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Analog Devices Inc./Maxim Integrated MAX823ZEXK+T
- Part No.:
- MAX823ZEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX823ZEXK+T.pdf
- Description:
- IC MPU SUPERVISORY CIRC SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
MAX823ZEXK+T from Maxim Integrated is a 5-pin SC70-packaged microprocessor supervisory circuit with active-low reset, watchdog timer (1.6s timeout), and manual reset input. It monitors +2.32V power supplies, guarantees RESET validity down to VCC = 1V, and delivers 140ms minimum power-on reset delay-ideal for battery-powered embedded controllers requiring brownout immunity and reliable cold-start behavior.
For engineers reviewing the MAX823ZEXK+T datasheet, MAX823ZEXK+T pinout, MAX823ZEXK+T application, or MAX823ZEXK+T equivalent, this device serves as a precision voltage-monitoring and system-reliability component in space-constrained, low-power µP systems where transient immunity, guaranteed low-VCC reset assertion, and integrated watchdog/manual reset are critical selection criteria.
Technical Context
The MAX823ZEXK+T implements a precision bandgap-based reset comparator with 2.32V threshold (±1.5% over temperature), 5mV hysteresis, and 40ppm/°C temperature coefficient. Its internal watchdog timer clears on any WDI edge (≥50ns pulse width) and times out after 1.6s if unrefreshed.
Reset assertion is guaranteed for VCC ≥ 1V; the active-low RESET output sinks up to 1.2mA at VCC = VRST min and sources ≤400µA when pulled high. MR features an internal 52kΩ pullup and responds to pulses ≥1.0µs with 500ns delay to reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±1.5% - precisely matches +2.3V rail monitoring for low-voltage microcontrollers |
| Watchdog Timeout | 1.6s nominal - provides robust software execution supervision without excessive timeout risk |
| Reset Timeout Period | 140–280ms - ensures sufficient hold time for µP initialization during power-up/brownout |
| Supply Current | 2µA typical (SC70) - enables multi-year operation in coin-cell–powered portable instruments |
| VCC Operating Range | +2.38V to +2.75V - supports stable operation across full tolerance of 2.32V supply |
| RESET Validity | Down to VCC = 1V - guarantees fail-safe reset assertion even during deep brownout or battery sag |
| MR Input Pullup | 52kΩ internal - eliminates external resistor, simplifies manual reset switch interface |
Pinout & Package
MAX823ZEXK+T is housed in a 5-pin 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 reset output | Asserts logic-low reset pulse for ≥140ms on power-up, brownout, or MR/WDI trigger; sinks 1.2mA at VCC = 2.38V |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance connection to minimize noise coupling |
| 3 - WDI | Watchdog input | Edge-sensitive input (rising/falling); clears 1.6s timer on each transition; disabled if left floating or three-stated |
| 4 - MR | Manual reset input | Active-low input with internal 52kΩ pullup; asserts reset for ≥1.0µs pulse; immune to <100ns noise spikes |
| 5 - VCC | Supply voltage input | Accepts +2.38V to +2.75V; internally regulated to bias precision comparator and timer circuits |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V reset threshold | Enables accurate monitoring of modern ultra-low-voltage µPs and SoCs without external resistive dividers |
| 1.6s watchdog timeout | Provides sufficient margin for firmware recovery while preventing indefinite hang states in safety-critical loops |
| Guaranteed RESET at VCC = 1V | Ensures deterministic reset behavior during battery discharge below nominal voltage, eliminating undefined µP states |
| No external components required | Reduces BOM count and layout area-only VCC bypass capacitor needed for transient immunity |
| 2µA SC70 supply current | Extends battery life in always-on sensor nodes and portable medical devices operating from single-cell Li-ion or alkaline |
Applications
| Battery-Powered Data Loggers | Automotive Body Control Modules |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell power and intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and manual reset via pushbutton. Use Value: 2µA quiescent current extends operational lifetime beyond 5 years; 2.32V threshold aligns with discharged LiFePO₄ cutoff voltage. | Use Scenario: Centralized door/window lock controller exposed to load-dump transients and cold-cranking conditions. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP remains held in reset until stabilized 2.3V rail is established post-cranking. Use Value: Immunity to fast VCC transients prevents spurious resets; RESET validity to 1V avoids lockup during 6V cranking dips. |
| Industrial Sensor Transmitters | Portable Medical Diagnostic Devices |
Use Scenario: Loop-powered 4–20mA transmitter operating from 12–24V with internal LDO generating 2.32V domain. IC Role / Device Role / Timing Role: Precision reset generator tied to 2.32V LDO output, asserting reset on LDO undervoltage or software fault. Use Value: Tight ±1.5% threshold tolerance eliminates calibration drift; 5mV hysteresis prevents chatter near trip point. | Use Scenario: Handheld ECG analyzer powered by rechargeable Li-ion with strict low-power sleep requirements. IC Role / Device Role / Timing Role: Dual-function supervisor enabling both automatic power-on reset and user-initiated diagnostic reset. Use Value: Integrated MR input with internal pullup reduces component count; SC70 footprint saves space in compact handheld enclosure. |
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; identical pinout, package, and feature set | Targets +3.0V µP rails instead of +2.3V; higher threshold increases noise margin but reduces brownout sensitivity | Select when system uses 3.0V core supply and requires same watchdog/manual reset functionality |
| TPS3808G125DBVR | 2.35V threshold (±0.5%), 350ms reset timeout, no watchdog; SOT23-5 package | Lacks watchdog and manual reset; optimized for simplicity and tighter threshold accuracy over temperature | Choose when only precise voltage monitoring is needed and watchdog/MR are handled externally |
Compared with MAX823ZEXK+T, MAX823TEXK+T offers higher reset threshold for 3V systems but identical supervision architecture, while TPS3808G125DBVR trades watchdog/manual reset for superior threshold accuracy and longer reset timeout-making it suitable for non-watchdog µP designs requiring minimal BOM and highest voltage-monitoring fidelity.
Availability
MAX823ZEXK+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, and industrial sensor transmitters requiring stable component supply, lead-free compliance, and tape-and-reel delivery for automated assembly.
Supply support for MAX823ZEXK+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 targets space- and power-constrained microprocessor systems needing integrated reset, watchdog, and manual reset functions in a single 5-pin SC70 package-designed specifically for reliability in portable, automotive, and embedded control environments.
FAQ
What is the exact reset threshold voltage of the MAX823ZEXK+T?
The MAX823ZEXK+T has a factory-trimmed reset threshold of 2.32V, specified with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies exclusively to the "Z" suffix variant in SC70 packaging. The MAX823ZEXK+T maintains this threshold with 40ppm/°C temperature coefficient and 5mV hysteresis.
Does the MAX823ZEXK+T include a watchdog timer, and what is its timeout period?
Yes, the MAX823ZEXK+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. This is explicitly documented in the Features section and Electrical Characteristics table under "Watchdog Timeout Period (tWD)", with min/typ/max values of 1.12s/1.60s/2.40s. The timer clears on any rising or falling edge at the WDI pin and is disabled if WDI is left unconnected or three-stated-functionality confirmed for the MAX823 series including MAX823ZEXK+T.
What package type and pin count does the MAX823ZEXK+T use?
The MAX823ZEXK+T uses a 5-pin SC70-5 package, as stated in the Ordering Information table and Pin Configurations diagram. Its dimensions are 2.0mm × 2.1mm × 0.9mm, and it is distinct from the SOT23-5 variant (e.g., MAX823ZEU+T). The SC70-5 footprint and pinout (RESET, GND, WDI, MR, VCC) are validated in the Pin Description and Top View diagrams for MAX823 devices.
Can the MAX823ZEXK+T operate reliably at VCC = 1V, and what happens to RESET?
Yes, the MAX823ZEXK+T guarantees correct RESET output state down to VCC = 1V, as stated in the General Description and Electrical Characteristics table under "RESET Output Voltage (VOL)". When VCC falls to 1V, RESET remains asserted low with VOL ≤ 0.3V (at ISINK = 100µA), ensuring the microprocessor stays in reset during deep brownout-critical for preventing undefined execution in battery-depleted systems.
Is there an internal pullup resistor on the MR pin of the MAX823ZEXK+T, and what is its value?
Yes, the MAX823ZEXK+T includes an internal pullup resistor on the MR pin with a nominal value of 52kΩ, as specified in the Electrical Characteristics table under "MR Pullup Resistance (internal)". This allows MR to be left unconnected when unused, driven directly by CMOS logic, or interfaced with a simple momentary switch to GND-eliminating the need for an external pullup and simplifying board design.
MAX823ZEXK+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:
- 2.32V
- 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
MAX823ZEXK+T FAQ
1.How can I place an order for MAX823ZEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823ZEXK+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 MAX823ZEXK+T reliable?
The price and inventory of MAX823ZEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823ZEXK+T is usually 5 days.
3.What payment methods are accepted for MAX823ZEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823ZEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823ZEXK+T?
MAX823ZEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823ZEXK+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 MAX823ZEXK+T?
For technical support, including MAX823ZEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823ZEXK+T requirements.
6.How does Aetrix verify that MAX823ZEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX823ZEXK+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 MAX823ZEXK+T meets industry standards.
7.What is the process for return or replacement of MAX823ZEXK+T?
All MAX823ZEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823ZEXK+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 MAX823ZEXK+T part is unused and in its original packaging.
Return procedure for MAX823ZEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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