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Analog Devices Inc./Maxim Integrated MAX806SCSA+
- Part No.:
- MAX806SCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806SCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
MAX806SCSA+ from Maxim Integrated is a 3.3V/3.0V microprocessor supervisory circuit with active-high open-drain RESET output, manual reset input (MR), watchdog timer (1.6s timeout), precision voltage monitoring (2.925V reset threshold), and battery-backup switchover - designed for reliable power-up/down/brownout detection in embedded controllers and battery-powered systems.
For engineers reviewing the MAX806SCSA+ datasheet, MAX806SCSA+ pinout, MAX806SCSA+ application, or MAX806SCSA+ equivalent, this page delivers verified specifications, validated pin functions, confirmed operating conditions (0°C to +70°C, SO-8 package), and real-world design context for µP reset integrity, RAM backup, and power-fail warning in low-power industrial and portable electronics.
Technical Context
The MAX806SCSA+ integrates a precision reset comparator with ±2% threshold tolerance (2.925V nominal), a 200ms reset timeout timer, and a non-disableable watchdog circuit triggered by WDI edge transitions or static high/low states exceeding 1.6s. Its battery switchover logic uses dual thresholds: VSW = 2.40V (VBATT-to-VOUT switch-on) and VRST = 2.925V (VCC-to-VOUT reconnection).
It features separate power-fail detection (PFI/PFO) with 1.237V threshold and 10mV hysteresis, independent of reset logic; MR input includes internal 70µA pull-up; and VOUT supports CMOS RAM with <3Ω on-resistance when connected to VCC and ~140Ω when switched to VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (±2%) - ensures reset assertion before VCC drops below 2.85V in 3.3V ±10% systems |
| Reset Timeout Period | 200ms (140–280ms over temp) - guarantees minimum reset pulse width for µP initialization |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables ultra-low-power operation in battery-backed standby mode |
| Battery Supply Current | 0.4–1µA (max) - minimizes drain on lithium backup cells during extended hold-up periods |
| Power-Fail Threshold | 1.237V (±25mV) - provides accurate undervoltage detection for auxiliary rails or battery monitoring |
| Operating Temp Range | 0°C to +70°C - qualified for commercial-grade embedded controller applications |
Pinout & Package
MAX806SCSA+ is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix), and thermal performance rated at 471mW at +70°C (derating 5.88mW/°C above).
| 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 VSW and VRST thresholds |
| 2 - VCC | Main system supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables VOUT connection to VCC when above VRST |
| 3 - GND | Analog/digital ground reference | Common return for all internal comparators, timers, and output drivers; requires local 0.1µF decoupling |
| 4 - PFI | Power-fail input | Monitors external rail via resistor divider; asserts PFO low when voltage falls below 1.237V |
| 5 - PFO | Power-fail open-drain output | Active-low signal usable as interrupt or MR trigger (on MAX704/MAX806); requires external pull-up |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer; cannot be disabled - ties to µP I/O or GPIO |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX704 RESET; requires external pull-up to VCC for µP reset assertion |
| 8 - VBATT | Backup battery input | Supports VBATT > VCC (e.g., 3.6V Li cell); enables seamless RAM retention during main supply failure |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion down to VCC = 1V | Ensures fail-safe reset even during deep brownout - critical for data retention in volatile memory |
| Battery switchover with 2.40V VSW threshold | Triggers backup mode before VOUT drops below 2.0V - preserves CMOS RAM data integrity |
| 200ms reset timeout with restart-on-brownout | Each VCC dip below VRST restarts the timer - prevents premature µP release during unstable supply |
| 1.6s watchdog timer with edge-clearing | Eliminates need for dedicated watchdog service pulses - simplifies firmware design |
| Separate PFI/PFO with 10mV hysteresis | Enables robust auxiliary rail monitoring without interfering with primary reset functionality |
| 40µA VCC supply current (typ) | Extends battery life in always-on monitoring applications - e.g., smart sensors and portable instruments |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
Use Scenario: A handheld multimeter powered by two AA cells must retain calibration data and display state during battery replacement or low-voltage operation. IC Role / Device Role / Timing Role: MAX806SCSA+ monitors main 3.0V rail, switches VOUT to VBATT at 2.40V, asserts RESET to halt µP execution, and signals low-battery via PFO. Use Value: Guarantees RAM data retention down to 1V VCC and enables hot-swap battery operation without system reset or data loss. |
Use Scenario: An industrial pH meter operates from rechargeable Li-ion and requires continuous sensor logging during brief AC power interruptions. IC Role / Device Role / Timing Role: MAX806SCSA+ detects brownout on 3.3V DC-DC output, triggers 200ms RESET pulse, activates watchdog to verify µP responsiveness, and maintains RAM via VBATT. Use Value: Prevents corrupted log entries by halting writes during supply instability and preserving volatile buffer contents for recovery. |
| Critical µP Power Monitoring | Low-Power Remote Sensor Node |
Use Scenario: A PLC I/O module must guarantee deterministic boot sequence after cold start or power cycle, with immunity to sub-100mV/40µs VCC transients. IC Role / Device Role / Timing Role: MAX806SCSA+ provides precise 2.925V reset threshold, 200ms timeout, and glitch-immune comparator - asserting RESET only on sustained undervoltage. Use Value: Eliminates spurious resets caused by switching noise, ensuring reliable µP initialization in electrically noisy factory environments. |
Use Scenario: A wireless soil moisture sensor sleeps for hours between transmissions, waking periodically to sample and transmit data using minimal energy. IC Role / Device Role / Timing Role: MAX806SCSA+ remains in ultra-low-current mode (40µA) while monitoring VCC, asserts RESET on wake-up if supply is marginal, and uses PFI to monitor battery health. Use Value: Reduces average system current by >95% vs. discrete supervision solutions - extending 2-year battery life target. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA+ | No watchdog timer; active-low RESET; 2.63V reset threshold (S grade); 1.6µA battery current | Suitable for simpler reset-only systems without watchdog or battery switchover requirements | Select when watchdog and VBATT support are unnecessary - reduces BOM count and cost |
| MAX802SCSA+ | Active-low RESET (push-pull); identical 2.925V reset threshold and 200ms timeout; no PFO/PFI | Used where power-fail warning is not required and µP accepts active-low reset directly | Choose when system lacks need for auxiliary rail monitoring and prefers direct-drive RESET output |
Compared with MAX706SCSA+ and MAX802SCSA+, the MAX806SCSA+ uniquely combines active-high open-drain RESET, integrated watchdog, and full battery switchover - making it optimal for complex, battery-critical µP systems requiring both reliability and data persistence.
Availability
MAX806SCSA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, intelligent instruments, critical µP power monitoring, and portable equipment requiring stable component supply across commercial temperature range and long-term production continuity.
Supply support for MAX806SCSA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, computing, and consumer applications.
The MAX806SCSA+ belongs to Maxim's µP supervisory circuit family, engineered specifically for robust power monitoring and fail-safe reset generation in 3.0V/3.3V embedded systems with battery backup and watchdog safety requirements.
FAQ
What is the exact reset threshold voltage for MAX806SCSA+?
The MAX806SCSA+ has a nominal reset threshold voltage of 2.925V, with ±2% tolerance over temperature and supply variations. This value is specified for VCC falling conditions and ensures reset assertion before VCC drops below 2.85V in 3.3V ±10% systems. The threshold is guaranteed across the full 0°C to +70°C operating range and is tightly matched within the S-grade variant family.
Does MAX806SCSA+ include a watchdog timer, and can it be disabled?
Yes, the MAX806SCSA+ includes a 1.6s watchdog timer that monitors the WDI pin for edges or static states. Unlike earlier generations, this watchdog function cannot be disabled - it is always active. A reset is triggered if WDI remains high or low beyond 1.6s, and the timer clears on any rising or falling edge. This ensures continuous µP health monitoring without firmware dependency.
How does the battery switchover work on MAX806SCSA+?
The MAX806SCSA+ switches VOUT from VCC to VBATT when VCC falls below 2.40V (VSW) and VBATT exceeds VCC - enabling seamless RAM backup. Upon recovery, VOUT reconnects to VCC only after VCC rises above the 2.925V reset threshold, ensuring stable supply before switching. VBATT may exceed VCC (e.g., 3.6V Li cell), and the internal switch exhibits ~140Ω on-resistance in battery mode.
What is the function of the PFI and PFO pins on MAX806SCSA+?
PFI is a dedicated input for monitoring auxiliary power rails via a resistor divider; it compares against a 1.237V internal reference. When PFI falls below this threshold, PFO - an open-drain output - pulls low. PFO can drive interrupts or be tied to MR on compatible devices (e.g., MAX704/MAX806) to generate a system reset. Hysteresis is 10mV to reject noise.
Is MAX806SCSA+ pin-compatible with other parts in the MAX80x family?
Yes, MAX806SCSA+ shares identical SO-8 pinout and footprint with MAX802SCSA+, MAX804SCSA+, and MAX805SCSA+. All use the same VOUT/VCC/GND/PFI/PFO/WDI/RESET/VBATT assignment. However, RESET polarity differs: MAX806SCSA+ provides active-high open-drain, while MAX802/804/805 offer active-low variants - requiring schematic review before substitution.
MAX806SCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX806SCSA+ FAQ
1.How can I place an order for MAX806SCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806SCSA+ 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 MAX806SCSA+ reliable?
The price and inventory of MAX806SCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806SCSA+ is usually 5 days.
3.What payment methods are accepted for MAX806SCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806SCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806SCSA+?
MAX806SCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806SCSA+ 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 MAX806SCSA+?
For technical support, including MAX806SCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806SCSA+ requirements.
6.How does Aetrix verify that MAX806SCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX806SCSA+ 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 MAX806SCSA+ meets industry standards.
7.What is the process for return or replacement of MAX806SCSA+?
All MAX806SCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806SCSA+, 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 MAX806SCSA+ part is unused and in its original packaging.
Return procedure for MAX806SCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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