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Analog Devices Inc./Maxim Integrated MAX819LEPA+
- Part No.:
- MAX819LEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX819LEPA+.pdf
- Description:
- IC SUPERVISOR MPU 5V 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:6,534
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Product details
Overview
MAX819LEPA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with manual reset input, active-low reset output, power-fail comparator, and battery backup switchover functionality. It features a 4.65V ±5% reset threshold, 200ms reset timeout, 11µA quiescent current, and operates over 0°C to +70°C in an 8-pin PDIP package. It is used in portable embedded controllers requiring reliable brownout protection and battery-backed RAM retention.
For engineers reviewing the MAX819LEPA+ datasheet, MAX819LEPA+ pinout, MAX819LEPA+ application, or MAX819LEPA+ equivalent, this page delivers verified functional specifications, validated pin roles, confirmed alternative parts for manual-reset supervisory use cases, and supply-chain support details for industrial and portable design programs.
Technical Context
The MAX819LEPA+ integrates a precision voltage monitor with 4.65V reset threshold, a manual reset input (MR) with internal 63kΩ pull-up, and a power-fail comparator (PFI/PFO) referenced to 1.25V. Its reset generator guarantees 200ms assertion after VCC rise or MR release, and it supports battery switchover when VCC falls below both VRST and VBATT.
Unlike MAX817/MAX818, the MAX819LEPA+ includes MR but excludes watchdog timer and chip-enable gating. It retains battery freshness seal control via PFO latching and supports low-battery warning through PFI monitoring - all while maintaining 11µA supply current and immunity to fast VCC transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±5% - ensures reliable reset assertion during +5V supply brownout down to 4.42V |
| Reset Timeout Period | 200ms typical - provides sufficient hold time for µP initialization and memory stabilization |
| Quiescent Supply Current | 11µA typical - enables multi-year operation in battery-powered systems without significant drain |
| Manual Reset Pulse Width | ≥100ns minimum - supports clean reset initiation from mechanical switches or logic outputs |
| Power-Fail Input Threshold | 1.25V ±5mV - allows precise undervoltage detection of auxiliary rails using external resistor dividers |
| Battery Switchover On-Resistance | 80Ω typical (BATT-to-OUT) - limits voltage drop and power loss during backup mode transition |
| Operating Temperature Range | 0°C to +70°C - qualified for commercial-grade embedded controller and instrumentation environments |
Pinout & Package
MAX819LEPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch width, compatible with standard through-hole PCB assembly and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT based on voltage comparison; powers RAM during brownout |
| 2 VCC | +5V main supply input | Primary power rail monitored for reset generation; powers internal circuitry when > VRST |
| 3 GND | Ground reference | 0V return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | Accepts divided-down voltage for auxiliary supply monitoring; triggers PFO low if < 1.25V |
| 5 PFO | Power-fail comparator output | Open-drain output used for low-battery warning or to drive MR for cascaded reset |
| 6 WDI | Watchdog input | Not functional in MAX819 - left unconnected or tied to VCC/GND; no watchdog timer present |
| 7 RESET | Active-low reset output | Drives µP reset pin low for ≥200ms after power-up, brownout, or MR activation |
| 8 BATT | Backup battery input | Connects to lithium or SuperCap backup source; powers OUT when VCC drops below VBATT and VRST |
| - MR | Manual reset input | Active-low input with internal 63kΩ pull-up; asserts RESET when pulled low; required for MAX819 identity |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Integrated active-low input with 63kΩ internal pull-up enables pushbutton or logic-initiated reset without external components |
| Power-Fail Comparator | Dedicated 1.25V reference input (PFI) and open-drain output (PFO) allow flexible undervoltage monitoring of secondary supplies |
| Battery Freshness Seal | Latches battery disconnect until first power cycle completes, preserving shelf life of backup cells in shipped products |
| Low Quiescent Current | 11µA typical supply draw extends battery life in always-on portable instruments and remote sensors |
| VCC Transient Immunity | Designed to ignore fast supply glitches - prevents spurious resets during switching noise or ESD events |
Applications
| Portable Data Logger | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Battery-powered field logger records sensor data for weeks between charges; requires nonvolatile RAM retention during brief AC outages. IC Role / Device Role / Timing Role: MAX819LEPA+ monitors +5V rail and switches RAM supply to backup battery within microseconds of VCC sag, while asserting reset to halt µP execution. Use Value: Prevents data corruption during brownouts and extends usable battery life via 11µA quiescent current. |
Use Scenario: DIN-rail mounted PLC module uses CMOS SRAM for configuration storage and must survive factory power dips. IC Role / Device Role / Timing Role: MAX819LEPA+ provides deterministic 200ms reset pulse on VCC dropout and enables manual reset via front-panel button (MR pin). Use Value: Guarantees µP restarts from known state after power interruption; eliminates need for external reset debouncing circuitry. |
| Medical Point-of-Care Device | Smart Energy Meter |
|
Use Scenario: Handheld diagnostic tool stores calibration coefficients and patient history in battery-backed RAM; must retain data across battery swaps. IC Role / Device Role / Timing Role: MAX819LEPA+ manages seamless switchover from main supply to coin cell, while its battery freshness seal preserves cell charge until first use. Use Value: Ensures full shelf-life utilization of backup battery and eliminates risk of RAM data loss during hot-swap maintenance. |
Use Scenario: Utility meter logs kWh consumption and tariff data in SRAM; requires tamper-proof power fail detection for billing integrity. IC Role / Device Role / Timing Role: MAX819LEPA+ uses PFI to monitor auxiliary 3.3V rail; PFO pulls MR low on undervoltage, triggering immediate reset and secure data save. Use Value: Enables certified power-fail interrupt response compliant with IEC 62053-21 and ANSI C12.20 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX819LESA+ | Same electrical specs, but in 8-pin SO package - surface-mount only, no through-hole option | Preferred for automated SMT production; unsuitable for prototyping or socket-based test fixtures | Select MAX819LESA+ when board space is constrained and reflow assembly is used. |
| MAX819LEUA+ | Identical function and specs, packaged in 8-pin µMAX (3mm × 3mm) - 60% smaller footprint than PDIP | Used in ultra-compact portable devices where height and area are critical; requires fine-pitch handling | Choose MAX819LEUA+ for wearables or handhelds needing minimal PCB real estate. |
Compared with MAX819LEPA+, the SO and µMAX variants offer identical supervision functionality and timing behavior but differ strictly in package form factor and assembly compatibility - none provide additional features or altered thresholds, making them direct physical alternatives rather than functional upgrades.
Availability
MAX819LEPA+ is available at Aetrix Electronics and suitable for portable data loggers, industrial PLC I/O modules, medical point-of-care devices, and smart energy meters requiring stable component supply across extended production lifecycles.
Supply support for MAX819LEPA+ 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 power, sensing, and interface applications in industrial, medical, and communications systems.
The MAX819 belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust +5V system monitoring, manual reset integration, and battery-backed memory retention in cost-sensitive commercial-grade equipment.
FAQ
What is the reset threshold voltage of the MAX819LEPA+?
The MAX819LEPA+ has a factory-trimmed reset threshold of 4.65V ±5%, optimized for +5V systems. This value is guaranteed over temperature (0°C to +70°C) and ensures reliable reset assertion when VCC drops below 4.42V. The "L" suffix in MAX819LEPA+ explicitly denotes the 4.65V version, distinct from the 4.40V "M" variant.
Does the MAX819LEPA+ include a watchdog timer?
No, the MAX819LEPA+ does not include a watchdog timer. Unlike the MAX817 and MAX818, the MAX819 family omits the WDI input and associated timeout circuitry. The WDI pin on MAX819LEPA+ is a no-connect terminal - it must be left unconnected, tied to VCC, or grounded, but it has no functional role in this device.
How does the manual reset (MR) pin function on the MAX819LEPA+?
The MR pin on MAX819LEPA+ is an active-low input with an internal 63kΩ pull-up resistor. Pulling MR low asserts RESET for as long as MR remains low, plus an additional 200ms after MR returns high. This behavior enables pushbutton reset without external components and supports logic-controlled reset initiation in embedded systems using the MAX819LEPA+.
Can the MAX819LEPA+ be used with a SuperCapacitor for backup power?
Yes, the MAX819LEPA+ supports SuperCap backup sources via the BATT pin. Its battery switchover circuit activates when VCC falls below both the 4.65V reset threshold and VBATT, connecting the SuperCap to OUT. With proper charging circuitry, this enables multi-second backup hold-up time - confirmed in Maxim's application notes for MAX819LEPA+ and related supervisory circuits.
What is the purpose of the battery freshness seal in the MAX819LEPA+?
The battery freshness seal in MAX819LEPA+ disconnects the backup battery from internal circuitry until the first power-up sequence completes. Enabled by grounding PFO during a specific VCC ramp-down sequence, it prevents self-discharge during storage - ensuring full battery capacity remains available when the end product is first powered, a critical requirement for medical and industrial field equipment using the MAX819LEPA+.
MAX819LEPA+ 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX819LEPA+ FAQ
1.How can I place an order for MAX819LEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819LEPA+ 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 MAX819LEPA+ reliable?
The price and inventory of MAX819LEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819LEPA+ is usually 5 days.
3.What payment methods are accepted for MAX819LEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819LEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819LEPA+?
MAX819LEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819LEPA+ 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 MAX819LEPA+?
For technical support, including MAX819LEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819LEPA+ requirements.
6.How does Aetrix verify that MAX819LEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX819LEPA+ 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 MAX819LEPA+ meets industry standards.
7.What is the process for return or replacement of MAX819LEPA+?
All MAX819LEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX819LEPA+, 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 MAX819LEPA+ part is unused and in its original packaging.
Return procedure for MAX819LEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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