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Analog Devices Inc./Maxim Integrated MAX820LEPE+
- Part No.:
- MAX820LEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX820LEPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:818
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Product details
Overview
MAX820LEPE+ 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 for power-up, brownout, and power-down conditions while providing RESET/RESET outputs, LOW LINE NMI signal, CE gating, and overvoltage detection - used in industrial controllers and embedded systems requiring reliable power sequencing and fault recovery.
For engineers reviewing the MAX820LEPE+ datasheet, MAX820LEPE+ pinout, MAX820LEPE+ application, or MAX820LEPE+ equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior (200ms reset delay, 70ns WDPO-to-WDO propagation), memory write-cycle completion support via CE gating, and accurate ±2% threshold validation - all confirmed for the MAX820L variant in 16-pin PDIP package.
Technical Context
The MAX820LEPE+ implements dual-comparator supervision: one for reset assertion at factory-set thresholds (4.62V nominal), another for low-line warning 120mV above reset threshold. Its internal 1.30V reference enables precise external programming mode when RESET IN/INT exceeds 600mV.
It integrates a programmable watchdog timer (1.6s default, adjustable via SWT capacitor), pulsed WDPO output preceding WDO by 70ns, and a chip-enable transmission gate with ≤10ns propagation delay and automatic write-cycle completion hold during power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V ±2% (MAX820L), ensuring stable reset assertion across temperature and supply variation |
| Reset Timeout Period | 200ms typical after VCC rise, guaranteeing µP initialization completes before code execution |
| Low-Line Threshold | 4.74V (120mV above reset), enabling early NMI alert prior to reset for graceful shutdown |
| Watchdog Timeout | 1.6s nominal (SWT = VCC), configurable via external capacitor for system-specific fault detection windows |
| CE Propagation Delay | ≤10ns max, allowing use with high-speed µPs without timing violation on memory access paths |
| Supply Current | 70µA typical at +25°C, supporting low-power embedded monitoring without burdening supply rails |
| Operating Voltage Range | 2.75V to 5.5V, compatible with both 3.3V and 5V logic domains and brownout down to 1V on RESET |
Pinout & Package
MAX820LEPE+ is housed in a 16-pin plastic DIP (PDIP) package with 0.3-inch width, lead-free finish (indicated by '+' suffix), and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET valid down to VCC = 1V |
| 3 | VCC | Main supply input (2.75–5.5V); powers all internal comparators, timers, and gates |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold; ≥600mV → external resistor-programmed thresholds |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 6, 7 | OVO / OVI | Uncommitted overvoltage comparator output/input; OVI threshold = 1.30V, no effect on other functions |
| 8 | SWT | Watchdog timeout control: connect to VCC for 1.6s default, or to GND via capacitor for custom timeout |
| 9 | MR | Manual-reset input with internal 1.30V comparator and 12µs propagation delay; no external pull-up needed |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold for pre-reset warning |
| 11 | WDI | Watchdog input; transition resets timer; static high/low >1.6s triggers WDPO/WDO assertion |
| 12 | GND | Ground reference for all analog comparators and digital logic |
| 13 | CE OUT | Chip-enable output gated during reset; holds low 15µs after reset if CE IN was low for write completion |
| 14 | CE IN | Chip-enable input passed to CE OUT only when reset inactive; high-impedance during reset |
| 15, 16 | WDO / WDPO | WDPO pulses low 70ns before WDO for advance warning; WDO latches low until next WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Reset Threshold Accuracy | Guaranteed for MAX820L variant, reducing need for margin-based design and enabling tighter supply tolerance |
| Two-Stage Power-Fail Warning | LOW LINE asserts 120mV above reset threshold, giving µP time to save state before reset occurs |
| Pulsed Watchdog Output (WDPO) | 70ns-advanced pulse enables external flip-flop latching for two-fault shutdown, not just single-event reset |
| Memory Write-Cycle Completion | CE OUT remains low 15µs after reset assertion if CE IN was low, preventing partial RAM writes during power-down |
| On-Board Chip-Enable Gating | Eliminates need for external logic to disable memory access during brownout, reducing BOM count and layout area |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Monitoring 5V supply rails in programmable logic controllers subject to voltage sags during motor switching. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET and LOW LINE to halt I/O scanning and trigger safe-state entry before brownout. Use Value: ±2% threshold accuracy prevents nuisance resets during nominal 5% line variation; 200ms timeout ensures firmware-controlled shutdown sequence completes. | Use Scenario: Ensuring deterministic boot and runtime integrity in portable ultrasound devices with battery-backed 3.3V logic. IC Role / Device Role / Timing Role: Providing guaranteed-valid RESET down to 1V during battery discharge, while WDPO/WDO detect software hangs in real-time image processing. Use Value: 10ns CE propagation delay preserves memory timing margins; pulsed WDPO enables fail-safe hardware lockout after two consecutive faults. |
| Telecom Base Station Management | Automotive Body Control Modules |
Use Scenario: Supervising auxiliary 5V supplies powering FPGA configuration and communication interfaces in remote radio units. IC Role / Device Role / Timing Role: Dual-comparator supervision detecting both slow droop (LOW LINE) and fast collapse (RESET), with OVI/OVO monitoring DC-DC converter overvoltage. Use Value: Independent overvoltage comparator provides redundant protection without affecting reset timing; external programming mode supports custom 4.4V reset for legacy 5V rail tolerance. | Use Scenario: Monitoring 5V microcontroller supply in body control modules exposed to load-dump transients and cold-crank conditions. IC Role / Device Role / Timing Role: Asserting RESET during cranking-induced brownout (<4.25V), while MR accepts pushbutton input for service-mode reset. Use Value: Manual-reset input with internal pull-up eliminates external resistor; 25µs MR pulse width requirement simplifies switch debouncing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792LEPE+ | Same pinout and function, but ±3% reset threshold accuracy (vs. ±2% for MAX820L) | Suitable where tighter threshold tolerance is not required; lower cost alternative | Select MAX792LEPE+ for cost-sensitive designs accepting wider threshold variance |
| TPS3823-46DBVR | Single-output (RESET only), no LOW LINE, WDPO, CE gating, or OVI/OVO; 4.63V threshold, ±0.5% accuracy | Limited to basic reset-only supervision; lacks NMI warning, memory protection, and watchdog features | Choose TPS3823-46DBVR only when full MAX820L feature set is unnecessary and footprint reduction is critical |
Compared with MAX792LEPE+, the MAX820LEPE+ provides tighter ±2% threshold accuracy for improved reliability in marginal supply conditions; compared with TPS3823-46DBVR, it delivers comprehensive supervision including dual-voltage warning, memory write protection, and advanced watchdog signaling - at the cost of larger package and higher pin count.
Availability
MAX820LEPE+ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, telecom infrastructure, and automotive electronics requiring stable component supply and long-term manufacturability.
Supply support for MAX820LEPE+ 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 connectivity applications.
The MAX820 belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power-monitoring and fault-recovery in mission-critical embedded systems operating across extended industrial temperature ranges.
FAQ
What is the reset threshold voltage for MAX820LEPE+ and how is it guaranteed?
The MAX820LEPE+ has a nominal reset threshold voltage of 4.62V with ±2% accuracy over temperature and supply voltage. This specification is guaranteed for the MAX820L variant per the official Maxim datasheet (Rev. 4, 11/05), and applies specifically to the internal threshold mode when RESET IN/INT is grounded. The ±2% tolerance ensures reliable reset assertion even under worst-case process, voltage, and temperature conditions - a key differentiator from the ±3% MAX792L.
Does MAX820LEPE+ support external programming of reset and low-line thresholds?
Yes, MAX820LEPE+ supports external programming mode. When RESET IN/INT is pulled above 600mV (e.g., via resistor divider), the internal voltage divider disconnects and LLIN/REFOUT becomes the low-line comparator input while RESET IN/INT serves as the reset comparator input. The MAX820LEPE+ retains its ±2% accuracy advantage in this mode when using precision external resistors, unlike the MAX792 which offers only ±3% in external mode.
How does the watchdog function behave in MAX820LEPE+ during power-down?
The watchdog function in MAX820LEPE+ is automatically disabled when VCC falls below the reset threshold. This prevents spurious WDO assertion during brownout or power-off sequences. WDPO and WDO remain high while VCC is below threshold, and the watchdog timer resumes operation only after VCC rises above the reset threshold and the 200ms reset timeout expires - ensuring clean restart behavior without false fault detection.
What is the purpose of the CE IN and CE OUT pins on MAX820LEPE+?
The CE IN and CE OUT pins on MAX820LEPE+ implement a transmission gate that passes chip-enable signals to memory devices only when the system is in valid operating condition. During reset assertion, CE OUT is forced high-impedance or held low (if CE IN was low) for 15µs to complete ongoing memory writes - preventing data corruption in CMOS RAM or EEPROM during power transitions. This eliminates need for external gating logic.
Can MAX820LEPE+ be used with 3.3V microcontrollers?
Yes, MAX820LEPE+ operates from 2.75V to 5.5V and supports 3.3V systems. Its reset outputs (RESET/RESET) are fully specified at VCC = 3V, with RESET sinking 1.6mA at 0.1V and sourcing 100µA at VCC – 0.5V. The watchdog timeout scales with supply (k = 16.2 at 5V, k = 27 at 3V), and all comparators - including MR, WDI, and OVI - function correctly across the full voltage range, making MAX820LEPE+ suitable for mixed-voltage designs.
MAX820LEPE+ 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:
- 4.62V
- 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
MAX820LEPE+ FAQ
1.How can I place an order for MAX820LEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820LEPE+ 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 MAX820LEPE+ reliable?
The price and inventory of MAX820LEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820LEPE+ is usually 5 days.
3.What payment methods are accepted for MAX820LEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820LEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820LEPE+?
MAX820LEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820LEPE+ 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 MAX820LEPE+?
For technical support, including MAX820LEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820LEPE+ requirements.
6.How does Aetrix verify that MAX820LEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX820LEPE+ 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 MAX820LEPE+ meets industry standards.
7.What is the process for return or replacement of MAX820LEPE+?
All MAX820LEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820LEPE+, 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 MAX820LEPE+ part is unused and in its original packaging.
Return procedure for MAX820LEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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