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Analog Devices Inc./Maxim Integrated MAX814LESA-T
- Part No.:
- MAX814LESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814LESA-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:6,475
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Product details
Overview
MAX814LESA-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 ±1% worst-case reset threshold accuracy (4.7V), 200ms reset pulse width, active-low RESET output, guaranteed valid reset down to VCC = 1V, and 75µA max supply current. It is used in medical equipment and portable battery-powered controllers requiring reliable brownout detection and glitch immunity.
For engineers reviewing the MAX814LESA-T datasheet, MAX814LESA-T pinout, MAX814LESA-T application, or MAX814LESA-T equivalent, key selection considerations include its fixed 4.7V reset threshold, SO-8 package compatibility, low-line detector functionality, and absence of watchdog timer-distinguishing it from MAX815/MAX816 variants.
Technical Context
The MAX814LESA-T implements a precision voltage comparator with ±1% accuracy over temperature and supply variation, monitoring VCC directly to assert RESET when voltage falls below 4.7V (±1%). Its low-line detector triggers at 60mV above the reset threshold (i.e., ~4.76V), enabling early warning before full reset activation.
It integrates a 150µA internal MR pull-up, supports CMOS/TTL-compatible manual reset input, and provides independent PFI/PFO circuitry with 2.50V power-fail reference-enabling external voltage monitoring via resistive dividers. The device operates across 4.75V to 5.5V VCC and guarantees RESET validity down to 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reliable reset initiation in 5V systems with ±5% supply tolerance |
| Reset Pulse Width | 200ms minimum - guarantees µP initialization time after power-up or brownout recovery |
| Supply Current | 75µA max - enables use in always-on, battery-backed applications without significant drain |
| VCC Operating Range | 4.75V to 5.5V - matches standard +5V rail tolerances and supports industrial-grade stability |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pull-up |
| Low-Line Threshold | 60mV above reset threshold (~4.76V) - provides early warning for orderly shutdown before reset asserts |
| Power-Fail Reference | 2.50V - enables monitoring of auxiliary rails (e.g., +12V) using external resistor divider |
Pinout & Package
MAX814LESA-T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free compatible, with standard 1.27mm pitch and gull-wing leads suitable for automated PCB assembly.
| 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 |
| 2 VCC | Positive Power Supply | Main +5V supply input; RESET asserted when VCC < 4.70V; valid operation down to 1V |
| 3 GND | Ground Reference | System ground return path for all internal comparators and outputs |
| 4 PFI | Power-Fail Input | Monitors external voltage via resistor divider; trips at 2.50V reference for early warning |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI undervoltage; sinks ≥1.2mA |
| 6 LOW LINE | Low-Line Detector Output | Active-low open-drain output asserting ~4.76V; used for NMI-triggered pre-reset alert |
| 7 RESET | Reset Output | Active-low open-drain reset signal; guaranteed logic low ≤0.4V at 3.2mA sink |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; high when RESET is inactive, low during reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset behavior across temperature, voltage, and process variation |
| Guaranteed RESET validity to VCC = 1V | Enables robust reset assertion during deep brownout conditions where other supervisors fail |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive, preventing spurious resets in noisy environments |
| Independent low-line detector | Provides 60mV hysteresis-based early warning for controlled shutdown before main reset activates |
| 2.50V PFI reference with open-drain PFO | Allows flexible monitoring of non-VCC rails (e.g., +12V) with minimal external components |
Applications
| Medical Diagnostic Controller | Industrial PLC I/O Module |
|---|---|
Use Scenario: Real-time patient monitoring system powered by regulated +5V supply with battery backup. IC Role / Device Role / Timing Role: Supervises VCC integrity, asserts RESET on brownout, and triggers LOW LINE interrupt for data save before power loss. Use Value: Prevents corrupted EEPROM writes and ensures deterministic µP restart after brief line sags-meeting IEC 60601-1 reliability requirements. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated I/O and field power inputs. IC Role / Device Role / Timing Role: Monitors primary +5V logic rail and secondary +24V field supply via PFI divider; generates dual-alert sequence (LOW LINE → RESET). Use Value: Enables graceful I/O state freeze and watchdog timeout coordination during partial power failure-reducing false tripping in electrically harsh factory environments. |
| Portable Ultrasound Handset | Set-Top Box Power Management |
Use Scenario: Battery-operated handheld ultrasound unit with low-power sleep mode and fast wake-up. IC Role / Device Role / Timing Role: Provides VCC supervision during battery discharge curve crossing; uses LOW LINE to initiate ADC calibration halt before reset. Use Value: Extends usable battery life by avoiding premature reset while ensuring clean µP restart at end-of-discharge-critical for FDA-cleared portable devices. |
Use Scenario: Consumer set-top box with multiple voltage rails (+5V, +3.3V, +1.8V) and HDMI hot-plug detection. IC Role / Device Role / Timing Role: Supervises main +5V rail and monitors +12V tuner supply via PFI; coordinates RESET with firmware-controlled power sequencing. Use Value: Eliminates boot-loop failures caused by marginal +12V tuner supply sag during channel change-improving user experience and reducing RMA rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | Identical electrical specs and pinout; lead-free packaging only (no Pb), same SO-8 footprint | No functional difference; selected when RoHS compliance is mandatory and legacy leaded parts are restricted | Drop-in replacement for MAX814LESA-T in new designs requiring lead-free assembly |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 350ms reset delay, no low-line output, 1.6µA quiescent current | Suitable for low-voltage µPs but lacks early-warning capability and +5V threshold match | Choose only if system uses 3.3V core supply and ultra-low power dominates over brownout warning needs |
Compared with MAX814LESA-T, MAX814LESA+ offers identical supervision performance in a RoHS-compliant package, while TPS3808G33DBVR trades low-line detection and 4.7V accuracy for sub-µA supply current-making it unsuitable for +5V brownout-critical applications requiring pre-reset alerting.
Availability
MAX814LESA-T is available at Aetrix Electronics and suitable for medical diagnostic controllers, industrial PLC I/O modules, portable ultrasound handsets, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX814LESA-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 high-reliability microprocessor supervision in mission-critical +5V systems-emphasizing ±1% threshold accuracy, glitch immunity, and dual-output reset signaling to meet stringent safety and uptime requirements.
FAQ
What is the exact reset threshold voltage of the MAX814LESA-T?
The MAX814LESA-T has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy across temperature and supply variation. This value is confirmed in the Electrical Characteristics table for +5V parts under MAX814L conditions (VCC = 4.75V to 5.5V, TA = 0°C to +70°C). The 'L' suffix explicitly denotes the 4.7V variant, and the MAX814LESA-T datasheet specifies 4.65V (min), 4.70V (typ), and 4.75V (max) at 25°C.
Does the MAX814LESA-T include a watchdog timer function?
No, the MAX814LESA-T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX815 variant (e.g., MAX815LESA-T), which adds WDI and WDO pins and a 1.56-second timeout. The MAX814LESA-T pinout omits WDI/WDO and instead provides LOW LINE and dual RESET outputs-confirming its role as a pure supervisor without autonomous software monitoring.
Can the MAX814LESA-T monitor voltages other than VCC?
Yes, the MAX814LESA-T can monitor auxiliary voltages using its PFI pin. With a 2.50V internal reference, an external resistor divider scales higher rails (e.g., +12V) to trip PFI when the monitored voltage falls below a calculated threshold. For example, a 340kΩ/100kΩ divider on +12V yields ~2.73V at PFI-triggering PFO when +12V drops below ~11.0V, as verified in Figure 11 of the MAX814 datasheet.
What is the purpose of the LOW LINE pin on the MAX814LESA-T?
The LOW LINE pin on the MAX814LESA-T is an active-low open-drain output that asserts ~60mV above the 4.70V reset threshold (i.e., ~4.76V), providing early warning of impending brownout. It enables µP firmware to execute critical tasks-such as saving volatile data or disabling peripherals-before RESET activates, extending system responsiveness during marginal supply conditions.
Is the MAX814LESA-T compatible with 3.3V systems?
No, the MAX814LESA-T is specified only for +5V operation (4.75V to 5.5V VCC range) and is not rated for 3.3V systems. Its 4.70V reset threshold and 2.50V PFI reference are optimized for 5V rails. For 3.3V supervision, Maxim offers the MAX814TEUA-T (T-suffix, 3.03V threshold) or MAX816 variants-neither of which share pin compatibility or electrical characteristics with the MAX814LESA-T.
MAX814LESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.7V
- 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
MAX814LESA-T FAQ
1.How can I place an order for MAX814LESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LESA-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 MAX814LESA-T reliable?
The price and inventory of MAX814LESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LESA-T is usually 5 days.
3.What payment methods are accepted for MAX814LESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LESA-T?
MAX814LESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LESA-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 MAX814LESA-T?
For technical support, including MAX814LESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LESA-T requirements.
6.How does Aetrix verify that MAX814LESA-T is sourced from the original manufacturer or authorized distributors?
All MAX814LESA-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 MAX814LESA-T meets industry standards.
7.What is the process for return or replacement of MAX814LESA-T?
All MAX814LESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LESA-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 MAX814LESA-T part is unused and in its original packaging.
Return procedure for MAX814LESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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