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Analog Devices Inc./Maxim Integrated MAX814LCSA+T
- Part No.:
- MAX814LCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814LCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,424
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Product details
Overview
MAX814LCSA+T from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with fixed 4.70V reset threshold, active-low RESET output, manual reset input (MR), power-fail monitor (PFI/PFO), and low-line detection. It guarantees valid RESET down to VCC = 1V and delivers 200ms reset pulse width for reliable µP initialization in 5V systems. Used in medical equipment and portable battery-powered devices requiring precise brownout protection.
For engineers reviewing the MAX814LCSA+T datasheet, MAX814LCSA+T pinout, MAX814LCSA+T application, or MAX814LCSA+T equivalent, key selection criteria include reset threshold accuracy (±1%), supply current (75µA max), guaranteed RESET validity to 1V, 200ms timeout, and compatibility with 5V ±5% power supplies in commercial-temperature industrial control and instrumentation.
Technical Context
The MAX814LCSA+T implements a precision voltage comparator with 4.70V ±1% trip point referenced to VCC, independent low-line detector set 60mV above reset threshold (hysteresis 2mV), and power-fail comparator with 2.50V reference. Its MR input features internal 150µA pullup and accepts TTL/CMOS logic levels.
RESET assertion is synchronized to VCC crossing the threshold, with minimum 140ms pulse width after release and guaranteed low-state operation down to VCC = 1V. The device ignores transients ≤30µs at 100mV overdrive, providing robust immunity to supply glitches in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reliable reset initiation across temperature and supply tolerance in 5V ±5% systems |
| Supply Current | 75µA max - enables use in battery-powered portable equipment with multi-year runtime |
| Reset Pulse Width | 200ms typ - meets µP minimum reset hold-time requirements for safe boot initialization |
| VCC Operating Range | 4.75V to 5.5V - supports full 5V system rail with margin for ripple and load regulation |
| RESET Valid Down To | VCC = 1V - guarantees known reset state during deep brownout or controlled power-down |
| Low-Line Threshold | 60mV above reset threshold - provides early warning of impending reset for orderly shutdown |
| Power-Fail Reference | 2.50V - enables monitoring of +12V or other rails via resistive divider with predictable trip point |
Pinout & Package
MAX814LCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and gull-wing leads suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS-compatible input with internal 150µA pullup; triggers reset when pulled below 1.10V |
| 2 VCC | Positive Supply Input | Primary power rail connection; reset asserted when VCC falls below 4.70V ±1% |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs |
| 4 PFI | Power-Fail Input | High-impedance input referenced to 2.50V; used to monitor auxiliary supplies via external divider |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V; signals early power degradation |
| 6 LOW LINE | Low-Line Detector Output | Active-low open-drain output asserting when VCC drops 60mV above reset threshold |
| 7 RESET | Reset Output | Active-low push-pull output guaranteed low ≤0.4V at ISINK = 3.2mA; valid to VCC = 1V |
| 8 RESET | Reset Output (Active-High) | Inverted copy of pin 7; high when pin 7 is low - supports µP reset inputs requiring active-high 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 | Prevents undefined µP state during deep brownout, enabling controlled firmware shutdown before power collapse |
| Low-line detector with 60mV offset | Provides 200–300µs advance warning before reset assertion, allowing time-critical data save operations |
| Power-fail comparator with 2.50V reference | Enables monitoring of non-VCC rails (e.g., +12V) using simple resistor dividers without external references |
| 75µA max supply current | Reduces quiescent power in always-on subsystems, extending battery life in portable medical and instrumentation devices |
Applications
| Medical Equipment Power Monitoring | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Continuous monitoring of 5V main supply in portable ultrasound or patient monitors during battery discharge cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET and LOW LINE to trigger firmware-initiated data preservation before critical voltage collapse. Use Value: Prevents data corruption by guaranteeing µP reset at precisely 4.70V ±1%, with 200ms hold time and early low-line warning at 4.76V. | Use Scenario: Embedded PLC controller operating from unregulated 5V rail subject to motor-induced transients and line sags. IC Role / Device Role / Timing Role: Voltage supervisor rejecting ≤30µs supply glitches while asserting RESET on sustained brownouts below 4.70V. Use Value: Maintains system reliability with ±1% threshold accuracy and glitch immunity, eliminating spurious resets in electrically noisy factory environments. |
| Intelligent Instrumentation | Set-Top Box Power Sequencing |
Use Scenario: Precision multimeter or spectrum analyzer requiring deterministic boot sequence and fault-safe shutdown on AC adapter disconnect. IC Role / Device Role / Timing Role: Dual-output supervisor providing both active-low and active-high RESET signals to interface with mixed-logic µP and FPGA domains. Use Value: Enables clean power-up coordination and avoids race conditions via guaranteed 200ms reset pulse and simultaneous dual-reset assertion. | Use Scenario: Consumer STB with multiple voltage rails (+5V, +3.3V, +12V) where early power-fail detection prevents filesystem corruption during grid instability. IC Role / Device Role / Timing Role: Power-fail monitor using PFI/PFO to detect +12V sag before +5V collapse, triggering graceful OS shutdown via µP interrupt. Use Value: Leverages 2.50V PFI reference and 1.2mA sink capability to drive NMI interrupt reliably, even under marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LCSA+ | Same 4.70V reset threshold, identical pinout and specs, but leaded (non-RoHS) packaging | Legacy designs requiring tin-lead solder compatibility or exemption from RoHS compliance | Select MAX814LCSA+ only if leaded assembly is mandated; otherwise MAX814LCSA+T is preferred for RoHS compliance |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 3.0V to 6.0V operating range, 1.8µA quiescent current, no low-line output | Ultra-low-power 3.3V systems where early brownout warning is not required | Choose TPS3808G33DBVR only for 3.3V applications needing sub-2µA supply current; MAX814LCSA+T remains optimal for 5V ±5% systems requiring low-line detection |
Compared with MAX814LCSA+, the MAX814LCSA+ offers identical supervision functionality but lacks RoHS compliance; compared with TPS3808G33DBVR, it provides higher reset accuracy (±1% vs ±2%), dedicated low-line warning, and 5V-system optimization - making it superior for medical and industrial 5V applications demanding deterministic timing and early fault signaling.
Availability
MAX814LCSA+T is available at Aetrix Electronics and suitable for medical equipment, industrial controllers, intelligent instrumentation, and set-top boxes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX814LCSA+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) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing high accuracy, low power, and robust performance.
The MAX814 family targets microprocessor supervisory functions in 5V systems, delivering ±1% reset accuracy, glitch-immune operation, and integrated low-line/power-fail monitoring for mission-critical embedded control.
FAQ
What is the exact reset threshold voltage of the MAX814LCSA+T?
The MAX814LCSA+T has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy across temperature and supply variations. This value is confirmed in the Electrical Characteristics table for +5V parts (MAX814L) and corresponds to the "L" suffix in the part number. It ensures reliable reset initiation in 5V ±5% systems while maintaining sufficient guard band against false triggering.
Does the MAX814LCSA+T support both active-low and active-high reset outputs?
Yes, the MAX814LCSA+T provides dual reset outputs: pin 7 is active-low RESET, and pin 8 is its active-high complement. Both outputs are guaranteed valid down to VCC = 1V and share the same 200ms pulse width. This allows direct interfacing with µPs or FPGAs requiring either polarity without external inverters, simplifying board design in mixed-logic systems.
How does the low-line detector in the MAX814LCSA+T function, and what is its threshold?
The MAX814LCSA+T low-line detector asserts its open-drain output (pin 6) when VCC falls to 60mV above the 4.70V reset threshold - i.e., at approximately 4.76V. It provides hysteresis of 2mV and is designed to give early warning before reset activation. This enables firmware to execute time-critical tasks like EEPROM save or status flag update before the 200ms reset pulse begins.
Can the MAX814LCSA+T monitor voltages other than VCC, such as +12V?
Yes, the MAX814LCSA+T can monitor auxiliary rails like +12V using the PFI/PFO pair. With a 2.50V internal reference, a resistor divider (e.g., 340kΩ/100kΩ) sets the trip point - for example, ~11.0V for +12V monitoring. When PFI drops below 2.50V, PFO sinks ≥1.2mA, allowing direct connection to a µP interrupt pin. This capability is documented in Figure 11 and Applications Information section.
What is the maximum supply current of the MAX814LCSA+T, and how does it impact battery life?
The MAX814LCSA+T draws a maximum of 75µA supply current across temperature and voltage ranges. In a typical portable medical device powered by a 2000mAh Li-ion battery, this contributes less than 0.004% daily drain - enabling multi-year operation in always-on monitoring modes. Its ultra-low quiescent current is explicitly cited in the Features list and verified in Typical Operating Characteristics plots.
MAX814LCSA+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:
- 4.7V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814LCSA+T FAQ
1.How can I place an order for MAX814LCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LCSA+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 MAX814LCSA+T reliable?
The price and inventory of MAX814LCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LCSA+T is usually 5 days.
3.What payment methods are accepted for MAX814LCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LCSA+T?
MAX814LCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LCSA+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 MAX814LCSA+T?
For technical support, including MAX814LCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LCSA+T requirements.
6.How does Aetrix verify that MAX814LCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX814LCSA+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 MAX814LCSA+T meets industry standards.
7.What is the process for return or replacement of MAX814LCSA+T?
All MAX814LCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LCSA+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 MAX814LCSA+T part is unused and in its original packaging.
Return procedure for MAX814LCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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