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Analog Devices Inc./Maxim Integrated MAX806SEPA+
- Part No.:
- MAX806SEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX806SEPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:367
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Product details
Overview
MAX806SEPA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 2.925V reset threshold, 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover. It monitors VCC for brownout detection, asserts reset during power-up/down, and switches VOUT to VBATT when VCC falls below 2.40V-enabling reliable CMOS RAM retention in portable controllers.
For engineers reviewing the MAX806SEPA+ datasheet, MAX806SEPA+ pinout, MAX806SEPA+ application, or MAX806SEPA+ equivalent, key selection criteria include reset threshold tolerance (±2%), battery leakage current (≤1µA), PFI comparator accuracy (±2%), VCC supply current (40µA at VCC < 3.6V), and guaranteed RESET assertion down to VCC = 1V.
Technical Context
The MAX806SEPA+ integrates a precision reset comparator with 10mV hysteresis, a non-disableable 1.6s watchdog timer cleared by WDI edges, and a dual-path power-switching circuit: a 3Ω PMOS switch connects VCC to VOUT during normal operation, while a 140Ω switch engages VBATT-to-VOUT when VCC drops below VSW (2.40V) and VBATT > VCC.
Its PFI input monitors external supplies with 1.237V threshold and ±2% accuracy; PFO asserts low on power-fail or VCC undervoltage. MR input features internal 70µA pull-up and guarantees 200ms reset hold after release. RESET is open-drain and requires external pull-up for active-high logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (VCC falling), ±2% tolerance - ensures reset assertion before 3.3V supply drops below 2.85V system minimum. |
| Reset Timeout Period | 200ms (typical) - provides sufficient deassertion delay for µP initialization after stable VCC recovery. |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables ultra-low-power operation in battery-backed embedded systems. |
| Battery Supply Current | ≤1µA (max, TA = −40°C to +85°C) - minimizes backup battery drain during extended standby. |
| Watchdog Timeout | 1.6s (typ) - detects µP lockup without requiring software intervention or external timing components. |
| PFI Threshold Accuracy | ±2% - supports precise monitoring of auxiliary rails (e.g., 5V or analog supplies) via resistor divider. |
| VBATT-to-VOUT On-Resistance | 140Ω (typ) - limits voltage drop during battery switchover, preserving ≥2.0V for CMOS RAM data retention. |
Pinout & Package
MAX806SEPA+ 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 | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω switch); must be decoupled with 0.1µF capacitor. |
| 2 - VCC | Main supply input | Operates from 2.72V to 5.5V; powers internal circuitry and enables VCC-to-VOUT path above VSW. |
| 3 - GND | Ground reference | Common return for all analog/digital functions; requires low-inductance connection to system ground plane. |
| 4 - PFI | Power-fail input | Monitors external rail via resistor divider; triggers PFO low when voltage falls below 1.237V ±2%. |
| 5 - PFO | Power-fail output | Active-low open-drain signal; can drive MR input on MAX704/MAX806 to generate cascaded reset. |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer; tied high/low causes 1.6s timeout and reset assertion. |
| 7 - RESET | Active-high reset output | Open-drain, requires external pull-up to VCC; asserts high during reset condition (VCC < VRST or WDI timeout). |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; connects to VOUT only when VCC < VSW and VBATT > VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, critical for systems with unregulated input stages. |
| Battery-backup switchover with 2.40V threshold | Enters battery mode before VOUT drops below 2.0V, preserving CMOS RAM data integrity without external logic. |
| 200ms reset timeout with restart-on-brownout | Each VCC dip below VRST restarts the timer, preventing premature µP execution during unstable supply conditions. |
| 1.6s watchdog timer with edge-triggered clear | Eliminates need for periodic software "kick"; hardware-level fault recovery independent of firmware state. |
| 40µA VCC supply current (VCC < 3.6V) | Reduces quiescent power in always-on subsystems, extending battery life in portable instrumentation. |
Applications
| Battery-Powered Portable Controllers | Embedded Industrial Data Loggers |
|---|---|
Use Scenario: Handheld test equipment powered by lithium coin cell with intermittent µP wake-up cycles. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, RAM backup switchover, and watchdog supervision during sleep/wake transitions. Use Value: 1µA max battery leakage preserves 10+ year shelf life; 2.925V reset threshold aligns with 3.3V LDO dropout voltage. |
Use Scenario: Remote sensor node logging temperature/humidity to SPI flash, operating on 3.3V regulated supply with supercap backup. IC Role / Device Role / Timing Role: Power supervisor asserting reset on supply sag, enabling clean µP reboot and flash write abort before corruption. Use Value: 200ms reset timeout prevents spurious reboots from transient noise; PFI monitors 5V sensor rail for early warning. |
| Critical µP Power Monitoring in Medical Devices | Intelligent Instrumentation with RAM Retention |
Use Scenario: Portable ECG monitor requiring guaranteed µP reset on any VCC dip below 2.9V to prevent misdiagnosis. IC Role / Device Role / Timing Role: Safety-critical reset generator with ±2% threshold accuracy and 1V min VCC operation. Use Value: Guaranteed RESET assertion down to VCC = 1V eliminates risk of undefined µP behavior during rapid power collapse. |
Use Scenario: Digital multimeter storing calibration coefficients and user settings in battery-backed SRAM. IC Role / Device Role / Timing Role: Dual-supply manager switching VOUT from VCC to 3.6V lithium battery when main supply fails. Use Value: 140Ω VBATT-to-VOUT switch resistance maintains ≥2.2V at SRAM VDD under 100µA load, ensuring data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX804SEPA+ | Active-low RESET output (push-pull), identical reset threshold (2.925V), same pinout and timing. | Requires inverted reset logic interface; not suitable for µPs needing active-high reset with external pull-up. | Select MAX804SEPA+ only if system design uses active-low reset signaling and no external pull-up is desired. |
| MAX706SEPA+ | No watchdog timer, no battery switchover, 2.63V reset threshold, lower supply current (25µA). | Lacks RAM backup and fault-detection redundancy; suited for cost-sensitive, non-battery-backed applications. | Choose MAX706SEPA+ when watchdog and battery backup are unnecessary and lowest possible quiescent current is prioritized. |
Compared with MAX804SEPA+, MAX806SEPA+ provides active-high reset compatibility with standard µP interfaces; versus MAX706SEPA+, it adds essential reliability features-watchdog supervision and seamless battery switchover-for mission-critical portable systems.
Availability
MAX806SEPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded industrial data loggers, and intelligent instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX806SEPA+ 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 consumer systems.
The MAX806SEPA+ belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered specifically for robust power monitoring, RAM backup, and watchdog supervision in portable and battery-critical embedded applications.
FAQ
What is the reset threshold voltage for MAX806SEPA+?
The MAX806SEPA+ has a nominal reset threshold of 2.925V (VCC falling), with ±2% tolerance over temperature. This value is fixed by the 'S' suffix in the part number and ensures reset assertion before the 3.3V supply drops below 2.85V, aligning with typical 3.3V LDO dropout specifications. The threshold is guaranteed across the full operating temperature range of −40°C to +85°C.
Does MAX806SEPA+ include a watchdog timer, and can it be disabled?
Yes, MAX806SEPA+ includes a 1.6s watchdog timer that cannot be disabled. It clears on any rising or falling edge at the WDI pin and triggers reset if WDI remains static beyond timeout. This hardwired behavior ensures fail-safe supervision even if firmware fails to service the watchdog-a key reliability feature absent in simpler supervisors like MAX706SEPA+.
How does the battery switchover function work on MAX806SEPA+?
MAX806SEPA+ switches VOUT from VCC to VBATT when VCC falls below 2.40V (VSW) and VBATT exceeds VCC. A 140Ω internal switch connects VBATT to VOUT, maintaining ≥2.0V for CMOS RAM retention. When VCC recovers above the 2.925V reset threshold, VOUT reconnects to VCC via a 3Ω PMOS switch-ensuring stable power resumption without glitch.
What is the function of the PFI and PFO pins on MAX806SEPA+?
PFI is a dedicated input for monitoring auxiliary power rails (e.g., 5V or analog supplies) using a resistor divider; it compares against a 1.237V ±2% internal reference. PFO is an active-low open-drain output that asserts when PFI falls below threshold or VCC drops below VSW. PFO can drive the MR input on MAX704SEPA+/MAX806SEPA+ to generate cascaded reset events.
Is MAX806SEPA+ pin-compatible with other devices in the MAX80x family?
Yes, MAX806SEPA+ shares identical 8-pin PDIP/SO packaging and pinout with MAX802SEPA+, MAX804SEPA+, and MAX805SEPA+. Key differences lie in RESET polarity (active-high vs. active-low), presence of MR input (absent in MAX802/MAX805), and PFI/PFO functionality-making direct substitution possible only when matching functional requirements and interface logic levels.
MAX806SEPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX806SEPA+ FAQ
1.How can I place an order for MAX806SEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806SEPA+ 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 MAX806SEPA+ reliable?
The price and inventory of MAX806SEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806SEPA+ is usually 5 days.
3.What payment methods are accepted for MAX806SEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806SEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806SEPA+?
MAX806SEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806SEPA+ 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 MAX806SEPA+?
For technical support, including MAX806SEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806SEPA+ requirements.
6.How does Aetrix verify that MAX806SEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX806SEPA+ 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 MAX806SEPA+ meets industry standards.
7.What is the process for return or replacement of MAX806SEPA+?
All MAX806SEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806SEPA+, 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 MAX806SEPA+ part is unused and in its original packaging.
Return procedure for MAX806SEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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