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Analog Devices Inc./Maxim Integrated MAX819LCPA+
- Part No.:
- MAX819LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX819LCPA+.pdf
- Description:
- IC SUPERVISOR MPU 5V 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MAX819LCPA+ 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 supply current-designed for reliable brownout protection and RAM retention in portable 5V systems.
For engineers reviewing the MAX819LCPA+ datasheet, MAX819LCPA+ pinout, MAX819LCPA+ application, or MAX819LCPA+ equivalent, this device delivers verified manual reset control, battery-freshness seal enablement, and PFI-triggered reset assertion-critical for embedded controllers, intelligent instruments, and battery-powered computers requiring deterministic power-up/power-down sequencing.
Technical Context
The MAX819LCPA+ integrates a precision reset comparator with 4.65V threshold and 25mV hysteresis, a manual reset input with internal 63kΩ pull-up and 120ns minimum pulse width support, and a dedicated power-fail comparator (PFI input, PFO output) with 1.25V threshold and 4mV hysteresis. Its battery switchover circuit uses dual PMOS switches (5Ω VCC-to-OUT, 80Ω BATT-to-OUT) to maintain CMOS RAM supply during VCC brownout.
Unlike MAX817/MAX818, the MAX819LCPA+ excludes watchdog timer and chip-enable gating but adds MR functionality and retains full battery freshness seal operation-enabled only when MR is high or open. The PFO output can be wired to MR to convert power-fail events into system resets, though this disables freshness seal activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±5% - ensures reliable reset assertion before 5V supply drops below µP operational minimum. |
| Reset Timeout Period | 200ms typical - guarantees sufficient hold time for processor initialization after power-up or brownout recovery. |
| Supply Current | 11µA typical at +25°C - enables multi-year battery life in always-on portable monitoring applications. |
| Manual Reset Pulse Width | 120ns minimum - supports clean reset initiation from fast digital logic or microcontroller GPIO without external debouncing. |
| Battery Switchover Threshold | VCC < VBATT by ≥200mV - prevents premature battery engagement and minimizes leakage during marginal VCC conditions. |
| Power-Fail Input Threshold | 1.25V ±5mV - allows precise undervoltage detection of auxiliary rails (e.g., 3.3V, 2.5V) via resistor divider. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial and computing environments. |
Pinout & Package
MAX819LCPA+ is housed in an 8-pin plastic DIP package (0.300" wide), with through-hole mounting and industry-standard pin spacing. Pin 1 is marked with a dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT based on voltage comparison; drives RAM VDD with ≤5Ω on-resistance from VCC. |
| 2 VCC | +5V main supply input | Primary power source; powers internal circuitry and enables VCC-to-OUT switch when above reset threshold. |
| 3 GND | Ground reference | 0V return path for all analog and digital functions; must be low-impedance for accurate reset threshold sensing. |
| 4 PFI | Power-fail comparator input | Monitors external voltage rail; asserts PFO low when input falls below 1.25V-used for secondary supply monitoring. |
| 5 PFO | Power-fail comparator output | Open-drain output; can drive MAX819LCPA+ MR input directly to generate power-fail-induced reset. |
| 6 WDI | Watchdog input | No functional connection in MAX819LCPA+; internally unused-leave unconnected or tied to GND/VCC per layout best practices. |
| 7 RESET | Active-low reset output | Drives µP reset pin low for ≥200ms after VCC rise, MR assertion, or PFO-triggered event; sinks 3.2mA min. |
| 8 BATT | Backup battery input | Accepts 2.0V–5.5V battery or supercap; connects to OUT via 80Ω switch when VCC drops below VBATT and reset threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Internal 63kΩ pull-up enables direct switch-to-GND implementation; no external components required for field-serviceable reset. |
| Battery Freshness Seal | Disables BATT-to-OUT path until first power cycle completes, preserving shelf life of backup battery for up to 10 years. |
| Power-Fail Comparator | Dedicated PFI/PFO pair with 1.25V threshold allows independent monitoring of non-5V rails without affecting reset timing. |
| Low Quiescent Current | 11µA supply draw enables integration into energy-constrained designs such as handheld data loggers and sensor nodes. |
| VCC Brownout Immunity | Ignores transients ≤100µs duration at ≤40mV overdrive-prevents false resets during switching noise or ESD events. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-backed ECG data logger operating in intermittent duty cycle with 5V main supply and coin-cell backup. IC Role / Device Role / Timing Role: MAX819LCPA+ monitors VCC for brownout, asserts RESET to halt MCU during power loss, and switches RAM supply to BATT to preserve waveform buffers. Use Value: Ensures zero data loss during 100ms AC dropout; 11µA quiescent current extends coin-cell life beyond 5 years. |
Use Scenario: DIN-rail mounted PLC module with isolated 5V logic supply and nonvolatile configuration memory. IC Role / Device Role / Timing Role: MAX819LCPA+ provides deterministic reset during factory commissioning and field firmware updates, while PFI monitors 3.3V FPGA I/O rail. Use Value: Prevents configuration corruption during brownout; PFO-to-MR wiring converts 3.3V rail failure into immediate system reset. |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Revenue-grade meter with tamper-detection circuitry and EEPROM-based tariff storage. IC Role / Device Role / Timing Role: MAX819LCPA+ guards against undervoltage-induced EEPROM write errors by holding RESET low until VCC stabilizes post-power-restoration. Use Value: Guarantees 200ms minimum reset pulse width-meeting IEC 62053-21 requirements for secure metering state transitions. |
Use Scenario: Retail terminal with flash-based OS and real-time clock backed by lithium battery. IC Role / Device Role / Timing Role: MAX819LCPA+ enables operator-initiated warm reboot via front-panel button (MR), while maintaining RTC power via BATT-to-OUT switchover. Use Value: Eliminates need for separate reset controller IC; MR input tolerates noisy mechanical switch bounce without external RC filtering. |
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); 471mW max power dissipation vs. 727mW for DIP. | Preferred for automated PCB assembly and space-constrained layouts; requires reflow-compatible footprint. | Select MAX819LESA+ when board area or manufacturing process favors SMT over through-hole. |
| MAX819LTSA+ | Same functionality in 8-pin µMAX package (3mm × 3mm); operates over -40°C to +85°C vs. 0°C to +70°C for MAX819LCPA+. | Suitable for extended-temperature deployments like outdoor kiosks or automotive infotainment gateways. | Choose MAX819LTSA+ for industrial or automotive-adjacent applications requiring wider thermal margin. |
Compared with MAX819LCPA+, MAX819LESA+ offers identical supervision features in a smaller footprint but lower thermal headroom, while MAX819LTSA+ extends temperature range at the cost of higher unit price and tighter layout constraints-making MAX819LCPA+ optimal for cost-sensitive commercial equipment with standard ambient requirements.
Availability
MAX819LCPA+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply across multi-year production cycles.
Supply support for MAX819LCPA+ 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 MAX819LCPA+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power-monitoring and fail-safe reset generation in +5V µP systems with battery backup requirements.
FAQ
What is the reset threshold voltage of the MAX819LCPA+?
The MAX819LCPA+ has a factory-trimmed reset threshold of 4.65V ±5%, optimized for +5V systems. This value is guaranteed over the full 0°C to +70°C operating temperature range and includes 25mV hysteresis to prevent chatter during slow VCC recovery. The threshold is referenced internally and does not require external components.
Does the MAX819LCPA+ include a watchdog timer function?
No, the MAX819LCPA+ does not include a watchdog timer. Unlike the MAX817/MAX818 variants, the MAX819LCPA+ omits the WDI input and internal watchdog circuitry to prioritize manual reset capability and power-fail comparator functionality. Pin 6 (WDI) is unused and should be left unconnected or tied to GND/VCC per layout guidelines.
How does the battery freshness seal work on the MAX819LCPA+?
The battery freshness seal on the MAX819LCPA+ disconnects the BATT pin from internal circuitry until the first valid power cycle completes. To enable it: apply VCC above 4.65V, hold until RESET deasserts after 200ms, then cycle VCC low. MR must be high or open during this sequence. Once enabled, the seal remains active until next power-on, preserving battery shelf life.
Can the MAX819LCPA+ monitor a 3.3V supply rail?
Yes, the MAX819LCPA+ can monitor a 3.3V rail using its PFI input and 1.25V internal reference. Connect the rail to PFI through a resistor divider (e.g., R1 = 16.2kΩ, R2 = 10kΩ) to scale 3.3V down to 1.25V. When the rail drops below the trip point, PFO goes low and can be wired to MR to trigger a system reset-though this disables the battery freshness seal.
What is the maximum load current supported by the OUT pin of the MAX819LCPA+?
The OUT pin of the MAX819LCPA+ supports up to 250mA continuous current when sourced from VCC (via 5Ω internal PMOS switch) and up to 50mA when sourced from BATT (via 80Ω internal PMOS switch). Exceeding these limits risks thermal shutdown or permanent damage; decoupling capacitors (0.1µF) at VCC, OUT, and BATT are mandatory per datasheet layout guidance.
MAX819LCPA+ 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:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX819LCPA+ FAQ
1.How can I place an order for MAX819LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819LCPA+ 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 MAX819LCPA+ reliable?
The price and inventory of MAX819LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX819LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819LCPA+?
MAX819LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819LCPA+ 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 MAX819LCPA+?
For technical support, including MAX819LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819LCPA+ requirements.
6.How does Aetrix verify that MAX819LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX819LCPA+ 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 MAX819LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX819LCPA+?
All MAX819LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX819LCPA+, 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 MAX819LCPA+ part is unused and in its original packaging.
Return procedure for MAX819LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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