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Analog Devices Inc./Maxim Integrated MAX817LESA+
- Part No.:
- MAX817LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX817LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
The MAX817LESA+ from Maxim Integrated is a +5V microprocessor supervisory circuit designed for precision supply monitoring, battery backup switchover, and active-low reset generation in embedded µP systems. It features a 4.65V ±5% reset threshold, 200ms reset timeout, 11µA quiescent current, and operates in the 0°C to +70°C range. It is used in portable equipment requiring reliable brownout protection and RAM backup during power failure.
For engineers reviewing the MAX817LESA+ datasheet, MAX817LESA+ pinout, MAX817LESA+ application, or MAX817LESA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing and threshold behavior, battery switchover hysteresis, and validated alternatives for µP supervisory replacement in space-constrained +5V designs.
Technical Context
The MAX817LESA+ integrates a precision voltage comparator with 4.65V reset threshold, internal 200ms reset timer, and bidirectional battery switchover logic that activates when VCC falls below both VRST (4.65V) and VBATT. Its reset output asserts low during power-up, brownout, or manual trigger (not applicable here), and remains valid down to VCC = 1V with VBATT > 1V.
It includes a power-fail comparator (PFI/PFO) with 1.25V threshold and 4mV hysteresis, and supports battery freshness seal activation via PFO grounding. Unlike MAX818/MAX819, it lacks watchdog input and chip-enable gating - confirming its role as a minimal-feature supervisory IC focused on reset and backup control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±5% - triggers reset when VCC drops below this level; optimized for stable +5V system monitoring. |
| Reset Timeout Period | 200ms typical - guarantees µP remains held in reset long enough for stable power recovery. |
| Supply Current | 11µA typical - enables multi-year operation in battery-backed portable instruments. |
| Battery Switchover Threshold | VCC < VBATT - switches OUT from VCC to BATT only when backup voltage exceeds supply. |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade embedded controllers and industrial peripherals. |
| Package | 8-pin SO (SOIC) - surface-mount compatible with standard PCB assembly and thermal profiles. |
| Power-Fail Comparator | 1.25V threshold at PFI - provides independent undervoltage warning for secondary rails or battery monitoring. |
Pinout & Package
MAX817LESA+ is housed in an 8-pin SO (SOIC) package, measuring 4.9mm × 3.9mm × 1.75mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switches between VCC and BATT to maintain CMOS RAM power during brownout; connects to VCC via 5Ω PMOS when active. |
| 2 VCC | Main Supply Input | +5V system rail input; powers internal circuitry and enables reset assertion when falling below 4.65V. |
| 3 GND | Ground Reference | 0V reference for all analog comparators, reset logic, and battery switchover control. |
| 4 PFI | Power-Fail Input | Analog input for external undervoltage detection; compared to 1.25V internal reference to drive PFO. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25V or VCC < VBATT; used for battery freshness seal enable. |
| 6 WDI | Watchdog Input | Not functional in MAX817 - unused pin; must be left open or tied to GND per datasheet guidance. |
| 7 RESET | Active-Low Reset Output | Drives µP reset pin low for ≥200ms after VCC rise above 4.65V or during brownout; sinks 3.2mA min. |
| 8 BATT | Battery Backup Input | Accepts 2.0V–5.5V backup source; powers OUT and internal logic when VCC fails; leakage < 1µA in backup mode. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V reset threshold | ±5% tolerance ensures reliable reset across temperature and supply variation in +5V systems. |
| 200ms reset timeout | Guaranteed minimum delay prevents premature µP release before power stabilization. |
| 11µA quiescent current | Enables >10-year shelf life in battery-backed memory retention applications. |
| Battery switchover with hysteresis | 20mV hysteresis prevents oscillation during VCC/VBATT crossover near switchover point. |
| Power-fail comparator (1.25V) | Independent analog monitor allows dual-rail fault detection without µP intervention. |
Applications
| Portable Data Loggers | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered field sensor nodes logging temperature/pressure over weeks without mains power. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset and seamless RAM backup switchover when primary supply dips. Use Value: Prevents data corruption during intermittent solar/battery charging cycles by holding µP in reset until VCC stabilizes above 4.65V. |
Use Scenario: DIN-rail mounted I/O expansion modules interfacing with 24V DC field buses and local +5V logic. IC Role / Device Role / Timing Role: Voltage monitor asserting reset if 5V regulator fails, while enabling backup SRAM retention via BATT. Use Value: Maintains configuration and last-state registers during brief 24V bus interruptions, avoiding reinitialization delays. |
| Medical Handheld Diagnostics | Smart Energy Meters |
|
Use Scenario: FDA-cleared handheld analyzers using disposable alkaline batteries and nonvolatile memory. IC Role / Device Role / Timing Role: Ensures deterministic boot sequence and preserves calibration data during battery replacement. Use Value: Battery freshness seal function isolates backup cell until first power-on, extending shelf life beyond 5 years. |
Use Scenario: ANSI C12.20-compliant meters with tamper-proof EEPROM storing tariff schedules and consumption history. IC Role / Device Role / Timing Role: Provides dual-voltage supervision: main 5V rail and auxiliary 3.3V RTC supply via PFI divider network. Use Value: PFO-driven power-fail interrupt alerts µP to save critical metering data before backup capacitor depletes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690ACPA+ | 4.65V reset threshold, 200ms timeout, but higher 35µA supply current and no battery switchover. | Lacks BATT pin and backup switching - suitable only where RAM retention is handled externally. | Select when cost sensitivity outweighs battery backup need and SOIC footprint is not required. |
| TPS3808G18DBVR | 4.63V threshold, 200ms timeout, 1.6µA supply current, but requires external pull-up on RESET and no PFI/PFO. | No power-fail comparator or battery interface - limited to basic reset-only use cases. | Choose for ultra-low-power applications where PFI monitoring and RAM backup are unnecessary. |
Compared with MAX690ACPA+ and TPS3808G18DBVR, the MAX817LESA+ uniquely combines 4.65V precision reset, integrated battery switchover, and PFI/PFO monitoring in a single SOIC-8 package - making it the only option among the three that supports full RAM backup and dual-rail fault detection in compact +5V systems.
Availability
MAX817LESA+ is available at Aetrix Electronics and suitable for portable equipment, industrial controllers, and medical diagnostics requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.
Supply support for MAX817LESA+ 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, communications, and computing markets.
The MAX817L/M series belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust, low-power reset and battery backup control in +5V µP systems with stringent reliability requirements.
FAQ
What is the exact reset threshold voltage of the MAX817LESA+?
The MAX817LESA+ has a factory-trimmed reset threshold of 4.65V with ±5% tolerance. This value is specified over the full operating temperature range (0°C to +70°C) and remains stable under typical load conditions. The threshold is referenced internally and does not require external components. It is confirmed in the Electrical Characteristics table on page 3 of the official MAX817 datasheet, with typical hysteresis of 25mV.
Does the MAX817LESA+ support watchdog timer functionality?
No, the MAX817LESA+ does not include watchdog timer functionality. The WDI pin (Pin 6) is present but unused - the device is part of the MAX817 variant family, which omits watchdog circuitry per the Selector Guide. Only MAX817/MAX818/MAX819 variants with "W" suffix or explicit "watchdog" in ordering code implement this feature. For watchdog capability, consider MAX818LESA+ instead.
Can the MAX817LESA+ switch to battery backup when VCC is still above 4.65V?
No. The MAX817LESA+ initiates battery switchover only when two conditions are met simultaneously: VCC falls below the reset threshold (4.65V) AND VCC falls below VBATT. If VCC remains above 4.65V but drops below VBATT (e.g., VCC = 4.7V, VBATT = 4.8V), the device stays on VCC and does not engage BATT. This dual-condition logic prevents premature battery discharge during marginal supply conditions.
What is the purpose of the PFI and PFO pins on the MAX817LESA+?
The PFI (Pin 4) and PFO (Pin 5) form an independent power-fail comparator: PFI accepts an external voltage divider signal, which is compared to a precise 1.25V internal reference. When PFI falls below 1.25V, PFO pulls low. This allows monitoring of secondary supplies (e.g., 3.3V rails) or battery voltage decay. In the MAX817LESA+, PFO also enables the battery freshness seal when grounded during power-up sequencing.
Is the MAX817LESA+ pin-compatible with other MAX81x variants in SO package?
Yes, the MAX817LESA+, MAX818LESA+, and MAX819LESA+ share identical 8-pin SO (SOIC) pinouts and footprints. However, functional pin behavior differs: WDI (Pin 6) is unused in MAX817LESA+, active in MAX818LESA+, and MR (Pin 6 on MAX819) replaces WDI entirely. CE IN/OUT pins are absent in MAX817LESA+. Thus, while physically interchangeable, electrical compatibility requires verification of signal mapping per variant.
MAX817LESA+ 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:
- 4.65V
- 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
MAX817LESA+ FAQ
1.How can I place an order for MAX817LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX817LESA+ 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 MAX817LESA+ reliable?
The price and inventory of MAX817LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX817LESA+ is usually 5 days.
3.What payment methods are accepted for MAX817LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX817LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX817LESA+?
MAX817LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX817LESA+ 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 MAX817LESA+?
For technical support, including MAX817LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX817LESA+ requirements.
6.How does Aetrix verify that MAX817LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX817LESA+ 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 MAX817LESA+ meets industry standards.
7.What is the process for return or replacement of MAX817LESA+?
All MAX817LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX817LESA+, 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 MAX817LESA+ part is unused and in its original packaging.
Return procedure for MAX817LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX817LESA+ Tags
-
MIC826SYMT-TR
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APX803L20-29SA-7
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