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Analog Devices Inc./Maxim Integrated MAX815TESA+T
- Part No.:
- MAX815TESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815TESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,147
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Product details
Overview
MAX815TESA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitoring, and manual reset functionality. It features a 3.03V fixed reset threshold, 200ms reset timeout, active-low RESET output, and guaranteed operation down to VCC = 1V. Designed for battery-powered portable equipment and critical µP power monitoring in +3.3V systems.
For engineers reviewing the MAX815TESA+T datasheet, MAX815TESA+T pinout, MAX815TESA+T application, or MAX815TESA+T equivalent, this device delivers verified reset accuracy, glitch-immune power supervision, and deterministic watchdog timeout - key selection criteria for medical instruments, intelligent controllers, and set-top boxes requiring reliable brownout recovery and early power-fail warning.
Technical Context
The MAX815TESA+T implements a dedicated watchdog timer with 1.56s timeout (±20%) triggered by WDI transitions, independent of VCC monitoring. Its reset comparator ignores transients ≤30µs at 100mV overdrive and guarantees valid RESET output down to VCC = 1V with <0.4V VOL at 50µA sink.
Power-fail detection uses a 1.70V internal reference on PFI (matching the T-suffix 3.03V reset threshold), enabling coordinated early-warning signaling via PFO. The manual reset input (MR) includes a 150µA internal pullup and supports TTL/CMOS logic levels without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely matches +3.3V supply systems with ±0.26V tolerance, ensuring reset assertion before µP operational failure. |
| Supply Current | 75µA max - enables multi-year battery life in portable medical devices and handheld instrumentation. |
| Reset Pulse Width | 200ms min - provides sufficient hold time for full µP initialization and peripheral stabilization after power-up or brownout. |
| Watchdog Timeout | 1.56s ±20% - balances software execution margin against timely fault recovery in embedded control loops. |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion during deep brownout and compatibility with mixed-voltage systems. |
| Power-Fail Reference | 1.70V - enables scalable early-warning thresholds via external voltage divider on PFI for +3.3V or +5V rails. |
| Glitch Immunity | Rejects ≤30µs negative transients at 100mV overdrive - prevents spurious resets in noisy industrial environments. |
Pinout & Package
MAX815TESA+T is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (+T suffix). Pin 1 is marked with a dot; pin numbering follows counterclockwise order from top-left when viewed from top with marking dot upper-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pullup; triggers 200ms reset pulse when pulled below 1.1V - eliminates need for external pullup in switch-based reset designs. |
| 2 VCC | Positive Supply Input | Primary power rail input; RESET remains asserted until VCC rises above 3.03V and holds for 200ms - ensures µP starts only after stable supply. |
| 3 GND | Ground Reference | Common return path for all internal comparators and outputs; must be low-impedance to maintain reset threshold accuracy. |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 1.70V; used with external resistor divider to detect falling supply voltages before reset threshold breach. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 1.70V - directly interfaces with µP NMI or interrupt pins for orderly shutdown initiation. |
| 6 WDI | Watchdog Input | CMOS-level input monitoring µP activity; timeout occurs if no transition within 1.56s - detects software hangs independent of VCC stability. |
| 7 RESET | Reset Output | Active-low open-drain output sinking ≥3.2mA at 0.4V - drives µP reset pin directly; guaranteed valid down to VCC = 1V. |
| 8 WDO | Watchdog Output | Active-low open-drain output sourcing ≥300µA when high; goes low on watchdog timeout or VCC reset condition - enables watchdog-triggered reset when wired to MR. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset timing across temperature (-40°C to +85°C) and supply variations. |
| Independent watchdog with 1.56s timeout | Provides fail-safe recovery for software lockups without relying on VCC monitoring - critical for autonomous controllers. |
| Guaranteed RESET validity to VCC = 1V | Enables robust brownout handling in battery-powered systems where supply collapses gradually below µP operating range. |
| Power-supply glitch immunity | Rejects fast transients (≤30µs at 100mV overdrive) to prevent false resets in electrically noisy environments like motor drives or switching PSUs. |
| 1.70V PFI reference matched to 3.03V reset threshold | Allows single-resistor-divider design for coordinated early-warning (PFO) and hard reset (RESET) on +3.3V rails. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
|
Use Scenario: Portable ECG monitor operating from single Li-ion cell with dynamic load causing voltage sag during signal acquisition. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET when VCC drops below 3.03V and generating PFO interrupt 100ms earlier via PFI divider to trigger data save before brownout. Use Value: Prevents corrupted waveform storage and ensures deterministic restart after battery recharge, meeting IEC 60601-1 reliability requirements. |
Use Scenario: Handheld barcode scanner using intermittent high-current laser pulses causing 200ms VCC droop. IC Role / Device Role / Timing Role: MAX815TESA+T monitors VCC and asserts 200ms RESET pulse on each droop event while maintaining watchdog supervision of firmware execution. Use Value: Guarantees µP reset duration exceeds worst-case processor boot time, eliminating boot failures during field use. |
| Intelligent Instruments | Set-Top Boxes |
|
Use Scenario: Industrial multimeter with real-time FFT processing and nonvolatile memory write cycles vulnerable to power interruption. IC Role / Device Role / Timing Role: Uses PFO interrupt to halt computation and initiate EEPROM write-protection sequence when PFI detects 5% supply decline, then asserts RESET at full 3.03V threshold. Use Value: Ensures measurement integrity and flash memory consistency during AC line sags common in factory environments. |
Use Scenario: Cable STB with dual-rail +3.3V/+12V supplies where +12V sag precedes +3.3V collapse during grid instability. IC Role / Device Role / Timing Role: Configured with PFI divider to monitor +12V rail; PFO triggers µP interrupt to flush buffers and disable tuners 150ms before +3.3V reset threshold breach. Use Value: Enables graceful channel retention and state preservation during brownouts, reducing customer support calls for "lost settings". |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TESA+T | Lacks watchdog timer; provides LOW LINE output instead of WDO/WDI; identical 3.03V reset threshold and PFI/PFO functions. | Suitable for simpler systems needing only power-on reset and early warning, without software hang detection. | Select MAX814TESA+T when watchdog functionality is unnecessary and low-line interrupt capability is preferred over watchdog signaling. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms delay, but no integrated watchdog; higher 12µA quiescent current; requires external capacitor for delay setting. | Better suited for cost-sensitive consumer electronics where watchdog is omitted and tighter supply current spec is not required. | Choose TPS3808G33DBVR only if board space allows external timing capacitor and system architecture excludes watchdog requirements. |
Compared with MAX814TESA+T and TPS3808G33DBVR, the MAX815TESA+T uniquely integrates a deterministic 1.56s watchdog timer with independent WDI/WDO signaling - enabling software fault recovery unattainable with reset-only alternatives, while maintaining identical power-fail and manual-reset capabilities.
Availability
MAX815TESA+T is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, intelligent instruments, and set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX815TESA+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 high accuracy, low power, and reliability.
The MAX814/MAX815/MAX816 family targets microprocessor supervision in safety-critical and portable systems, delivering ±1% reset accuracy, ultra-low supply current, and integrated watchdog/power-fail functions without external components.
FAQ
What is the exact reset threshold voltage of the MAX815TESA+T and how is it specified?
The MAX815TESA+T has a factory-trimmed reset threshold of 3.03V with ±1% worst-case accuracy over -40°C to +85°C. This value is fixed and corresponds to the "T" suffix in the part number, optimized for +3.3V supply systems with tight tolerance requirements. The threshold is guaranteed across voltage, temperature, and process variations per Maxim's Electrical Characteristics table for +3V parts.
Does the MAX815TESA+T provide both power-on reset and watchdog functionality in a single package?
Yes, the MAX815TESA+T integrates both functions: a precision reset generator with 200ms timeout and an independent watchdog timer with 1.56s timeout. The WDI input monitors µP activity, and WDO asserts low on timeout or during VCC reset - enabling dual-layer system supervision without external components.
How does the MAX815TESA+T handle power supply transients, and what is its glitch immunity specification?
The MAX815TESA+T rejects negative-going VCC transients ≤30µs in duration when the overdrive is 100mV below the 3.03V reset threshold, as confirmed in the Typical Operating Characteristics graph (MAX814-13). This immunity prevents false resets in electrically noisy environments such as motor-driven or switching-power applications.
Can the MAX815TESA+T monitor supply voltages other than VCC, and how is that implemented?
Yes, the MAX815TESA+T can monitor auxiliary rails via the PFI pin. Using a resistor divider, any voltage (e.g., +12V or negative rail) is scaled to match the 1.70V internal PFI reference. When the divided voltage falls below 1.70V, PFO asserts low - enabling early-warning interrupts for multiple supply domains without additional ICs.
What is the minimum VCC voltage at which the MAX815TESA+T guarantees valid RESET output behavior?
The MAX815TESA+T guarantees RESET output remains a valid logic low (<0.4V at 50µA sink) down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, RESET becomes high-impedance - requiring an external pulldown resistor if deterministic low state is needed during deep brownout.
MAX815TESA+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:
- 3.03V
- 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
MAX815TESA+T FAQ
1.How can I place an order for MAX815TESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815TESA+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 MAX815TESA+T reliable?
The price and inventory of MAX815TESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815TESA+T is usually 5 days.
3.What payment methods are accepted for MAX815TESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815TESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815TESA+T?
MAX815TESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815TESA+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 MAX815TESA+T?
For technical support, including MAX815TESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815TESA+T requirements.
6.How does Aetrix verify that MAX815TESA+T is sourced from the original manufacturer or authorized distributors?
All MAX815TESA+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 MAX815TESA+T meets industry standards.
7.What is the process for return or replacement of MAX815TESA+T?
All MAX815TESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX815TESA+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 MAX815TESA+T part is unused and in its original packaging.
Return procedure for MAX815TESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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