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Analog Devices Inc./Maxim Integrated MAX806RCSA+T
- Part No.:
- MAX806RCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806RCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,855
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Product details
Overview
MAX806RCSA+T 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. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and switches CMOS RAM to VBATT when VCC falls below 2.40V-used in embedded controllers requiring reliable power-fail detection and nonvolatile memory retention.
For engineers reviewing the MAX806RCSA+T datasheet, MAX806RCSA+T pinout, MAX806RCSA+T application, or MAX806RCSA+T equivalent, this page delivers verified electrical parameters, confirmed SO-8 package mapping, validated pin functions including MR and WDI, and real-world timing behavior under VCC transients and battery switchover conditions.
Technical Context
The MAX806RCSA+T integrates a precision reset comparator with ±2% threshold tolerance (2.625V rising/falling), a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power-switching architecture: VCC-to-VOUT via 3Ω PMOS switch and VBATT-to-VOUT via 140Ω NMOS switch activated when VCC < 2.40V. Its PFI input features 1.237V threshold with 10mV hysteresis for external power-rail monitoring.
RESET is open-drain and active-high-functionally inverse to the MAX690/MAX802 series-requiring external pull-up. The device guarantees RESET assertion down to VCC = 1V and supports manual reset via MR (70µA internal pull-up, 200ms deassertion delay), making it suitable for systems where µP reset I/O is bidirectional or shared with other peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2% (VCC rising/falling); ensures reset triggers before VCC drops below 2.59V in 3.0V ±10% systems. |
| Reset Timeout Period | 200ms (140–280ms over temperature); holds RESET asserted long enough to guarantee µP initialization completion. |
| Watchdog Timeout | 1.6s ±40% (1.12–2.24s); detects µP lockup without requiring software intervention or external components. |
| VCC Supply Current | 40–50µA (VCC < 3.6V); enables ultra-low-power operation in battery-backed portable equipment. |
| Battery Supply Current | 0.4–1µA (VBATT mode); minimizes drain on lithium backup cells during extended standby. |
| Power-Fail Input Threshold | 1.237V ±25mV; allows accurate monitoring of auxiliary rails (e.g., +5V, -5V) via resistor divider without loading. |
| VCC-to-VOUT On-Resistance | 3Ω (typ, 25°C); maintains low dropout and stable VOUT under 50mA load during main supply operation. |
Pinout & Package
MAX806RCSA+T is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix), and JEDEC MS-012AC outline.
| 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 VCC voltage vs. 2.40V switchover threshold. |
| 2 - VCC | Main system supply input | Accepts 2.72V–5.5V; powers internal circuitry and sources VOUT when above reset threshold. |
| 3 - GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC/VBATT per chip topology. |
| 4 - PFI | Power-fail comparator input | Monitors external rail via voltage divider; trips at 1.237V to assert PFO low for interrupt or MR-driven reset. |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI < 1.237V or VCC < 2.40V; can be wired to MR on MAX704/MAX806 for auto-reset. |
| 6 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); resets 1.6s timer on transition; no disable function-always active. |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX802 RESET; requires external pull-up; asserts high during reset, low otherwise. |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; supplies VOUT when VCC fails; may exceed VCC without damage or latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures reliable reset initiation even during deep brownout, critical for data retention in low-VCC states. |
| ±2% reset threshold tolerance | Tighter than MAX690/MAX704 (±4%), enabling precise coordination with 3.0V ±10% supply rails. |
| Battery switchover at 2.40V | Enters backup mode before VOUT drops below 2.0V RAM retention minimum, maximizing battery life. |
| 1µA typical VBATT supply current | Extends shelf life of lithium coin cells beyond 10 years in always-on embedded applications. |
| Manual reset with 200ms debounce | Eliminates need for external RC network; internal 70µA pull-up allows direct switch-to-ground connection. |
Applications
| Battery-Powered Embedded Controller | Intelligent Industrial Instrument |
|---|---|
Use Scenario: Portable data logger with SRAM buffer, powered by 3.0V Li-SOCl₂ battery and subject to intermittent solar charging. IC Role / Device Role / Timing Role: Supervises main supply, triggers reset on brownout, switches SRAM to backup during charge interruption, and monitors auxiliary sensor rail via PFI. Use Value: Prevents firmware corruption during voltage sag; retains 64KB RAM contents for >72 hours on 220mAh cell; eliminates external reset IC and power-switch FET. |
Use Scenario: Handheld multimeter with EEPROM calibration storage and real-time clock, operating across -20°C to +70°C ambient. IC Role / Device Role / Timing Role: Provides temperature-stable reset (±0.2% drift over range), asserts RESET within 200ms of cold start, and guards against µP hang using WDI fed by RTC interrupt. Use Value: Meets IEC 61000-4-2 ESD immunity requirements via integrated hysteresis; reduces BOM by replacing discrete supervisor + watchdog + battery switch. |
| Critical µP Power Monitoring | Portable Medical Diagnostic Device |
Use Scenario: Patient monitor with ARM Cortex-M4 MCU, dual 3.3V/5V rails, and flash-based firmware update capability. IC Role / Device Role / Timing Role: Monitors 3.3V core rail with 2.625V threshold, feeds PFO to µP GPIO for power-fail interrupt, and uses MR for safe firmware update abort. Use Value: Enables deterministic fail-safe shutdown before VCC drops below 2.7V; prevents partial flash writes; supports JTAG debug entry during reset hold. |
Use Scenario: Ultrasound probe with FPGA-based beamformer, powered by rechargeable Li-ion and requiring zero-data-loss during hot-swap battery replacement. IC Role / Device Role / Timing Role: Switches FPGA configuration RAM to VBATT during battery swap, asserts RESET to halt processing, and validates VCC recovery before resuming acquisition. Use Value: Guarantees uninterrupted RAM state during 200ms battery change; meets FDA Class II safety requirement for fault-tolerant power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | No watchdog timer; only RESET output (no RESET); 200ms timeout; same 2.625V threshold and SO-8 package. | Lacks WDI-based µP hang detection; suitable for simpler systems where software watchdog suffices. | Select MAX706RCSA+ if watchdog functionality is unnecessary and cost reduction is prioritized. |
| MAX802RCSA+ | Active-low RESET (push-pull), no RESET output; includes PFI/PFO but no MR input; identical reset threshold and timeout. | Requires external pull-up for RESET; cannot support manual reset button or PFO-to-MR auto-reset loop. | Choose MAX802RCSA+ only when board layout lacks space for MR trace and system reset logic is fully controlled by power events. |
Compared with MAX706RCSA+ and MAX802RCSA+, the MAX806RCSA+ uniquely combines active-high open-drain RESET, manual reset input, and watchdog timer in a single SO-8 package-enabling full hardware-level fault recovery without firmware dependency or additional components.
Availability
MAX806RCSA+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX806RCSA+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) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing reliability, low power, and integration.
The MAX806RCSA+T belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered specifically for systems demanding coordinated reset, watchdog, and battery-backup switching in space-constrained, battery-operated environments.
FAQ
What is the exact reset threshold voltage for MAX806RCSA+T?
The MAX806RCSA+T has a nominal reset threshold of 2.625V, with ±2% tolerance over temperature and supply voltage. This means reset is guaranteed to assert before VCC falls below 2.59V and will not trigger prematurely above 2.67V-optimized for 3.0V ±10% power systems. The R-suffix explicitly denotes this 2.625V variant, distinct from S (2.925V) and T (3.075V) versions.
Does MAX806RCSA+T support manual reset, and how is it implemented?
Yes, MAX806RCSA+T supports manual reset via its MR pin (Pin 6). A logic-low pulse ≥100ns on MR asserts RESET for the duration of the low signal plus a guaranteed 200ms after MR returns high. The pin features a 70µA internal pull-up, allowing direct connection to a momentary switch grounded to GND-no external resistor required. This behavior is confirmed in the Electrical Characteristics table under "MR Pull-Up Current" and "MR to Reset Delay".
How does the watchdog timer in MAX806RCSA+T operate, and can it be disabled?
The MAX806RCSA+T watchdog timer has a fixed 1.6s timeout (1.12–2.24s over temperature) and cannot be disabled. It clears on any rising or falling edge at WDI (Pin 6) and triggers RESET if WDI remains static longer than the timeout. Unlike older MAX690 variants, this watchdog is always active-no configuration register or pin strap exists to turn it off. This design ensures fail-safe µP supervision even if firmware fails to service the watchdog.
What is the function of the RESET pin on MAX806RCSA+T, and why is it open-drain?
The RESET pin (Pin 7) on MAX806RCSA+T is an active-high, open-drain output-functionally inverse to the active-low RESET found on MAX690/MAX802. It requires an external pull-up resistor to VCC or another logic rail. This architecture allows wired-OR connection with other reset sources (e.g., power sequencer outputs) and prevents contention with µPs having bidirectional reset I/O, such as the Motorola 68HC11. The datasheet specifies VOL ≤ 0.3V at 1.2mA sink current.
Can MAX806RCSA+T be used without a backup battery, and what modifications are needed?
Yes, MAX806RCSA+T can operate without a backup battery: connect both VBATT (Pin 8) and VOUT (Pin 1) directly to VCC (Pin 2). This disables battery switchover and configures VOUT as a buffered copy of VCC. However, doing so forfeits brownout RAM retention capability. For pure VCC-only supervision without battery support, Maxim recommends alternatives like MAX706RCSA+, which lacks VBATT functionality entirely and reduces quiescent current further.
MAX806RCSA+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:
- 2.625V
- 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+T FAQ
1.How can I place an order for MAX806RCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806RCSA+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 MAX806RCSA+T reliable?
The price and inventory of MAX806RCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806RCSA+T is usually 5 days.
3.What payment methods are accepted for MAX806RCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806RCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806RCSA+T?
MAX806RCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806RCSA+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 MAX806RCSA+T?
For technical support, including MAX806RCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806RCSA+T requirements.
6.How does Aetrix verify that MAX806RCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX806RCSA+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 MAX806RCSA+T meets industry standards.
7.What is the process for return or replacement of MAX806RCSA+T?
All MAX806RCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX806RCSA+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 MAX806RCSA+T part is unused and in its original packaging.
Return procedure for MAX806RCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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