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Analog Devices Inc./Maxim Integrated MAX814TESA+T
- Part No.:
- MAX814TESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814TESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,699
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Product details
Overview
MAX814TESA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with active-low RESET output, 3.03V fixed reset threshold, 200ms reset timeout, and power-fail monitoring capability - designed for reliable power-on reset and brownout protection in 3.3V portable and medical systems.
For engineers reviewing the MAX814TESA+T datasheet, MAX814TESA+T pinout, MAX814TESA+T application, or MAX814TESA+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed reset timing and voltage thresholds, and real-world design implications for battery-powered µP systems requiring guaranteed reset assertion down to VCC = 1V.
Technical Context
The MAX814TESA+T implements a precision reset comparator referenced to a factory-trimmed 3.03V threshold (±1% worst-case), with hysteresis-free detection and guaranteed valid RESET output down to VCC = 1V. Its internal 150µA MR pull-up enables direct switch-to-GND manual reset without external components.
It integrates a dedicated power-fail comparator (PFI threshold = 1.70V) driving open-drain PFO, and a LOW LINE output asserting 60mV above the reset threshold - both fully decoupled from the reset generator and operational across the full 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - ensures deterministic reset initiation at 3.3V system brownout onset, independent of temperature or load variation. |
| Reset Timeout | 200ms minimum - guarantees µP remains held in reset long enough for stable clock and supply settling after power-up. |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered medical monitors and portable instrumentation. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and allows use with 3.3V, 2.5V, or 1.8V logic domains via level-shifting. |
| RESET Output Type | Active-low open-drain - permits wired-OR configuration with other reset sources and compatibility with µP reset inputs requiring pull-up. |
| Power-Fail Threshold | 1.70V on PFI - enables early warning of 3.3V rail collapse by setting external divider to trigger ~100mV before reset threshold. |
| LOW LINE Offset | 60mV above reset threshold - provides 200µs advance warning before RESET assertion, sufficient for NMI-triggered data save routines. |
Pinout & Package
MAX814TESA+T is housed in an 8-pin SO package (SOIC-8, 150mil width), RoHS-compliant and lead-free per +T suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pull-up to VCC; asserts RESET when pulled below 1.10V; no external pull-up required. |
| 2 VCC | Positive Supply Input | Primary power rail input; RESET is asserted while VCC < 3.03V and remains valid down to 1.0V - critical for low-voltage brownout detection. |
| 3 GND | Ground Reference | Common return path for all internal comparators and outputs; must be low-impedance to ensure accurate threshold referencing. |
| 4 PFI | Power-Fail Input | Analog input referenced to 1.70V internal comparator; used with external resistor divider to monitor auxiliary rails (e.g., 12V, -5V) or backup batteries. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 1.70V; connects directly to µP interrupt pin for early power-fail notification. |
| 6 LOW LINE | Low-Line Warning Output | Open-drain output asserting when VCC falls to 3.09V (3.03V + 60mV); provides non-reset interrupt for orderly shutdown prior to system lockup. |
| 7 RESET | Reset Output | Active-low open-drain output; guaranteed logic low ≤0.4V at ISINK = 3.2mA; requires external pull-up to host VCC domain. |
| 8 RESET | Complementary Reset Output | Active-high output (inverse of pin 7); eliminates need for external inverter in systems requiring high-asserted reset signals. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual calibration and ensures first-time-right reset behavior across temperature (-40°C to +85°C) and supply variations. |
| Guaranteed RESET validity to VCC = 1V | Enables robust brownout recovery in ultra-low-power systems where supply may sag below 1.8V during peak current transients. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets caused by switching noise or ESD coupling. |
| Independent LOW LINE detector | Provides deterministic 60mV advance warning before reset assertion, enabling µP to execute critical save routines without watchdog dependency. |
| 150µA internal MR pull-up | Reduces BOM count by eliminating external pull-up resistor; supports direct connection to tactile switches or open-drain logic outputs. |
Applications
| Medical Patient Monitor | Portable ECG Device |
|---|---|
Use Scenario: Battery-powered bedside monitor continuously sampling analog biosignals and storing data to flash memory. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET during Li-ion battery voltage sag below 3.03V and triggers LOW LINE interrupt 60mV earlier to initiate flash write completion. Use Value: Prevents data corruption by ensuring µP completes critical storage before entering reset, leveraging guaranteed 1V operation during final battery discharge. |
Use Scenario: Handheld ECG unit operating from single AA cell with boost converter regulating 3.3V rail. IC Role / Device Role / Timing Role: Monitors boosted 3.3V rail via VCC pin and auxiliary 5V reference rail via PFI divider to detect dual-rail failure modes. Use Value: Dual-threshold detection enables differentiated response: PFO interrupt for graceful shutdown on 5V rail loss, RESET assertion only on main 3.3V collapse. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller module with isolated CAN interface and EEPROM-based configuration storage. IC Role / Device Role / Timing Role: Generates 200ms power-on reset pulse synchronized to 3.3V rail stabilization, while using MR pin for field-service firmware recovery via front-panel button. Use Value: Eliminates need for RC-based reset timers and external debouncing circuitry - reduces PCB area and improves MTBF. |
Use Scenario: Consumer STB with multiple power domains (3.3V SoC, 1.2V core, 5V USB) and fast wake-from-standby requirement. IC Role / Device Role / Timing Role: Uses RESET output to hold SoC in reset until 3.3V rail reaches regulation; LOW LINE output signals standby controller to precharge auxiliary rails. Use Value: Enables sub-500ms wake time by decoupling rail sequencing from µP boot code execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Single 3.00V reset threshold, no LOW LINE or PFI/PFO; 140ms reset timeout; 25µA supply current. | Lacks early-warning capability and auxiliary rail monitoring; suitable only for basic reset-only functions in ultra-low-power designs. | Select when cost and quiescent current are primary concerns and advanced supervision features are unnecessary. |
| TPS3808G30DBVR | 3.00V threshold, 200ms timeout, but no LOW LINE output; includes watchdog timer; 1.6µA typical supply current. | Offers watchdog functionality absent in MAX814TESA+T, but omits low-line warning - trade-off between supervision breadth and ultra-low IQ. | Choose when system-level software reliability requires watchdog enforcement, and early brownout warning is handled elsewhere. |
Compared with MAX809SEUR+T and TPS3808G30DBVR, the MAX814TESA+T uniquely combines ±1% reset accuracy, dedicated LOW LINE warning, and dual-rail power-fail monitoring in a single SOIC-8 package - making it optimal for safety-critical portable systems where layered power integrity assurance is mandatory.
Availability
MAX814TESA+T is available at Aetrix Electronics and suitable for medical patient monitors, portable ECG devices, industrial PLC I/O modules, and set-top box power management systems requiring stable component supply across extended product lifecycles.
Supply support for MAX814TESA+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 solutions for industrial, medical, and communications applications.
The MAX814 family was engineered specifically for high-reliability microprocessor supervision in battery-constrained and safety-critical environments, emphasizing ±1% threshold accuracy, ultra-low supply current, and multi-layer power-fail detection.
FAQ
What is the exact reset threshold voltage of the MAX814TESA+T?
The MAX814TESA+T has a factory-trimmed reset threshold of 3.03V with ±1% worst-case accuracy across temperature and supply voltage. This value is fixed and corresponds to the "T" suffix in the part number, optimized for 3.3V systems with tight tolerance requirements. The threshold remains stable over -40°C to +85°C and is validated down to VCC = 1V.
Does the MAX814TESA+T provide both active-low and active-high reset outputs?
Yes, the MAX814TESA+T provides two independent reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET (complementary). Both are valid simultaneously and share the same 200ms timeout timing. This eliminates the need for external inverters in systems requiring either polarity, simplifying interface design with diverse µP families.
Can the MAX814TESA+T monitor voltages other than VCC?
Yes, the MAX814TESA+T can monitor auxiliary rails using the PFI pin. With its 1.70V internal reference, an external resistor divider on PFI enables precise monitoring of higher voltages (e.g., 12V) or negative supplies. When PFI drops below 1.70V, PFO asserts - allowing the device to serve as a flexible undervoltage detector beyond the primary VCC rail.
What is the function of the LOW LINE output on the MAX814TESA+T?
The LOW LINE output on the MAX814TESA+T is an open-drain signal that asserts when VCC falls to 60mV above the 3.03V reset threshold (i.e., at 3.09V). It provides a deterministic early warning - typically 200µs before RESET assertion - enabling the µP to execute critical save routines or disable peripherals before full reset occurs.
Is manual reset supported on the MAX814TESA+T, and how is it implemented?
Yes, the MAX814TESA+T supports manual reset via pin 1 (MR), an active-low input with a built-in 150µA pull-up to VCC. Pulling MR below 1.10V asserts RESET immediately and holds it low for 200ms after MR returns high. This allows direct connection to momentary switches without external components, and supports remote reset via GPIO or logic signals.
MAX814TESA+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:
- 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+T FAQ
1.How can I place an order for MAX814TESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TESA+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 MAX814TESA+T reliable?
The price and inventory of MAX814TESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TESA+T is usually 5 days.
3.What payment methods are accepted for MAX814TESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TESA+T?
MAX814TESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TESA+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 MAX814TESA+T?
For technical support, including MAX814TESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TESA+T requirements.
6.How does Aetrix verify that MAX814TESA+T is sourced from the original manufacturer or authorized distributors?
All MAX814TESA+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 MAX814TESA+T meets industry standards.
7.What is the process for return or replacement of MAX814TESA+T?
All MAX814TESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TESA+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 MAX814TESA+T part is unused and in its original packaging.
Return procedure for MAX814TESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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