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Analog Devices Inc./Maxim Integrated MAX806SCPA+
- Part No.:
- MAX806SCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX806SCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
MAX806SCPA+ from Maxim Integrated is a 3.3V/3.0V microprocessor supervisory circuit with active-high open-drain RESET output, 2.925V reset threshold (S-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for reliable power monitoring in embedded controllers and battery-powered systems.
For engineers reviewing the MAX806SCPA+ datasheet, MAX806SCPA+ pinout, MAX806SCPA+ application, or MAX806SCPA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in RAM backup and brownout protection, and validated alternative parts for design continuity.
Technical Context
The MAX806SCPA+ integrates a precision reset comparator with ±2% threshold accuracy (2.925V nominal, VCC rising), a 1.6s watchdog timer with edge-triggered clear, and a bidirectional battery switchover circuit that connects VBATT to VOUT when VCC falls below 2.40V (VSW) while ensuring CMOS RAM retention down to 2.0V. It operates across 0°C to +70°C in 8-pin PDIP.
Its dual-supply architecture supports VCC = 2.88V–5.5V and VBATT up to 6.0V, with guaranteed RESET assertion down to VCC = 1.0V and battery leakage current as low as 0.4µA. The PFI input provides independent power-fail detection at 1.237V with 10mV hysteresis, decoupled from reset logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (±2% tolerance, VCC rising); ensures reset asserts before supply drops below 2.85V in 3.3V ±10% systems. |
| Reset Timeout Period | 200ms (140–280ms over temperature); guarantees µP remains held in reset long enough for stable power recovery. |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp); detects µP lockup without requiring software intervention or external timing components. |
| VCC Supply Current | 40µA typical (VCC < 3.6V); enables ultra-low-power operation in always-on battery-backed applications. |
| Battery Supply Current | 0.4–1.0µA (max); minimizes drain on lithium coin cells during extended backup mode. |
| VBATT-to-VOUT On-Resistance | 140Ω typical; limits voltage drop during switchover to preserve RAM data integrity under load. |
| PFO Threshold Accuracy | ±2% (1.237V nominal); supports precise undervoltage detection for auxiliary rails or battery monitoring. |
Pinout & Package
MAX806SCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and through-hole mounting. Pin spacing is 0.100", lead finish is lead-free (RoHS-compliant), and thermal resistance is 9.09mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT via internal PMOS; maintains RAM voltage during brownout. |
| 2 - VCC | Main system supply input | Accepts 2.88V–5.5V; powers internal circuitry and determines reset assertion level. |
| 3 - GND | Ground reference | Common return for all analog/digital functions; must be low-impedance for noise immunity. |
| 4 - PFI | Power-fail input | Monitors external rail via voltage divider; triggers PFO low when input falls below 1.237V. |
| 5 - PFO | Power-fail open-drain output | Signals undervoltage condition; can be tied to MR on MAX704/MAX806 to generate reset. |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); clears 1.6s timer on transition; cannot be disabled. |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX704 RESET; requires external pull-up; asserts high for 200ms on fault. |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; enables seamless switchover without diode loss. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures reliable reset hold during deep brownout or slow power ramp-down, critical for nonvolatile memory safety. |
| Battery-backup switchover with 2.40V threshold | Activates backup before VOUT drops below 2.0V, preserving CMOS RAM data without external circuitry. |
| 200ms reset timeout with restart-on-brownout | Prevents premature µP release during transient dips; timer resets each time VCC falls below threshold. |
| 1.6s watchdog timer with edge-triggered clear | Eliminates need for periodic software refresh; responds to any µP activity (not just toggles), reducing firmware overhead. |
| 40µA VCC supply current (typ) | Extends battery life in portable equipment where supervisory ICs remain powered continuously. |
Applications
| Battery-Powered Embedded Controller | RAM Data Retention System |
|---|---|
Use Scenario: Industrial sensor node operating on lithium coin cell with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and manages switchover to backup battery during sleep-mode brownouts. Use Value: Prevents RAM corruption during 100ms–500ms power interruptions; extends usable battery life by limiting VCC current to 40µA. |
Use Scenario: Medical device storing calibration data in static RAM during AC power loss. IC Role / Device Role / Timing Role: Provides VOUT switchover at 2.40V and holds RESET until VCC stabilizes post-recovery. Use Value: Guarantees RAM voltage stays ≥2.0V for >10 seconds using 3.6V Li-cell; eliminates need for external diode or regulator. |
| Critical µP Power Monitoring | Intelligent Instrumentation |
Use Scenario: Programmable logic controller with watchdog-dependent firmware safety routines. IC Role / Device Role / Timing Role: Generates 200ms active-high RESET pulse on power-up and 1.6s watchdog timeout. Use Value: Ensures deterministic µP initialization and automatic recovery from infinite loops without manual intervention. |
Use Scenario: Handheld multimeter with real-time clock and configuration storage. IC Role / Device Role / Timing Role: Monitors both main supply and RTC battery via PFI; asserts PFO on low-battery warning. Use Value: Enables early battery replacement alert using same 1.237V comparator; avoids unexpected shutdown during measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCPA+ | No watchdog timer; only RESET and PFI/PFO functions; 2.93V reset threshold (±2.5%). | Suitable for simpler systems where µP lockup detection is handled in firmware or not required. | Select MAX706SCPA+ when watchdog functionality is unnecessary and BOM cost reduction is prioritized. |
| MAX802SCPA+ | Active-low RESET output (push-pull); identical reset threshold, timeout, and battery switchover specs. | Requires redesign of reset net if µP expects active-high signal; no change to power-fail or watchdog behavior. | Choose MAX802SCPA+ only when interfacing with µPs mandating active-low reset assertion and no external inversion. |
Compared with MAX706SCPA+, MAX806SCPA+ adds essential watchdog supervision for autonomous recovery; compared with MAX802SCPA+, it provides native active-high reset compatibility-reducing external component count and simplifying interface to modern µPs with dedicated reset inputs.
Availability
MAX806SCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instrumentation requiring stable component supply and long-term industrial availability.
Supply support for MAX806SCPA+ 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 management, sensing, and connectivity in industrial, medical, and automotive systems.
The MAX806SCPA+ belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered specifically for robust power monitoring, battery backup, and watchdog supervision in space-constrained, low-power embedded applications.
FAQ
What is the reset threshold voltage for MAX806SCPA+?
The MAX806SCPA+ has a nominal reset threshold of 2.925V with ±2% tolerance (VCC rising). This value is confirmed in the Electrical Characteristics table for MAX806S variants and ensures reliable reset assertion before VCC falls below 2.85V in 3.3V ±10% systems. The S-suffix explicitly denotes this threshold variant.
Does MAX806SCPA+ include a watchdog timer, and how does it operate?
Yes, MAX806SCPA+ includes a 1.6s watchdog timer (1.12–2.24s over temperature) that cannot be disabled. It clears on any rising or falling edge at WDI and triggers RESET if no edge occurs within timeout. Unlike older families, this watchdog is fully integrated and requires no external components.
How does the battery switchover function work on MAX806SCPA+?
MAX806SCPA+ switches VOUT from VCC to VBATT when VCC falls below 2.40V (VSW) and VBATT > VCC, using a 140Ω internal switch. Switchover back to VCC occurs only after VCC rises above the 2.925V reset threshold-ensuring stable supply before disconnecting backup power.
What is the function of the RESET pin on MAX806SCPA+?
The RESET pin on MAX806SCPA+ is an active-high, open-drain output-distinct from the active-low RESET on MAX690/MAX704. It requires an external pull-up resistor and asserts high for 200ms during power-up, brownout, or watchdog timeout, directly compatible with µPs expecting active-high reset signals.
Can MAX806SCPA+ monitor a secondary power supply?
Yes, MAX806SCPA+ can monitor a secondary supply using the PFI input. With a resistor divider, PFI detects voltages relative to its 1.237V threshold (±2%). When PFI falls below this level, PFO goes low-enabling interrupt generation or connection to MR on MAX704/MAX806 to trigger reset.
MAX806SCPA+ 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:
- 2.925V
- 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
MAX806SCPA+ FAQ
1.How can I place an order for MAX806SCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806SCPA+ 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 MAX806SCPA+ reliable?
The price and inventory of MAX806SCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806SCPA+ is usually 5 days.
3.What payment methods are accepted for MAX806SCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806SCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806SCPA+?
MAX806SCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806SCPA+ 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 MAX806SCPA+?
For technical support, including MAX806SCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806SCPA+ requirements.
6.How does Aetrix verify that MAX806SCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX806SCPA+ 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 MAX806SCPA+ meets industry standards.
7.What is the process for return or replacement of MAX806SCPA+?
All MAX806SCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806SCPA+, 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 MAX806SCPA+ part is unused and in its original packaging.
Return procedure for MAX806SCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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