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Analog Devices Inc./Maxim Integrated MAX820RESE+
- Part No.:
- MAX820RESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820RESE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:191
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Product details
Overview
MAX820RESE+ 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 (MR), chip-enable gating, and overvoltage detection - designed for critical power monitoring in embedded controllers and industrial computing systems.
For engineers reviewing the MAX820RESE+ datasheet, MAX820RESE+ pinout, MAX820RESE+ application, or MAX820RESE+ equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing behavior (200ms reset delay, 70ns WDPO-to-WDO skew), exact package mapping (16-pin SO), and two rigorously cross-checked alternative parts for voltage-monitoring supervisory use cases.
Technical Context
The MAX820RESE+ implements dual independent comparators (reset and low-line) with factory-trimmed ±2% threshold accuracy, enabling precise brownout detection 120mV above the reset threshold. Its watchdog function uses an external capacitor on SWT to set timeout (k×CnF ms, k=16.2 at VCC=5V), while WDPO provides a 1.7ms advance pulse preceding WDO assertion by 70ns.
Chip-enable gating features a transmission gate with ≤10ns propagation delay and active-low CE OUT that remains latched low for 15µs after reset assertion if CE IN is low - ensuring memory write-cycle completion during power-down. The device operates from 2.75V to 5.5V and guarantees RESET validity down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.62V nominal (R-suffix), ±2% accuracy - ensures reliable brownout detection at defined supply rail margin |
| Power-Up Reset Delay | 200ms typical - holds µP in reset long enough for stable clock and supply settling |
| Watchdog Timeout (SWT=VCC) | 1.6s nominal - provides sufficient window for firmware recovery before hardware fault escalation |
| WDPO-to-WDO Skew | 70ns typical - enables precise timing of advance warning pulse relative to final shutdown signal |
| CE IN to CE OUT Delay | 10ns max - supports high-speed µP bus timing without violating setup/hold requirements |
| Supply Voltage Range | 2.75V to 5.5V - compatible with both 3.3V and 5V logic domains and mixed-voltage systems |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation |
Pinout & Package
MAX820RESE+ is housed in a 16-pin narrow SO (Small Outline) package, 3.9mm width, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET guaranteed valid down to VCC = 1V |
| 3 | VCC | Main supply input (2.75V–5.5V); powers all internal comparators, timers, and output drivers |
| 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 |
| 6, 7 | OVO / OVI | Uncommitted overvoltage comparator output/input; OVI threshold = 1.30V, no effect on other functions |
| 8 | SWT | Watchdog timeout programming node: connect to VCC for 1.6s default or to GND via capacitor for adjustable timeout |
| 9 | MR | Manual reset input with 1.30V threshold and 25µs minimum pulse width; internally pulled up to VCC |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold in internal mode; signals early supply degradation |
| 11 | WDI | Watchdog input; transition resets timer; no activity > timeout asserts WDPO then WDO |
| 12 | GND | Ground reference for all analog comparators and digital logic |
| 13 | CE OUT | Active-low chip-enable output gated by reset state; disables memory access during under-voltage |
| 14 | CE IN | Chip-enable input passed through transmission gate only when reset is deasserted |
| 15, 16 | WDO / WDPO | WDPO pulses low 1.7ms before WDO asserts; WDO remains latched low until next WDI transition |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset/low-line threshold accuracy | Enables deterministic brownout response without calibration; critical for safety-critical controllers |
| Programmable watchdog timeout | Capacitor-adjustable (SWT-to-GND) with k=16.2 @ 5V allows fine-tuned firmware recovery windows |
| Dual reset outputs (RESET/RESET) | Eliminates need for external inverters; RESET guaranteed functional down to VCC = 1V for deep brownout coverage |
| Chip-enable gating with write-cycle hold | CE OUT stays low 15µs after reset assertion if CE IN was low - prevents partial RAM writes during power collapse |
| Two-stage power-fail warning | LOW LINE asserts 120mV above reset threshold, providing early NMI for graceful shutdown before reset triggers |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Power sequencing and runtime supervision in programmable logic controllers with nonvolatile memory retention. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, low-line NMI, and watchdog-triggered safe state entry. Use Value: Prevents corrupted I/O configuration during brownout; ±2% thresholds ensure consistent trip points across temperature and unit variance. |
Use Scenario: Ensuring deterministic boot and fault containment in FDA-cleared imaging equipment with battery-backed SRAM. IC Role / Device Role / Timing Role: Dual-role supervisor: generates 200ms power-up reset and provides WDPO-pulsed hardware latch for double-fault shutdown. Use Value: WDPO's 70ns skew enables synchronous D-flip-flop capture; CE gating protects diagnostic data integrity during AC dropout. |
| Telecom Base Station Management | Automotive Infotainment ECUs |
Use Scenario: Monitoring 3.3V and 5V rails in remote radio head control modules subject to lightning-induced transients. IC Role / Device Role / Timing Role: Voltage monitor with overvoltage comparator (OVI/OVO) and manual reset for field service recovery. Use Value: OVI threshold fixed at 1.30V allows simple resistive divider for >5.5V overvoltage detection; MR supports technician-initiated reset without PCB modification. |
Use Scenario: Power supervision in head-unit mainboards where CAN communication must survive cold-crank events (4.5V–12V). IC Role / Device Role / Timing Role: Brownout detector with 4.62V reset threshold and 200ms delay, synchronized to ignition-on sequence. Use Value: R-suffix 4.62V threshold aligns with automotive 5V regulator dropout spec; ±2% tolerance avoids nuisance resets during load dump. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792RESE+ | Same pinout and function, but ±3% reset/low-line threshold accuracy (vs. ±2% for MAX820RESE+) | Suitable for cost-sensitive industrial controls where tighter accuracy not required | Select MAX792RESE+ when ±3% threshold tolerance meets system margin requirements and BOM cost reduction is prioritized |
| TPS3808G33DBVR | Single-output (active-low reset only), no WDPO, no CE gating, 3.3V fixed threshold, 200ms delay | Limited to basic reset generation; lacks dual reset, watchdog pulse, and memory protection features | Choose TPS3808G33DBVR only for simple 3.3V systems requiring minimal supervision without advanced fault escalation |
Compared with MAX792RESE+, the MAX820RESE+ delivers tighter ±2% threshold accuracy for improved brownout consistency, while TPS3808G33DBVR offers lower cost and smaller footprint but omits WDPO, CE gating, and dual reset - making it unsuitable for applications requiring memory write protection or two-stage fault response.
Availability
MAX820RESE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management, and automotive infotainment ECUs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX820RESE+ 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 in industrial, automotive, and communications markets.
The MAX820RESE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-fail response, memory write protection, and multi-level fault escalation in safety-aware embedded systems.
FAQ
What is the reset threshold voltage for MAX820RESE+?
The MAX820RESE+ has a nominal reset threshold voltage of 4.62V, with ±2% accuracy over temperature and supply variation. This value is specified for the 'R' suffix variant and is factory-trimmed - confirmed in the Electrical Characteristics table under "Reset Threshold Voltage-Internal Threshold Mode" for MAX820R devices at TA = +25°C.
Does MAX820RESE+ support external reset threshold programming?
Yes, MAX820RESE+ supports external reset threshold programming via the RESET IN/INT pin. When biased above 600mV, it disconnects internal dividers and routes external resistor networks to LLIN/REFOUT and RESET IN/INT pins - enabling custom low-line and reset thresholds as detailed in Figure 4b of the datasheet.
What is the function of the WDPO pin on MAX820RESE+?
The WDPO (Watchdog-Pulse Output) pin on MAX820RESE+ delivers a 1.7ms low pulse 70ns before WDO asserts during watchdog timeout. This advance warning enables external logic (e.g., D flip-flop) to initiate controlled shutdown sequences - a key feature distinguishing MAX820RESE+ from basic reset supervisors.
Can MAX820RESE+ be used with 3.3V systems?
Yes, MAX820RESE+ operates from 2.75V to 5.5V and supports 3.3V systems. Its reset thresholds are voltage-mode (not ratio-based), so the 4.62V R-suffix variant remains valid at 3.3V supply - though system design must ensure VCC never drops below 2.75V during operation per Absolute Maximum Ratings.
How does the chip-enable gating work on MAX820RESE+?
MAX820RESE+ gates CE signals using an internal transmission gate between CE IN and CE OUT. During reset assertion, CE OUT is forced low and held for 15µs if CE IN was low - ensuring memory write cycles complete before power collapse. Propagation delay is ≤10ns, supporting high-speed µP buses.
MAX820RESE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.61V
- 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
MAX820RESE+ FAQ
1.How can I place an order for MAX820RESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820RESE+ 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 MAX820RESE+ reliable?
The price and inventory of MAX820RESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820RESE+ is usually 5 days.
3.What payment methods are accepted for MAX820RESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820RESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820RESE+?
MAX820RESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820RESE+ 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 MAX820RESE+?
For technical support, including MAX820RESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820RESE+ requirements.
6.How does Aetrix verify that MAX820RESE+ is sourced from the original manufacturer or authorized distributors?
All MAX820RESE+ 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 MAX820RESE+ meets industry standards.
7.What is the process for return or replacement of MAX820RESE+?
All MAX820RESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820RESE+, 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 MAX820RESE+ part is unused and in its original packaging.
Return procedure for MAX820RESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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