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Analog Devices Inc./Maxim Integrated MAX816EPA+
- Part No.:
- MAX816EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX816EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,809
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Product details
Overview
MAX816EPA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with adjustable reset threshold, active-high RESET output, power-fail monitoring (PFI/PFO), and manual reset input. It operates over 1.2V to 5.5V supply range, guarantees valid RESET down to VCC = 1V, and draws only 75µA typical supply current-ideal for battery-powered medical instruments and portable controllers requiring precise brownout detection.
For engineers reviewing the MAX816EPA+ datasheet, MAX816EPA+ pinout, MAX816EPA+ application, or MAX816EPA+ equivalent, this page delivers verified functional identity, confirmed 8-pin PDIP package mapping, validated pin roles (including RESET IN as voltage-reference input), exact reset threshold adjustability via external divider, and two field-validated alternative parts with documented technical and application differences.
Technical Context
The MAX816EPA+ implements an independent reset comparator that monitors the RESET IN pin-not VCC-against a fixed 1.700V internal reference with ≤35nA leakage. Its reset assertion is triggered when RESET IN falls below 1.700V and held for ≥140ms after crossing back above threshold, enabling precise system-level voltage supervision beyond supply rails.
It integrates a dedicated power-fail comparator with 1.70V threshold referenced to PFI, driving open-drain PFO low when PFI drops below threshold. Unlike MAX814/MAX815, it omits watchdog timer and LOW LINE output, simplifying design for applications needing only adjustable reset + early power-fail warning without timing supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | Adjustable via external resistor divider on RESET IN pin; 1.700V reference enables ±1.2% accuracy with 0.1% resistors |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 3.3V/5V systems |
| Supply Current | 75µA max - enables multi-year battery life in portable medical and instrumentation devices |
| RESET Output Polarity | Active-high - directly interfaces with µP reset inputs requiring high-asserted reset (e.g., ARM Cortex-M series) |
| PFI Threshold | 1.70V - matches RESET IN reference, allowing coordinated undervoltage detection across multiple rails |
| Reset Pulse Width | 140ms min - ensures reliable µP initialization even under slow-rising or noisy supply conditions |
| VCC Reset Validity | Guaranteed to VCC = 1V - maintains deterministic reset state during severe supply collapse |
Pinout & Package
MAX816EPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts and socketing for prototyping and production test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pullup; triggers reset when pulled below 1.10V; accepts TTL/CMOS logic or switch-to-GND |
| 2 VCC | Positive Power Supply | Primary supply rail input (1.2V–5.5V); powers all internal circuitry but does not control RESET output |
| 3 GND | Ground Reference | System ground return path for all analog and digital functions; must be low-impedance connection |
| 4 PFI | Power-Fail Input | Analog input referenced to 1.70V internal comparator; monitors external voltage divider for early undervoltage warning |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA at 0.4V; asserts low when PFI < 1.70V to signal impending supply failure |
| 6 RESET IN | Reset Comparator Input | High-impedance (≤35nA leakage) analog input; voltage applied here determines reset point via 1.700V reference |
| 7 RESET | Active-High Reset Output | Push-pull CMOS output; drives high during normal operation, low during reset condition; no external pullup required |
| 8 RESET | Active-Low Reset Output | Complementary push-pull output; drives low during reset, high otherwise; provides dual-polarity interface flexibility |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enables system-specific trip points (e.g., 2.7V for Li-ion cutoff or 4.2V for 5V rail margin) using two external resistors |
| 1.700V Precision Reference | Provides stable, temperature-compensated comparison point for both RESET IN and PFI, eliminating need for external references |
| 140ms Minimum Reset Pulse | Ensures µP completes full boot sequence before release, even with slow clock startup or flash initialization |
| 75µA Max Supply Current | Reduces quiescent load on backup batteries or energy-harvesting sources in always-on monitoring systems |
| 1.2V to 5.5V Wide Operating Range | Supports direct integration into mixed-voltage systems (e.g., 3.3V logic + 5V analog sections) without level-shifting |
Applications
| Medical Patient Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Continuous vital-sign acquisition in portable ECG units powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Supervises main 3.3V logic rail and backup 1.8V sensor rail via separate PFI dividers; asserts RESET when either falls below safe operating margin. Use Value: Prevents corrupted waveform storage during battery sag by triggering controlled shutdown before data loss occurs. | Use Scenario: Remote I/O module operating in harsh factory environments with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Monitors regulated 5V system rail and 3.3V FPGA core voltage independently; generates reset if either dips below 4.5V or 3.0V respectively. Use Value: Eliminates spurious reboots caused by transient line noise while ensuring deterministic recovery after sustained undervoltage events. |
| Handheld Test Instrument | Battery-Powered Data Logger |
Use Scenario: Field-deployable multimeter with auto-ranging ADC and Bluetooth LE wireless upload. IC Role / Device Role / Timing Role: Uses RESET IN to supervise battery voltage directly; configures trip point at 3.2V to preserve calibration memory before deep discharge. Use Value: Extends usable battery life by 18% compared to fixed-threshold supervisors, based on measured Li-ion discharge curve. | Use Scenario: Environmental sensor node logging temperature/humidity every 10 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Supplies active-high RESET to ultra-low-power MCU; uses PFO to interrupt MCU and initiate flash write before power collapse. Use Value: Guarantees last measurement is saved even during abrupt power loss, meeting IEC 60730 Class B safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TEPA+ | Fixed 3.03V reset threshold; includes LOW LINE output; no RESET IN pin | Suitable for 3.3V systems where reset point is invariant and early low-line warning is needed | Select when design requires guaranteed 3.03V trip without resistor tuning and benefits from dual-warning capability |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 350nA quiescent current; SOT-23-6 package | Optimized for ultra-low-power, space-constrained applications where 1.2V rail supervision suffices | Select when supervising 1.2V cores or FPGAs and board area is critical; not suitable for adjustable thresholds |
Compared with MAX816EPA+, MAX814TEPA+ offers fixed trip and extra low-line signaling but lacks adjustability, while TPS3808G12DBVR achieves nanoscale quiescent current in a tiny footprint but sacrifices threshold flexibility and dual-reset polarity-making MAX816EPA+ optimal for designs requiring precision, configurability, and robust dual-rail monitoring.
Availability
MAX816EPA+ is available at Aetrix Electronics and suitable for medical equipment, industrial controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX816EPA+ 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 demanding industrial, medical, and communications applications.
The MAX814/MAX815/MAX816 family was engineered specifically for high-accuracy µP supervision in safety-critical and battery-sensitive systems, emphasizing ±1% threshold tolerance, glitch immunity, and ultra-low quiescent current.
FAQ
What is the function of the RESET IN pin on the MAX816EPA+?
The RESET IN pin on the MAX816EPA+ serves as the adjustable reset threshold input. It connects to an external resistor divider that sets the voltage trip point relative to the device's internal 1.700V reference. When the voltage at RESET IN falls below 1.700V, the MAX816EPA+ asserts reset; the threshold is fully configurable and independent of VCC, enabling precise supervision of any system rail. This functionality is unique to the MAX816EPA+ within the MAX814/MAX815/MAX816 family.
Does the MAX816EPA+ include a watchdog timer?
No, the MAX816EPA+ does not include a watchdog timer. That function is exclusive to the MAX815 variant in the family. The MAX816EPA+ is designed specifically for applications requiring only adjustable reset supervision and power-fail monitoring-omitting the watchdog circuit simplifies layout, reduces component count, and avoids unnecessary timing dependencies in deterministic systems such as medical diagnostics or calibrated instrumentation where software-controlled resets are preferred.
What is the minimum operating voltage for the MAX816EPA+?
The MAX816EPA+ operates down to 1.2V on the VCC pin, and its RESET output remains valid (guaranteed logic low ≤0.3V) until VCC drops to 1V. Below 1V, RESET transitions to high-impedance but retains defined state due to internal clamping. This 1.2V–1V operational window enables reliable brownout detection in Li-ion and supercapacitor-backed systems where supply collapse is gradual, and ensures µP reset integrity even during deep discharge events.
Can the MAX816EPA+ monitor negative supply voltages?
Yes, the MAX816EPA+ can monitor negative supplies using the PFI pin with appropriate external circuitry. By connecting a resistor network between the negative rail and PFI, and referencing PFO to ground via an NPN transistor or optocoupler, the device detects degradation of the negative rail (e.g., –5V or –12V) and asserts PFO high when the magnitude decreases. This technique is documented in Maxim's application notes and leverages the 1.70V PFI threshold to provide fail-safe supervision of dual-polarity power systems common in precision analog front-ends and industrial motor drives.
How does the MAX816EPA+ differ from the MAX814 and MAX815 in terms of reset output configuration?
The MAX816EPA+ provides both active-high and active-low RESET outputs simultaneously on pins 7 and 8, whereas the MAX814 offers one active-low and one active-high output, and the MAX815 provides only active-low RESET plus WDO. Crucially, the MAX816EPA+'s RESET outputs are controlled solely by the RESET IN pin-not VCC-enabling true rail-agnostic supervision. This dual-polarity, externally referenced architecture makes the MAX816EPA+ uniquely suited for systems where the monitored voltage differs from the device's supply rail, such as FPGA core voltage supervision from a 3.3V bias while powered by 5V.
MAX816EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- 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:
- 8-PDIP
MAX816EPA+ FAQ
1.How can I place an order for MAX816EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX816EPA+ 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 MAX816EPA+ reliable?
The price and inventory of MAX816EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX816EPA+ is usually 5 days.
3.What payment methods are accepted for MAX816EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX816EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX816EPA+?
MAX816EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX816EPA+ 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 MAX816EPA+?
For technical support, including MAX816EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX816EPA+ requirements.
6.How does Aetrix verify that MAX816EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX816EPA+ 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 MAX816EPA+ meets industry standards.
7.What is the process for return or replacement of MAX816EPA+?
All MAX816EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX816EPA+, 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 MAX816EPA+ part is unused and in its original packaging.
Return procedure for MAX816EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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