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Analog Devices Inc./Maxim Integrated MAX816ESA+T
- Part No.:
- MAX816ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX816ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
The MAX816ESA+T from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit featuring adjustable reset threshold, power-fail monitoring, and manual reset input - with ±1% worst-case reset threshold accuracy, 75µA max supply current, and guaranteed RESET validity down to VCC = 1.0V. It serves as a system-level voltage monitor and reset controller in battery-powered embedded controllers requiring precise brownout detection and orderly shutdown.
For engineers reviewing the MAX816ESA+T datasheet, MAX816ESA+T pinout, MAX816ESA+T application, or MAX816ESA+T equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset threshold behavior (via external divider), power-fail comparator reference (1.70V), and validated alternative options for 3V/5V µP supervision.
Technical Context
The MAX816ESA+T uses an internal 1.700V precision reference to monitor the voltage at the RESET IN pin - not VCC - enabling fully adjustable reset thresholds via external resistor dividers. Its power-fail comparator compares PFI against the same 1.70V reference, with PFO asserting low when PFI falls below threshold.
Unlike the MAX814/MAX815, the MAX816ESA+T omits watchdog functionality and active-low/high dual RESET outputs; it provides only one active-low RESET output and relies on external logic for reset inversion if needed. All timing parameters - including 140ms minimum reset pulse width and MR-to-RESET delay of ≤250ns - are specified across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | Adjustable via external divider; reference = 1.700V at RESET IN pin; supports ±1.2% accuracy with 0.1% resistors |
| Supply Current | 75µA max at +25°C; enables use in always-on portable/battery systems without significant drain |
| RESET Validity Range | Guaranteed logic-low RESET output down to VCC = 1.0V (ISINK = 50µA), ensuring reliable assertion during deep brownout |
| Power-Fail Reference | Fixed 1.70V comparator threshold on PFI; PFO sinks ≥1.2mA when asserted, suitable for µP interrupt signaling |
| Manual Reset Input | MR pin accepts CMOS/TTL logic; internal 150µA pullup; triggers reset when pulled <1.10V; tMR min = 150ns |
| Operating Voltage | VCC = 1.2V to 5.5V; functional across full range, with specifications validated at 3.06V–5.5V for +3V/+5V systems |
| Reset Pulse Width | tRS = 140ms (min), 200ms (typ), 250ms (max); ensures µP initialization completes before release |
Pinout & Package
MAX816ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix). Pin spacing is 1.27mm, body width 3.9mm, and total package dimensions conform to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS-compatible input; internal 150µA pullup to VCC; asserts RESET when <1.10V |
| 2 VCC | Positive Power Supply | Primary supply rail; device operates from 1.2V–5.5V; RESET state determined by RESET IN, not VCC |
| 3 GND | Ground Reference | Analog/digital common return; must be low-impedance for accurate comparator operation |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 1.70V; monitors external voltage divider for early warning |
| 5 PFO | Power-Fail Output | Open-drain output; sinks ≥1.2mA when PFI < 1.70V; connects to µP interrupt or reset logic |
| 6 RESET IN | Adjustable Reset Comparator Input | High-Z input (≤35nA leakage); voltage divider sets trip point; reference = 1.700V |
| 7 RESET | Reset Output | Active-low open-drain output; sinks ≥3.2mA at VCC = 5V; requires external pullup for logic-high level |
| 8 NC | No Connect | Internally unconnected; must remain floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Set via external R1/R2 divider on RESET IN; enables custom trip points for diverse supply rails (e.g., 2.5V, 3.3V, 5V) |
| ±1% Worst-Case Accuracy | Applies to 1.700V internal reference and RESET IN comparator; ensures predictable reset timing across temp/voltage |
| Low-Power Operation | 75µA max supply current enables integration into energy-sensitive applications like medical wearables and IoT sensors |
| Power-Fail Early Warning | PFI/PFO pair provides fail-safe undervoltage detection independent of reset function; supports graceful shutdown sequencing |
| Glitch-Immune Reset Logic | Designed to ignore fast VCC transients ≤30µs (at 100mV overdrive); prevents spurious resets in noisy environments |
Applications
| Medical Wearables | Industrial Controllers |
|---|---|
|
Use Scenario: Battery-powered glucose monitor with real-time sensor data logging and BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; triggers controlled shutdown when battery drops below 2.8V using adjustable RESET IN divider. Use Value: Prevents corrupted flash writes during brownout by asserting RESET before VCC reaches 1.0V, leveraging guaranteed 50µA sink capability. |
Use Scenario: Programmable logic controller (PLC) I/O module operating from 24V DC converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Monitors 5V logic rail via RESET IN divider and 24V field power via PFI divider for dual-rail fault detection. Use Value: Enables simultaneous reset assertion and NMI interrupt (via PFO) to initiate safe I/O state freeze and EEPROM save before power collapse. |
| Smart Energy Meters | Portable Test Equipment |
|
Use Scenario: Revenue-grade electricity meter with tamper detection, RTC backup, and isolated comms. IC Role / Device Role / Timing Role: Provides primary reset for main µP and secondary reset enable for RTC supervisor via PFO-controlled enable line. Use Value: Ensures RTC remains powered and functional during main µP reset cycles, preserving timekeeping integrity across brownouts. |
Use Scenario: Handheld oscilloscope with rechargeable Li-ion battery and FPGA-based signal processing. IC Role / Device Role / Timing Role: Supervises 3.3V FPGA core rail and 1.2V analog front-end rail using separate PFI dividers; RESET IN set to 2.95V. Use Value: Guarantees FPGA configuration reload only after stable 3.3V is confirmed, avoiding partial bitstream load failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TESA+ | Fixed 3.03V reset threshold (±1%), no RESET IN pin; includes LOW LINE output; same 8-pin SO package | Best for cost-sensitive designs where 3.03V threshold suffices and low-line warning is required | Select MAX814TESA+ when fixed-threshold simplicity and brownout warning are prioritized over adjustability |
| TPS3808G33DBVR | Fixed 3.3V threshold (±0.5%), 1.8µA quiescent current, push-pull RESET, no PFI/PFO; SOT-23-6 package | Suitable for ultra-low-power, space-constrained applications lacking need for power-fail signaling | Choose TPS3808G33DBVR only if PFI/PFO functionality is unnecessary and board area is critical |
Compared with MAX816ESA+T, MAX814TESA+ offers identical package and power-fail capability but lacks adjustability, while TPS3808G33DBVR reduces size and current draw at the expense of PFI/PFO and reset flexibility - making MAX816ESA+T uniquely suited for multi-rail, field-serviceable, or configurable power-monitoring systems.
Availability
MAX816ESA+T is available at Aetrix Electronics and suitable for medical wearables, industrial controllers, smart energy meters, and portable test equipment requiring stable component supply with long-term lifecycle support.
Supply support for MAX816ESA+T 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-reliability µP supervision in battery-backed and multi-voltage systems, emphasizing accuracy, low power, and robust noise immunity.
FAQ
What is the reset threshold voltage of the MAX816ESA+T?
The MAX816ESA+T does not have a fixed reset threshold. Its reset point is set externally via a resistor divider on the RESET IN pin, referenced to an internal 1.700V comparator. For example, using R1 = 100kΩ and R2 = 100kΩ yields a ~3.4V trip point. The MAX816ESA+T achieves ±1.2% accuracy with 0.1% resistors, and its datasheet provides the exact calculation formula.
Does the MAX816ESA+T include a watchdog timer?
No, the MAX816ESA+T does not include a watchdog timer. That function is exclusive to the MAX815 variant. The MAX816ESA+T provides only reset supervision, manual reset input, and power-fail monitoring via PFI/PFO. If watchdog functionality is required, MAX815ESA+T is the appropriate pin-compatible alternative in the same family.
Can the MAX816ESA+T monitor voltages other than VCC?
Yes - the MAX816ESA+T is explicitly designed for monitoring arbitrary voltages. RESET IN accepts any divided-down voltage for reset assertion, and PFI accepts another independently scaled voltage for power-fail warning. Both inputs are high-impedance (≤35nA leakage), enabling monitoring of 12V, 24V, or negative rails using appropriate resistor networks, as documented in Figures 11 and 12 of the MAX816ESA+T datasheet.
What is the purpose of the NC pin on the MAX816ESA+T?
Pin 8 of the MAX816ESA+T is designated NC (No Connect) and is internally unconnected. It must not be used as a signal or power path. Per Maxim's layout guidance, it may be left floating or tied to GND to improve mechanical stability and reduce EMI susceptibility - but it must never be connected to VCC or driven actively.
How does the MAX816ESA+T behave during deep brownout (VCC < 1.0V)?
Below VCC = 1.0V, the MAX816ESA+T guarantees RESET remains a valid logic-low output (≤0.4V at ISINK = 50µA) until VCC drops out completely. Once VCC falls below ~0.8V, RESET transitions to high-impedance (open-drain off-state). To ensure it stays low, a pull-down resistor (e.g., 100kΩ to GND) is recommended - as shown in Figure 10 of the MAX816ESA+T datasheet.
MAX816ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX816ESA+T FAQ
1.How can I place an order for MAX816ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX816ESA+T 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 MAX816ESA+T reliable?
The price and inventory of MAX816ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX816ESA+T is usually 5 days.
3.What payment methods are accepted for MAX816ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX816ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX816ESA+T?
MAX816ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX816ESA+T 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 MAX816ESA+T?
For technical support, including MAX816ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX816ESA+T requirements.
6.How does Aetrix verify that MAX816ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX816ESA+T 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 MAX816ESA+T meets industry standards.
7.What is the process for return or replacement of MAX816ESA+T?
All MAX816ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX816ESA+T, 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 MAX816ESA+T part is unused and in its original packaging.
Return procedure for MAX816ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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