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Analog Devices Inc./Maxim Integrated MAX814NEPA+
- Part No.:
- MAX814NEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX814NEPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
MAX814NEPA+ from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit providing power-on reset, manual reset, and early power-fail warning functions for +5V systems. It features a 4.55V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, and guaranteed valid reset assertion down to VCC = 1V. It is used in critical embedded controllers requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX814NEPA+ datasheet, MAX814NEPA+ pinout, MAX814NEPA+ application, or MAX814NEPA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing and threshold behavior, power-fail comparator operation with 2.50V reference, and validated alternative options for 4.55V-supervised +5V µP systems.
Technical Context
The MAX814NEPA+ implements a precision voltage-monitoring architecture with independent reset, low-line, and power-fail comparators - all referenced to internal bandgap references. Its reset comparator ignores transients ≤30µs at 100mV overdrive, and its low-line detector triggers 60mV above the 4.55V reset threshold with 2mV hysteresis.
It integrates a 150µA internal MR pullup, supports manual reset via CMOS/TTL-compatible input, and asserts RESET low during power-up until VCC exceeds 4.55V and remains stable for ≥200ms. The PFI input accepts external voltage dividers for monitoring auxiliary rails, with PFO delivering open-drain active-low warning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.55V ±1% - precisely initiates reset when +5V supply falls below system-safe operating margin. |
| Reset Pulse Width | 200ms minimum - ensures µP completes full initialization before release from reset state. |
| Supply Current | 75µA max - enables use in battery-powered portable equipment without significant drain. |
| VCC Operating Range | 4.60V to 5.5V - compatible with standard +5V systems including ±5% tolerance designs. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pullup. |
| Power-Fail Reference | 2.50V - enables early warning of +5V rail collapse using simple resistor divider on PFI. |
| Low-Line Threshold | 4.61V (4.55V + 60mV) - provides NMI-triggered pre-reset alert for controlled shutdown. |
Pinout & Package
MAX814NEPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant and lead-free per ordering suffix '+'.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | CMOS/TTL-compatible active-low input; internal 150µA pullup to VCC; triggers reset when pulled <1.10V. |
| 2 | VCC | +5V supply input; reset asserted while VCC < 4.55V; RESET valid down to VCC = 1V. |
| 3 | GND | Ground reference for all internal comparators and outputs. |
| 4 | PFI (Power-Fail Input) | High-impedance input compared to 2.50V reference; used with external divider to monitor auxiliary rails. |
| 5 | PFO (Power-Fail Output) | Open-drain active-low output; sinks ≥1.2mA when PFI < 2.50V; signals impending supply failure. |
| 6 | LOW LINE | Active-low open-drain output; asserts when VCC falls to 4.61V; enables pre-reset NMI interrupt. |
| 7 | RESET | Active-low open-drain reset output; held low for ≥200ms after VCC rises above 4.55V. |
| 8 | RESET | Active-high reset output (inverted); provided for systems requiring active-high reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Ensures deterministic reset initiation across temperature, voltage, and process variation in safety-critical systems. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during deep brownout by maintaining known logic level until near complete power loss. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - eliminates false resets from switching noise. |
| Independent low-line detector | Provides 60mV early-warning margin above reset threshold - enables time-critical data save before reset. |
| Configurable PFI monitoring | Supports monitoring of +12V, +3.3V, or negative rails via external resistive dividers - extends supervision beyond VCC. |
Applications
| Medical Instrumentation | Industrial Controllers |
|---|---|
|
Use Scenario: Portable ECG monitors powered by Li-ion batteries with dual-rail +5V/+3.3V supplies. IC Role / Device Role / Timing Role: Supervises +5V µP supply and triggers low-line NMI at 4.61V to initiate flash save before brownout-induced reset. Use Value: Enables reliable data retention during battery sag without external timing components or firmware overhead. |
Use Scenario: PLC I/O modules operating in factory environments with noisy 5V backplane supplies. IC Role / Device Role / Timing Role: Detects 5V rail collapse and asserts RESET within 200ms to prevent corrupted register writes during undervoltage. Use Value: Eliminates need for discrete RC reset circuits and improves immunity to transient-induced spurious resets. |
| Set-Top Box Power Management | Critical µP Power Monitoring |
|
Use Scenario: Consumer STB with standby-to-wake transition requiring clean +5V sequencing and fail-safe boot. IC Role / Device Role / Timing Role: Monitors main +5V rail and asserts RESET until stable; uses PFI to verify +12V tuner supply integrity. Use Value: Prevents boot failures caused by marginal 5V rail rise time or delayed +12V stabilization. |
Use Scenario: Avionics data acquisition unit where µP must never execute invalid code due to supply droop. IC Role / Device Role / Timing Role: Provides dual-level supervision: LOW LINE for early warning and RESET for hard reset at 4.55V. Use Value: Meets DO-254 deterministic reset requirements with no software dependency or calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | 4.70V ±1% reset threshold; same 8-pin SO package; identical feature set except threshold value. | Designed for +5V systems with ±5% supply tolerance; higher trip point delays reset assertion slightly longer. | Select when system requires earlier reset than 4.55V - e.g., to accommodate wider VCC ripple or tighter µP VIL margin. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms reset timeout; 2.9V to 6.0V VCC range; no LOW LINE output. | Targeted at +3.3V µP systems; lacks pre-reset warning capability and dual reset polarity. | Choose only for 3.3V-only applications where low-line alert is unnecessary and longer reset hold time is acceptable. |
Compared with MAX814NEPA+, MAX814LESA+ offers higher reset voltage for looser supply tolerances but identical supervision architecture, while TPS3808G33DBVR serves a different voltage class and omits critical pre-failure signaling - making MAX814NEPA+ uniquely suited for 4.55V-guard-banded +5V systems needing both reset and early warning.
Availability
MAX814NEPA+ is available at Aetrix Electronics and suitable for medical instrumentation, industrial controllers, set-top boxes, and critical µP power monitoring requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for MAX814NEPA+ 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, communications, and computing applications.
The MAX814 family was designed specifically for high-reliability microprocessor supervision in +5V systems, emphasizing ±1% threshold accuracy, ultra-low quiescent current, and robust transient immunity - targeting applications where deterministic reset behavior is non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX814NEPA+?
The MAX814NEPA+ has a factory-trimmed reset threshold of 4.55V ±1%, specified over the commercial temperature range (0°C to +70°C). This value is fixed and corresponds to the 'N' suffix in the part number. Electrical characteristics confirm a typical threshold of 4.68V at VCC rising, with min/max bounds ensuring worst-case operation at 4.50V and 4.60V respectively under full conditions.
Does the MAX814NEPA+ provide both active-low and active-high reset outputs?
Yes, the MAX814NEPA+ provides dual reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET (the logical inverse). Both outputs are open-drain and require external pullup resistors. This dual-output configuration supports systems with mixed reset polarity requirements without additional logic.
Can the MAX814NEPA+ monitor voltages other than VCC, such as +12V or negative rails?
Yes - the PFI pin accepts externally derived voltages via resistor dividers. For example, a 340kΩ/100kΩ divider on a +12V rail yields ~3.03V at PFI, triggering PFO when the +12V supply drops below ~11.0V. Negative rails can also be monitored using the circuit in Figure 12 of the datasheet, leveraging the 2.50V internal PFI reference.
What is the purpose of the LOW LINE output on the MAX814NEPA+?
The LOW LINE output on the MAX814NEPA+ is an active-low open-drain signal that asserts when VCC falls to 60mV above the 4.55V reset threshold (i.e., at 4.61V). It provides a pre-reset warning to trigger non-maskable interrupts (NMI), enabling µPs to perform critical housekeeping - like saving volatile data - before the main RESET activates at 4.55V.
Is the MAX814NEPA+ compatible with battery-powered portable equipment?
Yes - the MAX814NEPA+ draws only 75µA maximum supply current and guarantees RESET validity down to VCC = 1V, making it ideal for portable/battery-powered equipment. Its low quiescent current extends battery life, and its deep brownout operation ensures µP remains held in reset even as battery voltage collapses.
MAX814NEPA+ 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:
- -
MAX814NEPA+ FAQ
1.How can I place an order for MAX814NEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814NEPA+ 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 MAX814NEPA+ reliable?
The price and inventory of MAX814NEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814NEPA+ is usually 5 days.
3.What payment methods are accepted for MAX814NEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814NEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814NEPA+?
MAX814NEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814NEPA+ 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 MAX814NEPA+?
For technical support, including MAX814NEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814NEPA+ requirements.
6.How does Aetrix verify that MAX814NEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814NEPA+ 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 MAX814NEPA+ meets industry standards.
7.What is the process for return or replacement of MAX814NEPA+?
All MAX814NEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814NEPA+, 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 MAX814NEPA+ part is unused and in its original packaging.
Return procedure for MAX814NEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814NEPA+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
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APX803L20-29SA-7
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