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Analog Devices Inc./Maxim Integrated MAX806RCSA+
- Part No.:
- MAX806RCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806RCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:138
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Product details
Overview
MAX806RCSA+ 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-designed for reliable power monitoring in embedded controllers and battery-powered systems.
For engineers reviewing the MAX806RCSA+ datasheet, MAX806RCSA+ pinout, MAX806RCSA+ application, or MAX806RCSA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases in RAM backup and brownout protection, and validated alternative parts for supply-chain continuity and design flexibility.
Technical Context
The MAX806RCSA+ integrates a precision reset comparator with ±2% tolerance on the 2.625V threshold, a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switch enabling VOUT to seamlessly transition between VCC and VBATT when VCC falls below 2.40V (VSW) - all while supporting battery voltages exceeding VCC. It operates across –40°C to +85°C (E-grade) in 8-pin SO package.
Its PFI input monitors external supplies at 1.237V with 10mV hysteresis, and its active-high RESET output requires external pull-up; MR input provides manual reset with internal 70µA pull-up and 200ms deassertion delay. The device guarantees RESET assertion down to VCC = 1V and draws only 40µA from VCC under typical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (R-suffix), ±2% tolerance - ensures reliable reset assertion before 3.0V system drops below 2.59V critical retention level. |
| Reset Timeout Period | 200ms (typical), 140–280ms range - provides sufficient hold time for µP initialization after power stabilization. |
| Watchdog Timeout | 1.6s (typical), 1.12–2.24s range - detects µP lockup without requiring software intervention or external timing components. |
| VCC Supply Current | 40µA (typ), ≤65µA max at VCC < 5.5V - enables ultra-low-power operation in always-on battery-backed systems. |
| Battery Supply Current | 0.4–1µA (E-grade) - minimizes drain on lithium coin cells during extended backup mode. |
| VBATT-to-VOUT On-Resistance | 140Ω (typ) - limits voltage drop during switchover, preserving ≥2.0V for CMOS RAM data retention. |
| Power-Fail Input Threshold | 1.237V ±20mV - supports accurate undervoltage detection of auxiliary rails via resistor divider. |
Pinout & Package
MAX806RCSA+ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant (indicated by '+' suffix), with 1.27mm pitch and standard JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches automatically between VCC and VBATT; connects to VBATT (via 140Ω p-MOSFET) when VCC < 2.40V, ensuring uninterrupted RAM power. |
| 2 - VCC | Main supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables VOUT connection to VCC above reset threshold. |
| 3 - GND | Ground reference | Common return path for VCC, VBATT, and all logic signals; must be low-impedance for noise immunity. |
| 4 - PFI | Power-fail input | Compares external voltage to 1.237V reference; asserts PFO low when input falls below threshold - used for auxiliary rail monitoring. |
| 5 - PFO | Power-fail output | Active-low open-drain signal; indicates PFI undervoltage or VCC dropout - can drive MR on compatible devices (e.g., MAX704/MAX806). |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer on each transition; timeout triggers RESET if no activity for 1.6s. |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX802 RESET; requires external pull-up to VCC; asserts high for 200ms on power-up/brownout/watchdog fault. |
| 8 - VBATT | Backup-battery input | Accepts up to 6.0V; remains isolated from VOUT until VCC drops below VSW; enables lithium cells (e.g., 3.6V) to exceed VCC safely. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, preventing µP execution from corrupted memory or invalid state. |
| Battery-backup switchover with VCC < VBATT support | Enables use of standard 3.6V lithium batteries without level-shifting, extending backup runtime while avoiding overvoltage damage. |
| 200ms reset timeout with restart-on-brownout | Re-initializes reset timing on every VCC dip below threshold - eliminates race conditions during noisy or unstable power ramp-up. |
| 1.6s watchdog timer with edge-triggered clear | Eliminates need for periodic software "kick"; tolerates µP glitches or brief stalls without false triggering. |
| 1.237V PFI comparator with 10mV hysteresis | Provides stable undervoltage detection on auxiliary rails (e.g., analog sensors, I/O supplies) without external hysteresis components. |
Applications
| Battery-Backed Embedded Controller | RAM Data Retention System |
|---|---|
|
Use Scenario: Industrial PLC retains configuration and process history during mains failure using a 3.6V lithium cell. IC Role / Device Role / Timing Role: MAX806RCSA+ monitors 3.0V system rail and switches VOUT from VCC to VBATT within 1µs of VCC falling below 2.40V. Use Value: Guarantees ≥2.0V to SRAM for >10 years at +25°C, with <1µA battery leakage, eliminating data loss during extended outages. |
Use Scenario: Portable medical monitor stores patient vitals in static RAM during battery swap. IC Role / Device Role / Timing Role: MAX806RCSA+ asserts RESET high only after VCC stabilizes above 2.625V and holds for 200ms - preventing premature µP boot. Use Value: Synchronizes RAM write completion and µP reset release, eliminating partial-write corruption during hot-swap events. |
| Critical µP Power Monitoring | Intelligent Instrument Supervision |
|
Use Scenario: Aerospace telemetry unit must survive 100ms VCC transients without spurious reset. IC Role / Device Role / Timing Role: MAX806RCSA+ rejects negative-going VCC glitches ≤40µs at 100mV overdrive - per Figure 7 timing spec. Use Value: Prevents unnecessary reboots during engine ignition noise or EMI bursts, maintaining continuous data logging integrity. |
Use Scenario: Handheld multimeter uses watchdog to recover from display controller lockup. IC Role / Device Role / Timing Role: MAX806RCSA+ monitors WDI toggling from µP firmware; triggers RESET if no edge occurs within 1.6s. Use Value: Restores instrument responsiveness without user intervention, meeting IEC 61000-4-2 immunity requirements for field-deployed tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX806RCSA | Same functionality and pinout, but leaded (non-RoHS) version - lacks '+' RoHS compliance marking. | No difference in circuit behavior; unsuitable for RoHS-mandated production programs. | Select MAX806RCSA+ for new designs requiring lead-free compliance; MAX806RCSA only for legacy repair or non-regulated markets. |
| MAX806TESA+ | Identical architecture and package, but 3.075V reset threshold (T-suffix) instead of 2.625V (R-suffix). | Designed for 3.3V ±5% systems; not suitable where brownout margin must extend down to 2.59V. | Choose MAX806RCSA+ when supervising 3.0V rails with ±10% tolerance; use MAX806TESA+ for tighter 3.3V systems. |
Compared with MAX806RCSA and MAX806TESA+, the MAX806RCSA+ uniquely combines R-suffix 2.625V reset accuracy, RoHS compliance, and E-grade temperature range - making it the only option qualified for industrial battery-backed applications requiring both low-threshold brownout detection and regulatory conformance.
Availability
MAX806RCSA+ is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and intelligent instruments requiring stable component supply across industrial temperature ranges and long-term lifecycle support.
Supply support for MAX806RCSA+ 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, automotive, and computing applications.
The MAX806RCSA+ belongs to Maxim's microprocessor supervisory circuit family, engineered specifically for robust power monitoring and battery-switchover in 3.0V/3.3V µP systems operating under harsh thermal and voltage conditions.
FAQ
What is the reset threshold voltage of the MAX806RCSA+?
The MAX806RCSA+ has a nominal reset threshold voltage of 2.625V (R-suffix), with ±2% tolerance over temperature and supply variations. This value is specified for VCC falling and rising conditions per the Electrical Characteristics table, ensuring reliable assertion before VCC drops below 2.59V - critical for 3.0V systems with ±10% tolerance.
Does the MAX806RCSA+ support battery voltages higher than VCC?
Yes, the MAX806RCSA+ explicitly supports VBATT exceeding VCC - a key feature for lithium coin-cell backup (e.g., 3.6V) in 3.0V/3.3V systems. Its internal battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT through a 140Ω p-MOSFET, with no risk of backfeed or latch-up.
What is the function of the WDI pin on the MAX806RCSA+?
The WDI (Watchdog Input) pin on the MAX806RCSA+ is edge-sensitive: each rising or falling transition clears the internal 1.6s watchdog timer. If no edge occurs within that window, RESET is asserted. Unlike some predecessors, the watchdog cannot be disabled - ensuring fail-safe µP supervision in safety-critical applications.
How does the MAX806RCSA+ handle power-fail detection?
The MAX806RCSA+ uses its PFI pin to monitor external supplies against a precise 1.237V reference. When PFI falls below this threshold - or when VCC drops below 2.40V - the open-drain PFO pin pulls low. This signal can directly drive MR on compatible supervisors or trigger µP interrupts, enabling multi-rail fault detection without additional comparators.
Is the RESET output of the MAX806RCSA+ push-pull or open-drain?
The RESET output of the MAX806RCSA+ is active-high and open-drain, requiring an external pull-up resistor to VCC. This matches the MAX704/MAX806 series architecture and allows wired-OR connection with other reset sources - unlike the active-low push-pull RESET found in MAX690/MAX802 variants.
MAX806RCSA+ 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:
- 2.625V
- 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
MAX806RCSA+ FAQ
1.How can I place an order for MAX806RCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806RCSA+ 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 MAX806RCSA+ reliable?
The price and inventory of MAX806RCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806RCSA+ is usually 5 days.
3.What payment methods are accepted for MAX806RCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806RCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806RCSA+?
MAX806RCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806RCSA+ 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 MAX806RCSA+?
For technical support, including MAX806RCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806RCSA+ requirements.
6.How does Aetrix verify that MAX806RCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX806RCSA+ 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 MAX806RCSA+ meets industry standards.
7.What is the process for return or replacement of MAX806RCSA+?
All MAX806RCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806RCSA+, 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 MAX806RCSA+ part is unused and in its original packaging.
Return procedure for MAX806RCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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