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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:2,906
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Product details
Overview
MAX817MESA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with active-low reset, battery switchover, and power-fail comparator functionality. It features a 4.40V reset threshold (±10%), 200ms reset timeout, 11µA quiescent current, and operates in 0°C to +70°C temperature range. Designed for portable µP systems requiring reliable brownout protection and RAM backup control.
For engineers reviewing the MAX817MESA+ datasheet, MAX817MESA+ pinout, MAX817MESA+ application, or MAX817MESA+ equivalent, this device serves as a low-power, precision voltage monitor and reset supervisor in battery-backed embedded controllers, intelligent instruments, and critical µP monitoring systems where supply stability and backup integrity are essential.
Technical Context
The MAX817MESA+ integrates a precision reset comparator with 4.40V threshold and 25mV hysteresis, a 200ms internal reset timer, and a dedicated power-fail comparator (PFI/PFO) with 1.25V threshold. Its battery switchover circuit uses dual PMOS switches (5Ω VCC-to-OUT, 80Ω BATT-to-OUT) to maintain CMOS RAM supply during VCC brownout when VBATT > VCC.
It supports backup-battery freshness sealing via PFO latching, ignores fast transients on VCC, and delivers guaranteed reset assertion for VCC < 4.40V - even with VBATT ≥ 1V. No watchdog or manual reset functions are present, 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; optimized for +5V systems with looser tolerance margin. |
| Reset Timeout Period | 200ms typical - ensures µP remains held in reset long enough for stable power recovery and clock stabilization. |
| Quiescent Supply Current | 11µA typical - enables multi-year operation in battery-powered applications without significant drain. |
| Battery Switchover Threshold | VCC < VBATT - automatically connects BATT to OUT only when VCC drops below battery voltage, preventing backfeed. |
| Power-Fail Comparator Threshold | 1.25V - provides independent undervoltage detection on PFI for auxiliary supply monitoring or low-battery warning. |
| Operating Temperature Range | 0°C to +70°C - validated for commercial-grade embedded systems and portable instrumentation. |
| VCC Operating Range | +4.5V to +5.5V - compatible with standard 5V regulated supplies including ±5% tolerance rails. |
Pinout & Package
MAX817MESA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with 8-pin SO and DIP variants. The µMAX package supports high-density PCB layouts and offers thermal performance suitable for portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Supply Output | Switched output connected to VCC (via 5Ω PMOS) during normal operation; switches to BATT (via 80Ω PMOS) when VCC < VRST and VCC < VBATT. |
| 2 - VCC | Main Supply Input | +4.5V to +5.5V primary power rail; powers internal circuitry and drives OUT when active. |
| 3 - GND | Ground Reference | 0V return path for all analog and digital functions; must be low-impedance for accurate reset threshold sensing. |
| 4 - PFI | Power-Fail Input | Analog input compared to 1.25V internal reference; asserts PFO low when VPFI < 1.25V for external supply monitoring. |
| 5 - PFO | Power-Fail Output | Open-drain active-low output reflecting PFI state; used for power-fail warning or battery freshness seal enable timing. |
| 6 - WDI | Watchdog Input | Not functional in MAX817 - unused pin; must be left open or tied to GND/VCC (no internal pull-up/down). |
| 7 - RESET | Active-Low Reset Output | Push-pull output asserted low for ≥200ms after VCC rises above 4.40V; holds µP in known state during power transitions. |
| 8 - BATT | Backup Battery Input | Accepts 2.0V–6.0V battery or supercapacitor; powers OUT and internal logic when VCC fails. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V Reset Threshold | Guaranteed ±10% accuracy over temperature ensures reliable brownout detection for +5V systems with wider supply tolerances. |
| 200ms Reset Timeout | Internally timed delay prevents premature µP release before power and clocks stabilize post-brownout. |
| 11µA Quiescent Current | Enables decade-scale battery life in always-on portable instruments using coin-cell or Li-SOCl₂ batteries. |
| Dual-Path Battery Switchover | 5Ω VCC-to-OUT and 80Ω BATT-to-OUT switches provide low-loss main supply and controlled backup transition without cross-conduction. |
| Independent Power-Fail Comparator | 1.25V PFI threshold allows monitoring of secondary rails (e.g., 3.3V, 2.5V) or battery voltage decay without affecting reset behavior. |
| Battery Freshness Seal Support | PFO-based latching disconnects BATT from internal circuitry until first power-up, preserving shelf life of backup cells. |
Applications
| Portable Data Loggers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Long-term field deployment with intermittent charging and infrequent data uploads. IC Role / Device Role / Timing Role: Supervises 5V system rail, asserts RESET during battery-switchover events, and monitors auxiliary sensor supply via PFI. Use Value: Prevents RAM corruption during VCC sag; extends usable battery life by limiting supply current to 11µA in standby. |
Use Scenario: Battery-powered ultrasound or ECG units requiring FDA-compliant power integrity and data retention. IC Role / Device Role / Timing Role: Provides deterministic 200ms reset hold time and seamless BATT-to-VCC switchover to preserve volatile configuration memory. Use Value: Ensures clinical data persistence across power cycles; eliminates need for external reset timers or discrete comparators. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted modules exposed to wide ambient temperatures and noisy 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Monitors local 5V regulation, filters fast transients on VCC, and gates RAM supply via OUT during undervoltage. Use Value: Rejects >100µs supply glitches without false resets; maintains real-time clock and calibration data through brownouts. |
Use Scenario: AMI meters with lithium backup batteries and tamper-detection circuitry requiring precise power sequencing. IC Role / Device Role / Timing Role: Enables battery freshness seal at factory programming, then monitors main supply via PFI for low-voltage alerts. Use Value: Guarantees >10-year backup battery shelf life; provides certified power-fail interrupt signaling to metrology ASIC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX817CSE+ | Same electrical specs and pinout; packaged in 8-pin SO instead of µMAX. Slightly larger footprint (5mm × 4mm vs. 3mm × 3mm). | Suitable for prototyping or legacy SO-based PCBs; lacks space-saving advantage of µMAX. | Select MAX817CSE+ if board layout accommodates SO package and thermal dissipation requirements are less stringent. |
| TPS3808G12DBVR | 4.25V reset threshold (±0.5%), 350ms timeout, 2.5µA IQ, but no PFI/PFO or battery switchover capability. | Limited to basic reset supervision; cannot replace MAX817MESA+ in battery-backed RAM applications. | Choose only for cost-sensitive, non-backup designs requiring ultra-low IQ and tighter reset accuracy. |
Compared with MAX817CSE+, MAX817MESA+ saves board area and improves thermal resistance; compared with TPS3808G12DBVR, it adds critical battery management and power-fail monitoring - making it irreplaceable in portable systems requiring data retention during power loss.
Availability
MAX817MESA+ is available at Aetrix Electronics and suitable for portable equipment, embedded controllers, and intelligent instruments requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX817 series belongs to Maxim's microprocessor supervisory product line, designed specifically to reduce component count and improve reliability in +5V µP systems requiring reset, battery backup, and power-fail monitoring - without integrated watchdog or manual reset.
FAQ
What is the reset threshold voltage of the MAX817MESA+?
The MAX817MESA+ has a nominal reset threshold of 4.40V with ±10% tolerance, specified for +4.5V to +5.5V VCC operation. This value is factory-trimmed and tested across temperature (0°C to +70°C); hysteresis is 25mV to prevent chatter near the trip point. The 'M' suffix explicitly denotes the 4.40V version, distinguishing it from the 4.65V 'L' variant.
Does the MAX817MESA+ include a watchdog timer function?
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 a no-connect terminal - it has no internal circuitry and must be left floating or tied to GND/VCC without affecting operation.
Can the MAX817MESA+ be used with a supercapacitor on the BATT pin?
Yes, the MAX817MESA+ supports supercapacitor backup sources on the BATT pin. Its switchover architecture accepts 2.0V–6.0V inputs, and the 80Ω BATT-to-OUT switch limits inrush current. For optimal performance, pair with a 0.1µF ceramic decoupling capacitor at BATT and ensure the supercap's leakage current remains below 1µA to preserve standby current spec.
How does the power-fail comparator (PFI/PFO) work in the MAX817MESA+?
The MAX817MESA+ PFI input compares against a 1.25V internal reference; when VPFI falls below this threshold, PFO pulls low. This comparator operates independently of the reset circuit and remains functional even during battery-backup mode. PFO can drive external logic or trigger interrupts, and its state is latched during reset timeout for battery freshness seal activation.
Is the MAX817MESA+ pin-compatible with other devices in the MAX817/MAX818/MAX819 family?
Yes, the MAX817MESA+ shares identical 8-pin µMAX pinout with all MAX817, MAX818, and MAX819 variants - including MAX817LESA+, MAX818MESA+, and MAX819LESA+. However, functional differences exist: MAX817 lacks WDI and MR pins, MAX818 adds CE gating, and MAX819 adds manual reset. Interchangeability requires verifying required features match the target application.
MAX817MESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- -
- 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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