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Analog Devices Inc./Maxim Integrated MAX820TESE+
- Part No.:
- MAX820TESE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820TESE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
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Product details
Overview
MAX820TESE+ from Maxim Integrated is a microprocessor supervisory circuit with dual reset outputs (RESET/RESET), ±2% reset threshold accuracy, 200ms power-up reset delay, and integrated watchdog timer with programmable timeout. It monitors VCC for brownout detection, provides manual reset input, low-line warning, overvoltage comparator, and chip-enable gating for nonvolatile memory protection in embedded control systems.
For engineers reviewing the MAX820TESE+ datasheet, MAX820TESE+ pinout, MAX820TESE+ application, or MAX820TESE+ equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, memory write-cycle completion support, and validated alternative options for industrial µP power monitoring designs.
Technical Context
The MAX820TESE+ implements dual independent comparators (reset and low-line) with factory-trimmed ±2% threshold accuracy, enabling precise brownout detection at 2.61V (T suffix). Its internal watchdog uses an external capacitor on SWT to set timeout periods (e.g., 1.6s nominal with SWT = VCC), and asserts WDPO 70ns before WDO for hardware shutdown sequencing.
It features a bidirectional CE transmission gate with ≤10ns propagation delay and automatic write-cycle completion hold during power-down; CE IN becomes high-impedance when reset is active, while CE OUT remains low for 15µs if CE IN was low at reset assertion-ensuring RAM write integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.61V (±2%) - guarantees reliable brownout detection at precisely defined VCC level |
| Power-Up Reset Delay | 200ms typ - ensures µP remains held in reset until supply stabilizes post-power-on |
| Watchdog Timeout Period | 1.6s nominal (SWT = VCC) - provides software fault detection window before hardware shutdown |
| Chip-Enable Propagation Delay | ≤10ns max - enables use with high-speed µPs without timing violation |
| RESET Output Validity Range | VCC down to 1V - maintains valid reset signal even during deep brownout conditions |
| Low-Line Threshold Offset | 120mV above reset threshold - delivers advance NMI warning before reset assertion |
| Supply Current | 70µA typ at +25°C - supports low-power embedded operation without burdening supply |
Pinout & Package
MAX820TESE+ is housed in a 16-pin narrow SOIC (SO) package with 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix).
| 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 to 5.5V); powers all internal circuits and output drivers |
| 4 | RESET IN/INT | Mode select: ≤60mV → internal threshold mode; ≥600mV → external resistor-programmable thresholds |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 6 | OVO | Open-drain overvoltage comparator output; goes low when OVI > 1.30V |
| 7 | OVI | Inverting input of uncommitted overvoltage comparator; connect to GND if unused |
| 8 | SWT | Watchdog timeout programming node; capacitor to GND sets custom timeout period |
| 9 | MR | Manual-reset input with internal 1.30V comparator and 25µs minimum pulse width requirement |
| 10 | LOW LINE | Active-low NMI output asserted 120mV above reset threshold in internal mode |
| 11 | WDI | Watchdog input; transition resets timer; no activity > timeout asserts WDPO/WDO |
| 12 | GND | Ground reference for all analog and digital functions |
| 13 | CE OUT | Active-low 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; high-impedance during reset to isolate memory bus |
| 15 | WDO | Watchdog fault output; goes low on timeout and stays low until next WDI transition |
| 16 | WDPO | Watchdog pulse output; 500µs–6ms low pulse preceding WDO by 70ns for flip-flop clocking |
Key Features
| Feature | Design Value |
|---|---|
| ±2% reset threshold accuracy | Enables deterministic brownout response without calibration; critical for safety-critical controllers |
| Programmable watchdog timeout | Capacitor-based tuning (e.g., 4.7nF → ~127ms at 5V) allows precise match to firmware execution cycles |
| Memory write-cycle completion | CE OUT holds low 15µs after reset assertion if CE IN was low, ensuring RAM writes finish before disable |
| Dual reset outputs (RESET/RESET) | Eliminates need for external inverters; supports both active-high and active-low µP reset inputs |
| Two-stage power-fail warning | LOW LINE asserts 120mV above reset threshold, giving µP time to save state before hard reset |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Monitors 3.3V logic supply in a DIN-rail mounted PLC with isolated I/O and real-time OS. IC Role / Device Role / Timing Role: Provides 200ms power-up reset hold, 2.61V brownout detection, and watchdog supervision of main CPU task scheduler. Use Value: Prevents spurious startup and ensures deterministic recovery from voltage sags during motor switching transients. |
Use Scenario: Supervises dual 5V/3.3V rails in portable ultrasound imaging device with flash memory storage. IC Role / Device Role / Timing Role: Generates NMI via LOW LINE 120mV before reset to trigger emergency data save; gates CE to protect acquired image buffers. Use Value: Guarantees lossless capture of last valid frame during battery depletion or AC dropout. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Embedded in CAN-connected BCM managing door locks, lighting, and HVAC with EEPROM configuration storage. IC Role / Device Role / Timing Role: Uses MR for service-mode reset; external resistor divider configures reset at 4.37V to match automotive cold-crank profile. Use Value: Maintains functional safety compliance by preventing EEPROM corruption during 6V brownout events. |
Use Scenario: Secures metrology SoC and FRAM data logger in ANSI C12.22-compliant smart meter operating from 3.3V rail. IC Role / Device Role / Timing Role: Applies CE gating to prevent partial writes during line-voltage dips; uses WDPO to clock external latch for permanent fault logging. Use Value: Ensures regulatory-grade data integrity across 20-year field deployment under fluctuating grid conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792TESE+ | Same pinout and function, but ±2.5% reset threshold accuracy (vs. ±2% for MAX820TESE+) | Suitable where tighter threshold tolerance is not required; lower cost in volume | Select MAX792TESE+ only if design tolerates wider reset voltage variation (e.g., non-safety-critical consumer devices) |
| TPS3808G33DBVR | Single reset output, fixed 3.3V threshold, no low-line/NMI output or CE gating | Lacks dual reset, memory protection, and advance warning capability - limited to basic reset-only use cases | Choose TPS3808G33DBVR only when system requires only simple reset generation without memory or watchdog features |
Compared with MAX792TESE+, the MAX820TESE+ offers superior threshold accuracy for deterministic brownout response; compared with TPS3808G33DBVR, it delivers full supervisory functionality including NMI warning, CE gating, and dual watchdog outputs - making it irreplaceable in systems requiring memory integrity and layered fault response.
Availability
MAX820TESE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX820TESE+ 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.
The MAX820 belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power-monitoring and memory protection in mission-critical embedded systems with demanding reliability requirements.
FAQ
What is the exact reset threshold voltage for MAX820TESE+?
The MAX820TESE+ has a nominal reset threshold voltage of 2.61V with ±2% accuracy over temperature. This value corresponds to the 'T' suffix in the part number and is factory-trimmed - confirmed in the Electrical Characteristics table under "MAX820T, TA = +25°C, VCC falling". The MAX820TESE+ maintains this specification across its –40°C to +85°C operating range.
Does MAX820TESE+ support external programming of reset and low-line thresholds?
Yes, the MAX820TESE+ supports external programming via the RESET IN/INT pin. When pulled ≥600mV, it disconnects internal references and allows resistor dividers on LLIN/REFOUT and RESET IN/INT to set custom thresholds - detailed in Figure 4b and the "External Programming Mode" section of the datasheet. The MAX820TESE+ retains ±2% accuracy only in internal mode; external mode accuracy depends on resistor tolerance and reference drift.
How does the chip-enable gating function work in MAX820TESE+?
The MAX820TESE+ uses a transmission gate between CE IN and CE OUT that disables during reset assertion. If CE IN is low when reset activates, CE OUT remains low for 15µs to complete the current memory write cycle - explicitly stated in the Pin Description for CE OUT and confirmed in the "Chip-Enable Signal Gating" section. This prevents partial writes to CMOS RAM or EEPROM during brownout.
What is the watchdog timeout behavior of MAX820TESE+ when VCC drops below the reset threshold?
The watchdog function in MAX820TESE+ is automatically disabled when VCC falls below the reset threshold - stated in the "Watchdog Function" section: "When VCC is below the reset threshold, the watchdog function is disabled." This prevents false timeouts during power failure and ensures WDO and WDPO remain inactive until VCC recovers and reset deasserts.
Can MAX820TESE+ generate a non-maskable interrupt (NMI) signal?
Yes, the MAX820TESE+ generates an NMI-capable signal via the LOW LINE output. In internal threshold mode, LOW LINE asserts 120mV above the reset threshold - providing advance warning before reset - and is explicitly intended for connection to the µP's NMI pin as shown in Figure 4a and described in the "Low-Line Output" section. This enables graceful shutdown or state save prior to hard reset.
MAX820TESE+ 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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- 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
MAX820TESE+ FAQ
1.How can I place an order for MAX820TESE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820TESE+ 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 MAX820TESE+ reliable?
The price and inventory of MAX820TESE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820TESE+ is usually 5 days.
3.What payment methods are accepted for MAX820TESE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820TESE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820TESE+?
MAX820TESE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820TESE+ 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 MAX820TESE+?
For technical support, including MAX820TESE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820TESE+ requirements.
6.How does Aetrix verify that MAX820TESE+ is sourced from the original manufacturer or authorized distributors?
All MAX820TESE+ 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 MAX820TESE+ meets industry standards.
7.What is the process for return or replacement of MAX820TESE+?
All MAX820TESE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX820TESE+, 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 MAX820TESE+ part is unused and in its original packaging.
Return procedure for MAX820TESE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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