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Analog Devices Inc./Maxim Integrated MAX815TCPA+
- Part No.:
- MAX815TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX815TCPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,152
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Product details
Overview
MAX815TCPA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitoring, and manual reset functionality. It features a 3.03V ±1% reset threshold, 1.56s watchdog timeout, active-low RESET output, 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 fail-safe restart.
For engineers reviewing the MAX815TCPA+ datasheet, MAX815TCPA+ pinout, MAX815TCPA+ application, or MAX815TCPA+ equivalent, key selection criteria include its fixed 3.03V reset threshold (T-suffix), independent watchdog with no external components, PFI/PFO undervoltage warning capability, and operation across 3.06V–5.5V supply range with glitch immunity.
Technical Context
The MAX815TCPA+ implements a dedicated watchdog timer with 1.56s timeout triggered by WDI transitions - not voltage monitoring - enabling robust software execution supervision. Its reset generator uses a precision bandgap reference and comparator with ±1% worst-case threshold accuracy over temperature and supply variation.
Power-fail detection is performed via a separate 1.70V PFI comparator (T-suffix and MAX816), independent of VCC monitoring, allowing early warning for +3.3V rails or other monitored voltages using external dividers. The RESET output remains valid and actively driven down to VCC = 1V, ensuring deterministic behavior during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely triggers reset at 3.03V falling edge; supports 3.3V systems with ±0.26V tolerance. |
| Watchdog Timeout | 1.56 seconds - provides sufficient margin for firmware recovery without false timeouts during normal operation. |
| Supply Current | 75µA max - enables multi-year battery life in portable equipment without compromising supervision fidelity. |
| RESET Validity Range | VCC ≥ 1V - guarantees active drive on RESET pin down to 1V, eliminating floating states during slow power-down. |
| Power-Fail Threshold | 1.70V on PFI - allows configurable early-warning detection for 3.3V rails via external resistor divider. |
| Reset Pulse Width | 200ms minimum - ensures µP initialization completes before release, meeting typical boot ROM timing requirements. |
| Operating Voltage | 3.06V to 5.5V - supports dual-rail systems (e.g., +3.3V logic + +5V peripherals) without level-shifting. |
Pinout & Package
MAX815TCPA+ is housed in an 8-pin plastic DIP package (0°C to +70°C operating range), with lead-free finish indicated by the '+' suffix. Pin assignments are validated per Maxim's official pin configuration diagrams and electrical characteristics tables.
| 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. |
| 2 VCC | Positive Supply Input | Primary power rail input; reset assertion begins when VCC falls below 3.03V and persists until VCC ≥ 1V. |
| 3 GND | Ground Reference | System ground return for all internal comparators, timers, and outputs; must be low-impedance. |
| 4 PFI | Power-Fail Input | High-impedance analog input referenced to 1.70V; asserts PFO low when voltage drops below threshold. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; signals impending supply collapse to µP interrupt or shutdown logic. |
| 6 WDI | Watchdog Input | CMOS-level input detecting edges; timeout occurs if no transition exceeds 1.56s, forcing WDO low. |
| 7 RESET | Reset Output | Active-low push-pull output; guaranteed <0.4V at 3.2mA sink, remains asserted during brownout and manual reset. |
| 8 WDO | Watchdog Output | Active-low open-drain output; goes low on watchdog timeout or VCC reset condition; no minimum pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures system reset occurs within 30.0mV of 3.03V across -40°C to +85°C and supply variation. |
| Independent watchdog with 1.56s timeout | Monitors software liveness via WDI transitions only - immune to VCC noise and does not require clock or external RC. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during slow discharge; avoids need for external pulldown resistors in most designs. |
| Power-fail comparator with 1.70V threshold | Enables early warning for 3.3V supplies using simple resistor divider; decoupled from reset path for flexible fault handling. |
| 75µA max supply current | Reduces quiescent load on coin-cell or Li-ion backup sources; supports >5-year shelf life in always-on monitoring applications. |
Applications
| Medical Patient Monitor | Portable Data Logger |
|---|---|
Use Scenario: Battery-powered ECG monitor operating on single Li-ion cell with 3.3V LDO regulation. IC Role / Device Role / Timing Role: Supervises 3.3V rail, asserts RESET on brownout, and triggers watchdog if firmware hangs during signal processing. Use Value: Prevents corrupted waveform storage and ensures safe shutdown before battery voltage collapses below µP operational minimum. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds using intermittent wake-up. IC Role / Device Role / Timing Role: Provides power-on reset, monitors main 3.3V supply via PFI, and enforces firmware sanity check via WDI toggling. Use Value: Guarantees clean boot after cold start and detects infinite loops in sleep/wake cycle - critical for unattended field deployment. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller with isolated 3.3V logic powered from 24V DC bus. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail caused by aging DC/DC converter, asserts PFO to halt I/O updates before data corruption. Use Value: Enables graceful I/O freeze and status flagging instead of erratic digital output during marginal supply conditions. |
Use Scenario: Consumer STB with standby + active modes; requires reliable reset on AC power restoration and brownout. IC Role / Device Role / Timing Role: Generates 200ms RESET pulse on power-up and monitors 3.3V core rail; PFO alerts SoC to initiate fast save-to-flash before shutdown. Use Value: Eliminates boot failures after grid fluctuations and preserves channel lineup/settings across power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TCPA+ | No watchdog timer; includes LOW LINE output instead of WDI/WDO; same 3.03V reset threshold and PFI/PFO functions. | Suitable where early low-line warning is prioritized over software supervision (e.g., battery fuel gauging). | Select MAX814TCPA+ only if watchdog functionality is unnecessary and low-line detection is required. |
| TPS3808G30DBVR | 3.0V reset threshold (±0.5%), 35µA IQ, no watchdog, open-drain RESET, no PFI/PFO; SOT-23-6 package. | Better suited for space-constrained, ultra-low-IQ applications without power-fail warning or watchdog needs. | Choose TPS3808G30DBVR only for minimal footprint and lowest quiescent current - sacrifices PFI, WDI, and push-pull RESET. |
Compared with MAX815TCPA+, MAX814TCPA+ retains identical reset accuracy and power-fail capability but removes watchdog supervision, while TPS3808G30DBVR trades functional completeness for smaller size and lower IQ - neither offers the full tri-function (reset + watchdog + PFI) set of MAX815TCPA+ in DIP format.
Availability
MAX815TCPA+ is available at Aetrix Electronics and suitable for medical instrumentation, portable data loggers, industrial I/O modules, and consumer set-top boxes requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for MAX815TCPA+ 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, medical, and communications applications.
The MAX814/MAX815/MAX816 family was designed specifically for reliable µP supervision in battery-powered and safety-critical systems, emphasizing ±1% reset accuracy, ultra-low supply current, and integrated fault-detection functions without external components.
FAQ
What is the exact reset threshold voltage of the MAX815TCPA+?
The MAX815TCPA+ has a factory-trimmed reset threshold of 3.03V ±1% (i.e., 3.00V to 3.06V) over temperature and supply variation. This value is fixed by the 'T' suffix and applies to VCC monitoring - it is not adjustable. The threshold is guaranteed across the full 0°C to +70°C commercial temperature range and supports 3.3V systems with tight supply tolerances.
Does the MAX815TCPA+ include a watchdog timer, and how is it configured?
Yes, the MAX815TCPA+ integrates a dedicated watchdog timer with a fixed 1.56s timeout period. It is configured solely via the WDI pin: each rising or falling edge resets the timer, and failure to toggle WDI within 1.56s causes WDO to go low. No external capacitors or resistors are needed - the timer is fully self-contained and operates independently of VCC monitoring.
Can the MAX815TCPA+ monitor a voltage other than VCC, such as a 12V rail?
Yes, the MAX815TCPA+ can monitor voltages other than VCC using its PFI pin. For a 12V rail, connect a resistor divider to scale the voltage down to ≤1.70V at PFI. When the scaled voltage falls below 1.70V, PFO asserts low - this signal can trigger an interrupt or be connected to MR to force a reset. The PFI comparator is fully independent of the VCC reset path.
What is the function of the WDO pin on the MAX815TCPA+?
The WDO (Watchdog Output) pin on the MAX815TCPA+ is an active-low, open-drain output that goes low under two conditions: (1) when the watchdog timer times out due to lack of WDI transitions, or (2) when VCC falls below the 3.03V reset threshold. WDO has no minimum pulse width and responds immediately to VCC crossing - unlike RESET, which holds for 200ms.
Is the MAX815TCPA+ compatible with 5V systems, and what is its maximum operating voltage?
Yes, the MAX815TCPA+ operates from 3.06V to 5.5V, making it fully compatible with both 3.3V and 5V systems. Its absolute maximum VCC rating is +6.0V, and it maintains specified performance (including 3.03V reset accuracy and 75µA supply current) across the entire 3.06V–5.5V range - no derating or external components are required for 5V use.
MAX815TCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX815TCPA+ FAQ
1.How can I place an order for MAX815TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815TCPA+ 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 MAX815TCPA+ reliable?
The price and inventory of MAX815TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX815TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815TCPA+?
MAX815TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815TCPA+ 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 MAX815TCPA+?
For technical support, including MAX815TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815TCPA+ requirements.
6.How does Aetrix verify that MAX815TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX815TCPA+ 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 MAX815TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX815TCPA+?
All MAX815TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX815TCPA+, 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 MAX815TCPA+ part is unused and in its original packaging.
Return procedure for MAX815TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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