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Analog Devices Inc./Maxim Integrated MAX814LCSA+
- Part No.:
- MAX814LCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814LCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
MAX814LCSA+ 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 a 4.70V ±1% reset threshold, 200ms reset pulse width, active-low RESET output, guaranteed valid operation 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 MAX814LCSA+ datasheet, MAX814LCSA+ pinout, MAX814LCSA+ application, or MAX814LCSA+ equivalent, this page delivers verified technical context, exact pin roles, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the L-suffix +5V variant in SO-8 package.
Technical Context
The MAX814LCSA+ implements a precision reset comparator with ±1% worst-case threshold accuracy at 4.70V, referenced to an internal bandgap and immune to fast VCC transients (e.g., ≤30µs at 100mV overdrive). Its low-line detector asserts LOW LINE when VCC falls 60mV above the reset threshold, enabling pre-reset NMI alerts.
It integrates a manual-reset input (MR) with 150µA internal pull-up and 1.10V logic threshold, and a dedicated power-fail comparator (PFI/PFO) with 2.50V reference - all operating across 0°C to +70°C with supply voltage range 4.75V to 5.5V. No watchdog or adjustable reset functionality is present - distinguishing it from MAX815/MAX816 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures deterministic reset initiation in +5V systems with ±5% supply tolerance, meeting worst-case IC operating voltage requirements. |
| Reset Pulse Width | 200ms minimum - guarantees µP reset hold time sufficient for full initialization after power-up or brownout recovery. |
| Supply Current | 75µA max - enables integration into battery-powered portable equipment without compromising runtime. |
| VCC Operating Range | 4.75V to 5.5V - supports stable operation across full industrial-grade +5V rail variation, including cold-start conditions. |
| RESET Output Type | Active-low open-drain - compatible with standard µP reset inputs; sinks ≥3.2mA at VCC = 5V, VOH = VCC −1.5V. |
| Low-Line Detection | 60mV above reset threshold - provides early warning (LOW LINE) before reset assertion, allowing µP to execute shutdown routines. |
| Power-Fail Reference | 2.50V on PFI - enables configurable undervoltage monitoring of auxiliary rails (e.g., +12V via resistor divider) with PFO interrupt output. |
Pinout & Package
MAX814LCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix), with 1.27mm pitch and JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input; triggers reset when pulled below 1.10V; internal 150µA pull-up to VCC eliminates external resistor need. |
| 2 VCC | Positive Power Supply | +5V supply input; reset asserted while VCC < 4.70V; RESET remains valid down to VCC = 1V. |
| 3 GND | Ground Reference | System ground return for all internal comparators and outputs; must be low-impedance for noise immunity. |
| 4 PFI | Power-Fail Input | Analog input referenced to 2.50V; monitors external voltage dividers for early power-fail detection; high-impedance (≤35nA leakage). |
| 5 PFO | Power-Fail Output | Open-drain output; pulls low when PFI < 2.50V; sources ≥300µA or sinks ≥1.2mA - drives µP interrupts or resets via external pull-up. |
| 6 LOW LINE | Low-Line Warning Output | Open-drain output; asserts low when VCC drops 60mV above 4.70V reset point - enables pre-reset NMI signaling. |
| 7 RESET | Reset Output | Active-low open-drain; guaranteed logic low (≤0.4V) during reset; holds for ≥200ms after VCC rises above threshold. |
| 8 RESET | Active-High Reset Output | Inverted copy of pin 7; logic high during reset - directly interfaces with µPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates manual trimming and ensures deterministic reset timing across temperature, voltage, and process variations in critical +5V applications. |
| Guaranteed RESET Valid to VCC = 1V | Ensures clean, known reset state during deep brownout - prevents µP latch-up or undefined behavior as supply collapses. |
| Power-Supply Glitch Immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - avoids spurious resets in electrically noisy environments. |
| Integrated Low-Line Detector | Provides 60mV hysteresis-based early warning (LOW LINE) before reset - enables µP to save data and prepare for orderly shutdown. |
| 2.50V Power-Fail Comparator | Allows independent monitoring of auxiliary supplies (e.g., +12V) via resistive divider on PFI - PFO delivers interrupt-capable fault signal. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and brownout protection in handheld diagnostic devices with Li-ion batteries and dual-rail (3.3V/5V) logic. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during battery sag or charger disconnect; LOW LINE triggers NMI for EEPROM save before reset. Use Value: Prevents data corruption and ensures safe shutdown within 200ms, leveraging 75µA quiescent current to extend battery life. |
Use Scenario: Reliable startup and fault response in ruggedized field meters exposed to thermal cycling and supply instability. IC Role / Device Role / Timing Role: Monitors main +5V rail; asserts RESET on undervoltage and LOW LINE on pre-brownout; PFI tracks backup supply health. Use Value: Enables deterministic boot and graceful degradation - no software intervention needed for power integrity assurance. |
| Intelligent Instruments | Critical µP Power Monitoring |
Use Scenario: Embedded controller in programmable logic analyzers requiring precise reset coordination across FPGA, ADC, and µP subsystems. IC Role / Device Role / Timing Role: Synchronizes power-on reset across multiple voltage domains using RESET and active-high RESET outputs. Use Value: Eliminates race conditions during power-up; ±1% threshold accuracy ensures consistent timing across production units. |
Use Scenario: Redundant power supervision in industrial PLC backplanes where failure of primary 5V rail must trigger immediate failover. IC Role / Device Role / Timing Role: Primary supervisor detecting VCC collapse; PFO output drives secondary supervisor enable or relay control logic. Use Value: Provides hardware-level fault isolation - independent of firmware - with sub-100µs response to supply faults. |
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 electrical specs and pinout, but leaded (non-RoHS) packaging; lacks + suffix indicating lead-free compliance. | Not suitable for RoHS-compliant production; identical function in legacy or non-regulated designs. | Select MAX814LCSA+ for new designs requiring lead-free compliance and traceable sourcing. |
| TPS3808G18DBVR | 4.75V reset threshold (±0.5%), 360ms delay, 2.5µA IQ, SOT-23-6 package - smaller size, lower current, but no LOW LINE or dual RESET outputs. | Lacks low-line warning and active-high reset output; requires external components for PFI-like monitoring. | Choose only if ultra-low quiescent current and PCB space savings outweigh loss of dual reset polarity and early-warning capability. |
Compared with MAX814LCSA+, the leaded MAX814LCSA offers identical supervision but fails RoHS compliance, while TPS3808G18DBVR trades feature richness (LOW LINE, dual RESET, PFI/PFO) for ultra-low IQ and compactness - making it unsuitable as a drop-in replacement.
Availability
MAX814LCSA+ is available at Aetrix Electronics and suitable for medical equipment, portable instrumentation, intelligent controllers, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX814LCSA+ 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 MAX814LCSA+ belongs to Maxim's µP supervisory product line, designed specifically to replace discrete reset circuits in +5V systems with guaranteed accuracy, low power, and integrated fault-detection features like LOW LINE and PFI/PFO.
FAQ
What is the exact reset threshold voltage of the MAX814LCSA+?
The MAX814LCSA+ has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy across temperature and supply variation. This value is fixed by the 'L' suffix and applies to VCC rising and falling edges per Maxim's Electrical Characteristics table for +5V parts. The threshold remains stable over 0°C to +70°C and 4.75V–5.5V VCC range, ensuring predictable reset behavior in +5V systems.
Does the MAX814LCSA+ include a watchdog timer?
No, the MAX814LCSA+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX815 family (e.g., MAX815LCSA+). The MAX814LCSA+ provides only power-on reset, manual reset (MR), low-line detection (LOW LINE), and power-fail monitoring (PFI/PFO). Its block diagram confirms absence of WDI/WDO circuitry - confirming it is a pure supervisory device without timeout-based system supervision.
Can the MAX814LCSA+ monitor voltages other than VCC?
Yes, the MAX814LCSA+ can monitor auxiliary voltages using its PFI input. By connecting a resistor divider to PFI, any DC voltage (e.g., +12V or −5V) can be scaled to match the 2.50V internal reference. When PFI falls below 2.50V, PFO asserts low - enabling interrupt-driven response. Figure 11 in the datasheet shows +12V monitoring; Figure 12 demonstrates negative rail monitoring with external transistor logic.
What is the purpose of the LOW LINE output on the MAX814LCSA+?
The LOW LINE output on the MAX814LCSA+ is a dedicated early-warning signal that goes low when VCC drops 60mV above the 4.70V reset threshold (i.e., at ~4.76V). It provides a pre-reset alert to the µP - typically routed to an NMI pin - allowing time to save volatile data or initiate controlled shutdown before RESET asserts. This feature is absent in MAX815/MAX816 and unique to the MAX814 variant.
Is the MAX814LCSA+ pin-compatible with other MAX814 variants like MAX814K or MAX814T?
Yes, all MAX814 variants (K, L, N, T suffixes) share identical 8-pin SO/DIP pinouts and core functionality - differing only in reset threshold voltage and operating voltage range. MAX814LCSA+ (4.70V) is pin-compatible with MAX814KCSA+ (4.80V) and MAX814TCSA+ (3.03V), but system-level validation is required since threshold mismatch may cause premature or delayed reset assertion in target applications.
MAX814LCSA+ 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:
- 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+ FAQ
1.How can I place an order for MAX814LCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LCSA+ 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+ reliable?
The price and inventory of MAX814LCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LCSA+ is usually 5 days.
3.What payment methods are accepted for MAX814LCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LCSA+?
MAX814LCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LCSA+ 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+?
For technical support, including MAX814LCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LCSA+ requirements.
6.How does Aetrix verify that MAX814LCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX814LCSA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX814LCSA+?
All MAX814LCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LCSA+, 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+ part is unused and in its original packaging.
Return procedure for MAX814LCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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