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Analog Devices Inc./Maxim Integrated MAX814NESA+T
- Part No.:
- MAX814NESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814NESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,055
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Product details
Overview
MAX814NESA+T 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 RESET validity down to VCC = 1V. It is used in medical equipment and portable battery-powered devices requiring reliable brownout detection and glitch immunity.
For engineers reviewing the MAX814NESA+T datasheet, MAX814NESA+T pinout, MAX814NESA+T application, or MAX814NESA+T equivalent, this page delivers verified electrical parameters, package mapping, functional role in µP power monitoring, and validated alternative options - all specific to the N-suffix 4.55V variant in 8-pin SO package with lead-free finish.
Technical Context
The MAX814NESA+T implements a precision voltage-monitoring architecture with independent reset comparator, low-line detector (60mV above reset threshold), and power-fail comparator (2.50V reference). Its reset assertion is guaranteed for VCC ≥ 1V, and it ignores transients ≤30µs at 100mV overdrive below threshold.
It includes a 150µA internal MR pull-up, supports CMOS/TTL-level manual reset input, and provides PFO output capable of sinking ≥1.2mA. Unlike MAX815/MAX816, it lacks watchdog or adjustable reset functionality - confirming its dedicated role as a fixed-threshold, dual-comparator supervisory IC for stable +5V supply monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.55V ±1% - precisely triggers 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 always-on battery-backed systems without significant drain. |
| VCC Operating Range | 4.60V to 5.5V - compatible with standard +5V rails including ±10% tolerance designs. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pull-up. |
| Power-Fail Reference | 2.50V - enables early warning for +5V or +12V supplies via resistive divider on PFI pin. |
| Low-Line Threshold Offset | 60mV above reset threshold - provides pre-reset warning for orderly shutdown in portable gear. |
Pinout & Package
MAX814NESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), with 1.27mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pull-up; asserts reset when pulled below 1.10V. |
| 2 VCC | Positive Supply Input | +5V supply pin; RESET remains valid down to 1V, enabling brownout detection before full rail collapse. |
| 3 GND | Ground Reference | Common return path for all internal comparators and outputs; must be low-impedance. |
| 4 PFI | Power-Fail Input | High-impedance input referenced to 2.50V; monitors auxiliary voltages (e.g., +12V) via external divider. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V; used to trigger µP interrupt before reset. |
| 6 LOW LINE | Low-Line Warning Output | Open-drain output asserting ~60mV below reset threshold; signals impending reset for shutdown prep. |
| 7 RESET | Reset Output | Active-low open-drain output; guaranteed logic low ≤0.4V at ISINK = 3.2mA during reset condition. |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; logic high during reset, useful for direct interface to µP reset inputs requiring high-active signal. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Ensures deterministic reset timing across temperature, voltage, and process variation - critical for safety-critical medical controllers. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP behavior during deep brownout; eliminates need for external undervoltage lockout circuitry. |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive - avoids spurious resets in noisy industrial or automotive environments. |
| Independent low-line detector | Provides 60mV pre-reset warning window - enables µP to save state and shut down peripherals before hard reset. |
| 2.50V PFI reference | Supports robust early-warning monitoring of +5V and higher rails (e.g., +12V via 4.8:1 divider) without external references. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and brownout protection in handheld diagnostic devices with Li-ion battery backup. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET when main 5V rail drops below 4.55V or battery voltage sags near cutoff. Use Value: Prevents corrupted memory writes and firmware crashes during battery depletion, extending usable runtime and ensuring data integrity. |
Use Scenario: Low-power state management in wireless sensor nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Monitoring VCC and generating early LOW LINE warning to initiate graceful sleep mode before reset occurs. Use Value: Reduces average current draw by >40% via preemptive shutdown, increasing battery life from weeks to months. |
| Controllers | Set-Top Boxes |
Use Scenario: Industrial PLC I/O modules requiring deterministic startup and fault recovery under fluctuating 5V bus voltage. IC Role / Device Role / Timing Role: Providing 200ms reset hold time and manual reset via front-panel button (MR pin). Use Value: Eliminates need for external RC timing networks and debouncing circuits - simplifies BOM and improves field reliability. |
Use Scenario: Power supervision in consumer STBs with multiple voltage rails (+5V, +3.3V, +12V) and thermal derating requirements. IC Role / Device Role / Timing Role: Using PFI/PFO to monitor +12V supply and assert RESET if AC adapter fails or overheats. Use Value: Enables safe firmware rollback and EEPROM preservation during ungraceful power loss - reducing warranty returns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+T | 4.70V ±1% reset threshold; otherwise identical pinout, timing, and feature set. | Designed for +5V systems with ±5% supply tolerance; higher trip point delays reset vs. N-suffix. | Select when system requires earlier reset assertion than 4.55V - e.g., to protect 5V logic with tighter VCC min spec. |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 350ms reset timeout; 2.5µA quiescent current; SOT-23-6 package. | Optimized for ultra-low-power +3.3V systems; lacks LOW LINE and dual RESET outputs. | Choose only for space-constrained +3.3V designs where 4.55V threshold is incompatible and low-line warning is unnecessary. |
Compared with MAX814NESA+T, MAX814LESA+T offers higher reset voltage for looser-tolerance 5V rails, while TPS3808G33DBVR trades threshold flexibility and dual outputs for extreme low-power operation in smaller footprint - neither is pin-compatible, but both serve adjacent supervisory roles in distinct voltage domains.
Availability
MAX814NESA+T is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, and industrial controllers requiring stable component supply with guaranteed long-term availability and RoHS-compliant lead-free packaging.
Supply support for MAX814NESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX814 family was designed specifically for precision µP power monitoring in mission-critical systems - delivering ±1% reset accuracy, low supply current, and multi-function supervision (reset, power-fail, low-line) in compact SO packages.
FAQ
What is the exact reset threshold voltage of the MAX814NESA+T?
The MAX814NESA+T has a factory-trimmed reset threshold of 4.55V ±1%, specified over temperature and supply voltage range. This value is fixed and non-adjustable - unlike the MAX816, which uses an external resistor divider. The N-suffix explicitly denotes this 4.55V threshold, and it is validated per Maxim's Electrical Characteristics table for +5V parts (VCC = 4.60V to 5.5V).
Does the MAX814NESA+T include a watchdog timer function?
No, the MAX814NESA+T does not include a watchdog timer. That function is exclusive to the MAX815 variant (e.g., MAX815NESA+T). The MAX814NESA+T provides only power-on reset, manual reset, power-fail monitoring (PFI/PFO), and low-line warning (LOW LINE) - confirmed by its block diagram, pinout (no WDI/WDO pins), and Selector Table in the official datasheet.
Can the MAX814NESA+T monitor voltages other than VCC?
Yes, the MAX814NESA+T can monitor auxiliary voltages using its PFI pin. With a resistive divider, it detects when +12V, +3.3V, or negative rails fall below their safe thresholds - for example, a 4.8:1 divider on +12V yields ~2.5V at PFI, triggering PFO when the rail drops below ~11V. This capability is documented in Figures 11–12 and Applications Information section of the MAX814 datasheet.
What is the purpose of the LOW LINE pin on the MAX814NESA+T?
The LOW LINE pin on the MAX814NESA+T is an open-drain output that asserts ~60mV below the 4.55V reset threshold (i.e., at ~4.49V), providing early warning of imminent reset. It enables µPs to execute shutdown routines - such as saving RAM contents or disabling peripherals - before the hard reset occurs, improving system robustness in battery-powered applications.
Is the MAX814NESA+T pin-compatible with other MAX814 variants like MAX814LESA+T?
Yes, the MAX814NESA+T is fully pin-compatible with all other MAX814 variants (K, L, T) in the same SO-8 package. They share identical pinout, electrical timing, and functional block diagram - differing only in reset threshold voltage (4.55V for N, 4.70V for L, etc.) and PFI reference (2.50V for K/L/N). No PCB changes are required when substituting within the MAX814 family.
MAX814NESA+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:
- 4.55V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814NESA+T FAQ
1.How can I place an order for MAX814NESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814NESA+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 MAX814NESA+T reliable?
The price and inventory of MAX814NESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814NESA+T is usually 5 days.
3.What payment methods are accepted for MAX814NESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814NESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814NESA+T?
MAX814NESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814NESA+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 MAX814NESA+T?
For technical support, including MAX814NESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814NESA+T requirements.
6.How does Aetrix verify that MAX814NESA+T is sourced from the original manufacturer or authorized distributors?
All MAX814NESA+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 MAX814NESA+T meets industry standards.
7.What is the process for return or replacement of MAX814NESA+T?
All MAX814NESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814NESA+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 MAX814NESA+T part is unused and in its original packaging.
Return procedure for MAX814NESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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