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Analog Devices Inc./Maxim Integrated MAX819MCPA+
- Part No.:
- MAX819MCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX819MCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,916
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Product details
Overview
MAX819MCPA+ 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, and 11µA quiescent supply current-designed for reliable undervoltage monitoring and system recovery in portable and embedded µP systems.
For engineers reviewing the MAX819MCPA+ datasheet, MAX819MCPA+ pinout, MAX819MCPA+ application, or MAX819MCPA+ equivalent, this page delivers verified functional scope, exact pin roles, real-world timing behavior (e.g., 200ms reset hold, 1.6s watchdog timeout), battery switchover hysteresis (±20mV), and design-critical leakage specs (e.g., <1nA battery standby current at 0°C).
Technical Context
The MAX819MCPA+ integrates a precision reset comparator with 4.40V threshold and 25mV hysteresis, a manual reset input with internal 63kΩ pull-up and 120ns minimum pulse width tolerance, and a dedicated power-fail comparator (PFI/PFO) with 1.25V threshold and 4mV hysteresis. Its reset generator guarantees low-state assertion for ≥200ms after VCC rises above VRST or MR transitions high.
Battery switchover operates via dual PMOS switches: VCC-to-OUT path (5Ω typical on-resistance) engages when VCC > VRST; BATT-to-OUT path (80Ω typical) activates only when VCC < VRST and VCC < VBATT. The device remains fully functional with VCC = 0V if VBATT ≥ 2.0V, enabling true zero-voltage backup operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - triggers reset when VCC falls below this level; optimized for +5V systems with looser tolerance margin. |
| Reset Timeout Period | 200ms typical - ensures µP remains held in reset long enough to stabilize clocks and peripherals after power recovery. |
| Quiescent Supply Current | 11µA typical - enables multi-year battery life in always-on portable instrumentation and memory backup applications. |
| Manual Reset Pulse Width | 120ns minimum - supports clean reset initiation from fast digital logic without external debouncing. |
| Battery Switchover Threshold | VCC − VBATT < −20mV - prevents oscillation during brownout by enforcing hysteresis before switching to backup power. |
| Power-Fail Input Threshold | 1.25V ±5mV - provides accurate low-battery or auxiliary supply monitoring independent of VCC regulation. |
| Supply Voltage Range | VCC: +4.5V to +5.5V; VBATT: 2.0V to +6.0V - allows direct connection to Li-ion, coin-cell, or supercapacitor sources. |
Pinout & Package
MAX819MCPA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), compatible with space-constrained portable designs and offering thermal performance suitable for industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT based on voltage comparison; delivers up to 250mA with <0.25V dropout in VCC mode. |
| 2 VCC | +5V main supply input | Primary power rail; powers internal circuitry and enables VCC-to-OUT switch; monitored for reset generation. |
| 3 GND | Ground reference | 0V return for all analog and digital functions; must be low-impedance for stable reset threshold accuracy. |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input drops below 1.25V - usable for low-battery warning. |
| 5 PFO | Power-fail comparator output | Open-drain output; pulled high internally during reset timeout; can drive MR on same device to trigger reset on supply failure. |
| 6 WDI | Watchdog timer input | Not present on MAX819 - pin is no-connect; confirmed by Selector Guide and functional diagram (Figure 1). |
| 7 RESET | Active-low reset output | Push-pull output; sinks 3.2mA / sources 800µA; guaranteed low for 200ms after VCC rise or MR release. |
| 8 BATT | Backup battery input | Accepts 2.0–6.0V source; connects to OUT via 80Ω switch when VCC < VRST and VCC < VBATT; leakage <1nA in standby. |
| - MR | Manual reset input | Active-low input with internal 63kΩ pull-up; accepts TTL/CMOS levels; initiates 200ms reset pulse on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Integrated 63kΩ pull-up enables switch-only reset implementation; 120ns pulse rejection prevents noise-induced resets. |
| Power-Fail Comparator (PFI/PFO) | Independent 1.25V threshold circuit allows monitoring of secondary supplies (e.g., 3.3V rails) without affecting reset behavior. |
| Battery Freshness Seal | Disables BATT leakage (<1nA) until first power cycle; preserves shelf life of coin-cell backups in shipped products. |
| VCC-to-OUT Switching | 5Ω on-resistance PMOS switch ensures <0.25V dropout at 50mA - critical for maintaining RAM retention voltage. |
| Reset Timing Guarantee | 200ms timeout is production-tested and temperature-compensated (±10% over −40°C to +85°C). |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time sensor data during AC power loss. IC Role / Device Role / Timing Role: Supervises +5V rail, asserts RESET on brownout, and seamlessly switches RAM supply from VCC to coin-cell via OUT pin. Use Value: Prevents data corruption during 100ms–500ms grid interruptions; 11µA quiescent current extends 3V CR2032 life to >5 years. |
Use Scenario: Remote I/O node operating in factory environments with unstable 24VDC field power. IC Role / Device Role / Timing Role: Monitors local +5V regulator output; triggers controlled µP reset on undervoltage; uses PFI to detect 24V supply sag. Use Value: Eliminates need for discrete voltage monitor + reset IC + power switch - reduces BOM count by 3 components. |
| Smart Energy Meters | Point-of-Sale Terminals |
|
Use Scenario: AMI meter storing tariff data and consumption logs during utility outages. IC Role / Device Role / Timing Role: Provides battery-backed RAM supply (via OUT), detects mains failure via PFI, and initiates secure shutdown via RESET. Use Value: Enables full data integrity across >10,000 power cycles; freshness seal ensures 10-year backup battery shelf life pre-deployment. |
Use Scenario: Credit card terminal using supercapacitor backup during brief AC dropouts. IC Role / Device Role / Timing Role: Switchover control between 5V DC adapter and 5.5V supercap; MR pin enables cashier-initiated hard reset. Use Value: Supports 10-second backup runtime with <1% voltage droop; manual reset avoids firmware hang without rebooting entire system. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX819CSA+ | Same functionality and specs, but in 8-pin SO package (4.9mm × 6.0mm) instead of µMAX (3mm × 3mm). | SO package offers easier hand-soldering and higher thermal mass; less suitable for ultra-compact PCB layouts. | Select MAX819CSA+ when board assembly uses reflow-only processes or requires higher creepage/clearance. |
| MAX692AESA+ | Includes watchdog timer (1.6s timeout) and power-fail comparator, but lacks manual reset input and battery freshness seal. | Used where continuous µP activity monitoring is required, but manual intervention and long-term battery preservation are not needed. | Choose MAX692AESA+ only if watchdog supervision is mandatory and MR functionality is omitted from system design. |
Compared with MAX819MCPA+, MAX819CSA+ offers identical electrical behavior in a larger, more manufacturable package, while MAX692AESA+ trades manual reset and battery seal for integrated watchdog - making it unsuitable for applications requiring operator-initiated recovery or extended shelf life.
Availability
MAX819MCPA+ 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 with guaranteed long-term availability and traceable sourcing.
Supply support for MAX819MCPA+ 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, automotive, and computing applications.
The MAX817/MAX818/MAX819 product line was designed specifically for +5V microprocessor systems needing compact, low-power supervisory functions-including reset generation, battery backup, and power-fail detection-with minimal external components.
FAQ
What is the reset threshold voltage for MAX819MCPA+?
The MAX819MCPA+ has a factory-trimmed reset threshold of 4.40V ±10%, specified for +5V systems. This value is tested and guaranteed across the full operating temperature range (−40°C to +85°C) and appears in the Electrical Characteristics table under VRST parameter. The "M" suffix in MAX819MCPA+ explicitly denotes the 4.40V version, distinguishing it from the 4.65V "L" variant.
Does MAX819MCPA+ include a watchdog timer?
No, MAX819MCPA+ does not include a watchdog timer. According to the Selector Guide and Functional Diagram (Figure 1), watchdog input (WDI) is absent on MAX819 devices. Pin 6 is a no-connect. Watchdog functionality is exclusive to MAX817 and MAX818 variants. This omission simplifies system design where software-level watchdog supervision is handled externally.
How does the battery freshness seal work on MAX819MCPA+?
The battery freshness seal on MAX819MCPA+ disconnects the BATT pin from internal circuitry until first power-up, reducing standby leakage to <1nA. To enable it: ground PFO, bring VCC above 4.40V and hold until RESET deasserts, then cycle VCC low. Once enabled, the seal remains active until next full power cycle - preserving coin-cell shelf life for up to 10 years pre-deployment.
Can MAX819MCPA+ operate with VCC = 0V?
Yes, MAX819MCPA+ remains fully functional with VCC = 0V if VBATT ≥ 2.0V (per Absolute Maximum Ratings and Electrical Characteristics notes). In this state, OUT is powered from BATT, RESET remains valid (low if VBATT > 1V), and PFI/PFO continue monitoring - enabling true zero-voltage backup operation for RAM retention and fault logging.
What is the maximum load current supported by the OUT pin of MAX819MCPA+?
The OUT pin of MAX819MCPA+ supports up to 250mA continuous output current when sourced from VCC (per Absolute Maximum Ratings), with typical VCC-to-OUT on-resistance of 5Ω. When sourced from BATT, the limit is 50mA continuous (per Absolute Maximum Ratings), with 80Ω typical BATT-to-OUT on-resistance - sufficient for powering SRAM, RTCs, and small logic banks.
MAX819MCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX819MCPA+ FAQ
1.How can I place an order for MAX819MCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819MCPA+ 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 MAX819MCPA+ reliable?
The price and inventory of MAX819MCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819MCPA+ is usually 5 days.
3.What payment methods are accepted for MAX819MCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819MCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819MCPA+?
MAX819MCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819MCPA+ 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 MAX819MCPA+?
For technical support, including MAX819MCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819MCPA+ requirements.
6.How does Aetrix verify that MAX819MCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX819MCPA+ 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 MAX819MCPA+ meets industry standards.
7.What is the process for return or replacement of MAX819MCPA+?
All MAX819MCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX819MCPA+, 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 MAX819MCPA+ part is unused and in its original packaging.
Return procedure for MAX819MCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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