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Analog Devices Inc./Maxim Integrated MAX815LCPA+
- Part No.:
- MAX815LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX815LCPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
MAX815LCPA+ 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 4.70V ±1% reset threshold, 200ms reset pulse width, 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 system recovery.
For engineers reviewing the MAX815LCPA+ datasheet, MAX815LCPA+ pinout, MAX815LCPA+ application, or MAX815LCPA+ equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing behavior (1.56s watchdog timeout, 200ms reset delay), and real-world substitution guidance for +5V µP supervision systems.
Technical Context
The MAX815LCPA+ implements a dedicated watchdog timer with 1.56s timeout, independent of the reset comparator - it triggers WDO low on WDI inactivity (high or low state held >1.56s) and resets on any WDI transition. Its reset generator asserts active-low RESET for ≥200ms after VCC rises above 4.70V or MR falls below 1.10V, with immunity to transients ≤30µs at 100mV overdrive.
Power-fail detection uses a 2.50V internal reference applied to PFI; when PFI drops below threshold, PFO sinks ≥1.2mA. The LOW LINE output is absent (exclusive to MAX814), and RESET IN functionality is excluded (exclusive to MAX816). All logic interfaces are CMOS-compatible with internal 150µA MR pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reliable reset assertion across temperature, line, and load variation in +5V systems with ±5% supply tolerance. |
| Watchdog Timeout | 1.56 seconds - provides sufficient margin to detect firmware hangs without false triggers during normal ISR execution. |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization completes before release, meeting boot requirements of 8051, ARM Cortex-M0/M3, and similar cores. |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment such as handheld diagnostics and sensor nodes. |
| VCC Operating Range | 4.75V to 5.5V - supports stable supervision across full industrial-grade +5V rail tolerance (±5%) while maintaining reset accuracy. |
| RESET Valid Down To | VCC = 1V - maintains defined logic state during deep brownout, preventing undefined µP behavior before complete power collapse. |
| Power-Fail Reference | 2.50V - allows early warning of +5V rail degradation via external resistive divider on PFI, enabling controlled data save before reset. |
Pinout & Package
MAX815LCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width, RoHS-compliant lead-free finish (+ suffix), and commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low CMOS input with 150µA internal pull-up; triggers RESET when pulled below 1.10V; compatible with open-drain logic or momentary switch to GND. |
| 2 - VCC | Positive Power Supply | +5V supply input (4.75V–5.5V); powers all internal comparators, timer, and outputs; RESET asserted low when VCC < 4.70V. |
| 3 - GND | Ground Reference | Primary return path for all internal circuits and output sinks; must be low-impedance connection to system ground plane. |
| 4 - PFI | Power-Fail Input | Analog input referenced to 2.50V internal comparator; monitors external voltage divider; asserts PFO low when PFI < 2.50V. |
| 5 - PFO | Power-Fail Output | Active-low open-drain output sinking ≥1.2mA; used to generate NMI or trigger backup storage before main reset. |
| 6 - WDI | Watchdog Input | CMOS input monitoring µP activity; toggling required every <1.56s; transitions reset internal timer; no pull-up/pull-down. |
| 7 - RESET | Reset Output | Active-low push-pull output; drives µP reset pin directly; valid down to VCC = 1V; VOH = VCC − 1.5V, VOL ≤ 0.4V @ 3.2mA sink. |
| 8 - WDO | Watchdog Output | Active-low push-pull output; goes low on watchdog timeout or VCC < reset threshold; no minimum pulse width; fast edge response. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates need for external trimming in production; ensures consistent reset point across voltage, temperature, and unit-to-unit variation. |
| Independent watchdog with 1.56s timeout | Enables robust firmware health monitoring without interfering with reset timing; supports fail-safe recovery in embedded control loops. |
| 75µA max supply current | Reduces quiescent load on battery rails; extends operational life in portable medical devices and IoT edge sensors. |
| Guaranteed RESET validity to VCC = 1V | Prevents metastability in µP reset input during deep undervoltage; avoids undefined startup states in low-energy systems. |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive; prevents spurious resets caused by switching noise or ESD-induced rail dips. |
| 2.50V PFI reference for +5V systems | Allows precise early-warning threshold setting for +5V rail monitoring using standard resistor values (e.g., 1MΩ/1MΩ for ~2.5V). |
Applications
| Medical Diagnostic Handhelds | Battery-Powered Controllers |
|---|---|
|
Use Scenario: Portable glucose meters and ECG monitors operating from single Li-ion cells with DC-DC regulation to +5V. IC Role / Device Role / Timing Role: Supervises regulated +5V rail, asserts RESET on brownout, and triggers PFO-based data-save interrupt before shutdown. Use Value: Ensures clinical data integrity during battery depletion by initiating flash write and display disable within 200ms of undervoltage detection. |
Use Scenario: Industrial PLC I/O modules powered by 24VDC supplies with local +5V LDO regulation. IC Role / Device Role / Timing Role: Monitors +5V rail stability, detects firmware lockup via WDI, and forces hardware reset through WDO→MR feedback loop. Use Value: Restores deterministic control operation without host intervention after software faults, reducing unplanned downtime. |
| Set-Top Box Power Management | Intelligent Instrumentation |
|
Use Scenario: Consumer STBs with dual-rail power (standby +5VSB and main +5V), requiring clean boot and graceful shutdown. IC Role / Device Role / Timing Role: Uses PFI to monitor main +5V rail; asserts PFO to initiate EEPROM save and HDMI hotplug deassert before main reset. Use Value: Prevents configuration corruption and HDMI handshake failures during AC dropout events lasting 10–100ms. |
Use Scenario: Benchtop multimeters and oscilloscopes with FPGA-based front-end processing and µP-based UI. IC Role / Device Role / Timing Role: Provides synchronized reset to both FPGA configuration logic and ARM application processor on power-up and brownout. Use Value: Guarantees coherency between analog acquisition subsystem and digital processing chain during supply instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LCPA+ | No watchdog timer; includes LOW LINE output instead of WDI/WDO; identical reset threshold (4.70V) and PFI/PFO functionality. | Suitable where early low-line warning (NMI) is prioritized over firmware hang detection; lacks autonomous watchdog recovery path. | Select MAX814LCPA+ only if system relies on external watchdog or uses LOW LINE for predictive brownout alerts. |
| TPS3808G18DBVR | Fixed 1.8V reset threshold; 3.0V–6.0V VCC range; 350ms reset delay; no PFI/PFO; no watchdog; 1.6µA quiescent current. | Designed for low-voltage µPs (e.g., MSP430, nRF52); not compatible with +5V supervision or power-fail warning needs. | Choose TPS3808G18DBVR only for 1.8V-core systems requiring ultra-low IQ; not a functional substitute for MAX815LCPA+ in +5V applications. |
Compared with MAX814LCPA+, MAX815LCPA+ adds watchdog autonomy at the cost of losing LOW LINE; compared with TPS3808G18DBVR, it supports full +5V supervision with power-fail warning but consumes higher quiescent current - making it appropriate for reliability-critical, mid-power embedded systems rather than ultra-low-power wearables.
Availability
MAX815LCPA+ is available at Aetrix Electronics and suitable for medical diagnostics, industrial controllers, set-top boxes, and intelligent instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MAX815LCPA+ 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 accuracy, reliability, and integration.
The MAX815LCPA+ belongs to Maxim's µP supervisory product line, engineered specifically for robust power-on reset, brownout recovery, and firmware watchdog functions in +5V embedded systems with stringent accuracy and low-power requirements.
FAQ
What is the reset threshold voltage of the MAX815LCPA+?
The MAX815LCPA+ has a factory-set reset threshold of 4.70V ±1%, specified for operation with +5V supply systems. This value is fixed and determined by the "L" suffix in the part number. It ensures reset assertion occurs reliably across temperature, voltage, and process variation, supporting designs with ±5% power-supply tolerance. The MAX815LCPA+ does not support adjustable thresholds - that capability is exclusive to the MAX816 series.
Does the MAX815LCPA+ include a watchdog timer?
Yes, the MAX815LCPA+ integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. It monitors the WDI pin and asserts WDO low if WDI remains static (high or low) beyond that interval. The timer resets on every WDI transition. This function is absent in MAX814 and MAX816 variants, making the MAX815LCPA+ the only member of the family with built-in watchdog autonomy.
Can the MAX815LCPA+ monitor voltages other than VCC?
Yes - the MAX815LCPA+ can monitor auxiliary voltages using its PFI pin. By connecting a resistive divider from the target rail (e.g., +12V or +3.3V) to PFI, and referencing it against the internal 2.50V comparator, early power-fail warnings can be generated on PFO. The MAX815LCPA+ datasheet confirms this use case in Figure 11 and Applications Information section, with accuracy dependent on resistor tolerance and temperature drift.
What is the purpose of the WDO pin on the MAX815LCPA+?
The WDO (Watchdog Output) pin on the MAX815LCPA+ is an active-low push-pull output that goes low during watchdog timeout or when VCC falls below the 4.70V reset threshold. Unlike RESET, WDO has no minimum pulse width and responds immediately to threshold crossings. It is commonly connected to MR to convert watchdog timeouts into hardware resets, or routed to a µP NMI pin for diagnostic logging prior to reset.
Is the MAX815LCPA+ pin-compatible with other MAX814/MAX815 variants?
Yes - all MAX814/MAX815 variants (including MAX815LCPA+) share identical 8-pin PDIP/SO packaging and pinout. Pin functions are fully consistent across K/L/N/T suffixes: MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO occupy the same positions. This allows direct replacement within the same voltage grade (e.g., swapping MAX815KCPA+ for MAX815LCPA+) without PCB modification, provided the reset threshold requirement aligns with system design.
MAX815LCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX815LCPA+ FAQ
1.How can I place an order for MAX815LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815LCPA+ 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 MAX815LCPA+ reliable?
The price and inventory of MAX815LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX815LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815LCPA+?
MAX815LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815LCPA+ 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 MAX815LCPA+?
For technical support, including MAX815LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815LCPA+ requirements.
6.How does Aetrix verify that MAX815LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX815LCPA+ 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 MAX815LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX815LCPA+?
All MAX815LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX815LCPA+, 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 MAX815LCPA+ part is unused and in its original packaging.
Return procedure for MAX815LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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