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Analog Devices Inc./Maxim Integrated MAX814LESA
- Part No.:
- MAX814LESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814LESA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:342
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Product details
Overview
MAX814LESA 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, and guaranteed valid reset assertion down to VCC = 1V. It is used in medical equipment and portable battery-powered controllers requiring reliable brownout detection and glitch immunity.
For engineers reviewing the MAX814LESA datasheet, MAX814LESA pinout, MAX814LESA application, or MAX814LESA equivalent, this device serves as a precision voltage-monitoring solution with integrated low-line detection, PFI/PFO monitoring, and robust noise rejection-critical for stable µP initialization in industrial and portable embedded designs.
Technical Context
The MAX814LESA implements a dedicated reset comparator with ±1% worst-case accuracy referenced to a factory-trimmed 4.70V threshold (L-suffix), plus an independent low-line detector set 60mV above that threshold with 2mV hysteresis. Its internal 150µA MR pull-up enables direct switch-to-GND manual reset without external components.
It integrates a power-fail comparator comparing PFI to a fixed 2.50V reference (K/L/N variants), driving open-drain PFO to signal undervoltage on auxiliary rails. All logic outputs are CMOS-compatible, and the device guarantees RESET validity over full temperature range (0°C to +70°C) and supply range (VCC = 1.0V to 5.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reliable reset initiation across temperature, line, and load variations in 5V ±5% systems. |
| Reset Pulse Width | 200ms minimum - provides sufficient time for µP core and peripherals to stabilize after power-up or brownout recovery. |
| Supply Current | 75µA max at +25°C - enables use in always-on battery-backed applications without significant drain. |
| VCC Operating Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout, down to 1V supply. |
| Low-Line Threshold | 60mV above reset threshold - delivers early warning of falling VCC before reset triggers, enabling orderly shutdown. |
| Power-Fail Reference | 2.50V - allows precise monitoring of +5V or higher rails via external resistor divider on PFI. |
| MR Input Threshold | 1.10V max low-level - compatible with TTL/CMOS logic and mechanical switches without level-shifting. |
Pinout & Package
MAX814LESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free compatible. Pin 1 is MR (Manual Reset input), Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI (Power-Fail Input), Pin 5 is PFO (Power-Fail Output), Pin 6 is LOW LINE (low-line warning output), Pin 7 is RESET (active-low reset output), and Pin 8 is RESET (active-high reset output, inverse of Pin 7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low trigger with internal 150µA pull-up; asserts RESET when pulled below 1.10V - supports momentary switch or logic control. |
| 2 - VCC | Positive Supply Input | Primary power rail input; reset comparator monitors this voltage directly; valid operation from 1.0V to 5.5V. |
| 3 - GND | Ground Reference | Common return path for all internal comparators, outputs, and bias circuits. |
| 4 - PFI | Power-Fail Input | Monitors external voltage divider; compared to 2.50V internal reference to detect auxiliary rail failure. |
| 5 - PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA when PFI < 2.50V - drives µP interrupt or external latch. |
| 6 - LOW LINE | Low-Line Warning Output | Active-low signal asserted when VCC falls 60mV above reset threshold - enables preemptive shutdown before reset. |
| 7 - RESET | Active-Low Reset Output | Guaranteed logic-low (≤0.4V) during reset; holds µP in known state until VCC stabilizes above 4.70V for 200ms. |
| 8 - RESET | Active-High Reset Output | Inverse of Pin 7; provides active-high reset signal for µPs requiring high-asserted reset input. |
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 | Enables deterministic µP behavior during deep brownout - critical for data retention and safe state capture in portable systems. |
| Integrated Low-Line Detector (60mV above VRT) | Provides 200+ µs advance warning before reset assertion, allowing µP to save registers, flush buffers, and disable peripherals. |
| Power-Supply Glitch Immunity | Rejects transients ≤30µs wide at 100mV overdrive - prevents spurious resets caused by switching noise or ESD coupling on VCC. |
| 75µA Max Supply Current | Supports multi-year battery life in always-on monitoring applications such as medical telemetry or remote sensors. |
| 8-Pin SO Package with Lead-Free Option | Enables compact PCB layout and compatibility with automated SMT assembly; + suffix denotes RoHS-compliant packaging. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Power sequencing and brownout protection in handheld diagnostic devices with Li-ion battery and dual-rail (3.3V/5V) supplies. IC Role / Device Role / Timing Role: Supervises main 5V rail; asserts RESET on VCC drop below 4.70V and triggers LOW LINE 60mV earlier to initiate EEPROM save sequence. Use Value: Prevents corrupted firmware writes during battery sag, ensuring regulatory compliance and field reliability. |
Use Scenario: Voltage monitoring in ruggedized field data loggers operating on primary alkaline cells with gradual discharge profile. IC Role / Device Role / Timing Role: Monitors declining 5V LDO output; uses PFI/PFO to warn µP of impending supply collapse before VCC crosses 4.70V reset point. Use Value: Enables graceful shutdown and timestamped last-read storage, extending usable battery life by 12–18% versus fixed-threshold alternatives. |
| Controllers | Intelligent Instruments |
Use Scenario: Reset supervision in PLC I/O modules with isolated 5V backplane supply and frequent hot-swap events. IC Role / Device Role / Timing Role: Provides glitch-immune reset generation during transient dips caused by relay switching or bus contention. Use Value: Reduces spurious reboots by >99% compared to discrete RC reset circuits, improving uptime and diagnostics traceability. |
Use Scenario: Power integrity assurance in benchtop multimeters with auto-ranging analog front-end and µP-based calibration engine. IC Role / Device Role / Timing Role: Uses MR pin for user-initiated self-test reset; leverages ±1% threshold to maintain ADC reference stability during warm-up. Use Value: Guarantees measurement repeatability across 0°C to +50°C ambient, meeting Class II metrology accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814CESA | Same 8-pin SO package and pinout; reset threshold 4.80V ±1% (K-suffix); tighter tolerance for 5V ±4% systems. | Better suited for high-reliability 5V systems where supply regulation is tighter and brownout margin must be minimized. | Select MAX814CESA when design targets worst-case 5.05V ±2% supply and requires maximum guard-band against false resets. |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 350ms delay, and 2.5µA quiescent current; no LOW LINE or PFI/PFO functions. | Lacks early warning and auxiliary rail monitoring; intended for simpler 3.3V-only applications without power-fail signaling. | Choose TPS3808G33DBVR only if system operates solely at 3.3V and does not require low-line warning or dual-rail monitoring capability. |
Compared with MAX814CESA and TPS3808G33DBVR, the MAX814LESA uniquely balances 4.70V precision reset, integrated low-line warning, and full PFI/PFO functionality in a single 8-pin SO package - making it optimal for cost-sensitive, feature-complete 5V supervisory needs where brownout predictability and auxiliary rail monitoring are required.
Availability
MAX814LESA is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, controllers, and intelligent instruments requiring stable component supply and long-term production continuity.
Supply support for MAX814LESA 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, communications, and consumer applications.
The MAX814/MAX815/MAX816 family was designed specifically for precision µP supervision in mission-critical embedded systems - delivering ±1% reset accuracy, ultra-low quiescent current, and integrated fault-warning features without external components.
FAQ
What is the exact reset threshold voltage of the MAX814LESA?
The MAX814LESA has a factory-trimmed reset threshold of 4.70V ±1% (i.e., 4.65V to 4.75V over temperature and supply). This L-suffix variant is optimized for 5V ±5% systems, ensuring reliable reset assertion while maximizing operational headroom across worst-case conditions including temperature drift, line regulation, and load variation.
Does the MAX814LESA provide both active-low and active-high reset outputs?
Yes, the MAX814LESA provides dual reset outputs: Pin 7 is active-low RESET, and Pin 8 is active-high RESET (its logical inverse). Both outputs are guaranteed valid down to VCC = 1V, and both remain synchronized - asserting or de-asserting simultaneously based on VCC crossing the 4.70V threshold or MR activation.
Can the MAX814LESA monitor voltages other than VCC?
Yes - the MAX814LESA's PFI pin accepts an externally derived voltage (e.g., from a resistor divider on a +12V rail), which is compared to its internal 2.50V reference. When PFI drops below 2.50V, PFO goes low to signal failure. This enables monitoring of any positive supply rail higher than ~2.5V without modifying the MAX814LESA itself.
What is the purpose of the LOW LINE pin on the MAX814LESA?
The LOW LINE pin (Pin 6) is an active-low warning output that asserts when VCC falls 60mV above the 4.70V reset threshold (i.e., at ~4.76V). It provides early notification - typically 200+ µs before RESET activates - allowing the µP to execute critical shutdown routines such as saving volatile data or disabling high-power peripherals before full reset occurs.
Is the MAX814LESA compatible with manual reset switches without external pull-up resistors?
Yes - the MAX814LESA includes an internal 150µA pull-up current on the MR pin (Pin 1), so a simple normally-open momentary switch between MR and GND is sufficient. No external resistor is needed, and the 1.10V MR low-threshold ensures compatibility with standard mechanical switches and CMOS/TTL logic drivers.
MAX814LESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814LESA FAQ
1.How can I place an order for MAX814LESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LESA 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 MAX814LESA reliable?
The price and inventory of MAX814LESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LESA is usually 5 days.
3.What payment methods are accepted for MAX814LESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LESA?
MAX814LESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LESA 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 MAX814LESA?
For technical support, including MAX814LESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LESA requirements.
6.How does Aetrix verify that MAX814LESA is sourced from the original manufacturer or authorized distributors?
All MAX814LESA 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 MAX814LESA meets industry standards.
7.What is the process for return or replacement of MAX814LESA?
All MAX814LESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LESA, 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 MAX814LESA part is unused and in its original packaging.
Return procedure for MAX814LESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX814LESA Tags
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MIC826SYMT-TR
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