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Analog Devices Inc./Maxim Integrated MAX814TESA+
- Part No.:
- MAX814TESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814TESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:806
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Product details
Overview
MAX814TESA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit designed for +3V systems. It provides power-on reset, manual reset input, power-fail monitoring (PFI/PFO), and low-line detection - all with guaranteed RESET validity down to VCC = 1V and 75µA max supply current. It is used in portable medical instruments and battery-powered controllers requiring precise brownout protection.
For engineers reviewing the MAX814TESA+ datasheet, MAX814TESA+ pinout, MAX814TESA+ application, or MAX814TESA+ equivalent, this page delivers verified functional identity, confirmed 8-pin SO package mapping, validated reset threshold (3.03V ±1%), exact pin roles (e.g., MR, PFI, LOW LINE), and two technically documented alternative parts with explicit differences in watchdog and reset output polarity.
Technical Context
The MAX814TESA+ implements a fixed 3.03V ±1% reset threshold optimized for 3.3V systems, with a dedicated low-line comparator asserting LOW LINE when VCC falls 60mV above that threshold. Its power-fail comparator uses a 1.70V internal reference (PFI threshold) and drives PFO active-low upon undervoltage detection.
It features an active-low RESET output with 200ms minimum pulse width, manual reset input (MR) with 150µA internal pull-up, and guaranteed logic-level RESET assertion down to VCC = 1V. Unlike MAX815/MAX816, it lacks watchdog functionality and adjustable reset input - confirming its role as a pure reset/monitoring IC for deterministic 3V applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - precisely matches 3.3V supply tolerance requirements; enables reliable reset initiation before µP operational failure. |
| Supply Current | 75µA max - enables multi-year battery life in portable equipment without compromising reset accuracy. |
| RESET Pulse Width | 200ms min - ensures full µP initialization and register clearing during power-up or brownout recovery. |
| VCC Operating Range | 1.0V to 5.5V - guarantees functional RESET output even during deep brownout conditions down to 1V. |
| Low-Line Threshold | 60mV above reset threshold - provides early warning of supply degradation while avoiding false triggers from noise. |
| Power-Fail Reference | 1.70V - allows accurate monitoring of 3.3V rails via external divider; PFO sinks ≥1.2mA on fault. |
| MR Input Threshold | 1.10V max low-level - compatible with CMOS/TTL logic and mechanical switches without external level-shifting. |
Pinout & Package
MAX814TESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (indicated by '+' suffix). Pin spacing is 1.27mm, body width 3.9mm, and total length 4.9mm - compatible with standard SO-8 PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Manual-reset input; active-low, internally pulled up to VCC (150µA); triggers reset when <1.10V. |
| 2 | VCC | Positive supply input; RESET remains asserted until VCC rises >3.03V and holds for 200ms. |
| 3 | GND | Ground reference for all comparators and outputs; must be low-impedance for glitch immunity. |
| 4 | PFI | Power-fail input; compared to 1.70V reference; use with resistor divider to monitor 3.3V or other rails. |
| 5 | PFO | Power-fail output; open-drain, active-low; sinks ≥1.2mA when PFI <1.70V - connects to µP interrupt. |
| 6 | LOW LINE | Low-line detector output; active-low; asserts when VCC drops 60mV above 3.03V reset point. |
| 7 | RESET | Active-low reset output; guaranteed logic low (≤0.4V) down to VCC = 1V; 200ms min pulse width. |
| 8 | RESET | Active-high reset output; inverted copy of pin 7; provided for µP reset inputs requiring high-active signal. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures system-level reset timing compliance across temperature, voltage, and process variation. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during deep brownout; avoids latch-up or data corruption in low-voltage shutdown sequences. |
| Low-line detector with 60mV hysteresis | Provides deterministic early-warning interrupt before reset assertion - enabling controlled data save and peripheral shutdown. |
| Power-fail comparator with 1.70V reference | Enables precise monitoring of 3.3V supplies using simple resistor dividers; supports dual-rail supervision without extra ICs. |
| 75µA maximum supply current | Reduces quiescent load on coin-cell or Li-ion batteries - critical for portable medical and handheld instrumentation. |
Applications
| Medical Portable Monitors | Battery-Powered Controllers |
|---|---|
Use Scenario: Wearable ECG or glucose meter operating from single Li-ion cell with dynamic load and variable ambient temperature. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, early low-voltage warning (LOW LINE), and power-fail alert (PFO) before battery reaches cutoff. Use Value: Ensures safe shutdown and data retention at VCC ≥1.0V; 3.03V threshold aligns with 3.3V LDO dropout, preventing premature reset. |
Use Scenario: Industrial sensor node powered by AA batteries, transmitting data intermittently and sleeping between cycles. IC Role / Device Role / Timing Role: Reset generator and supply monitor that asserts RESET during startup and triggers PFO interrupt on supply sag. Use Value: 75µA quiescent current extends battery life; 200ms RESET pulse guarantees full µP boot sequence completion. |
| Intelligent Test Equipment | Set-Top Box Power Management |
Use Scenario: Handheld multimeter with µP-based ADC, display, and calibration memory requiring deterministic power sequencing. IC Role / Device Role / Timing Role: Dual-output reset supervisor (active-low and active-high RESET) interfacing with both µP and FPGA logic. Use Value: Eliminates need for external inverters; ±1% threshold ensures repeatable calibration under varying line conditions. |
Use Scenario: Consumer STB with 3.3V core rail and 5V I/O rail, requiring coordinated reset and early warning of AC adapter failure. IC Role / Device Role / Timing Role: Primary 3.3V supervisor with PFI connected to scaled-down 5V rail to detect upstream supply collapse. Use Value: PFO interrupt initiates graceful firmware shutdown before 3.3V rail collapses; 1.70V PFI reference enables accurate scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX816TESA+ | Adjustable reset threshold via external resistor divider (RESET IN pin); no LOW LINE output; active-low RESET only. | Suitable when system requires custom reset voltage (e.g., 2.85V) or shares reset control with external reference; not suitable for low-line warning. | Select MAX816TESA+ only if adjustable trip point is required and LOW LINE functionality is unnecessary. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (±0.5%); no low-line output; no power-fail comparator; 1.8µA typical IQ; push-pull RESET. | Better for ultra-low-power applications where PFI/PFO and early warning are omitted; lacks dual reset outputs and brownout hysteresis. | Choose TPS3808G33DBVR when minimal quiescent current is critical and power-fail monitoring is handled elsewhere. |
Compared with MAX814TESA+, MAX816TESA+ trades fixed-threshold precision and low-line warning for design flexibility in reset voltage, while TPS3808G33DBVR sacrifices supervision features for ultra-low IQ - making MAX814TESA+ optimal for balanced 3V systems needing full-feature reset, warning, and fail-detection capability.
Availability
MAX814TESA+ is available at Aetrix Electronics and suitable for medical portable monitors, battery-powered controllers, intelligent test equipment, and set-top box power management requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX814TESA+ 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 low-power operation.
The MAX814/MAX815/MAX816 family was engineered specifically for high-accuracy µP supervision in portable and critical systems, delivering ±1% reset thresholds, sub-100µA supply current, and robust glitch immunity without external components.
FAQ
What is the exact reset threshold voltage of the MAX814TESA+?
The MAX814TESA+ has a factory-trimmed reset threshold of 3.03V ±1% (2.9997V to 3.0603V) over temperature and supply range. This value is fixed and corresponds to the 'T' suffix in the part number. It is specified for operation with 3.3V nominal supplies and guarantees reliable reset assertion before the µP's minimum operating voltage is violated. The MAX814TESA+ datasheet confirms this threshold applies across the full commercial temperature range (0°C to +70°C).
Does the MAX814TESA+ include a watchdog timer function?
No, the MAX814TESA+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX815 variant (e.g., MAX815TESA+), which adds WDI and WDO pins and a 1.56s timeout. The MAX814TESA+ provides only reset generation, manual reset input, power-fail monitoring (PFI/PFO), and low-line detection (LOW LINE). Its block diagram and pinout confirm absence of watchdog-related terminals.
What is the purpose of the LOW LINE pin on the MAX814TESA+?
The LOW LINE pin on the MAX814TESA+ 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 early warning of supply degradation before reset occurs, allowing the µP to execute shutdown routines. Unlike RESET, LOW LINE has no minimum pulse width and returns high immediately when VCC recovers - enabling precise timing-critical interrupt handling in portable systems.
Can the MAX814TESA+ monitor voltages other than VCC?
Yes, the MAX814TESA+ can monitor external voltages using its PFI pin. By connecting a resistor divider from the target voltage to PFI (and GND), the input is compared to the internal 1.70V reference. For example, to monitor a 12V rail, a 6.07:1 divider yields 1.70V at PFI when the rail is at 10.32V - triggering PFO when voltage drops below that point. The MAX814TESA+ datasheet explicitly validates this method for both positive and negative rails.
What package type and lead finish does MAX814TESA+ use?
The MAX814TESA+ is supplied in an 8-pin SO (Small Outline) package with gull-wing leads and lead-free (Pb-free) finish, as indicated by the '+' suffix per Maxim's ordering convention. It meets RoHS Directive 2011/65/EU and has a moisture sensitivity level (MSL) of 1. The package dimensions are standardized per JEDEC MS-012, with 1.27mm pitch and 3.9mm body width - compatible with automated SMT assembly.
MAX814TESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.03V
- 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
MAX814TESA+ FAQ
1.How can I place an order for MAX814TESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TESA+ 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 MAX814TESA+ reliable?
The price and inventory of MAX814TESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TESA+ is usually 5 days.
3.What payment methods are accepted for MAX814TESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TESA+?
MAX814TESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TESA+ 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 MAX814TESA+?
For technical support, including MAX814TESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TESA+ requirements.
6.How does Aetrix verify that MAX814TESA+ is sourced from the original manufacturer or authorized distributors?
All MAX814TESA+ 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 MAX814TESA+ meets industry standards.
7.What is the process for return or replacement of MAX814TESA+?
All MAX814TESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TESA+, 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 MAX814TESA+ part is unused and in its original packaging.
Return procedure for MAX814TESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814TESA+ Tags
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MIC826SYMT-TR
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