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Analog Devices Inc./Maxim Integrated MAX806SCSA+T
- Part No.:
- MAX806SCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806SCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MAX806SCSA+T from Maxim Integrated is a 3.3V/3.0V 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-designed for reliable power monitoring in embedded controllers and battery-powered systems.
For engineers reviewing the MAX806SCSA+T datasheet, MAX806SCSA+T pinout, MAX806SCSA+T application, or MAX806SCSA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed operating conditions (VCC = 3.02V–5.5V, TA = 0°C to +70°C), and real-world design implications for brownout recovery, RAM backup, and power-fail warning.
Technical Context
The MAX806SCSA+T integrates a precision reset comparator with ±2% threshold tolerance, a dedicated watchdog timer that triggers reset on 1.6s WDI inactivity, and a bidirectional battery switchover circuit enabling VBATT > VCC operation. Its PFI/PFO pair provides independent power-fail detection with 1.237V threshold and 10mV hysteresis.
It features dual supply monitoring: VCC supervision down to 1V (guaranteed RESET assertion), and VBATT supervision supporting lithium cells up to 3.6V. The internal 70µA MR pull-up enables direct switch interface without external components, and the 40µA VCC supply current ensures low-power operation in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (±2%) - precisely targets 3.3V ±10% supplies; asserts before VCC falls below 2.85V to prevent µP corruption. |
| Reset Timeout | 200ms (140–280ms over temp) - ensures stable µP initialization after power-up or brownout recovery. |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects firmware hangs without requiring software refresh; non-disableable. |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables multi-year battery life in portable equipment with continuous supervision. |
| Battery Leakage | 0.01–0.5µA - minimizes self-discharge of backup lithium cells during long-term storage or standby. |
| VBATT Switch Threshold | VSW = 2.40V (2.30–2.50V) - initiates switchover to battery before VOUT drops below 2.0V, preserving CMOS RAM data. |
| PFI Threshold | 1.237V (±25mV) - supports accurate undervoltage detection on auxiliary rails via external resistor divider. |
Pinout & Package
MAX806SCSA+T is housed in an 8-pin SOIC package (SO, 150mil width), RoHS-compliant (indicated by '+' suffix), with standard JEDEC MS-012AC outline and 90-0096 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC and VBATT; connects to VCC when VCC > VRST, to VBATT when VCC < VSW and VBATT > VCC. |
| 2 - VCC | Main system supply input | Operates from 3.02V to 5.5V; powers internal circuitry and sources VOUT when active; RESET asserted below 2.925V. |
| 3 - GND | Ground reference | Common return for all analog and digital functions; substrate tied to higher of VCC/VBATT (must be floated in hybrid designs). |
| 4 - PFI | Power-fail input | Monitors auxiliary rail via external divider; asserts PFO low when voltage falls below 1.237V; hysteresis prevents noise-induced toggling. |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC < VSW; can drive MR on MAX704/MAX806 to trigger system reset. |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); clears internal 1.6s timer on transition; reset triggered if static for >1.6s. |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX704 RESET; requires external pull-up; asserts high during reset, deasserts after 200ms timeout. |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; enables seamless switchover to battery; may exceed VCC (e.g., 3.6V Li-cell with 3.3V rail). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownouts, critical for systems with unregulated inputs or aging batteries. |
| Battery-backup switchover with 140Ω on-resistance | Minimizes voltage drop (<100mV at 1mA) during battery mode, preserving RAM retention voltage margin. |
| 200ms reset time delay with temperature stability | Remains within 140–280ms across –40°C to +85°C, eliminating need for external timing components. |
| 40µA VCC supply current (typ) | Reduces quiescent load on primary supply, extending runtime in always-on IoT sensors and portable instruments. |
| Manual reset with internal 70µA pull-up | Supports direct connection to momentary switch (no external resistor), simplifying PCB layout and BOM. |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
Use Scenario: A handheld multimeter uses a 3.3V µP and lithium coin cell for memory retention during main power removal. IC Role / Device Role / Timing Role: MAX806SCSA+T monitors VCC, asserts RESET on brownout, switches VOUT to VBATT at 2.40V, and maintains RAM power until battery depletion. Use Value: Prevents data loss during battery swaps and extends usable backup time by minimizing leakage (0.5µA max). |
Use Scenario: A portable gas detector operates from rechargeable Li-ion and must retain calibration data across power cycles. IC Role / Device Role / Timing Role: MAX806SCSA+T provides 200ms power-on reset, watchdog supervision of sensor firmware, and PFI-based low-battery warning via PFO interrupt. Use Value: Eliminates need for discrete reset IC + watchdog + power-fail comparator, reducing board area by >40%. |
| Critical µP Power Monitoring | RAM Backup System for Industrial PLC |
Use Scenario: An industrial controller requires deterministic reset behavior during 12V-to-3.3V DC-DC converter transients. IC Role / Device Role / Timing Role: MAX806SCSA+T rejects sub-40µs VCC glitches (100mV overdrive), asserts RESET only on sustained undervoltage, and guarantees assertion down to VCC = 1V. Use Value: Avoids spurious resets during switching noise, improving system uptime and diagnostic reliability. |
Use Scenario: A programmable logic controller retains configuration EEPROM and SRAM using a 3.6V lithium backup. IC Role / Device Role / Timing Role: MAX806SCSA+T connects VBATT to VOUT via low-Ron PMOS switch, isolates VCC/VBATT paths, and disables PFI comparator during battery mode. Use Value: Enables safe hot-swap of backup battery while VCC remains valid, with no risk of RESET assertion. |
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; 2.93V reset threshold (±2.5%); 1.6µA battery current. | Suitable for simpler reset-only systems without firmware hang detection; lacks WDI and PFO-driven MR capability. | Select when watchdog functionality is unnecessary and lowest possible battery drain is required. |
| MAX802SCSA+ | Active-low RESET (push-pull); identical reset threshold (2.925V) and watchdog; no PFO output. | Used where active-low reset signaling is mandatory (e.g., legacy µP interfaces); omits power-fail warning function. | Select when system requires guaranteed active-low reset drive strength and PFI monitoring is not needed. |
Compared with MAX706SCSA+ and MAX802SCSA+, the MAX806SCSA+ uniquely combines active-high open-drain RESET, integrated watchdog, and PFO-driven reset triggering-making it optimal for new designs requiring full-feature supervision with flexible reset polarity and auxiliary rail monitoring.
Availability
MAX806SCSA+T is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply, RoHS compliance, and long-term manufacturability.
Supply support for MAX806SCSA+T 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 analog, mixed-signal, and power-management ICs for industrial, computing, and communications applications.
The MAX806SCSA+T belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered to replace discrete reset, watchdog, and battery-switch circuits in space-constrained, low-power embedded systems.
FAQ
What is the exact reset threshold voltage for MAX806SCSA+T?
The MAX806SCSA+T has a nominal reset threshold of 2.925V, with ±2% tolerance over temperature and supply voltage. This value is specified for both VCC rising and falling edges (2.88V min / 3.00V max), ensuring consistent brownout detection in 3.3V ±10% systems. The threshold is factory-trimmed and guaranteed per datasheet Electrical Characteristics table.
Does MAX806SCSA+T support battery voltage higher than VCC?
Yes, MAX806SCSA+T explicitly supports VBATT exceeding VCC - such as a 3.6V lithium cell on a 3.3V rail. Its battery switchover circuit activates when VCC falls below VSW (2.40V typical), connecting VBATT to VOUT through a 140Ω internal switch. The device tolerates VBATT up to +6.0V, and substrate biasing accommodates the voltage differential.
How does the watchdog timer in MAX806SCSA+T operate?
The MAX806SCSA+T watchdog timer has a fixed 1.6s timeout (1.12–2.24s over temperature). It clears on any WDI edge (rising or falling) and triggers RESET if WDI remains static beyond timeout. Unlike some variants, the watchdog cannot be disabled - it operates continuously once powered, providing fail-safe firmware supervision without configuration overhead.
Can MAX806SCSA+T be used without a backup battery?
Yes, MAX806SCSA+T can operate without a backup battery: connect VBATT and VOUT directly to VCC. However, battery-related functions (switchover, low-leakage backup) are then inactive. For pure reset/watchdog applications without battery support, alternatives like MAX706T/S/R may offer lower cost or quiescent current, but MAX806SCSA+T remains fully functional.
What is the function of the PFI and PFO pins on MAX806SCSA+T?
PFI is a dedicated input for monitoring auxiliary power rails via external resistor divider; it compares against a 1.237V internal reference. PFO is its open-drain output, driven low when PFI < 1.237V or VCC < VSW. On MAX806SCSA+T, PFO can be connected to MR to generate a system reset on auxiliary rail failure - a key differentiator versus reset-only supervisors.
MAX806SCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX806SCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806SCSA+T 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+T reliable?
The price and inventory of MAX806SCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806SCSA+T is usually 5 days.
3.What payment methods are accepted for MAX806SCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806SCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806SCSA+T?
MAX806SCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806SCSA+T 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+T?
For technical support, including MAX806SCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806SCSA+T requirements.
6.How does Aetrix verify that MAX806SCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX806SCSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX806SCSA+T?
All MAX806SCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX806SCSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX806SCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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