My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX815LESA+T
- Part No.:
- MAX815LESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815LESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX815LESA+T from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory IC with integrated watchdog timer, power-fail monitoring, and active-low reset output. It features ±1% worst-case reset threshold accuracy (4.70V), 200ms reset timeout, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable medical instruments and battery-powered controllers requiring reliable brownout detection and autonomous system recovery.
For engineers reviewing the MAX815LESA+T datasheet, MAX815LESA+T pinout, MAX815LESA+T application, or MAX815LESA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior (1.56s watchdog timeout, 200ms reset pulse), real-world power-fail comparator thresholds (2.50V PFI), and validated alternative options for +5V µP supervision with watchdog capability.
Technical Context
The MAX815LESA+T implements a dedicated watchdog timer with 1.56s timeout independent of the reset comparator, triggered by transitions on WDI. Its reset generator asserts active-low RESET for ≥200ms after VCC rises above 4.70V or after MR release, with immunity to transients ≤30µs at 100mV overdrive.
It integrates a separate power-fail comparator comparing PFI to a fixed 2.50V internal reference (K/L/N suffix), driving open-drain PFO low when PFI falls below threshold. The LOW LINE output is absent-only MAX814 includes it-and RESET IN functionality is exclusive to MAX816.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reliable reset assertion for 5V systems with ±5% supply tolerance |
| Watchdog Timeout | 1.56 seconds - provides sufficient margin to detect firmware hangs without false triggers |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment |
| PFI Threshold | 2.50V - allows early warning of +5V rail collapse using external resistive divider |
| VCC Operating Range | 4.75V to 5.5V - supports full industrial 5V supply envelope with margin |
| RESET Output Type | Active-low open-drain - compatible with standard µP reset inputs and pull-up configurations |
Pinout & Package
MAX815LESA+T is housed in an 8-pin SO (Small Outline) package, lead-free, with gull-wing leads and standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.27mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input with 150µA internal pullup; triggers reset when pulled <1.10V; accepts CMOS/TTL logic or switch-to-GND |
| 2 | VCC | +5V supply input; device operates from 4.75V–5.5V; RESET valid down to VCC = 1V |
| 3 | GND | Ground reference for all internal comparators and outputs |
| 4 | PFI | Power-fail input; compared to 2.50V internal reference; drives PFO low when voltage falls below threshold |
| 5 | PFO | Open-drain power-fail output; sinks ≥1.2mA when PFI < 2.50V; used for µP interrupt or reset initiation |
| 6 | WDI | Watchdog input; edge-sensitive; timer resets on each transition; timeout occurs if static >1.56s |
| 7 | RESET | Active-low open-drain reset output; asserted low during power-up, brownout, or MR activation; min 200ms pulse |
| 8 | WDO | Watchdog output; active-low open-drain; goes low on watchdog timeout or VCC < reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset across temperature, voltage, and process variation |
| Independent watchdog with 1.56s timeout | Enables robust firmware supervision without coupling to power-rail behavior or reset timing |
| 75µA max supply current | Supports ultra-low-power operation in always-on portable and remote sensor applications |
| Guaranteed RESET validity to VCC = 1V | Ensures clean, predictable reset deassertion during deep brownout-critical for nonvolatile memory write completion |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive, preventing spurious resets in noisy environments |
Applications
| Medical Patient Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Continuous ECG acquisition with flash-based data storage during intermittent charging cycles. IC Role / Device Role / Timing Role: Supervises +5V main rail and triggers controlled shutdown via PFO interrupt when battery voltage drops below safe write threshold. Use Value: Prevents flash corruption by ensuring µP completes critical save routines before VCC collapses below 4.70V. |
Use Scenario: Remote environmental sensor node powered by Li-SOCl₂ cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Provides brownout reset and watchdog supervision while drawing only 75µA-extending operational life by >18 months vs. typical 100µA supervisors. Use Value: Enables reliable field deployment without service access, leveraging guaranteed RESET down to 1V for final data flush. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller with isolated 5V logic rail subject to 12V bus transients. IC Role / Device Role / Timing Role: Monitors 5V rail with 4.70V reset threshold and detects firmware lockups via WDI toggling; WDO tied to MR for automatic recovery. Use Value: Eliminates need for external reset controller or software polling-reducing BOM count and improving MTBF. |
Use Scenario: Consumer STB with dual-rail power (5V/3.3V) and requirement for graceful HDMI hot-plug response. IC Role / Device Role / Timing Role: Uses PFI to monitor 5V standby rail; asserts PFO interrupt to initiate firmware-controlled power sequencing before main rail collapse. Use Value: Meets CEC compliance requirements for zero-power state entry by enabling deterministic pre-shutdown signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+T | No watchdog circuit; includes LOW LINE output instead of WDI/WDO; same 4.70V reset threshold and PFI/PFO functions | Suitable where early low-line warning (NMI) is prioritized over firmware hang detection | Select when system requires power-rail degradation alert before reset, not autonomous watchdog recovery |
| TPS3808G18DBVR | Fixed 1.8V reset threshold; no PFI/PFO; no watchdog; 360ms reset delay; 2.5µA quiescent current | Designed for low-voltage µPs (1.8V core); lacks power-fail monitoring and watchdog-requires external circuitry for those functions | Choose only for 1.8V systems needing ultra-low IQ; not functionally substitutable for 5V watchdog/PFI use cases |
Compared with MAX814LESA+T, MAX815LESA+T adds autonomous watchdog supervision at identical accuracy and power; versus TPS3808G18DBVR, it delivers full +5V supervision with PFI/PFO and watchdog-but consumes higher current and targets different voltage domains.
Availability
MAX815LESA+T is available at Aetrix Electronics and suitable for medical instrumentation, portable data loggers, industrial PLC modules, and consumer set-top boxes requiring stable component supply across extended product lifecycles.
Supply support for MAX815LESA+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, emphasizing reliability, accuracy, and low power.
The MAX814/MAX815/MAX816 family was engineered specifically for high-reliability microprocessor supervision in portable and critical systems-delivering ±1% reset accuracy, sub-100µA operation, and integrated watchdog/power-fail functions in compact SO/DIP packages.
FAQ
What is the reset threshold voltage of the MAX815LESA+T?
The MAX815LESA+T has a factory-set reset threshold of 4.70V ±1%, optimized for +5V systems with ±5% supply tolerance. This value is fixed by the 'L' suffix and confirmed in the Electrical Characteristics table for VCC = 4.75V to 5.5V. The threshold remains stable across temperature (−40°C to +85°C) and load, ensuring deterministic reset behavior in critical applications.
Does the MAX815LESA+T include a watchdog timer?
Yes, the MAX815LESA+T integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. It monitors transitions on the WDI pin and asserts WDO low upon timeout. Unlike the reset function, the watchdog operates independently of VCC level-WDO goes low immediately when VCC falls below the reset threshold or when the watchdog times out.
Can the MAX815LESA+T monitor voltages other than VCC?
Yes-the MAX815LESA+T can monitor auxiliary rails using the PFI pin. By connecting a resistive divider from the target voltage (e.g., +12V) to PFI, the internal 2.50V comparator triggers PFO when the divided voltage falls below threshold. This enables early-warning detection for any DC rail, provided the divider ratio scales the monitored voltage into the 2.50V detection window.
What is the function of the WDO pin on the MAX815LESA+T?
The WDO (Watchdog Output) pin on the MAX815LESA+T is an active-low open-drain output that goes low during watchdog timeout or when VCC drops below the 4.70V reset threshold. It has no minimum pulse width and transitions immediately-unlike RESET-which makes it suitable for NMI interrupts or cascading to MR for automatic system recovery without additional logic.
Is the MAX815LESA+T pin-compatible with other devices in the MAX814/MAX815/MAX816 family?
Yes, the MAX815LESA+T shares the identical 8-pin SO package and pinout with MAX814LESA+T and MAX816LESA+T. Pin functions differ only where noted: MAX814 uses Pin 6 as LOW LINE, MAX815 uses it as WDI, and MAX816 uses Pin 6 as RESET IN. All share identical VCC, GND, PFI, PFO, MR, RESET, and package dimensions-enabling layout reuse with minor schematic updates.
MAX815LESA+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:
- 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+T FAQ
1.How can I place an order for MAX815LESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815LESA+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 MAX815LESA+T reliable?
The price and inventory of MAX815LESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815LESA+T is usually 5 days.
3.What payment methods are accepted for MAX815LESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815LESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815LESA+T?
MAX815LESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815LESA+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 MAX815LESA+T?
For technical support, including MAX815LESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815LESA+T requirements.
6.How does Aetrix verify that MAX815LESA+T is sourced from the original manufacturer or authorized distributors?
All MAX815LESA+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 MAX815LESA+T meets industry standards.
7.What is the process for return or replacement of MAX815LESA+T?
All MAX815LESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX815LESA+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 MAX815LESA+T part is unused and in its original packaging.
Return procedure for MAX815LESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX815LESA+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
