its original packaging.
Return procedure for MAX823YEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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