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Analog Devices Inc./Maxim Integrated MAX819LESA+
- Part No.:
- MAX819LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX819LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,612
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Product details
Overview
MAX819LESA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with active-low reset, manual reset input (MR), battery backup switchover, and power-fail comparator (PFI/PFO). It features a 4.65V ±5% reset threshold, 200ms reset timeout, and 11µA quiescent current-designed for reliable brownout detection and RAM retention in portable 5V systems.
For engineers reviewing the MAX819LESA+ datasheet, MAX819LESA+ pinout, MAX819LESA+ application, or MAX819LESA+ equivalent, this device delivers verified manual reset control, battery-freshness seal enablement, and VCC/VBATT switchover logic-critical for embedded controllers, intelligent instruments, and critical µP monitoring where supply integrity and data retention are non-negotiable.
Technical Context
The MAX819LESA+ integrates a precision reset comparator with 25mV hysteresis, a dedicated manual reset input with internal 63kΩ pull-up, and a power-fail comparator referenced to 1.25V. Its reset generator guarantees low output for ≥200ms after VCC rises above 4.65V or MR transitions high.
Battery switchover activates when VCC falls below both VRST (4.65V) and VBATT, connecting BATT to OUT via an 80Ω PMOS switch; in backup mode, supply current drops to <1µA when VCC is >1V below VBATT. The PFI input supports external undervoltage monitoring with 4mV hysteresis and 1.20V–1.30V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±5% - ensures reliable reset assertion during +5V supply brownouts down to 4.42V |
| Reset Timeout Period | 200ms typical - guarantees µP initialization window compliant with Intel/ARM reset timing requirements |
| Quiescent Supply Current | 11µA typical - enables multi-year battery life in always-on portable instrumentation |
| Manual Reset Pulse Width | ≥100ns - accepts short debounced switch closures without external RC filtering |
| PFI Input Threshold | 1.25V ±25mV - supports accurate external supply monitoring using standard resistor dividers |
| BATT-to-OUT On-Resistance | 80Ω max - limits voltage drop to <80mV at 1mA backup load, preserving RAM data integrity |
| MR Input Pull-Up | 63kΩ internal - allows direct connection to open-drain logic or momentary switches without external components |
Pinout & Package
MAX819LESA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO and DIP variants. This space-constrained封装 supports high-density PCB layouts in portable and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switches between VCC and BATT; connects to CMOS RAM VDD to maintain data during power loss |
| 2 VCC | Main Supply Input | +5V system rail input; powers internal circuitry and enables VCC-to-OUT switching above 4.65V |
| 3 GND | Ground Reference | 0V return for all analog/digital functions; must be low-impedance for reset accuracy |
| 4 PFI | Power-Fail Input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V for supply warning |
| 5 PFO | Power-Fail Output | Open-drain output used for low-battery warning or to trigger MR on MAX819 for cascaded reset |
| 6 WDI | Watchdog Input | Not functional on MAX819LESA+ - unused pin; must be left open or tied to VCC/GND per design |
| 7 RESET | Active-Low Reset Output | Drives µP /RESET pin; guaranteed low for 200ms after power-up, brownout, or MR activation |
| 8 BATT | Backup Battery Input | Accepts 2.0V–5.5V battery or SuperCap; enables seamless switchover when VCC drops below VBATT |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Internal 63kΩ pull-up enables direct switch interface; asserts RESET for ≥200ms after release |
| Battery Freshness Seal | Disables BATT leakage (<1nA at +25°C) until first power cycle, ensuring shelf-life >10 years |
| Power-Fail Comparator | Dedicated 1.25V reference with 4mV hysteresis supports independent supply monitoring without µP involvement |
| VCC/VBATT Switchover Logic | Automatic transition to battery backup when VCC < VRST and VCC < VBATT; <1µA standby current in deep backup |
| Reset Timing Accuracy | 200ms timeout stable over -40°C to +85°C; ±10% variation across temperature and voltage |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous vital-sign logging in battery-powered ECG monitors requiring RAM retention during AC power interruptions. IC Role / Device Role / Timing Role: MAX819LESA+ provides active-low reset to initialize MCU on power-up and switches BATT to RAM supply within 10µs of VCC collapse. Use Value: Prevents data loss during 100ms–500ms grid dips; 11µA quiescent current extends AA battery life to >3 years. |
Use Scenario: Remote I/O expansion modules in factory automation exposed to 24VDC supply transients and brownouts. IC Role / Device Role / Timing Role: MAX819LESA+ monitors 5V local regulator output and asserts RESET if VCC drops below 4.42V, while PFI tracks 24V bus via resistor divider. Use Value: Eliminates spurious reboots from 10ms–50ms line sags; PFO-driven alarm alerts controller before full shutdown. |
| Smart Energy Meters | Avionics Data Recorders |
Use Scenario: Tamper-resistant electricity meters storing tariff data and consumption logs in nonvolatile SRAM. IC Role / Device Role / Timing Role: MAX819LESA+ enables battery freshness seal during manufacturing, then manages BATT-to-RAM switchover during meter removal from service. Use Value: Guarantees >10-year shelf life with sealed CR2032; <1µA backup current preserves 10+ years of log history. |
Use Scenario: Crash-protected flight data recorders requiring guaranteed write completion during sudden 28VDC failure. IC Role / Device Role / Timing Role: MAX819LESA+ detects 5V supply collapse and holds RESET low for 200ms while MR-triggered firmware saves last 5 seconds of telemetry to FRAM. Use Value: Meets DO-178C Level A timing assurance; 25mV reset hysteresis rejects 50Hz ripple-induced false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX819TESA+ | Same functionality, but rated for -40°C to +85°C industrial temperature range vs. 0°C to +70°C for MAX819LESA+ | Suitable for automotive under-hood or outdoor industrial deployments where extended thermal operation is required | Select MAX819TESA+ when ambient operating temperature exceeds +70°C or falls below 0°C |
| TPS3808G33DBVR | 3.3V reset threshold, no manual reset input, no PFI/PFO comparator; 2.5µA supply current | Lacks MR and power-fail monitoring-only suitable for basic reset supervision in 3.3V systems | Choose only if system operates at 3.3V and manual reset/power-fail warning are unnecessary |
Compared with MAX819LESA+, MAX819TESA+ offers identical pinout and features with extended temperature support, while TPS3808G33DBVR sacrifices MR and PFI capability for ultra-low power in 3.3V-only designs-making MAX819LESA+ the sole option for 5V systems needing manual reset and dual-supply monitoring.
Availability
MAX819LESA+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and avionics data recorders requiring stable component supply across long production lifecycles.
Supply support for MAX819LESA+ 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 connectivity applications in industrial, medical, and communications markets.
The MAX817/MAX818/MAX819 family was engineered specifically for robust +5V microprocessor supervision-integrating reset, battery switchover, manual reset, and power-fail detection in minimal footprint for portable and mission-critical systems.
FAQ
What is the reset threshold voltage of the MAX819LESA+?
The MAX819LESA+ has a factory-trimmed reset threshold of 4.65V ±5%, meaning it asserts active-low RESET when VCC falls below 4.42V and releases RESET after VCC rises above 4.88V. This threshold is fixed for the 'L' suffix variant and is validated across 0°C to +70°C operating temperature.
Does the MAX819LESA+ include a watchdog timer function?
No, the MAX819LESA+ does not include a watchdog timer. Unlike the MAX817 and MAX818, the MAX819 variant omits the WDI input and associated watchdog circuitry. Pin 6 (WDI) is unused and must be left floating or tied to VCC/GND-no internal functionality is associated with it in the MAX819LESA+.
How does the manual reset (MR) input work on the MAX819LESA+?
On the MAX819LESA+, the MR input is an active-low signal with an internal 63kΩ pull-up resistor. Driving MR low asserts RESET immediately; RESET remains low for ≥200ms after MR returns high. MR can be driven by TTL/CMOS logic or a momentary switch to GND-no external components are required for basic operation.
Can the MAX819LESA+ monitor a secondary voltage rail using the PFI input?
Yes, the MAX819LESA+ PFI input monitors external voltages via a resistor divider. With a 1.25V internal reference and ±25mV hysteresis, it reliably detects undervoltage on rails such as 3.3V, 2.5V, or 12V. When PFI falls below threshold, PFO goes low-enabling use as a standalone power-fail warning or cascaded reset trigger via connection to MR.
What is the battery switchover behavior of the MAX819LESA+ during power loss?
The MAX819LESA+ switches OUT from VCC to BATT only when both conditions are met: VCC falls below 4.65V AND VCC falls below VBATT. Once engaged, BATT powers OUT through an 80Ω switch; supply current drops to <1µA when VCC is >1V below VBATT-preserving battery life while maintaining RAM data integrity.
MAX819LESA+ 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX819LESA+ FAQ
1.How can I place an order for MAX819LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819LESA+ 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 MAX819LESA+ reliable?
The price and inventory of MAX819LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819LESA+ is usually 5 days.
3.What payment methods are accepted for MAX819LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819LESA+?
MAX819LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819LESA+ 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 MAX819LESA+?
For technical support, including MAX819LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819LESA+ requirements.
6.How does Aetrix verify that MAX819LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX819LESA+ 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 MAX819LESA+ meets industry standards.
7.What is the process for return or replacement of MAX819LESA+?
All MAX819LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX819LESA+, 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 MAX819LESA+ part is unused and in its original packaging.
Return procedure for MAX819LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX819LESA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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