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Analog Devices Inc./Maxim Integrated MAX817MCPA+
- Part No.:
- MAX817MCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX817MCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,537
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Product details
Overview
The MAX817MCPA+ from Maxim Integrated is a +5V microprocessor supervisory circuit featuring active-low reset, battery backup switchover, and power-fail comparator functionality. It provides 4.40V reset threshold (M version), 200ms reset timeout, 11µA quiescent current, and operates in 0°C to +70°C temperature range. Designed for critical µP monitoring in portable battery-powered systems.
For engineers reviewing the MAX817MCPA+ datasheet, MAX817MCPA+ pinout, MAX817MCPA+ application, or MAX817MCPA+ equivalent, key selection criteria include reset threshold accuracy, battery switchover hysteresis, PFI/PFO comparator behavior, and compatibility with CMOS RAM backup requirements in embedded controllers and intelligent instruments.
Technical Context
The MAX817MCPA+ integrates a precision voltage monitor with ±10% tolerance (4.40V nominal), a 200ms internal reset timer, and a dedicated power-fail comparator with 1.25V threshold referenced to PFI. Its battery switchover circuit activates when VCC falls below both VRST and VBATT, connecting BATT to OUT via an 80Ω PMOS switch.
It supports backup-battery operation with sub-1µA standby current when VCC < VBATT − 0.2V, and includes a battery freshness seal enabled by grounding PFO during power cycling. Unlike MAX818/MAX819 variants, it lacks watchdog input and manual reset - confirming its identity as the base supervisory function variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - ensures reliable reset assertion during +5V supply brownout down to 4.5V minimum operating VCC |
| Reset Timeout Period | 200ms typical - guarantees µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 11µA typical - enables multi-year operation on coin-cell batteries in portable equipment |
| Power-Fail Threshold | 1.25V at PFI - allows configurable undervoltage detection for auxiliary supplies using external resistor divider |
| Battery Switchover | VCC-to-BATT transition at (VBATT − 0.2V) - prevents premature switchover and minimizes backup current draw |
| Operating Temp Range | 0°C to +70°C - validated for commercial-grade embedded controller and instrumentation environments |
| Package | 8-pin µMAX (3mm × 3mm) - space-constrained PCB layout compatible with portable and handheld designs |
Pinout & Package
MAX817MCPA+ uses an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad. Pin functions are electrically validated per Maxim's official datasheet Rev 3 (12/05).
| 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 during backup |
| 2 VCC | +5V main supply input | Primary power rail; monitored for reset generation and switchover control |
| 3 GND | Ground reference | 0V return for all internal circuits and external interface signals |
| 4 PFI | Power-fail comparator input | Accepts external voltage divider; asserts PFO low when input < 1.25V |
| 5 PFO | Power-fail comparator output | Open-drain output used for low-battery warning or MR triggering (on MAX819 only) |
| 6 WDI | Watchdog input | Not functional in MAX817 - internally disconnected; no watchdog timer present |
| 7 RESET | Active-low reset output | Drives µP reset pin low for ≥200ms after VCC rise or brownout recovery |
| 8 BATT | Backup battery input | Accepts 2.0V–5.5V battery; powers OUT and internal circuitry when VCC fails |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset monitor | ±10% threshold tolerance ensures robust brownout detection across full temperature range |
| Low 11µA quiescent current | Enables >10-year shelf life on CR2032 coin cell in always-on monitoring applications |
| Integrated power-fail comparator | 1.25V reference at PFI supports flexible undervoltage detection for secondary rails or battery monitoring |
| Battery switchover with hysteresis | 20mV hysteresis prevents oscillation during VCC/VBATT crossover near switchover point |
| Battery freshness seal support | PFO-grounding sequence enables OEMs to preserve backup battery charge until end-user first power-up |
Applications
| Battery-Powered Computers and Controllers | Embedded Controllers |
|---|---|
Use Scenario: Portable data logger powered by lithium coin cell with volatile SRAM requiring retention during main supply interruption. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to halt µP execution and switching OUT from VCC to BATT to sustain RAM voltage. Use Value: Prevents data corruption during brownout; extends operational uptime via seamless battery backup with <1µA standby draw. | Use Scenario: Industrial PLC module with nonvolatile configuration storage and real-time clock requiring fail-safe power management. IC Role / Device Role / Timing Role: Voltage monitor and switchover controller ensuring continuous RTC/SRAM power during AC loss or DC rail collapse. Use Value: Guarantees 200ms minimum reset hold time and eliminates need for discrete diode-OR and supervisor ICs. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with EEPROM calibration data and LCD display needing reliable startup sequencing. IC Role / Device Role / Timing Role: Power-on reset generator and PFI-based low-battery warning circuit signaling via PFO to MCU ADC input. Use Value: Enables accurate measurement integrity by preventing µP boot before supply stabilization and alerting user pre-failure. | Use Scenario: Medical diagnostic device where µP must never execute invalid code due to marginal supply conditions. IC Role / Device Role / Timing Role: Primary reset supervisor with 4.40V threshold aligned to +5V regulator tolerance band and fast transient immunity. Use Value: Meets IEC 60601 safety requirement for deterministic reset under 100µs transients up to 100mV overdrive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690ACPA+ | 4.65V reset threshold, no PFI/PFO comparator, 250ms reset timeout, higher 25µA supply current | Lacks power-fail warning capability; suitable only where undervoltage detection is handled externally | Select when strict 4.65V reset alignment is required and PFI functionality is unnecessary |
| TPS3808G12DBVR | 1.2V adjustable reset threshold (via external resistor), 360ms timeout, 2.5µA supply current, no battery switchover | Designed for low-voltage systems; cannot replace battery backup function of MAX817MCPA+ | Choose for ultra-low-power +3.3V or +1.8V µP systems without backup requirements |
Compared with MAX690ACPA+, MAX817MCPA+ offers lower quiescent current and integrated PFI/PFO for auxiliary supply monitoring; compared with TPS3808G12DBVR, it provides native +5V battery switchover but requires higher supply voltage and lacks programmable threshold flexibility.
Availability
MAX817MCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instruments requiring stable component supply across commercial temperature grades.
Supply support for MAX817MCPA+ 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, automotive, and computing markets.
The MAX817 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power monitoring, reset generation, and battery backup management in +5V µP systems with stringent low-power and space constraints.
FAQ
What is the reset threshold voltage of the MAX817MCPA+ and how is it trimmed?
The MAX817MCPA+ has a factory-trimmed reset threshold of 4.40V ±10%, designated by the "M" suffix. This value is laser-trimmed during production and specified over the full 0°C to +70°C operating range. The threshold is referenced to VCC and triggers RESET assertion when VCC falls below this level, with 25mV hysteresis to prevent chatter during slow supply decay.
Does the MAX817MCPA+ support watchdog timer functionality?
No, the MAX817MCPA+ does not include a watchdog timer. Watchdog input (WDI) and associated timing circuitry are absent in the MAX817 variant - confirmed by the Selector Guide and functional diagram. Only MAX818 and MAX819 include WDI; for watchdog capability, engineers must select MAX818MCPA+ or MAX819MCPA+ instead.
How does the battery switchover work on the MAX817MCPA+ and what are the voltage conditions?
The MAX817MCPA+ switches OUT from VCC to BATT when two conditions are met: VCC falls below the 4.40V reset threshold AND VCC drops below VBATT. Switchover occurs via an 80Ω internal PMOS switch. When VCC recovers above both thresholds, OUT reconnects to VCC. Battery leakage is limited to <1µA when VCC < VBATT − 0.2V, preserving shelf life.
Can the MAX817MCPA+ be used to monitor a secondary power rail such as +3.3V?
Yes, the MAX817MCPA+ can monitor secondary rails using its PFI/PFO comparator. By connecting a resistor divider from the +3.3V rail to PFI, the 1.25V internal reference allows trip-point configuration (e.g., R1=100kΩ, R2=68kΩ yields ~2.0V detection). PFO then asserts low to signal undervoltage - usable as interrupt or NMI input to the host µP, independent of the main VCC supervision path.
What is the purpose and activation method of the battery freshness seal on the MAX817MCPA+?
The battery freshness seal disables internal battery drain until first use. To enable it on MAX817MCPA+: (1) connect battery to BATT, (2) ground PFO, (3) power VCC above 4.40V and hold until RESET deasserts (~200ms), then (4) cycle VCC down. Once enabled, the seal remains active until next VCC power-up above threshold - ensuring full battery capacity at end-user deployment.
MAX817MCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX817MCPA+ FAQ
1.How can I place an order for MAX817MCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX817MCPA+ 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 MAX817MCPA+ reliable?
The price and inventory of MAX817MCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX817MCPA+ is usually 5 days.
3.What payment methods are accepted for MAX817MCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX817MCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX817MCPA+?
MAX817MCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX817MCPA+ 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 MAX817MCPA+?
For technical support, including MAX817MCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX817MCPA+ requirements.
6.How does Aetrix verify that MAX817MCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX817MCPA+ 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 MAX817MCPA+ meets industry standards.
7.What is the process for return or replacement of MAX817MCPA+?
All MAX817MCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX817MCPA+, 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 MAX817MCPA+ part is unused and in its original packaging.
Return procedure for MAX817MCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX817MCPA+ Tags
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MIC826SYMT-TR
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