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Analog Devices Inc./Maxim Integrated MAX819MCSA+
- Part No.:
- MAX819MCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX819MCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
MAX819MCSA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with manual reset input, active-low reset output, battery backup switchover, and power-fail comparator functionality. It features a 4.40V ±10% reset threshold, 200ms reset timeout, 11µA quiescent supply current, and operates in 0°C to +70°C temperature range. Designed for portable embedded systems requiring reliable brownout protection and nonvolatile memory retention.
For engineers reviewing the MAX819MCSA+ datasheet, MAX819MCSA+ pinout, MAX819MCSA+ application, or MAX819MCSA+ equivalent, this device serves as a precision voltage monitor and system supervisor in battery-backed µP systems where manual reset initiation, power-fail warning, and low-quiescent-current operation are critical selection criteria.
Technical Context
The MAX819MCSA+ integrates a precision reset comparator with 4.40V threshold (±10%), a manual reset input with internal 63kΩ pull-up, and a dedicated power-fail comparator (PFI/PFO) independent of the reset path. Its reset generator guarantees 200ms minimum assertion time after VCC rise or MR deassertion, and maintains valid reset state down to VCC = 1V when VBATT > 1V.
Battery switchover logic activates when VCC falls below both VRST (4.40V) and VBATT, connecting BATT to OUT via an 80Ω PMOS switch; OUT remains connected to VCC via a 5Ω switch during normal operation. The PFO output doubles as a battery freshness seal enable signal when grounded during power cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - sets brownout detection point for +5V systems; triggers reset when VCC drops below this level |
| Reset Timeout Period | 200ms typical - ensures µP remains held in reset long enough for stable power recovery and clock stabilization |
| Supply Current | 11µA typical - enables multi-year battery life in portable equipment with backup battery monitoring |
| Manual Reset Input | Active-low with 63kΩ internal pull-up - supports direct switch-to-ground interface without external components |
| Power-Fail Comparator | 1.25V threshold on PFI - provides configurable undervoltage warning for secondary supplies or battery monitoring |
| Battery Switchover | VCC-to-BATT transition at VCC < VBATT - preserves CMOS RAM data during main supply failure without external diodes |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded controller and instrumentation applications |
Pinout & Package
MAX819MCSA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), compatible with SO and DIP footprints. The µMAX package enables high-density PCB layouts while maintaining thermal performance suitable for portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC (via 5Ω) or BATT (via 80Ω); powers CMOS RAM during main supply failure |
| 2 VCC | Main Supply Input | +5V system rail input; powers internal circuitry and enables VCC-to-OUT conduction above reset threshold |
| 3 GND | Ground Reference | 0V reference for all analog comparators, reset logic, and I/O pins; must be low-impedance connection |
| 4 PFI | Power-Fail Input | Analog input for external undervoltage monitoring; compared to 1.25V internal reference to drive PFO |
| 5 PFO | Power-Fail Output | Open-drain output asserting low on PFI < 1.25V or VCC < VBATT; used for warning or battery freshness seal enable |
| 6 WDI | Watchdog Input | Not present on MAX819 - unused pin; left unconnected or tied to GND per layout guidelines |
| 7 RESET | Active-Low Reset Output | Open-drain reset signal asserted low for ≥200ms after VCC rise, MR activation, or brownout |
| 8 BATT | Backup Battery Input | Input for lithium or supercapacitor backup source; connects to OUT when VCC falls below VBATT and VRST |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Active-low input with internal 63kΩ pull-up enables hardware-initiated reset using momentary switch without external biasing |
| Power-Fail Comparator | Dedicated 1.25V threshold comparator on PFI allows independent monitoring of auxiliary rails or battery voltage with PFO output |
| Battery Freshness Seal | Enables OEMs to isolate backup battery until first power-up by grounding PFO during controlled VCC ramp-down sequence |
| Low Quiescent Current | 11µA typical supply current extends shelf life and runtime in always-on battery-backed systems |
| Reset Timing Guarantee | 200ms minimum reset pulse width ensures reliable µP initialization across full temperature and voltage ranges |
Applications
| Portable Medical Instrumentation | Industrial Data Logger |
|---|---|
Use Scenario: Handheld blood glucose meter with nonvolatile memory storing calibration history and usage logs. IC Role / Device Role / Timing Role: MAX819MCSA+ monitors main 5V supply and asserts reset during battery swap or low-voltage condition; enables manual recalibration reset via front-panel button. Use Value: Prevents memory corruption during power transitions and ensures deterministic startup after user-initiated recalibration. |
Use Scenario: Remote environmental sensor node logging temperature/humidity to SPI FRAM, powered by LiSOCl₂ battery. IC Role / Device Role / Timing Role: MAX819MCSA+ provides brownout reset and switches FRAM supply to backup battery when main supply dips below 4.40V. Use Value: Guarantees data integrity during intermittent solar charging cycles and eliminates need for external power-path ICs. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Credit card terminal with real-time clock and secure EEPROM, requiring tamper-proof power monitoring. IC Role / Device Role / Timing Role: MAX819MCSA+ detects AC adapter removal and initiates graceful shutdown via PFO-triggered interrupt to µP before switching to coin cell. Use Value: Enables secure session termination and cryptographic key preservation during unexpected power loss. |
Use Scenario: DIN-rail mounted electricity meter with metrology ASIC and backup SRAM retaining tariff data. IC Role / Device Role / Timing Role: MAX819MCSA+ monitors 5V DC-DC output and asserts reset if input voltage sags due to grid fluctuation; MR pin supports field-service reset. Use Value: Meets IEC 62053-21 reset timing requirements and ensures meter firmware restarts cleanly after voltage recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX819LCSA+ | 4.65V ±5% reset threshold instead of 4.40V ±10%; identical pinout and feature set | Suitable for tighter-tolerance +5V systems where 4.65V brownout margin is required | Select MAX819LCSA+ when design uses regulated 5.0V ±3% supply and requires higher reset threshold accuracy |
| MAX692AESA+ | Lacks manual reset input and power-fail comparator; includes watchdog timer (1.6s) and chip-enable gating | Targeted at µP systems needing watchdog supervision but not manual reset or auxiliary voltage monitoring | Choose MAX692AESA+ only if watchdog functionality is mandatory and MR/PFI features are unnecessary |
Compared with MAX819MCSA+, MAX819LCSA+ offers tighter reset threshold tolerance for stable 5V rails, while MAX692AESA+ trades manual reset and power-fail capability for integrated watchdog timing-making it unsuitable for applications requiring user-initiated reset or dual-supply monitoring.
Availability
MAX819MCSA+ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial data loggers, point-of-sale terminals, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX819MCSA+ 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 MAX817/MAX818/MAX819 family was designed specifically for +5V microprocessor systems needing integrated voltage monitoring, battery backup control, and system-level supervision in space-constrained portable equipment.
FAQ
What is the reset threshold voltage of the MAX819MCSA+?
The MAX819MCSA+ has a factory-trimmed reset threshold of 4.40V ±10%, optimized for +5V systems with looser regulation tolerances. This value is specified over the full operating temperature range (0°C to +70°C) and ensures reliable brownout detection even under transient load conditions. The threshold is internally generated and does not require external resistor networks.
Does the MAX819MCSA+ include a watchdog timer function?
No, the MAX819MCSA+ does not include a watchdog timer. Unlike the MAX817 and MAX818 variants, the MAX819 omits the WDI (watchdog input) pin and associated timing circuitry. Its functional focus is on manual reset initiation, power-fail monitoring, and battery switchover-making it distinct within the MAX817/818/819 family.
How does the manual reset input (MR) operate on the MAX819MCSA+?
The MR pin on the MAX819MCSA+ is an active-low input with an internal 63kΩ pull-up resistor. Driving MR low asserts RESET for the duration of the low signal plus a guaranteed 200ms timeout after MR returns high. The pin accepts TTL/CMOS logic levels and can be directly interfaced with a momentary switch to ground-no external components are required for basic operation.
Can the MAX819MCSA+ monitor a secondary voltage rail besides VCC?
Yes, the MAX819MCSA+ includes a dedicated power-fail comparator with PFI input referenced to a precise 1.25V internal threshold. By scaling an external voltage with a resistor divider into PFI, designers can monitor auxiliary supplies (e.g., 3.3V, 2.5V, or battery voltage) and generate warnings or trigger resets via the PFO output or by connecting PFO to MR.
What package type is used for the MAX819MCSA+?
The MAX819MCSA+ is supplied in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), which is pin-compatible with standard 8-pin SO and DIP footprints. This space-saving package supports high-density PCB layouts while maintaining thermal performance suitable for battery-powered applications.
MAX819MCSA+ 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX819MCSA+ FAQ
1.How can I place an order for MAX819MCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819MCSA+ 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 MAX819MCSA+ reliable?
The price and inventory of MAX819MCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819MCSA+ is usually 5 days.
3.What payment methods are accepted for MAX819MCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819MCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819MCSA+?
MAX819MCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819MCSA+ 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 MAX819MCSA+?
For technical support, including MAX819MCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819MCSA+ requirements.
6.How does Aetrix verify that MAX819MCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX819MCSA+ 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 MAX819MCSA+ meets industry standards.
7.What is the process for return or replacement of MAX819MCSA+?
All MAX819MCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX819MCSA+, 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 MAX819MCSA+ part is unused and in its original packaging.
Return procedure for MAX819MCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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