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Analog Devices Inc./Maxim Integrated MAX806REPA+
- Part No.:
- MAX806REPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX806REPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:204
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Product details
Overview
MAX806REPA+ 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. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and switches CMOS RAM to VBATT when VCC falls below 2.40V - used in embedded controllers and portable equipment requiring reliable power-up sequencing and data retention.
For engineers reviewing the MAX806REPA+ datasheet, MAX806REPA+ pinout, MAX806REPA+ application, or MAX806REPA+ equivalent, key selection criteria include reset threshold accuracy (±2%), battery leakage current (≤1µA), VCC supply current (40µA typ), watchdog timeout tolerance (±40%), and compatibility with lithium coin-cell backup sources in industrial temperature range (–40°C to +85°C).
Technical Context
The MAX806REPA+ integrates a precision reset comparator with 2.625V nominal threshold (±2% tolerance), a 1.6s watchdog timer that clears on WDI edge transitions, and a bidirectional battery switchover circuit with 140Ω VBATT-to-VOUT on-resistance and 3Ω VCC-to-VOUT PMOS switch. Its PFI input features 1.237V threshold (±25mV) and 10mV hysteresis for external power-fail detection.
It operates across VCC = 2.72V to 5.5V and supports battery voltages up to 6.0V. The device guarantees RESET assertion down to VCC = 1.0V and provides guaranteed logic-level outputs: RESET (open-drain, VOL ≤ 0.3V @ 1.2mA), PFO (push-pull, VOH ≥ VCC–0.3V), and VOUT (regulated to VCC–0.015V @ 5mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2% (VCC rising); ensures reset assertion before VCC drops below 2.59V in 3.0V systems |
| Reset Timeout Period | 200ms (140–280ms over temp); guarantees stable µP initialization after power-up or brownout |
| VCC Supply Current | 40µA typical (VCC < 3.6V); enables ultra-low-power operation in battery-backed systems |
| Battery Supply Current | ≤1µA (–40°C to +85°C); minimizes lithium cell drain during long-term backup mode |
| Watchdog Timeout | 1.6s ±40% (1.12–2.24s); detects µP lockup without requiring software intervention |
| Power-Fail Input Threshold | 1.237V ±25mV; supports accurate monitoring of auxiliary rails via external resistor divider |
| Operating Temperature | –40°C to +85°C (E-grade); qualified for industrial embedded applications |
Pinout & Package
MAX806REPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and RoHS-compliant lead-free finish (+ suffix). Pin spacing conforms to JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS) based on VCC/VBATT comparison; connects to RAM VDD |
| 2 - VCC | Main system supply input | Primary power source (2.72–5.5V); powers internal circuitry and enables VOUT sourcing when above reset threshold |
| 3 - GND | Ground reference | Common return path for all analog/digital functions; substrate tied to higher of VCC or VBATT |
| 4 - PFI | Power-fail comparator input | Monitors auxiliary rail via external divider; triggers PFO low when voltage falls below 1.237V |
| 5 - PFO | Power-fail output | Active-low push-pull signal; can be wired to MR on MAX704/MAX806 to generate secondary reset |
| 6 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); resets watchdog timer on transition; cannot be disabled |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX802 RESET; requires external pull-up; drives µP reset I/O directly |
| 8 - VBATT | Backup battery input | Accepts 3.6V lithium cell; may exceed VCC; enables seamless RAM backup during main supply failure |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures reliable reset signaling even during deep brownout conditions where VCC collapses below 2.0V |
| Battery-backup switchover at VSW = 2.40V | Triggers RAM power transfer before VOUT drops below 2.0V, preserving CMOS RAM data integrity |
| 40µA VCC supply current (typ) | Reduces quiescent load on primary supply, extending battery life in portable instrumentation |
| 1µA max battery supply current | Minimizes self-discharge of lithium coin cells, supporting >10-year backup runtime in low-duty-cycle systems |
| 200ms reset timeout with restart-on-brownout | Prevents premature µP release during transient dips; internal timer resets each time VCC falls below VRST |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
Use Scenario: Industrial handheld meter with real-time clock and nonvolatile RAM powered by single 3.0V lithium battery. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and automatic RAM backup switchover. Use Value: Guarantees µP starts in known state at power-up; preserves RAM contents for >10 years using 3.6V coin cell; eliminates need for external reset generator or discrete power-switching circuitry. |
Use Scenario: Battery-operated environmental sensor node with sleep/wake cycles and flash memory logging. IC Role / Device Role / Timing Role: System monitor asserting reset on supply collapse and enabling watchdog recovery from firmware hangs. Use Value: 1.6s watchdog timeout detects stuck firmware without host intervention; 200ms reset pulse ensures full µP initialization; 40µA quiescent current extends operational life between charges. |
| Critical µP Power Monitoring | Portable Medical Diagnostic Device |
Use Scenario: Low-power medical controller requiring fail-safe boot sequence and data retention during AC power loss. IC Role / Device Role / Timing Role: Precision voltage supervisor with ±2% reset threshold tolerance and guaranteed assertion down to VCC = 1V. Use Value: Prevents execution of corrupted code during marginal supply conditions; meets IEC 60601-1 requirements for safe power-down behavior in Class II devices. |
Use Scenario: Portable ultrasound probe with embedded ARM processor and SRAM-based image buffer. IC Role / Device Role / Timing Role: Dual-role supervisor managing both main supply integrity and battery-backed memory retention. Use Value: Seamless VCC→VBATT switchover at 2.40V preserves SRAM image buffers during hot-swap battery replacement; PFI input monitors auxiliary 5V rail for transducer bias supply failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX806SEPA+ | 2.925V reset threshold (±2%), identical pinout and feature set | Suitable for 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 |
| MAX806TEPA+ | 3.075V reset threshold (±2%), same package and electrical specs | Optimized for 3.3V ±5% supplies; asserts reset earlier than R-suffix during falling VCC | Choose for tighter-tolerance 3.3V rails where reset must trigger before VCC drops below 3.0V |
Compared with MAX806SEPA+ and MAX806TEPA+, the MAX806REPA+ offers the lowest reset threshold (2.625V), making it optimal for 3.0V systems with wider supply tolerances and extended brownout resilience - critical where main supply may dip near 2.6V without immediate failure.
Availability
MAX806REPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across industrial temperature ranges and long-term lifecycle support.
Supply support for MAX806REPA+ 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 high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications.
The MAX806REPA+ belongs to Maxim's microprocessor supervisory circuit family, engineered specifically for robust power-monitoring and data-retention in 3.0V/3.3V embedded systems with battery backup - emphasizing precision reset thresholds, ultra-low quiescent current, and seamless switchover reliability.
FAQ
What is the exact reset threshold voltage of the MAX806REPA+?
The MAX806REPA+ has a nominal reset threshold of 2.625V with ±2% tolerance over temperature (–40°C to +85°C). This value applies to VCC rising; the falling threshold is 2.55V min, ensuring reset remains asserted until VCC recovers above 2.635V. The R-suffix explicitly denotes this 2.625V variant within the MAX806 family.
Does the MAX806REPA+ support manual reset functionality?
No - the MAX806REPA+ does not include a manual reset (MR) input. Unlike the MAX704/MAX806 variants with MR pin, the MAX806REPA+ omits MR (pin 6 is WDI only). Manual reset capability is present only in MAX704REPA+ and MAX806REPA+ derivatives; the MAX806REPA+ relies solely on power-supply monitoring and watchdog-triggered reset.
How does the battery switchover work on the MAX806REPA+?
The MAX806REPA+ switches VOUT from VCC to VBATT when VCC falls below 2.40V (VSW) and VBATT exceeds VCC, or when VCC drops below 1.75V regardless of VBATT. Switchover uses a 140Ω NMOS switch from VBATT to VOUT. Recovery to VCC occurs only after VCC rises above the 2.625V reset threshold - ensuring stable supply before disconnecting backup.
Can the MAX806REPA+ drive a standard CMOS µP reset input directly?
Yes - the MAX806REPA+ features an active-high open-drain RESET output (pin 7) compatible with most µP reset I/O pins. It requires an external pull-up resistor (typically 4.7kΩ to VCC) and sinks ≤0.3V at 1.2mA. For bidirectional µP reset pins (e.g., Motorola 68HC11), a series 4.7kΩ resistor isolates contention between MAX806REPA+ and µP drivers.
What is the maximum allowable VCC transient duration that will not trigger reset on the MAX806REPA+?
At 100mV overdrive (i.e., VCC falling 100mV below 2.625V), the MAX806REPA+ tolerates negative-going transients up to 40µs without issuing a reset pulse. Immunity decreases with larger overdrive: a 200mV dip allows only ~10µs. A 0.1µF bypass capacitor at VCC improves noise rejection per datasheet recommendations.
MAX806REPA+ 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:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX806REPA+ FAQ
1.How can I place an order for MAX806REPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806REPA+ 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 MAX806REPA+ reliable?
The price and inventory of MAX806REPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806REPA+ is usually 5 days.
3.What payment methods are accepted for MAX806REPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806REPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806REPA+?
MAX806REPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806REPA+ 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 MAX806REPA+?
For technical support, including MAX806REPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806REPA+ requirements.
6.How does Aetrix verify that MAX806REPA+ is sourced from the original manufacturer or authorized distributors?
All MAX806REPA+ 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 MAX806REPA+ meets industry standards.
7.What is the process for return or replacement of MAX806REPA+?
All MAX806REPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806REPA+, 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 MAX806REPA+ part is unused and in its original packaging.
Return procedure for MAX806REPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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