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Analog Devices Inc./Maxim Integrated MAX806RCPA+
- Part No.:
- MAX806RCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX806RCPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:466
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Product details
Overview
MAX806RCPA+ from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 2.625V reset threshold (R-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 MAX806RCPA+ datasheet, MAX806RCPA+ pinout, MAX806RCPA+ application, or MAX806RCPA+ equivalent, this page delivers verified functional specifications, validated pin roles, confirmed operating conditions (VCC = 2.72V–5.5V, TA = 0°C to +70°C), and real-world substitution guidance for industrial and portable µP systems.
Technical Context
The MAX806RCPA+ integrates a precision reset comparator with ±2% threshold tolerance (2.625V rising/falling), a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switchover circuit enabling VBATT > VCC operation with 140Ω VBATT-to-VOUT on-resistance and 3Ω VCC-to-VOUT switch.
It features an active-high open-drain RESET output (inverse of MAX690/MAX704 series), manual reset input (MR) with 70µA internal pull-up, power-fail comparator (VPFT = 1.237V, ±20mV hysteresis), and guaranteed RESET assertion down to VCC = 1V-supporting brownout recovery and CMOS RAM retention during supply dips.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (±2%) - precise brownout detection for 3.0V systems with 10% supply tolerance |
| Reset Timeout Period | 200ms (140–280ms) - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s (1.12–2.24s) - monitors µP activity; reset triggered if WDI remains static |
| VCC Supply Current | 40–50µA (VCC < 3.6V) - ultra-low quiescent current for battery longevity |
| Battery Supply Current | 0.4–1µA - minimal drain during backup mode, preserving lithium cell life |
| Power-Fail Threshold | 1.237V (±20mV hysteresis) - accurate undervoltage warning for auxiliary rails |
| Operating Temperature | 0°C to +70°C - commercial-grade stability for non-automotive embedded use |
Pinout & Package
MAX806RCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body, RoHS-compliant lead-free finish (+ suffix), and standard through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS); supports battery-backed memory retention |
| 2 - VCC | Main supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables VOUT sourcing when above reset threshold |
| 3 - GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC/VBATT |
| 4 - PFI | Power-fail input | Monitors external rail via voltage divider; asserts PFO low when input falls below 1.237V |
| 5 - PFO | Power-fail output | Active-low open-drain signal indicating supply fault or VCC drop below switchover threshold (VSW = 2.40V) |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets internal 1.6s timer; cannot be disabled |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX704 RESET; requires external pull-up; asserts high during reset condition |
| 8 - VBATT | Backup-battery input | Accepts up to 6.0V; connects to VOUT when VCC < VSW (2.40V) or < 1.75V; enables >VCC battery operation |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, critical for data integrity in RAM-backed systems |
| Battery-backup switchover with VBATT > VCC support | Enables use of 3.6V lithium cells without level-shifting; eliminates need for external diode or regulator |
| 200ms reset timeout with restart-on-threshold-violation | Prevents premature µP execution during unstable supply recovery; re-triggers if VCC dips again mid-timer |
| 1.6s watchdog timer with edge-clearing logic | Eliminates false resets from noise; only responds to sustained WDI inactivity-not glitches or transients |
| ±2% reset and power-fail threshold accuracy | Tighter tolerance than MAX690/MAX704 (±4%), enabling robust margining in 3.0V ±10% applications |
Applications
| Battery-Powered Embedded Controllers | Critical µP Power Monitoring |
|---|---|
Use Scenario: Portable medical device with ARM Cortex-M0+ MCU and SRAM retaining calibration data during battery swaps. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, watchdog supervision, and seamless VBATT-to-VCC switchover for RAM backup. Use Value: Prevents firmware corruption during 3.0V supply sag; extends battery life via 0.4µA backup current; guarantees reset until VCC ≥ 2.625V. |
Use Scenario: Industrial PLC CPU module requiring deterministic reset behavior during AC line sags and generator transitions. IC Role / Device Role / Timing Role: Primary power supervisor asserting RESET for 200ms after each VCC dip below 2.625V, with independent PFI monitoring of 5V auxiliary rail. Use Value: Eliminates need for discrete RC reset circuits; ±2% threshold ensures consistent trip point across temperature; PFO alerts host µP of secondary supply failure. |
| Intelligent Instrumentation | Portable Test Equipment |
Use Scenario: Handheld multimeter with EEPROM configuration storage and real-time clock powered by coin cell. IC Role / Device Role / Timing Role: Dual-role supervisor: generates reset pulse on power-up and manages battery switchover to preserve RTC/SRAM during main battery depletion. Use Value: 2.625V threshold matches 3.0V Li-ion discharge curve; 140Ω VBATT switch minimizes voltage drop to RTC; MR input enables front-panel hard reset. |
Use Scenario: Battery-operated oscilloscope probe interface with FPGA configuration stored in SRAM. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor ensuring FPGA reconfiguration if firmware hangs; RESET output drives FPGA PROG_B pin. Use Value: 1.6s watchdog timeout aligns with typical FPGA boot time; active-high RESET simplifies direct connection to Xilinx/Altera PROG_B; 40µA VCC current extends runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX806SCPA+ | 2.925V reset threshold (±2%), identical pinout and feature set | Targeted at 3.3V ±10% systems instead of 3.0V ±10%; higher trip point delays reset assertion | Select when system VCC nominal is 3.3V and brownout margin must exceed 2.9V |
| MAX806TCPA+ | 3.075V reset threshold (±2%), same package and timing | Designed for 3.3V ±5% supplies; asserts reset earlier than R-suffix under marginal conditions | Choose for tighter 3.3V systems where 3.075V trip avoids nuisance resets near 3.1V |
Compared with MAX806RCPA+, the S- and T-suffix variants maintain identical watchdog, switchover, and PFI functionality but shift reset threshold to match different supply tolerances-enabling precise selection without PCB redesign or layout change.
Availability
MAX806RCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, intelligent instrumentation, critical µP power monitoring, and portable equipment requiring stable component supply and long-term lifecycle support.
Supply support for MAX806RCPA+ 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, computing, and consumer systems.
The MAX806RCPA+ belongs to Maxim's µP supervisory family optimized for 3.0V/3.3V systems, delivering integrated reset, watchdog, and battery switchover to replace discrete solutions in space-constrained embedded designs.
FAQ
What is the exact reset threshold voltage for MAX806RCPA+ and how tightly is it specified?
The MAX806RCPA+ has a nominal reset threshold of 2.625V, with a guaranteed tolerance of ±2% over temperature and supply variations. This means the actual trip point falls between 2.573V and 2.678V (VCC rising), enabling precise brownout protection for 3.0V systems with ±10% supply tolerance. The tight tolerance distinguishes MAX806RCPA+ from earlier MAX690-series parts (±4%).
Does MAX806RCPA+ support battery voltage higher than VCC, and what is the maximum allowed VBATT?
Yes, MAX806RCPA+ explicitly supports VBATT exceeding VCC-enabling direct connection of 3.6V lithium batteries to the VBATT pin while VCC operates at 3.0V or 3.3V. The absolute maximum rating for VBATT is +6.0V, and the internal switchover circuit activates when VCC drops below 2.40V (VSW), connecting VBATT to VOUT through a 140Ω switch.
What is the function of the RESET pin on MAX806RCPA+, and how does it differ from MAX690-series parts?
The RESET pin on MAX806RCPA+ is an active-high, open-drain output-the inverse of the active-low RESET found on MAX690/MAX704 devices. It requires an external pull-up resistor to VCC and asserts high during reset conditions (power-up, brownout, watchdog timeout, or MR activation). This simplifies interfacing with µPs that expect active-high reset signals, such as certain ARM and RISC-V cores.
Can the watchdog timer in MAX806RCPA+ be disabled, and what triggers its timeout?
No, the watchdog timer in MAX806RCPA+ cannot be disabled. It times out after 1.6 seconds (1.12–2.24s over temperature) if the WDI pin remains static (high or low). The timer clears on any edge transition (rising or falling) at WDI, allowing software to "kick" it by toggling the pin. Reset is asserted immediately upon timeout, and the timer remains cleared while RESET is active.
What are the key differences between MAX806RCPA+ and MAX704RCPA+ in terms of reset output and threshold accuracy?
MAX806RCPA+ provides an active-high open-drain RESET output, whereas MAX704RCPA+ delivers active-low RESET. Additionally, MAX806RCPA+ specifies ±2% reset threshold accuracy versus ±4% for MAX704RCPA+, making it more suitable for applications demanding tighter voltage-margin control in 3.0V systems. Both share identical watchdog, switchover, and PFI functionality.
MAX806RCPA+ 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:
- -
- 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
MAX806RCPA+ FAQ
1.How can I place an order for MAX806RCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806RCPA+ 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 MAX806RCPA+ reliable?
The price and inventory of MAX806RCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806RCPA+ is usually 5 days.
3.What payment methods are accepted for MAX806RCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806RCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806RCPA+?
MAX806RCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806RCPA+ 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 MAX806RCPA+?
For technical support, including MAX806RCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806RCPA+ requirements.
6.How does Aetrix verify that MAX806RCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX806RCPA+ 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 MAX806RCPA+ meets industry standards.
7.What is the process for return or replacement of MAX806RCPA+?
All MAX806RCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806RCPA+, 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 MAX806RCPA+ part is unused and in its original packaging.
Return procedure for MAX806RCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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