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Analog Devices Inc./Maxim Integrated MAX814LEPA+
- Part No.:
- MAX814LEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX814LEPA+.pdf
- Description:
- IC SUPERVISOR MPU LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,443
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Product details
Overview
MAX814LEPA+ 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 ±1% worst-case reset threshold accuracy (4.7V), 200ms reset pulse width, active-low RESET output, guaranteed valid reset down to VCC = 1V, and 75µA max supply current. It is used in medical equipment and portable battery-powered controllers requiring reliable brownout detection.
For engineers reviewing the MAX814LEPA+ datasheet, MAX814LEPA+ pinout, MAX814LEPA+ application, or MAX814LEPA+ equivalent, this page delivers verified technical context, exact pin roles, real-world timing behavior, and validated alternative options - all grounded in Maxim's official electrical characteristics and application diagrams for the MAX814L variant.
Technical Context
The MAX814LEPA+ implements a precision voltage-monitoring architecture with independent reset comparator, low-line detector (60mV above reset threshold), and power-fail comparator (2.50V reference). Its reset assertion is guaranteed valid for VCC ≥ 1V, and it ignores transients ≤30µs at 100mV overdrive below threshold.
It uses an internal 150µA pullup on MR and supports CMOS/TTL-compatible manual reset triggering. The device operates across 0°C to +70°C and is specified for VCC = 4.75V to 5.5V, with reset threshold VRT = 4.70V ±1% (L-suffix) and hysteresis of 0mV per datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.70V ±1% - ensures reset asserts before critical +5V µP operating margin is violated under worst-case temp/line/load. |
| Reset Pulse Width | 200ms minimum - guarantees sufficient duration to fully initialize microprocessors after power-up or brownout recovery. |
| Supply Current | 75µA max - enables use in always-on battery-backed systems without significant drain. |
| VCC Operating Range | 4.75V to 5.5V - matches standard +5V rail tolerances and supports full-system operation across industrial range. |
| RESET Output Type | Active-low open-drain compatible - sinks ≥3.2mA at 0.4V, allowing direct interface to µP reset inputs with external pullup. |
| Low-Line Detection | 60mV above reset threshold - provides early warning of falling VCC before reset triggers, enabling orderly shutdown. |
| Power-Fail Reference | 2.50V - monitors auxiliary rails (e.g., +12V via divider) and asserts PFO when input falls below threshold. |
Pinout & Package
MAX814LEPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant and lead-free (+ suffix). Pin spacing is 0.100", body width 0.300", and total length 0.395".
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Active-low CMOS/TTL-compatible input; internal 150µA pullup to VCC; triggers reset when pulled <1.10V. |
| 2 | VCC | +5V supply input; reset asserted while VCC < 4.70V; RESET remains valid down to VCC = 1V. |
| 3 | GND | Ground reference for all internal comparators and outputs. |
| 4 | PFI (Power-Fail Input) | Monitors external voltage via resistor divider; compares to 2.50V internal reference; used for early warning. |
| 5 | PFO (Power-Fail Output) | Active-low open-drain output; sinks ≥1.2mA when PFI < 2.50V; signals impending supply failure to µP. |
| 6 | LOW LINE | Active-low open-drain output; asserts when VCC falls 60mV above reset threshold; enables NMI-based shutdown prep. |
| 7 | RESET | Active-low reset output; guaranteed logic low (≤0.4V) for VCC ≥ 1V; 200ms minimum pulse width after threshold crossing. |
| 8 | RESET | Active-high reset output - inverse of pin 7; provided for µPs requiring high-asserted reset signal. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset timing across temperature, voltage, and process variation. |
| Guaranteed RESET validity to VCC = 1V | Enables robust reset assertion during slow power-down or brownout, preventing µP runaway before supply collapse. |
| Power-supply glitch immunity | Rejects negative VCC transients ≤30µs at 100mV overdrive - prevents spurious resets in noisy environments. |
| Low-line detector with 60mV offset | Provides 200µs–500µs advance warning before reset triggers, allowing µP to save state and disable peripherals. |
| 75µA max supply current | Supports multi-year battery life in portable medical monitors and handheld instrumentation with always-on supervision. |
Applications
| Medical Equipment | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Continuous vital-sign monitoring in handheld ECG or glucose meters with backup coin-cell power. IC Role / Device Role / Timing Role: Supervises main +5V rail and triggers controlled shutdown before battery depletion causes data corruption. Use Value: Prevents loss of patient-critical measurements by asserting LOW LINE 200µs before RESET, enabling flash write completion. |
Use Scenario: Industrial handheld data collector operating from rechargeable Li-ion with undervoltage cutoff. IC Role / Device Role / Timing Role: Monitors system VCC and asserts RESET if voltage drops below 4.70V during high-current RF transmission bursts. Use Value: Ensures µP restarts cleanly after transient brownout, avoiding firmware lockup without user intervention. |
| Controllers | Intelligent Instruments |
Use Scenario: PLC I/O module with isolated +5V logic supply and watchdog-independent reset path. IC Role / Device Role / Timing Role: Provides dedicated reset generation and manual reset via front-panel button (MR pin). Use Value: Enables field-service recovery without power cycle; MR debounce handled internally - no external RC needed. |
Use Scenario: Benchtop multimeter with EEPROM calibration storage and auto-ranging analog front-end. IC Role / Device Role / Timing Role: Uses PFI/PFO to monitor +12V analog supply; asserts interrupt before analog section fails. Use Value: Allows instrument to flag "CAL ERROR" and halt measurements before inaccurate readings are recorded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814LESA+ | Same electrical specs, but in 8-pin SO package (3.9mm × 4.9mm); 1.75mm height vs. DIP's 3.3mm. | Preferred for space-constrained PCBs; requires rework of footprint and thermal relief design. | Select for automated SMT assembly and higher board density; verify SO thermal performance under 70°C ambient. |
| TPS3808G33DBVR | 3.3V fixed threshold, 350ms reset timeout, 2.5µA quiescent current; no LOW LINE or PFI/PFO functions. | Suitable only for basic reset supervision in low-power 3.3V systems; lacks early-warning and dual-rail monitoring. | Choose only if system uses 3.3V VCC and requires ultra-low IQ; not a functional substitute for MAX814LEPA+'s full feature set. |
Compared with MAX814LEPA+, MAX814LESA+ offers identical supervision functionality in a smaller surface-mount package, while TPS3808G33DBVR trades comprehensive monitoring capability for extreme low-power operation - making it suitable only for simplified 3.3V reset-only use cases.
Availability
MAX814LEPA+ is available at Aetrix Electronics and suitable for medical equipment, portable/battery-powered equipment, controllers, and intelligent instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX814LEPA+ 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 demanding industrial, medical, and communications applications.
The MAX814 family targets high-reliability microprocessor supervision in safety-critical systems, emphasizing ±1% threshold accuracy, glitch immunity, and multi-function integration (reset, low-line, power-fail) in a single 8-pin package.
FAQ
What is the exact reset threshold voltage of the MAX814LEPA+?
The MAX814LEPA+ has a factory-trimmed reset threshold of 4.70V with ±1% worst-case accuracy over temperature and supply variation. This value is confirmed in the Electrical Characteristics table for MAX814L devices at VCC = 4.75V to 5.5V and TA = 0°C to +70°C. The L-suffix explicitly denotes the 4.7V threshold variant, and the + symbol indicates lead-free packaging - it does not affect the threshold.
Does the MAX814LEPA+ provide both active-high and active-low reset outputs?
Yes, the MAX814LEPA+ provides dual reset outputs: pin 7 is active-low RESET, and pin 8 is active-high RESET - the logical inverse of pin 7. Both outputs are guaranteed valid down to VCC = 1V, with pin 7 sinking ≥3.2mA at 0.4V and pin 8 sourcing ≥800µA at VCC – 1.5V, enabling direct interface to diverse µP reset architectures.
Can the MAX814LEPA+ monitor voltages other than VCC, such as a +12V rail?
Yes, the MAX814LEPA+ can monitor auxiliary rails using the PFI pin. For example, a resistor divider from +12V to GND sets PFI voltage; when that voltage falls below 2.50V (the internal reference), PFO asserts low. Figure 11 in the datasheet shows a verified +12V monitoring circuit achieving 11.00V ±0.43V trip point - confirming accurate external rail supervision capability for the MAX814LEPA+.
What is the purpose of the LOW LINE pin on the MAX814LEPA+?
The LOW LINE pin on the MAX814LEPA+ is an active-low open-drain output that asserts when VCC falls 60mV above the 4.70V reset threshold (i.e., at ~4.76V). It provides early warning of impending reset, enabling the µP to execute shutdown routines - such as saving calibration data or disabling high-side switches - before VCC crosses the final reset threshold and halts operation.
How does the MAX814LEPA+ handle power supply transients or noise on VCC?
The MAX814LEPA+ rejects fast negative-going VCC transients up to 30µs in duration when the overdrive is 100mV below the 4.70V reset threshold, as characterized in Figure MAX814-13. This built-in glitch immunity prevents spurious resets in electrically noisy environments - a key requirement validated in medical and industrial controller applications where supply stability cannot be assumed.
MAX814LEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX814LEPA+ FAQ
1.How can I place an order for MAX814LEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814LEPA+ 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 MAX814LEPA+ reliable?
The price and inventory of MAX814LEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814LEPA+ is usually 5 days.
3.What payment methods are accepted for MAX814LEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814LEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814LEPA+?
MAX814LEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814LEPA+ 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 MAX814LEPA+?
For technical support, including MAX814LEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814LEPA+ requirements.
6.How does Aetrix verify that MAX814LEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX814LEPA+ 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 MAX814LEPA+ meets industry standards.
7.What is the process for return or replacement of MAX814LEPA+?
All MAX814LEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814LEPA+, 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 MAX814LEPA+ part is unused and in its original packaging.
Return procedure for MAX814LEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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