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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 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,613
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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, 2.925V reset threshold (S-suffix), 200ms reset timeout, 1.6s watchdog timer, and battery-backup switchover capability. It monitors VCC for brownout detection, asserts reset during power-up/down, and supports CMOS RAM backup in portable controllers and embedded systems.
For engineers reviewing the MAX806SCSA datasheet, MAX806SCSA pinout, MAX806SCSA application, or MAX806SCSA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-powered µP systems, and validated alternative parts with documented functional differences.
Technical Context
The MAX806SCSA integrates a precision reset comparator with ±2% threshold tolerance (2.925V rising/falling), a non-disableable 1.6s watchdog timer cleared by WDI edges, and a dual-path power-switching circuit that connects VOUT to VBATT when VCC falls below 2.40V (VSW) - enabling seamless CMOS RAM backup without external diodes. Its PFI input accepts external voltage monitoring with 1.237V threshold and 10mV hysteresis.
Unlike MAX690/MAX704 variants, MAX806SCSA features an active-high open-drain RESET output (inverse of RESET), manual reset input (MR) with internal 70µA pull-up, and guaranteed RESET assertion down to VCC = 1V. It operates across –40°C to +85°C in SO-8 package with 40µA VCC supply current and 1µA battery leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (±2%) - precisely matches 3.3V ±10% supply tolerance; ensures reset before system instability at 2.85V |
| Reset Timeout Period | 200ms (140–280ms over temp) - provides sufficient deassertion delay for µP initialization after power stabilization |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup without requiring software intervention or external timing components |
| VCC Supply Current | 40µA (typ) at VCC < 3.6V - enables multi-year operation in battery-backed applications like portable instruments |
| Battery Leakage Current | 0.01–0.5µA - minimizes drain on lithium coin cells (e.g., CR2032) during long-term storage or standby |
| VBATT-to-VOUT On-Resistance | 140Ω (typ) - limits voltage drop under 1mA load, preserving >2.0V for reliable CMOS RAM data retention |
| PFO Threshold Accuracy | ±2% (1.237V ±24.7mV) - supports accurate secondary supply monitoring (e.g., analog rails) without calibration |
Pinout & Package
MAX806SCSA is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (denoted by '+' suffix in ordering code), and thermal performance rated for 471mW dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT via internal PMOS; delivers regulated backup power without external diode |
| 2 - VCC | Main system supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables reset assertion when falling below 2.925V |
| 3 - GND | Analog/digital ground reference | Common return for all internal comparators, timers, and outputs; must be low-impedance for noise immunity |
| 4 - PFI | Power-fail input | Monitors external rail via resistor divider; triggers PFO low when voltage drops below 1.237V |
| 5 - PFO | Power-fail open-drain output | Signals undervoltage condition; can drive MR 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 open-drain reset output | Inverse of RESET; requires external pull-up to VCC; drives µP reset pin directly in most 3.3V systems |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; may exceed VCC; enables switchover even when battery is 3.6V and VCC is 3.3V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset during deep brownout or battery depletion, preventing undefined µP behavior |
| Battery-backup switchover with 2.40V VSW threshold | Enters backup mode before VOUT drops below 2.0V, maximizing CMOS RAM data retention time |
| 1.6s watchdog timer with edge-triggered clear | Eliminates need for external watchdog IC; prevents µP lockup without software overhead or timer polling |
| ±2% reset and PFI threshold accuracy | Reduces design margin requirements and eliminates need for external trimming resistors in production |
| 40µA VCC supply current (typ) | Extends battery life in portable equipment; supports >10-year operation on CR2032 with intermittent wake-up |
Applications
| Battery-Powered Portable Controllers | Embedded Industrial Data Loggers |
|---|---|
|
Use Scenario: Handheld meter with lithium coin-cell backup and ARM Cortex-M0 µP. IC Role / Device Role / Timing Role: Supervises 3.3V main rail, asserts RESET on power-up/brownout, switches VOUT to VBATT during mains loss. Use Value: Guarantees µP starts in known state and preserves RAM contents for 72+ hours on CR2032 using 140Ω switchover switch. |
Use Scenario: Remote environmental sensor node operating on 3.0V Li-SOCl₂ battery with 10-year field life. IC Role / Device Role / Timing Role: Monitors VCC for gradual battery depletion; triggers PFO warning at 1.237V to initiate graceful shutdown. Use Value: Enables predictive maintenance via early low-battery alert while consuming only 40µA continuously. |
| Critical µP Power Monitoring in Medical Devices | Intelligent Instrumentation with Dual-Rail Monitoring |
|
Use Scenario: Portable ECG monitor requiring FDA-grade power reliability and zero data loss during battery swap. IC Role / Device Role / Timing Role: Generates 200ms RESET pulse on VCC dip; uses MR input for user-initiated self-test reset. Use Value: Meets IEC 62304 Class C requirements with deterministic reset timing and no external components needed. |
Use Scenario: Digital multimeter with separate 3.3V logic and 5V analog rails, needing independent fault detection. IC Role / Device Role / Timing Role: Uses PFI to monitor 5V rail via resistor divider; asserts RESET via PFO→MR linkage on analog supply failure. Use Value: Provides hardware-level cross-rail fault containment without firmware involvement or additional ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX806TCSA | Reset threshold 3.075V (±2%), higher trip point for 3.3V ±5% supplies | Suitable for systems where brownout must occur closer to nominal 3.3V, not 2.925V | Select MAX806TCSA when tighter supply tolerance mandates earlier reset assertion |
| MAX806RCSA | Reset threshold 2.625V (±2%), lower trip point optimized for 3.0V ±10% systems | Used in 3.0V designs where extended operation down to 2.59V is required before reset | Choose MAX806RCSA for legacy 3.0V µP platforms needing deeper brownout tolerance |
Compared with MAX806SCSA, MAX806TCSA raises reset initiation by 150mV for stricter 3.3V regulation, while MAX806RCSA lowers it by 300mV to accommodate wider 3.0V supply variation - all retain identical pinout, watchdog, and battery-switchover functionality.
Availability
MAX806SCSA is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded industrial data loggers, and critical µP power monitoring applications requiring stable component supply and long-term lifecycle support.
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, computing, and communications markets.
The MAX806SCSA belongs to Maxim's µP supervisory circuit family designed specifically for reliable power monitoring and battery backup in 3.0V/3.3V embedded systems - emphasizing low quiescent current, precise thresholds, and integrated switchover.
FAQ
What is the reset threshold voltage of the MAX806SCSA?
The MAX806SCSA has a nominal reset threshold of 2.925V with ±2% tolerance over temperature and supply voltage. This value applies to both VCC rising and falling conditions and is optimized for 3.3V ±10% power supplies. The S-suffix explicitly denotes this threshold variant, ensuring predictable reset behavior before VCC drops below 2.85V.
Does the MAX806SCSA support battery backup for CMOS RAM?
Yes, the MAX806SCSA supports battery backup via its VBATT pin and internal switchover circuit. When VCC falls below 2.40V (VSW), VOUT automatically connects to VBATT through a 140Ω switch, maintaining power to CMOS RAM. VBATT may exceed VCC (e.g., 3.6V lithium cell), and the device guarantees operation down to VCC = 1V while asserting RESET.
What is the function of the WDI pin on the MAX806SCSA?
The WDI (Watchdog Input) pin on the MAX806SCSA is edge-sensitive and clears the internal 1.6s watchdog timer on any rising or falling transition. If WDI remains static (high or low) for longer than 1.6s, the timer expires and triggers a RESET pulse. Unlike some supervisors, the watchdog cannot be disabled - providing fail-safe µP supervision without configuration overhead.
How does the MAX806SCSA differ from the MAX806TCSA and MAX806RCSA?
The MAX806SCSA, MAX806TCSA, and MAX806RCSA share identical pinout, package, watchdog, and battery-switchover functionality. They differ solely in reset threshold: 2.925V (S), 3.075V (T), and 2.625V (R). These variants target different supply tolerances - S for 3.3V ±10%, T for 3.3V ±5%, and R for 3.0V ±10% - enabling precise selection without redesign.
Can the MAX806SCSA be used without a backup battery?
Yes, but with modification: connect both VBATT and VOUT pins to VCC to disable switchover. However, this eliminates battery backup capability. For pure VCC-only supervision without backup, Maxim recommends alternatives like MAX706SCSA. Using MAX806SCSA without battery requires verifying that PFI/PFO and MR functions still meet system reset requirements.
MAX806SCSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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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