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Analog Devices Inc./Maxim Integrated MAX814TEPA+
- Part No.:
- MAX814TEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX814TEPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
MAX814TEPA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit designed for +3V systems, providing power-on reset, manual reset, power-fail monitoring, and low-line detection. It features a 3.03V reset threshold (T-suffix), 200ms reset timeout, active-low RESET output, and guaranteed valid reset assertion down to VCC = 1V. It is used in portable medical instruments and battery-powered controllers requiring precise voltage supervision.
For engineers reviewing the MAX814TEPA+ datasheet, MAX814TEPA+ pinout, MAX814TEPA+ application, or MAX814TEPA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed electrical parameters (including 3.03V ±1% reset threshold, 75µA max supply current, and 60mV low-line offset), and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX814TEPA+ implements a precision reset comparator referenced to an internal bandgap, with hysteresis-free trip point at 3.03V ±1% over temperature and supply variation. Its low-line detector operates 60mV above the reset threshold with 2mV hysteresis, enabling early brownout warning before full reset assertion.
It integrates a manual-reset input (MR) with 150µA internal pull-up and CMOS-compatible thresholds (VMRLO = 1.1V, VMRHI = 0.7×VCC), and a power-fail comparator with 1.70V reference (PFI/PFO), fully independent of the reset path. No watchdog or adjustable reset functionality is present - distinguishing it from MAX815/MAX816 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - ensures reliable µP reset initiation across temperature and supply tolerance in 3.3V systems. |
| Reset Timeout | 200ms minimum - guarantees sufficient hold time for processor initialization after power-up or brownout recovery. |
| Supply Current | 75µA max - enables use in always-on, battery-critical applications like portable medical monitors. |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET output down to 1V, critical for graceful shutdown during deep brownout. |
| Low-Line Offset | 60mV above reset threshold - provides deterministic early warning before reset activation, allowing firmware response time. |
| Power-Fail Reference | 1.70V - enables undervoltage detection on auxiliary rails (e.g., +12V via divider) with predictable trip point. |
| MR Input Pull-Up | 150µA - allows direct switch-to-GND connection without external components; eliminates need for debounce circuitry. |
Pinout & Package
MAX814TEPA+ is housed in an 8-pin plastic DIP (PDIP) package with through-hole mounting, RoHS-compliant lead-free finish (+ suffix). Pin spacing is 0.300", body width 0.355", and total length 0.925".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input; triggers reset when pulled below 1.1V; internally pulled up to VCC at 150µA. |
| 2 VCC | Positive Power Supply | Main supply input (1.0V–5.5V); RESET remains asserted until VCC exceeds 3.03V and holds for 200ms. |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs; must be low-impedance for noise immunity. |
| 4 PFI | Power-Fail Input | Monitors external voltage via resistor divider; asserts PFO low when input falls below 1.70V. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; signals early power degradation to µP interrupt or control logic. |
| 6 LOW LINE | Low-Line Detector Output | Active-low open-drain output; goes low when VCC drops 60mV above reset threshold (3.09V typ). |
| 7 RESET | Reset Output | Active-low push-pull output; drives µP reset pin directly; valid down to VCC = 1V (VOL ≤ 0.4V @ ISINK = 3.2mA). |
| 8 RESET | Complementary Reset Output | Active-high push-pull output; inverse of pin 7; enables interface with µPs requiring high-active reset. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures first-pass system reliability across voltage, temperature, and aging. |
| Guaranteed RESET validity to VCC = 1V | Enables deterministic reset behavior during deep brownout, supporting safe state retention in portable devices. |
| 60mV low-line detection offset | Provides fixed, calibrated headroom between warning and reset assertion-critical for firmware-initiated shutdown. |
| 150µA MR internal pull-up | Permits momentary switch-to-ground implementation with no external components or debounce circuitry. |
| 1.70V PFI reference voltage | Allows precise, temperature-stable monitoring of auxiliary rails (e.g., +12V) using standard resistor dividers. |
Applications
| Medical Instrumentation | Portable Diagnostic Controllers |
|---|---|
|
Use Scenario: Handheld blood glucose meters and portable ECG units operating from single-cell Li-ion batteries with tight voltage margins. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled shutdown when battery voltage falls to 3.09V (LOW LINE), then full reset at 3.03V. Use Value: Prevents data corruption by ensuring µP executes save routines before power collapse, leveraging 60mV warning margin and 200ms reset hold. |
Use Scenario: Battery-powered industrial controllers deployed in remote field locations with infrequent maintenance. IC Role / Device Role / Timing Role: Monitors both main 3.3V supply (via VCC) and backup supercapacitor rail (via PFI divider) to initiate fail-safe state capture. Use Value: Dual-path supervision extends operational uptime and enables graceful fallback using PFO-triggered interrupt before VCC reset occurs. |
| Set-Top Box Power Management | Intelligent Sensor Nodes |
|
Use Scenario: Consumer STBs with multi-rail power supplies (3.3V, 1.8V, 12V) requiring coordinated reset sequencing and brownout resilience. IC Role / Device Role / Timing Role: Provides primary 3.3V reset supervision while using PFI to monitor 12V rail via 7:1 divider, asserting PFO to trigger secondary supervisor. Use Value: Enables hierarchical power failure response-early warning on 12V sag avoids downstream regulator instability before 3.3V collapse. |
Use Scenario: Wireless environmental sensor nodes powered by energy harvesting (e.g., solar + supercap) with highly variable input voltage. IC Role / Device Role / Timing Role: Uses LOW LINE output to wake µP from deep sleep when harvested voltage crosses 3.09V, then asserts RESET at 3.03V if insufficient charge accumulates. Use Value: Eliminates need for separate voltage supervisors-single IC handles both wake-up signaling and hard reset, reducing BOM count and leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TESA+ | Same electrical specs and pinout, but in 8-pin SO package (surface-mount) instead of PDIP. | Required for PCBs using SMT assembly; not suitable for through-hole prototyping or legacy DIP footprints. | Select MAX814TESA+ when board layout mandates SO-8 footprint and reflow soldering. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (±0.5% typical), 35µA quiescent current, no LOW LINE output, no PFO/PFI. | Lacks dual-output warning capability and auxiliary rail monitoring; suited only for basic reset-only functions. | Choose TPS3808G33DBVR where ultra-low power (<40µA) is critical and early brownout warning is unnecessary. |
Compared with MAX814TEPA+, MAX814TESA+ offers identical supervision functionality in a space-saving SO-8 package, while TPS3808G33DBVR trades warning features and higher accuracy tolerance for lower supply current-making it viable only when LOW LINE and PFI/PFO are unused.
Availability
MAX814TEPA+ is available at Aetrix Electronics and suitable for medical instrumentation, portable diagnostic controllers, set-top box power management, and intelligent sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for MAX814TEPA+ 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.
The MAX814 series belongs to Maxim's µP supervisory product line, engineered specifically for high-accuracy, low-power voltage monitoring in battery-operated and mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX814TEPA+?
The MAX814TEPA+ has a factory-trimmed reset threshold of 3.03V ±1% over temperature and supply range. This value is fixed and corresponds to the 'T' suffix in the part number. The threshold is guaranteed across the commercial temperature range (0°C to +70°C) and remains stable under load, making it suitable for 3.3V systems with tight supply tolerances.
Does the MAX814TEPA+ include a watchdog timer function?
No, the MAX814TEPA+ does not include a watchdog timer. That feature is exclusive to the MAX815 variant (e.g., MAX815TEPA+). The MAX814TEPA+ provides only power-on reset, manual reset, power-fail monitoring (PFI/PFO), and low-line detection (LOW LINE), with no WDI or WDO pins or associated timing circuitry.
Can the MAX814TEPA+ monitor voltages other than VCC?
Yes - the MAX814TEPA+ can monitor auxiliary rails using its PFI input. By connecting a resistor divider to PFI, any voltage (e.g., +12V or negative supplies) can be scaled to match the 1.70V internal reference. When the divided voltage falls below 1.70V, PFO asserts low, enabling early warning for non-VCC rails without modifying the reset threshold.
What is the purpose of the LOW LINE pin on the MAX814TEPA+?
The LOW LINE pin on the MAX814TEPA+ is an active-low open-drain output that asserts when VCC falls to 60mV above the 3.03V reset threshold (i.e., ~3.09V). It provides deterministic early warning before full reset activation, allowing firmware to execute save routines, disable peripherals, or enter low-power states before the µP loses operational margin.
Is the MAX814TEPA+ pin-compatible with other MAX814 variants like MAX814LEPA+?
Yes - all MAX814 variants (K, L, N, T suffixes) share identical pinout, package, and functional architecture. The only difference is the factory-set reset threshold voltage. Therefore, MAX814TEPA+ is mechanically and electrically pin-compatible with MAX814LEPA+ or MAX814KEPA+, but substituting them changes the reset point (e.g., 4.70V vs. 3.03V), requiring corresponding system-level validation.
MAX814TEPA+ 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:
- -
MAX814TEPA+ FAQ
1.How can I place an order for MAX814TEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TEPA+ 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 MAX814TEPA+ reliable?
The price and inventory of MAX814TEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TEPA+ is usually 5 days.
3.What payment methods are accepted for MAX814TEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TEPA+?
MAX814TEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TEPA+ 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 MAX814TEPA+?
For technical support, including MAX814TEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TEPA+ requirements.
6.How does Aetrix verify that MAX814TEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814TEPA+ 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 MAX814TEPA+ meets industry standards.
7.What is the process for return or replacement of MAX814TEPA+?
All MAX814TEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TEPA+, 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 MAX814TEPA+ part is unused and in its original packaging.
Return procedure for MAX814TEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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