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Analog Devices Inc./Maxim Integrated MAX820MEPE+
- Part No.:
- MAX820MEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX820MEPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:647
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Product details
Overview
MAX820MEPE+ from Maxim Integrated is a microprocessor supervisory circuit with ±2% reset and low-line threshold accuracy, 200ms reset timeout, manual-reset input, and integrated watchdog timer with pulsed warning output. It monitors VCC (2.75V–5.5V), asserts active-low RESET down to 1V supply, and provides chip-enable gating for CMOS RAM protection in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX820MEPE+ datasheet, MAX820MEPE+ pinout, MAX820MEPE+ application, or MAX820MEPE+ equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts for power-supply monitoring, and precise design guidance for brownout detection, NMI generation, and watchdog-fault latching in safety-critical µP systems.
Technical Context
The MAX820MEPE+ implements dual-comparator supervision: one for reset assertion at factory-programmed thresholds (4.37V nominal), another for low-line warning 120mV above reset threshold. Its internal 1.30V reference enables ±2% accuracy in both internal and external programming modes.
It integrates a programmable watchdog timer (1.6s default, capacitor-adjustable), a pulsed WDPO output preceding WDO by 70ns, and a bidirectional CE transmission gate with ≤10ns propagation delay and automatic write-cycle completion hold during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.37V ±2% - ensures reliable µP reset before brownout in 5V systems |
| Low-Line Threshold | 4.49V (4.37V + 120mV) - triggers NMI 120mV above reset for early power-fail warning |
| Reset Timeout Period | 200ms typical - guarantees stable µP initialization after power-up or recovery |
| Watchdog Timeout | 1.6s nominal (SWT = VCC) - configurable via external capacitor for flexible fault-detection timing |
| Supply Current | 70µA typical at +25°C - enables low-power operation in battery-backed or energy-constrained systems |
| RESET Output Validity | Down to VCC = 1V - maintains functional reset signaling even during deep undervoltage conditions |
| CE Propagation Delay | ≤10ns max - supports high-speed µP bus timing without violating setup/hold requirements |
Pinout & Package
MAX820MEPE+ is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin numbering follows standard DIP convention (pin 1 at top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET sinks 1.6mA at 0.1V, valid to VCC = 1V |
| 3 | VCC | Main supply input (2.75V–5.5V); powers all internal comparators, timers, and logic |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external resistor-divider programming |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 9 | MR | Manual-reset input with 1.30V threshold and internal pull-up; 25µs minimum pulse width required |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold in internal mode |
| 11 | WDI | Watchdog input - transition resets timer; no activity >1.6s triggers WDPO/WDO assertion |
| 12 | GND | Ground reference for all analog comparators and digital logic |
| 13 | CE OUT | Chip-enable output gated by CE IN and reset state; holds low 15µs after reset if CE IN was low |
| 14 | CE IN | Chip-enable input passed through transmission gate only when reset is deasserted |
| 15 | WDO | Watchdog fault output - goes low on timeout, returns high on next WDI transition |
| 16 | WDPO | Watchdog-pulse output - 500µs–1.7ms low pulse preceding WDO by 70ns for advance warning |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset/low-line threshold accuracy | Enables precise, repeatable power-fail detection without calibration in production test |
| Two-stage power-fail warning | Separate LOW LINE output provides NMI 120mV above reset threshold for graceful shutdown sequencing |
| Pulsed watchdog output (WDPO) | Delivers 500µs–1.7ms advance warning before WDO assertion, enabling single-fault recovery without reset |
| On-board CE signal gating | Prevents RAM corruption during brownout by disabling CE path within 10ns and holding write completion |
| Memory write-cycle completion | CE OUT remains low for 15µs after reset assertion if CE IN was low, ensuring final RAM write completes |
| VCC = 1V guaranteed RESET validity | Ensures deterministic µP reset behavior even under severe undervoltage, critical for fail-safe systems |
Applications
| Industrial PLC Controller Power Monitoring | Medical Infusion Pump Supervision |
|---|---|
Use Scenario: Monitors 5V rail in programmable logic controller during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Provides dual-threshold supervision: LOW LINE triggers firmware-initiated safe stop at 4.49V; RESET forces hard reset at 4.37V if voltage collapses further. Use Value: Prevents erratic I/O execution during marginal supply by decoupling early warning (NMI) from mandatory reset, enabling controlled shutdown. |
Use Scenario: Ensures deterministic restart and RAM integrity in battery-powered infusion pump after brief power interruption. IC Role / Device Role / Timing Role: Generates 200ms power-on reset, gates CE to protect dose-history EEPROM, and uses WDPO pulse to log first fault before WDO forces reboot. Use Value: Guarantees data consistency across power cycles and enables single-watchdog-fault recovery without therapy interruption. |
| Telecom Line Card Brownout Protection | Automotive Body Control Module (BCM) Reset Management |
Use Scenario: Supervises isolated 3.3V supply in carrier-grade line card exposed to lightning-induced sags. IC Role / Device Role / Timing Role: Uses external resistor divider on RESET IN/INT and LLIN/REFOUT to set custom 3.06V reset and 3.18V low-line thresholds matching LDO dropout. Use Value: Matches system-specific voltage margins, avoiding nuisance resets while catching true brownouts before ASIC lockup. |
Use Scenario: Manages reset sequencing for microcontroller and CAN transceiver in 12V automotive BCM with wide input range. IC Role / Device Role / Timing Role: Asserts RESET during cranking (VCC dip to 6V), uses MR for service-mode entry, and feeds WDO to CAN controller's error-pin for bus-off recovery. Use Value: Coordinates power-state transitions across subsystems, enabling diagnostics during undervoltage without compromising functional safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792MEPE+ | Same pinout and function, but ±3% reset threshold accuracy (vs. ±2% for MAX820MEPE+) | Lacks guaranteed low-line accuracy; less suitable for tight-margin NMI timing | Select when cost sensitivity outweighs need for ±2% precision in brownout warning |
| TPS3823-46DBVR | Fixed 4.63V reset threshold, no low-line output or WDPO; 200ms timeout, 1.6µA quiescent current | No NMI capability or advanced watchdog features; simpler integration where only basic reset needed | Choose for ultra-low-power applications where dual-threshold and pulsed watchdog are unnecessary |
Compared with MAX792MEPE+, MAX820MEPE+ delivers tighter ±2% threshold tolerance essential for accurate low-line warning, while TPS3823-46DBVR offers lower power but omits NMI and WDPO-making MAX820MEPE+ optimal for systems requiring coordinated brownout response and fault-recovery staging.
Availability
MAX820MEPE+ is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, telecom line cards, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance.
Supply support for MAX820MEPE+ 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, medical, and communications applications, emphasizing reliability, accuracy, and integration.
The MAX820MEPE+ belongs to Maxim's µP supervisory product line, engineered specifically for deterministic power-monitoring in safety-critical embedded systems where reset timing, threshold accuracy, and fault-recovery staging are non-negotiable.
FAQ
What is the exact reset threshold voltage for MAX820MEPE+?
The MAX820MEPE+ has a nominal reset threshold voltage of 4.37V with ±2% accuracy over temperature and supply variation. This value is factory-trimmed and specified in the Electrical Characteristics table under "MAX820M" suffix; it applies to internal threshold mode with RESET IN/INT tied to GND. The threshold remains stable across the full operating temperature range (-40°C to +85°C).
Does MAX820MEPE+ support external reset threshold programming?
Yes, MAX820MEPE+ supports external programming mode. When RESET IN/INT is pulled above 600mV (e.g., via resistor divider), the internal voltage divider disconnects and both reset and low-line comparators use external thresholds set by resistors on LLIN/REFOUT and RESET IN/INT. The MAX820MEPE+ retains its ±2% accuracy advantage over MAX792 in this mode due to superior reference stability.
How does the watchdog function behave during power-down?
The watchdog function in MAX820MEPE+ is automatically disabled when VCC falls below the reset threshold. WDO and WDPO remain high during undervoltage, preventing spurious fault assertions. Once VCC rises above the threshold and reset deasserts, the watchdog timer resumes normal operation - ensuring reliable supervision only during valid operating conditions.
What is the purpose of the CE IN and CE OUT pins on MAX820MEPE+?
The CE IN and CE OUT pins implement a transmission gate that passes chip-enable signals only when reset is deasserted. During reset assertion, CE OUT is held low for up to 15µs if CE IN was low, guaranteeing completion of the current memory write cycle. This prevents data corruption in CMOS RAM or EEPROM during brownout, a core function explicitly designed into MAX820MEPE+.
Can MAX820MEPE+ generate a non-maskable interrupt (NMI)?
Yes, MAX820MEPE+ generates an NMI via the LOW LINE output, which asserts low 120mV above the reset threshold in internal mode. This provides early warning of impending brownout, allowing firmware to save state or initiate controlled shutdown before reset occurs - a key capability confirmed in the Typical Operating Circuit and Applications section of the MAX820MEPE+ datasheet.
MAX820MEPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX820MEPE+ FAQ
1.How can I place an order for MAX820MEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820MEPE+ 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 MAX820MEPE+ reliable?
The price and inventory of MAX820MEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820MEPE+ is usually 5 days.
3.What payment methods are accepted for MAX820MEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820MEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820MEPE+?
MAX820MEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820MEPE+ 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 MAX820MEPE+?
For technical support, including MAX820MEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820MEPE+ requirements.
6.How does Aetrix verify that MAX820MEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX820MEPE+ 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 MAX820MEPE+ meets industry standards.
7.What is the process for return or replacement of MAX820MEPE+?
All MAX820MEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820MEPE+, 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 MAX820MEPE+ part is unused and in its original packaging.
Return procedure for MAX820MEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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