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Analog Devices Inc./Maxim Integrated MAX815LESA+
- Part No.:
- MAX815LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:909
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Product details
Overview
MAX815LESA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory IC with integrated watchdog timer, power-fail monitoring, and manual reset functionality. It features a 4.7V ±1% reset threshold, 200ms reset timeout, active-low RESET output, and independent watchdog with 1.56s timeout-designed for reliable reset control in 5V embedded systems such as medical instruments and portable controllers.
For engineers reviewing the MAX815LESA+ datasheet, MAX815LESA+ pinout, MAX815LESA+ application, or MAX815LESA+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed package mapping (8-pin SO), and real-world use context for µP power monitoring, brownout recovery, and watchdog-based system recovery.
Technical Context
The MAX815LESA+ implements a dedicated reset generator with comparator-based VCC monitoring referenced to a precision 4.7V threshold, guaranteed valid down to VCC = 1V. Its watchdog circuit operates independently of the reset path, triggered by WDI transitions and timing out after 1.56s if no activity occurs.
Power-fail detection uses a separate 2.50V PFI comparator (K/L/N variants), with PFO asserting low when input falls below threshold. The device supports glitch-immune operation via internal hysteresis and transient rejection up to 30µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures deterministic reset assertion across temperature and supply variation in +5V systems. |
| Reset Timeout | 200ms minimum - guarantees sufficient hold time for µP initialization before release. |
| Watchdog Timeout | 1.56s - provides robust software execution monitoring without false triggers during normal operation. |
| Supply Current | 75µA max - enables battery-backed operation in portable equipment with multi-year runtime. |
| VCC Operating Range | 4.75V to 5.5V - matches standard +5V rail tolerances while maintaining full functionality. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and compatibility with diverse µP reset inputs. |
| Power-Fail Threshold | 2.50V on PFI - enables early warning of +5V supply degradation before reset threshold is crossed. |
Pinout & Package
MAX815LESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix). Pin 1 is MR (Manual Reset), Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is WDI, Pin 7 is RESET, and Pin 8 is WDO. All pins are CMOS-compatible with defined input thresholds and output drive capabilities per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low trigger with 150µA internal pull-up; initiates reset when pulled below 1.10V and holds reset for ≥200ms after release. |
| 2 - VCC | Positive Supply Input | Primary power source; reset asserted while VCC < 4.70V, guaranteed functional down to 1V. |
| 3 - GND | Ground Reference | Common return path for all internal comparators, outputs, and bias networks. |
| 4 - PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO low when input falls below 2.50V (±2%). |
| 5 - PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; used to interrupt µP before brownout-induced reset. |
| 6 - WDI | Watchdog Input | Edge-sensitive CMOS input; resets watchdog timer on each transition; timeout = 1.56s if idle. |
| 7 - RESET | Reset Output | Active-low open-drain output; held low for ≥200ms after VCC rises above 4.70V or MR release. |
| 8 - WDO | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or during VCC reset condition. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures consistent reset behavior across production lots and temperature ranges. |
| Independent watchdog with 1.56s timeout | Provides fail-safe software supervision without coupling to power-monitoring logic-critical for safety-critical firmware. |
| Guaranteed RESET validity to VCC = 1V | Enables reliable reset assertion during deep brownout, supporting graceful shutdown in battery-powered systems. |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive-prevents spurious resets in electrically noisy environments. |
| 75µA max supply current | Reduces quiescent load on backup rails, extending hold-up time in UPS and energy-harvesting applications. |
Applications
| Medical Instrumentation | Industrial Controller Monitoring |
|---|---|
|
Use Scenario: Portable ECG monitor operating from single Li-ion cell with buck-boost regulator supplying stable +5V. IC Role / Device Role / Timing Role: Supervisory IC monitors regulated +5V rail and asserts RESET during brownout; WDI fed by firmware heartbeat to detect lockup. Use Value: Prevents corrupted waveform storage and ensures deterministic restart after power interruption-meeting IEC 60601-1 reliability requirements. |
Use Scenario: PLC I/O module powered by isolated +5V DC/DC converter in factory automation cabinet. IC Role / Device Role / Timing Role: MAX815LESA+ watches VCC and feeds WDO to µP NMI pin; PFI monitors auxiliary 24V supply via resistor divider. Use Value: Enables dual-rail fault detection and immediate firmware intervention before control loop instability occurs. |
| Set-Top Box Power Management | Battery-Powered Data Logger |
|
Use Scenario: Consumer STB with standby +5VSB and main +5V rails; requires clean boot after AC dropout. IC Role / Device Role / Timing Role: RESET output controls enable line of main µP; PFO interrupts µP to save channel list before power loss. Use Value: Achieves zero-data-loss power-down within 100ms using early PFI warning-no capacitor hold-up required. |
Use Scenario: Remote environmental sensor node powered by coin cell; samples every 5 minutes and transmits via BLE. IC Role / Device Role / Timing Role: MAX815LESA+ supervises regulated +3.3V rail; MR tied to BLE module's reset signal for coordinated restart. Use Value: Reduces total system current to 75µA in sleep mode-enabling >5-year battery life with CR2032 cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | No watchdog circuit; includes LOW LINE output instead of WDI/WDO; same 4.7V reset threshold and SO-8 package. | Suitable where brownout warning (LOW LINE) is prioritized over software supervision. | Select MAX814LESA+ only if watchdog functionality is unnecessary and low-line detection is required. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms reset timeout; no watchdog; 2.5µA quiescent current; SOT-23-6 package. | Optimized for ultra-low-power 3.3V systems-not compatible for 5V reset or watchdog needs. | Choose TPS3808G33DBVR only for 3.3V-only designs requiring sub-µA standby current and minimal footprint. |
Compared with MAX815LESA+, MAX814LESA+ removes watchdog capability but adds low-line detection for pre-brownout alerts, while TPS3808G33DBVR trades voltage range and watchdog for extreme low-power operation in 3.3V space-constrained applications.
Availability
MAX815LESA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial controller monitoring, set-top box power management, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX815LESA+ 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-with emphasis on reliability, accuracy, and low-power operation.
The MAX814/MAX815/MAX816 family was engineered specifically for high-accuracy µP supervision in mission-critical embedded systems where deterministic reset timing, watchdog integrity, and power-fail predictability are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX815LESA+?
The MAX815LESA+ has a factory-trimmed reset threshold of 4.70V ±1%, specified over the full operating temperature range (0°C to +70°C). This value is fixed and corresponds to the "L" suffix in the part number. It ensures reliable reset assertion in +5V systems with ±5% supply tolerance, and remains stable across voltage, temperature, and time.
Does the MAX815LESA+ include a watchdog timer, and how is it configured?
Yes, the MAX815LESA+ integrates an independent watchdog timer with a fixed 1.56s timeout period. It is configured via the WDI (Watchdog Input) pin: each rising or falling edge resets the timer. If no transition occurs within 1.56s, WDO goes low. No external components or configuration registers are required-the function is fully hardware-based and self-contained within the MAX815LESA+.
Can the MAX815LESA+ monitor voltages other than VCC?
Yes-the MAX815LESA+ can monitor auxiliary supplies using its PFI (Power-Fail Input) pin. By connecting a resistor divider from the target voltage to PFI, the device compares the divided voltage against its internal 2.50V reference. For example, a +12V rail can be monitored by scaling it to 2.50V at PFI; when the scaled voltage drops, PFO asserts to signal impending failure-enabling preemptive action before VCC reset occurs.
What is the purpose of the WDO pin on the MAX815LESA+?
The WDO (Watchdog Output) pin on the MAX815LESA+ is an active-low open-drain output that goes low either when the watchdog timer times out (due to missing WDI transitions) or when the VCC reset condition is active. It is commonly connected to a µP's NMI (non-maskable interrupt) input to trigger immediate firmware response-or tied to MR to generate a full system reset upon watchdog timeout, ensuring recovery from software hangs.
Is the MAX815LESA+ pin-compatible with other devices in the MAX814/MAX815/MAX816 family?
Yes, the MAX815LESA+ shares identical pinout and SO-8 package with MAX814LESA+ and MAX816LESA+. However, functional differences exist: MAX814LESA+ lacks WDI/WDO but adds LOW LINE; MAX816LESA+ replaces VCC-based reset with adjustable RESET IN threshold. Direct substitution is possible only if the target application does not rely on the absent or differing features-electrical compatibility alone does not guarantee functional equivalence.
MAX815LESA+ 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.7V
- Output:
- Push-Pull, Totem Pole
- 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
MAX815LESA+ FAQ
1.How can I place an order for MAX815LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815LESA+ 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 MAX815LESA+ reliable?
The price and inventory of MAX815LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815LESA+ is usually 5 days.
3.What payment methods are accepted for MAX815LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815LESA+?
MAX815LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815LESA+ 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 MAX815LESA+?
For technical support, including MAX815LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815LESA+ requirements.
6.How does Aetrix verify that MAX815LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX815LESA+ 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 MAX815LESA+ meets industry standards.
7.What is the process for return or replacement of MAX815LESA+?
All MAX815LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX815LESA+, 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 MAX815LESA+ part is unused and in its original packaging.
Return procedure for MAX815LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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