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Analog Devices Inc./Maxim Integrated MAX820MESE+
- Part No.:
- MAX820MESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820MESE+.pdf
- Description:
- IC SUPERVISOR MPU 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,399
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Product details
Overview
MAX820MESE+ from Maxim Integrated is a microprocessor supervisory circuit with ±2% reset and low-line threshold accuracy, 200ms power-up reset delay, and integrated watchdog timer with programmable timeout (1.6s nominal). It provides dual reset outputs (RESET/RESET), manual-reset input, chip-enable gating, and overvoltage detection - designed for critical power monitoring in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX820MESE+ datasheet, MAX820MESE+ pinout, MAX820MESE+ application, or MAX820MESE+ equivalent, this page delivers verified functional identity, validated 16-pin SO package mapping, confirmed ±2% threshold accuracy (vs. MAX792's ±3%), exact watchdog timing behavior, and real-world memory write-cycle protection implementation details.
Technical Context
The MAX820MESE+ implements dual independent comparators: one for reset generation (with 200ms timeout and guaranteed validity down to VCC = 1V) and another for low-line warning (120mV above reset threshold, ±2% accuracy). Its internal voltage reference (1.30V) feeds both comparators and the LLIN/REFOUT pin, enabling precise external threshold programming via resistor dividers.
It integrates a transmission-gate-based CE IN/CE OUT path (10ns max propagation delay) that disables during reset to prevent memory corruption, plus a dedicated watchdog subsystem with two outputs: WDPO (pulse, 500µs min duration) and WDO (latched fault signal), both synchronized to WDI edge detection with 70ns inter-output delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Accuracy | ±2% (guaranteed for MAX820 family; enables tighter supply margining vs. ±3% MAX792) |
| Power-Up Reset Delay | 200ms typical (ensures stable VCC before µP release; fixed, not adjustable) |
| Watchdog Timeout (default) | 1.6s nominal (SWT tied to VCC; supports external capacitor for 27×CnF ms at 3V or 16.2×CnF ms at 5V) |
| Chip-Enable Propagation Delay | 10ns maximum (supports high-speed µP bus timing; measured from CE IN 50% to CE OUT 50%) |
| RESET Output Validity Range | VCC ≥ 1V (guaranteed logic-low sink capability down to 1V; requires 10kΩ pull-down for GND-level validity) |
| Low-Line Warning Offset | 120mV above reset threshold (provides early NMI alert prior to reset assertion) |
| Supply Current (typical) | 70µA at +25°C, VCC = 5V (enables low-power system monitoring without burdening supply) |
Pinout & Package
MAX820MESE+ is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm width, RoHS-compliant lead-free finish (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | RESET / RESET | Complementary active-low reset outputs; RESET sinks 1.6mA @ 0.1V; RESET is inverted; both valid down to VCC = 1V |
| 3 | VCC | Main supply input (2.75V–5.5V); powers all internal circuits and drives outputs |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external programming mode |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 6 | OVO | Overvoltage comparator output (open-drain); asserts low when OVI > 1.30V; uncommitted function |
| 7 | OVI | Inverting input of overvoltage comparator; connect to voltage divider for overvoltage detection |
| 8 | SWT | Watchdog timeout setting: tie to VCC for 1.6s default; connect capacitor to GND for programmable timeout |
| 9 | MR | Manual-reset input; internally pulled up; 1.30V threshold; 25µs minimum pulse width required |
| 10 | LOW LINE | Active-low low-line warning output; asserts 120mV above reset threshold in internal mode |
| 11 | WDI | Watchdog input; edge-sensitive; timeout resets on any transition (min 100ns pulse at 5V) |
| 12 | GND | Ground reference for all analog and digital functions; common return path |
| 13 | CE OUT | Chip-enable output; gated by CE IN and reset state; disabled during reset to block memory writes |
| 14 | CE IN | Chip-enable input; transmission gate control; high-impedance during reset assertion |
| 15 | WDO | Watchdog fault output; latched low until next WDI transition; precedes WDPO by 70ns |
| 16 | WDPO | Watchdog pulse output; 500µs–6ms pulse on timeout expiry; used for flip-flop clocking in shutdown logic |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset/low-line threshold accuracy | Enables reliable operation across wider temperature ranges (–40°C to +85°C) without recalibration |
| Integrated chip-enable transmission gate | Prevents memory corruption during brownout by blocking CE signals within 15µs of reset assertion |
| Dual watchdog outputs (WDPO + WDO) | Supports staged fault response: WDPO triggers diagnostic logging; WDO initiates hardware reset or shutdown |
| External threshold programming capability | Allows custom reset (e.g., 4.4V) and low-line (e.g., 4.75V) thresholds using resistor dividers on RESET IN/INT and LLIN/REFOUT |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic reset behavior during deep brownout, critical for fail-safe systems |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and runtime supervision in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Supervises 5V/3.3V rails, asserts RESET on brownout, generates LOW LINE NMI for graceful I/O shutdown, gates CE to protect configuration EEPROM. Use Value: Prevents spurious relay actuation or sensor misreads during voltage sags; ±2% accuracy ensures consistent trip points across temperature swings. |
Use Scenario: Critical power monitoring in portable ultrasound or patient monitor units where firmware integrity must be preserved during battery transitions. IC Role / Device Role / Timing Role: Monitors main DC-DC output, triggers watchdog reset on software hang, uses WDPO to log fault timestamp before WDO forces hard reset. Use Value: Dual watchdog outputs enable forensic logging prior to shutdown; 10ns CE delay preserves real-time data acquisition timing. |
| Telecom Base Station Management | Automotive Body Control Module |
Use Scenario: Supervision of FPGA and DSP power domains in remote radio head units exposed to wide ambient temperature variation. IC Role / Device Role / Timing Role: Provides reset coordination across multiple voltage rails, uses external programming to set rail-specific thresholds, monitors overvoltage on auxiliary supplies via OVI/OVO. Use Value: External threshold flexibility allows matching reset points to individual regulator tolerances; ±2% accuracy maintains reliability from –40°C to +85°C. |
Use Scenario: Power management and fault recovery in body control modules subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Generates robust reset under 1V brownout (via 10kΩ pull-down on RESET), uses MR for service-mode entry, gates CE to prevent flash corruption during ignition cycling. Use Value: Guaranteed RESET validity to 1V prevents undefined µP states during cold-crank; manual-reset input supports technician diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792MESE+ | ±3% reset threshold accuracy; no guaranteed RESET validity below 2.5V; identical pinout and feature set | Suitable for cost-sensitive designs where ±2% accuracy is not required | Select MAX792MESE+ only if design margins allow looser threshold tolerance and brownout behavior above 2.5V |
| TPS3823MPW | Single reset output; no low-line warning, watchdog, CE gating, or overvoltage comparator; 200ms fixed delay; ±1.5% accuracy | Applicable only for basic reset-only use cases without advanced supervision features | Choose TPS3823MPW only when full MAX820MESE+ functionality is unnecessary and footprint reduction is prioritized |
Compared with MAX792MESE+, MAX820MESE+ delivers tighter threshold control and deeper brownout resilience; compared with TPS3823MPW, it provides comprehensive multi-function supervision at the cost of higher pin count and complexity - making it optimal for systems requiring coordinated reset, watchdog, memory protection, and early warning capabilities.
Availability
MAX820MESE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, automotive body control modules, and critical microprocessor power monitoring applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX820MESE+ 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 management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX820MESE+ belongs to Maxim's microprocessor supervisory circuit product line, engineered specifically for fail-safe power monitoring and system-level fault recovery in mission-critical embedded systems.
FAQ
What is the guaranteed operating voltage range for MAX820MESE+?
The MAX820MESE+ operates from VCC = 2.75V to 5.5V. Crucially, its RESET output remains guaranteed functional down to VCC = 1V - a key differentiator from many supervisory ICs. This ensures deterministic reset behavior during severe brownout events. The device itself ceases normal operation below 2.75V, but the reset assertion mechanism remains active and valid through the 1V threshold, provided a 10kΩ pull-down resistor is used on the RESET pin.
How does MAX820MESE+ differ from MAX792MESE+ in practical design terms?
The MAX820MESE+ guarantees ±2% reset and low-line threshold accuracy versus ±3% for MAX792MESE+, enabling tighter supply margining in temperature-varying environments. It also specifies guaranteed RESET validity down to VCC = 1V (vs. 2.5V for MAX792), critical for deep brownout resilience. All other features - pinout, watchdog, CE gating, and electrical specs - are identical, making MAX820MESE+ a direct accuracy- and robustness-enhanced replacement.
Can MAX820MESE+ be used to supervise multiple voltage rails?
Yes - MAX820MESE+ can supervise multiple rails using external programming. By connecting RESET IN/INT and LLIN/REFOUT to resistor dividers referenced to each rail, you can configure independent reset and low-line thresholds per supply. For example, a 3.3V rail can be monitored with a 3.06V reset threshold (suffix 'T'), while a 5V rail uses a 4.62V threshold (suffix 'L'). The device's single VCC pin must be powered from a stable reference rail, typically the highest-priority supply.
What is the purpose of the WDPO and WDO outputs, and how should they be used together?
WDPO (Watchdog Pulse Output) delivers a 500µs–6ms low pulse upon watchdog timeout expiry, while WDO (Watchdog Output) latches low until the next WDI transition. Use WDPO to trigger diagnostic actions (e.g., logging or LED blink) before full shutdown; use WDO to force hardware reset or disable power stages. In safety-critical designs, WDPO clocks a D-flip-flop whose Q output drives MR - causing a hard reset only after two consecutive WDPO pulses, preventing nuisance resets from transient faults.
Does MAX820MESE+ require external components for basic reset functionality?
No - MAX820MESE+ operates autonomously with only VCC and GND connections for basic reset supervision in internal threshold mode. RESET IN/INT tied to GND selects factory-set thresholds (e.g., 4.62V for suffix 'L'), and MR can remain unconnected if manual reset is unused. External components become necessary only for advanced features: a capacitor on SWT for custom watchdog timeout, resistors on RESET IN/INT and LLIN/REFOUT for external threshold programming, or a 10kΩ pull-down on RESET for sub-1V validity assurance.
MAX820MESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX820MESE+ FAQ
1.How can I place an order for MAX820MESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820MESE+ 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 MAX820MESE+ reliable?
The price and inventory of MAX820MESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820MESE+ is usually 5 days.
3.What payment methods are accepted for MAX820MESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820MESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820MESE+?
MAX820MESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820MESE+ 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 MAX820MESE+?
For technical support, including MAX820MESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820MESE+ requirements.
6.How does Aetrix verify that MAX820MESE+ is sourced from the original manufacturer or authorized distributors?
All MAX820MESE+ 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 MAX820MESE+ meets industry standards.
7.What is the process for return or replacement of MAX820MESE+?
All MAX820MESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820MESE+, 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 MAX820MESE+ part is unused and in its original packaging.
Return procedure for MAX820MESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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