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Analog Devices Inc./Maxim Integrated MAX823SEXK+T
- Part No.:
- MAX823SEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX823SEXK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:28,841
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Product details
Overview
MAX823SEXK+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 +2.93V power supplies, asserts reset down to VCC = 1V, features 140ms min power-on reset timeout, and delivers 6µA operating current (SC70). It is used in embedded controllers and portable battery-powered equipment for reliable µP startup and brownout protection.
For engineers reviewing the MAX823SEXK+T datasheet, MAX823SEXK+T pinout, MAX823SEXK+T application, or MAX823SEXK+T equivalent, key selection criteria include reset threshold accuracy (2.93V ±15mV), watchdog timeout (1.6s), manual reset pulse handling (1.0µs minimum), internal MR pullup (52kΩ), and guaranteed RESET validity at 1V VCC.
Technical Context
The MAX823SEXK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect VCC drops below 2.93V. Its reset generator guarantees monotonic assertion during VCC ramp-up and maintains valid logic state down to 1V, enabling operation in deep brownout conditions.
Its integrated watchdog timer clears on any WDI edge (≥50ns) and times out after 1.6s if unrefreshed; the manual reset path includes internal 52kΩ pullup and 500ns MR-to-RESET delay, supporting direct switch or CMOS interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±15mV at TA = +25°C; ensures reliable detection of +2.93V supply brownout |
| Reset Timeout Period | 140–280ms; holds µP in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.12–2.40s; provides fail-safe software execution monitoring with 1.6s nominal period |
| Supply Current | 2µA (typ) at +25°C; enables multi-year operation in battery-powered systems |
| VCC Operating Range | +3.0V to +3.6V; matches standard +3.3V rail with 10% margin for ripple tolerance |
| RESET Validity | Guaranteed down to VCC = 1V; supports µP reset assertion during deep undervoltage events |
| MR Input Pullup | 52kΩ internal resistor; eliminates need for external pullup in manual reset switch interface |
Pinout & Package
MAX823SEXK+T is housed in a 5-pin SC70-5 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained portable designs. Pin 1 is RESET, Pin 2 is GND, Pin 3 is WDI, Pin 4 is MR, and Pin 5 is VCC - matching the MAX823 functional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Drives µP reset pin low for ≥140ms on power-up, brownout, or MR/WDI trigger; sinks 1.2mA at VCC = VRST min |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance PCB connection to minimize noise coupling |
| 3 - WDI | Watchdog input | Edge-sensitive input (rising/falling ≥50ns); clears internal 1.6s timer on transition; disabled when left floating |
| 4 - MR | Manual reset input | Active-low input with 52kΩ internal pullup; asserts reset while low and for 200ms after release; accepts CMOS or switch interface |
| 5 - VCC | Supply voltage input | Accepts +3.0V to +3.6V; powers all internal comparators, timers, and output drivers; requires local 0.1µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V reset threshold | Enables accurate supervision of +3.3V systems with tight tolerance margins and minimal false triggers |
| 1.6s watchdog timeout | Provides sufficient time for complex firmware initialization while detecting hung states in real-time control loops |
| No external components required | Reduces BOM count and PCB area by integrating pullup, timing, and comparator functions on-die |
| 1V VCC reset validity | Ensures deterministic µP reset behavior even during severe supply sag, improving system robustness |
| Power-supply transient immunity | Rejects short-duration negative VCC glitches (e.g., <1µs at 200mV overdrive), preventing spurious resets |
Applications
| Embedded Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Industrial PLC modules requiring deterministic boot sequence and runtime fault recovery. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M4 µP during power-up and brownout. Use Value: Guarantees µP remains held in reset until +3.3V rail stabilizes above 2.93V and internal 140ms timer expires, eliminating race conditions. | Use Scenario: Handheld medical diagnostic device powered by single Li-ion cell (2.7–4.2V range). IC Role / Device Role / Timing Role: Reset supervisor monitoring regulated +3.3V output of buck converter, with manual reset via tactile switch. Use Value: 2µA quiescent current extends battery life; 1V reset validity ensures safe shutdown before cell depletion causes data corruption. |
| Intelligent Instruments | Automotive Systems |
Use Scenario: Portable multimeter with real-time waveform capture and flash-based firmware updates. IC Role / Device Role / Timing Role: Watchdog-enabling supervisor interfacing with MSP430 µP to detect firmware lockups during ADC sampling routines. Use Value: 1.6s watchdog timeout aligns with maximum expected interrupt service latency, triggering hard reset before memory corruption occurs. | Use Scenario: Body control module (BCM) in passenger vehicle with CAN communication and EEPROM logging. IC Role / Device Role / Timing Role: Power monitor ensuring µP reset during ignition cycling and load-dump transients. Use Value: Immunity to fast VCC transients prevents false resets during alternator switching; -40°C to +85°C rating meets automotive ambient requirements. |
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 | Same 2.93V threshold and watchdog/manual reset functions, but in SOT23-5 package with -40°C to +125°C rating | Higher temperature range suits under-hood automotive use; larger SOT23 footprint increases PCB area vs. SC70 | Select when extended temperature operation or legacy SOT23 layout compatibility is required |
| TPS3808G30DBVR | 2.93V reset threshold, 200ms reset timeout, no watchdog or manual reset; 1.6µA IQ; SOT23-5 | Lacks watchdog and MR functionality; suited for simpler reset-only applications where those features are unused | Choose only if watchdog and manual reset are unnecessary and ultra-low IQ (<2µA) is critical |
Compared with MAX823SEXK+T, MAX823TEUK+T offers identical electrical functionality in a higher-temp, larger-package variant, while TPS3808G30DBVR reduces feature set to achieve lower quiescent current but sacrifices system-level fault coverage.
Availability
MAX823SEXK+T is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, intelligent instruments, and automotive systems requiring stable component supply across industrial temperature ranges.
Supply support for MAX823SEXK+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 delivers integrated µP supervision with reset, watchdog, and manual reset in ultra-small packages, targeting space- and power-constrained embedded systems needing high reliability.
FAQ
What is the exact reset threshold voltage for MAX823SEXK+T and how tightly is it specified?
The MAX823SEXK+T has a nominal reset threshold of 2.93V, with a tolerance of ±15mV at +25°C and full specification over temperature (-40°C to +85°C). This value is factory-trimmed and guaranteed per the Reset Threshold Table in the datasheet. The MAX823SEXK+T uses the 'S' suffix, which explicitly denotes the 2.93V option, and its performance is validated across the entire operating voltage range (+3.0V to +3.6V) and temperature range.
Does MAX823SEXK+T support both watchdog and manual reset functions simultaneously?
Yes, the MAX823SEXK+T supports both functions concurrently. As a member of the MAX823 series, it integrates a 1.6s watchdog timer (cleared by edges on WDI pin) and an active-low manual reset input (MR pin) with internal 52kΩ pullup. These operate independently: a watchdog timeout asserts RESET, and pulling MR low also asserts RESET, with both paths contributing to system-level fault coverage in the same MAX823SEXK+T device.
What is the minimum pulse width the MR input of MAX823SEXK+T can reliably detect?
The MR input of MAX823SEXK+T requires a minimum pulse width of 1.0µs to reliably trigger a reset assertion. This specification is confirmed in the Electrical Characteristics table under "MR Pulse Width". Pulses shorter than this may not be recognized due to internal synchronization and filtering, so external debounce or timing circuits must ensure MR transitions meet or exceed this 1.0µs duration for guaranteed operation.
Can MAX823SEXK+T operate with a supply voltage lower than its reset threshold?
Yes, MAX823SEXK+T guarantees valid RESET output down to VCC = 1V, well below its 2.93V reset threshold. This means the device continues to assert RESET correctly even as VCC collapses during brownout, providing clean, monotonic reset signaling to the µP until power is fully lost. This behavior is explicitly tested and guaranteed - not estimated - and applies across the full -40°C to +85°C temperature range.
What package type and lead finish does MAX823SEXK+T use, and how is this indicated in the part number?
MAX823SEXK+T uses the 5-pin SC70-5 package with lead-free (RoHS-compliant) finish. The '+T' suffix in the part number explicitly denotes lead-free tape-and-reel packaging, while 'EXK' indicates the SC70-5 package variant ('EUK' would indicate SOT23-5). This packaging enables high-density placement in portable electronics and meets environmental compliance requirements without requiring solder-process changes.
MAX823SEXK+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:
- 2.93V
- 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
MAX823SEXK+T FAQ
1.How can I place an order for MAX823SEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823SEXK+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 MAX823SEXK+T reliable?
The price and inventory of MAX823SEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823SEXK+T is usually 5 days.
3.What payment methods are accepted for MAX823SEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823SEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823SEXK+T?
MAX823SEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823SEXK+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 MAX823SEXK+T?
For technical support, including MAX823SEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823SEXK+T requirements.
6.How does Aetrix verify that MAX823SEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX823SEXK+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 MAX823SEXK+T meets industry standards.
7.What is the process for return or replacement of MAX823SEXK+T?
All MAX823SEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823SEXK+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 MAX823SEXK+T part is unused and in its original packaging.
Return procedure for MAX823SEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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