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Analog Devices Inc./Maxim Integrated MAX817MESA
- Part No.:
- MAX817MESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX817MESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,069
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Product details
Overview
MAX817MESA from Maxim Integrated is a +5V microprocessor supervisory circuit providing active-low reset, battery backup switchover, and power-fail monitoring in a space-saving 8-pin µMAX package. It features a 4.40V reset threshold (±10%), 200ms reset timeout, 11µA quiescent supply current, and operates across 0°C to +70°C. It is used in portable embedded controllers to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX817MESA datasheet, MAX817MESA pinout, MAX817MESA application, or MAX817MESA equivalent, this page delivers verified functional specifications, validated pin roles, confirmed reset timing behavior, battery switchover thresholds, and real-world use cases in battery-powered µP systems requiring deterministic reset assertion and low-power backup operation.
Technical Context
The MAX817MESA integrates a precision voltage monitor with 4.40V ±10% reset threshold, a 200ms internal reset timeout timer, and a dedicated power-fail comparator (PFI/PFO) that asserts low when input falls below 1.25V. Its battery switchover circuit activates when VCC drops below both VRST (4.40V) and VBATT, connecting BATT to OUT via an 80Ω P-channel MOSFET switch.
It supports backup-battery operation with <1µA standby current when VCC < VBATT − 0.2V, includes a battery freshness seal enabled by latching PFO low during power cycling, and ignores fast transients on VCC due to internal hysteresis and comparator design - all without watchdog or manual reset functionality (distinguishing it from MAX818/MAX819 variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - triggers active-low RESET when VCC falls below this level, ensuring µP reset during brownout in +5V systems. |
| Reset Timeout Period | 200ms typical - guarantees minimum RESET pulse width after power-up or VCC recovery, meeting µP reset timing requirements. |
| Supply Current | 11µA typical - enables multi-year battery life in portable applications with no external biasing required. |
| Battery Switchover Threshold | VCC < VBATT - switches OUT from VCC to BATT only when both VCC < VRST and VCC < VBATT, preventing premature switchover. |
| Power-Fail Comparator Input | PFI threshold = 1.25V - provides independent undervoltage detection for secondary supplies or low-battery warning signals. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control environments, not extended industrial or automotive ranges. |
| Package | 8-pin µMAX (3mm × 3mm) - surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MAX817MESA is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad for improved power dissipation in compact portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Supply output / RAM backup rail | Switches between VCC and BATT; connects to CMOS RAM VDD to maintain data during power loss. |
| 2 - VCC | Main +5V supply input | Primary power source; monitored for reset generation and switchover logic; must be ≥4.5V for MAX817M operation. |
| 3 - GND | Ground reference | 0V return for all internal comparators, timers, and output drivers; requires low-impedance connection to system ground plane. |
| 4 - PFI | Power-fail comparator input | Monitors external voltage (e.g., secondary supply); asserts PFO low when input <1.25V, enabling fail-safe signaling. |
| 5 - PFO | Power-fail comparator output | Open-drain output; pulled low when PFI <1.25V or VCC < VBATT; used for battery freshness seal enable or NMI assertion. |
| 6 - WDI | Watchdog input | Not functional in MAX817 - unused pin; must be left open or tied to GND/VCC; no watchdog timer present in this variant. |
| 7 - RESET | Active-low reset output | Drives µP reset pin low for ≥200ms during power-up, brownout, or PFO-triggered events; sinks 3.2mA min. |
| 8 - BATT | Backup battery input | Accepts 2.0V–5.5V battery or supercap; powers OUT and internal circuitry when VCC fails; leakage <1µA in backup mode. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | Guaranteed ±10% tolerance ensures robust brownout detection in noisy +5V systems without external resistive dividers. |
| 200ms reset timeout | Internally trimmed delay meets JEDEC-standard µP reset hold-time requirements without external RC components. |
| Independent power-fail comparator | 1.25V PFI threshold with 4mV hysteresis enables reliable low-voltage warning for auxiliary rails or battery health monitoring. |
| Battery freshness seal | Latched via PFO grounding sequence; disconnects BATT from internal circuitry until first power-up, preserving shelf life of backup cells. |
| Low 11µA quiescent current | Enables >10-year battery life in always-on portable instruments using CR2032 or similar coin cells. |
Applications
| Portable Data Loggers | Industrial HMI Panels |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity every 5 minutes with SRAM retention during mains outage. IC Role / Device Role / Timing Role: MAX817MESA monitors VCC, asserts RESET on brownout, and switches SRAM VDD to backup cell within 10µs of VCC collapse. Use Value: Prevents SRAM corruption during 100ms–2s grid interruptions; 11µA supply current extends CR2032 life to >7 years. |
Use Scenario: Touchscreen-based factory control panel powered from 5V SMPS, requiring guaranteed µP reset on input ripple or transient dropout. IC Role / Device Role / Timing Role: MAX817MESA provides deterministic 4.40V reset threshold and 200ms timeout, eliminating boot failures caused by marginal 5V rail stability. Use Value: Eliminates field returns due to hung µP states; PFI input monitors 3.3V I/O rail for early warning of regulator failure. |
| Medical Point-of-Care Devices | Smart Metering Modules |
Use Scenario: Handheld blood glucose meter storing calibration data in battery-backed SRAM between patient tests. IC Role / Device Role / Timing Role: MAX817MESA enables battery freshness seal to preserve primary coin cell until first use, then manages seamless VCC-to-BATT switchover during test cycles. Use Value: Ensures >5-year shelf life and >2000 test cycles per battery; 80Ω BATT-to-OUT switch limits inrush during switchover. |
Use Scenario: Electricity meter with real-time clock and tamper-detection SRAM, operating from 5V DC/DC converter fed by AC line. IC Role / Device Role / Timing Role: MAX817MESA monitors main 5V rail and uses PFI to detect AC loss via auxiliary winding signal, asserting RESET and enabling backup before capacitor discharge. Use Value: Guarantees RTC continuity and tamper log integrity during 200ms AC dropout; <1µA backup current extends supercap life to >15 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX817CSA | Same function and specs, but in 8-pin SO package (5.0mm × 4.0mm); 471mW max power dissipation vs. 330mW for µMAX. | Preferred for through-hole prototyping or legacy SO-based PCBs; less suitable for ultra-compact portable designs. | Select MAX817CSA if board layout accommodates SO-8 and thermal margin exceeds 471mW at +70°C ambient. |
| TPS3808G33DBVR | 3.3V reset threshold, 2% accuracy, 25µA IQ, no PFI/PFO; fixed 200ms timeout; SOT-23-6 package. | Designed for 3.3V µP systems only; lacks battery switchover and power-fail comparator - cannot replace MAX817MESA in +5V backup applications. | Choose TPS3808G33DBVR only for new 3.3V designs without backup requirements; not a functional substitute for MAX817MESA. |
Compared with MAX817CSA, MAX817MESA offers 30% smaller footprint and lower thermal resistance for space-constrained portable devices; compared with TPS3808G33DBVR, it supports +5V operation, battery backup, and dual-supply monitoring - making it irreplaceable in legacy 5V µP systems requiring data retention.
Availability
MAX817MESA is available at Aetrix Electronics and suitable for portable instrumentation, industrial HMI panels, medical point-of-care devices, and smart metering modules requiring stable component supply across long production lifecycles.
Supply support for MAX817MESA 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 management, sensing, and interface applications in industrial, computing, and portable markets.
The MAX817MESA belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic reset generation, low-power battery backup, and power-fail detection in +5V embedded systems - prioritizing reliability over feature bloat.
FAQ
What is the reset threshold voltage of the MAX817MESA?
The MAX817MESA has a factory-trimmed reset threshold of 4.40V with ±10% tolerance. This value is specified for VCC operating range +4.5V to +5.5V and ensures reliable reset assertion during brownout conditions in +5V systems. The threshold is internally generated and does not require external resistor networks.
Does the MAX817MESA include a watchdog timer?
No, the MAX817MESA does not include a watchdog timer. Watchdog functionality is exclusive to the MAX818 and MAX819 variants. Pin 6 (WDI) on the MAX817MESA is unconnected internally and must be left floating or tied to GND/VCC - driving it has no effect on device operation.
How does the battery freshness seal work on the MAX817MESA?
The MAX817MESA battery freshness seal is enabled by grounding PFO while cycling VCC above and below the 4.40V reset threshold. Once latched, it disconnects the BATT pin from internal circuitry until first power-up, preserving battery shelf life. The seal remains active until VCC rises above VRST, and its operation is unaffected by subsequent PFO state changes.
Can the MAX817MESA be used with a 3.3V microprocessor?
No, the MAX817MESA is designed exclusively for +5V systems. Its reset threshold (4.40V), operating voltage range (+4.5V to +5.5V), and internal comparator references are optimized for 5V rails. Using it with a 3.3V µP risks improper reset assertion and undefined behavior - select a 3.3V-specific supervisor like MAX6326 instead.
What is the maximum continuous current the OUT pin can source in battery-backup mode?
In battery-backup mode, the MAX817MESA OUT pin can continuously source up to 50mA from the BATT supply, as specified in Absolute Maximum Ratings. However, typical application current draw is <1µA when VCC < VBATT − 0.2V, and the BATT-to-OUT switch exhibits 80Ω on-resistance - limiting practical load to ≤10mA for <0.8V drop at room temperature.
MAX817MESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX817MESA FAQ
1.How can I place an order for MAX817MESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX817MESA 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 MAX817MESA reliable?
The price and inventory of MAX817MESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX817MESA is usually 5 days.
3.What payment methods are accepted for MAX817MESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX817MESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX817MESA?
MAX817MESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX817MESA 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 MAX817MESA?
For technical support, including MAX817MESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX817MESA requirements.
6.How does Aetrix verify that MAX817MESA is sourced from the original manufacturer or authorized distributors?
All MAX817MESA 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 MAX817MESA meets industry standards.
7.What is the process for return or replacement of MAX817MESA?
All MAX817MESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX817MESA, 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 MAX817MESA part is unused and in its original packaging.
Return procedure for MAX817MESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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