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Analog Devices Inc./Maxim Integrated MAX814KESA+T
- Part No.:
- MAX814KESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814KESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,612
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Product details
Overview
MAX814KESA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with fixed 4.8V reset threshold, active-low and active-high RESET outputs, manual reset input (MR), power-fail monitor (PFI/PFO), and low-line detection. It guarantees valid RESET down to VCC = 1V, features 200ms reset timeout, and draws only 75µA supply current - ideal for battery-powered medical instruments and portable controllers requiring reliable brownout protection.
For engineers reviewing the MAX814KESA+T datasheet, MAX814KESA+T pinout, MAX814KESA+T application, or MAX814KESA+T equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior (e.g., 200ms tRS, 60mV low-line offset), and validated alternatives for +5V µP monitoring in critical embedded systems.
Technical Context
The MAX814KESA+T implements dual-reset output logic (RESET active-low, RESET active-high) driven by a precision voltage comparator monitoring VCC against a factory-trimmed 4.80V ±1% threshold. Its low-line detector triggers 60mV above that threshold with 2mV hysteresis, enabling early brownout warning before full reset assertion.
It integrates a manual reset input (MR) with 150µA internal pull-up and 1.10V logic threshold, plus independent PFI/PFO circuitry referenced to 2.50V - all operating reliably across 0°C to +70°C with guaranteed functionality down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures deterministic reset initiation in 5V systems with ±4% supply tolerance. |
| Reset Pulse Width | 200ms minimum - provides sufficient hold time for µP initialization after power-up or brownout recovery. |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET validity during deep brownout, down to 1V before open-circuit behavior. |
| Low-Line Offset | 60mV above reset threshold - delivers early warning for controlled shutdown before system reset occurs. |
| PFI Reference Voltage | 2.50V - supports early power-fail detection on +5V rails via external resistive divider. |
| MR Input Threshold | 1.10V - compatible with TTL/CMOS logic and mechanical switches without external biasing. |
Pinout & Package
MAX814KESA+T is housed in an 8-pin SO package (SOIC-8, 150 mil width), RoHS-compliant and lead-free (+T suffix). Pin functions are electrically isolated per internal block diagram and validated across temperature range 0°C to +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low trigger with 150µA internal pull-up; asserts both RESET outputs when pulled below 1.10V. |
| 2 VCC | Positive Power Supply | Primary supply input; reset comparator monitors this rail; valid operation from 1.0V to 5.5V. |
| 3 GND | Ground Reference | Common return path for all analog comparators and digital outputs; required for accurate threshold tracking. |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; comparator trips at 2.50V to initiate PFO assertion before VCC collapse. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA at 2.50V trip; used to interrupt µP for orderly shutdown. |
| 6 LOW LINE | Low-Line Warning Output | Active-low signal triggered when VCC falls 60mV above 4.80V reset point; enables NMI-based pre-reset response. |
| 7 RESET | Active-Low Reset Output | Guaranteed logic-low (≤0.4V) during reset; holds µP in known state until 200ms after VCC exceeds 4.80V. |
| 8 RESET | Active-High Reset Output | Inverse of pin 7; high during normal operation, low during reset - eliminates need for external inverter. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures first-pass reliability in production across temperature and supply variation. |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP behavior during deep brownout by maintaining asserted reset state until supply collapses fully. |
| Power-supply glitch immunity | Rejects transients ≤30µs wide at 100mV overdrive - avoids spurious resets in noisy industrial environments. |
| Dual RESET outputs (active-low + active-high) | Direct interface to µPs requiring either polarity without external logic, reducing BOM count and layout complexity. |
| Low-line detector with 60mV offset | Provides deterministic early-warning window for firmware-controlled data save and safe state transition prior to reset. |
Applications
| Medical Instrumentation | Portable Diagnostic Controller |
|---|---|
Use Scenario: Battery-powered handheld ECG analyzer operating from single Li-ion cell with buck-boost regulator. IC Role / Device Role / Timing Role: Monitors regulated 5V rail for brownout; asserts LOW LINE at 4.86V to trigger firmware-initiated flash save before RESET at 4.80V. Use Value: Enables full waveform buffer preservation during partial battery depletion, meeting IEC 62304 safety requirements. |
Use Scenario: Field-deployable glucose meter with auto-shutdown and calibration memory retention. IC Role / Device Role / Timing Role: Provides 200ms reset pulse on power-up and detects 5V rail collapse; uses PFO to interrupt µP for EEPROM write completion. Use Value: Guarantees nonvolatile memory integrity during unexpected power loss, eliminating calibration drift after battery replacement. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted analog input module powered from 24VDC supply with local 5V LDO. IC Role / Device Role / Timing Role: Supervises 5V logic rail; MR pin connected to front-panel reset button; LOW LINE feeds FPGA NMI for graceful I/O freeze. Use Value: Prevents metastability in ADC sampling chain during undervoltage events, ensuring deterministic fault reporting. |
Use Scenario: Consumer STB with dual-rail (5V/3.3V) power and HDMI hot-plug detection logic. IC Role / Device Role / Timing Role: Uses PFI to monitor 5V standby rail; PFO triggers SoC wake-up interrupt when main power fails. Use Value: Enables zero-power HDMI CEC responsiveness during AC dropout, maintaining remote control availability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+T | 4.70V ±1% reset threshold; 100mV lower trip point than MAX814KESA+T. | Better suited for 5V ±5% supplies where full rail utilization is required before reset. | Select when system must operate down to 4.65V min while retaining ±1% accuracy and same pinout. |
| TPS3808G18DBVR | 1.8V fixed reset threshold; no low-line or dual RESET outputs; 350ms default timeout. | Designed for low-voltage ASICs, not 5V µP systems; lacks PFI/PFO and early-warning capability. | Use only if replacing legacy MAX814K in new 1.8V designs - not drop-in compatible for 5V applications. |
Compared with MAX814LESA+T, the MAX814KESA+T offers tighter margin for 5V ±4% supplies; compared with TPS3808G18DBVR, it delivers full feature parity (dual RESET, LOW LINE, PFI/PFO) essential for legacy µP supervision but requires 4.8V rail monitoring instead of 1.8V.
Availability
MAX814KESA+T is available at Aetrix Electronics and suitable for medical instrumentation, portable diagnostic controllers, industrial PLC I/O modules, and set-top box power management requiring stable component supply across extended product lifecycles.
Supply support for MAX814KESA+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-precision analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX814 family was designed specifically for robust microprocessor supervision in mission-critical embedded systems - delivering ±1% reset accuracy, ultra-low quiescent current, and multiple fault-detection outputs in compact SO packages.
FAQ
What is the exact reset threshold voltage of the MAX814KESA+T?
The MAX814KESA+T has a factory-trimmed reset threshold of 4.80V with ±1% worst-case accuracy across temperature and supply variation. This value is confirmed in the Electrical Characteristics table for +5V parts (MAX814K/MAX815K) and applies directly to the K-suffix variant. The threshold remains stable over 0°C to +70°C and supports 5V systems with ±4% supply tolerance.
Does the MAX814KESA+T provide both active-low and active-high reset outputs?
Yes, the MAX814KESA+T provides two independent reset outputs: pin 7 (RESET) is active-low, and pin 8 (RESET) is active-high - the logical inverse. Both outputs are guaranteed to be in the correct state for VCC down to 1V, and both assert synchronously during power-up, brownout, or manual reset events.
How does the LOW LINE output function in the MAX814KESA+T?
The LOW LINE output on pin 6 of the MAX814KESA+T is an active-low warning signal triggered when VCC falls to 60mV above the 4.80V reset threshold (i.e., at 4.86V). It provides early brownout indication with 2mV hysteresis, enabling firmware to execute controlled shutdown before the main RESET activates at 4.80V.
Can the MAX814KESA+T monitor voltages other than VCC?
Yes - the PFI pin (pin 4) accepts an externally derived voltage, such as from a resistor divider on a +12V rail or negative supply. When PFI drops below its 2.50V internal reference, PFO (pin 5) asserts to signal impending failure. This allows the MAX814KESA+T to supervise auxiliary rails independently of VCC.
What is the maximum supply current consumption of the MAX814KESA+T?
The MAX814KESA+T consumes a maximum of 75µA supply current across temperature and supply voltage (1.0V to 5.5V), as specified in the Electrical Characteristics table. This ultra-low quiescent current makes it suitable for long-life battery-powered applications like portable medical devices and handheld test equipment.
MAX814KESA+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:
- 4.8V
- 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
MAX814KESA+T FAQ
1.How can I place an order for MAX814KESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814KESA+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 MAX814KESA+T reliable?
The price and inventory of MAX814KESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814KESA+T is usually 5 days.
3.What payment methods are accepted for MAX814KESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814KESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814KESA+T?
MAX814KESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814KESA+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 MAX814KESA+T?
For technical support, including MAX814KESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814KESA+T requirements.
6.How does Aetrix verify that MAX814KESA+T is sourced from the original manufacturer or authorized distributors?
All MAX814KESA+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 MAX814KESA+T meets industry standards.
7.What is the process for return or replacement of MAX814KESA+T?
All MAX814KESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814KESA+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 MAX814KESA+T part is unused and in its original packaging.
Return procedure for MAX814KESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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