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Analog Devices Inc./Maxim Integrated MAX806TCSA
- Part No.:
- MAX806TCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806TCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:3,432
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Product details
Overview
MAX806TCSA from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 3.075V reset threshold, 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 drops below 2.40V-used in embedded controllers requiring reliable power-fail detection and nonvolatile memory retention.
For engineers reviewing the MAX806TCSA datasheet, MAX806TCSA pinout, MAX806TCSA application, or MAX806TCSA equivalent, key selection criteria include its ±2% reset threshold accuracy, 40µA VCC supply current, guaranteed RESET assertion down to VCC = 1V, battery-switching capability with VBATT > VCC support, and compatibility with 3.0V/3.3V µP systems.
Technical Context
The MAX806TCSA integrates a precision reset comparator with 3.075V falling/rising threshold (±2%), a 1.6s watchdog timer cleared by WDI transitions, and a dual-path power switch that connects VOUT to VCC above VSW (2.40V) and to VBATT below it. Its PFI input enables external power-fail monitoring at 1.237V with 10mV hysteresis.
It features an active-high open-drain RESET output (inverse of MAX690/MAX802), manual reset input (MR) with 70µA internal pull-up, and guaranteed logic-low PFO during VCC brownout or PFI undervoltage. The device operates across 0°C to +70°C and supports battery voltages up to 6.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±2%) - ensures reset assertion before 3.3V supply falls below system stability margin |
| Reset Timeout Period | 200ms - provides sufficient hold time for µP initialization after power recovery |
| Watchdog Timeout | 1.6s - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40µA (typ) - enables long battery life in always-on monitoring applications |
| Battery Supply Current | 1µA (max) - minimizes drain on backup lithium cell during extended standby |
| Power-Fail Threshold | 1.237V (±2%) - allows accurate monitoring of auxiliary supplies via external resistor divider |
| Operating Voltage Range | VCC = 2.72V to 5.5V - supports operation during brownout and wide-input industrial supplies |
Pinout & Package
MAX806TCSA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant, 3.9mm × 4.9mm body, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT; connects to RAM VDD to maintain data during power loss |
| 2 - VCC | Main system supply input | Primary 3.0V/3.3V power rail monitored for reset generation and switchover control |
| 3 - GND | Ground reference | Common return for all analog and digital functions; must be low-impedance for noise immunity |
| 4 - PFI | Power-fail input | Accepts external voltage divider to monitor secondary supplies; triggers PFO low at 1.237V |
| 5 - PFO | Power-fail output | Active-low open-drain signal indicating undervoltage condition on PFI or VCC brownout |
| 6 - MR | Manual reset input | Active-low input with 70µA internal pull-up; asserts RESET for 200ms after release |
| 7 - RESET | Active-high reset output | Open-drain output (requires external pull-up); inverse of MAX690/MAX802 RESET pin |
| 8 - VBATT | Backup battery input | Accepts 3.6V lithium cell; can exceed VCC; powers VOUT when VCC < 2.40V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, critical for data retention in low-VCC states |
| Battery-backup switchover with VBATT > VCC support | Enables use of standard 3.6V lithium coin cells without level-shifting or diode drop penalties |
| ±2% reset and power-fail threshold accuracy | Reduces design margin uncertainty vs. ±4% alternatives, enabling tighter supply tolerance budgets |
| Watchdog timer with edge-triggered clear | Prevents false resets from static WDI states; requires µP firmware to toggle WDI periodically |
| 200ms reset timeout with restart-on-brownout | Provides deterministic reset timing while reasserting immediately if VCC dips again mid-recovery |
Applications
| Battery-Powered Embedded Controller | Critical µP Power Monitoring |
|---|---|
|
Use Scenario: Industrial sensor node powered by primary 3.3V supply and backup lithium coin cell, operating unattended for years. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0 during VCC brownout and generating PFO interrupt on auxiliary 5V rail failure. Use Value: Prevents corrupted firmware execution and preserves sensor calibration data in SRAM using seamless VBATT switchover at 2.40V. |
Use Scenario: Medical infusion pump with dual power sources (main DC adapter + Li-ion backup) requiring fail-safe µP reset on any supply anomaly. IC Role / Device Role / Timing Role: Primary power supervisor monitoring VCC and triggering 200ms RESET pulse on 3.075V threshold violation or 1.6s WDI timeout. Use Value: Guarantees µP restart within specification before motor driver ICs enter undefined state, meeting IEC 62304 safety requirements. |
| Intelligent Instrumentation | Portable Test Equipment |
|
Use Scenario: Handheld multimeter with EEPROM configuration storage and real-time clock, powered by rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Monitors main 3.3V rail derived from battery regulator; asserts RESET and switches VOUT to VBATT when VCC falls below 2.40V. Use Value: Maintains RTC and calibration registers during battery swap or deep discharge, eliminating user recalibration. |
Use Scenario: Portable oscilloscope with FPGA-based acquisition engine and flash memory, requiring deterministic boot sequence after power interruption. IC Role / Device Role / Timing Role: Generates precise 200ms active-high RESET pulse on power-up and detects µP hang via WDI toggling. Use Value: Eliminates need for external RC reset circuits; reduces BOM count while improving reset timing repeatability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802TCSA | Active-low RESET output (push-pull), no MR input, same 3.075V threshold and 200ms timeout | Suitable where µP requires active-low reset and manual reset is unnecessary | Select MAX802TCSA when interfacing with legacy µPs lacking MR functionality and requiring direct-drive active-low reset |
| MAX706TCSA | No battery switchover, no WDI, 3.085V reset threshold (±2%), 200ms timeout, includes PFI/PFO | Designed for non-battery-backed systems needing only supply monitoring and reset | Choose MAX706TCSA for cost-sensitive applications without backup RAM or watchdog requirements |
Compared with MAX802TCSA and MAX706TCSA, MAX806TCSA uniquely combines active-high open-drain RESET, manual reset input, and battery switchover-making it the only option among the three for systems requiring all three functions in a single 8-pin SO package.
Availability
MAX806TCSA 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 industrial temperature ranges.
Supply support for MAX806TCSA 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, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX806TCSA belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered specifically for reliable power monitoring, brownout protection, and battery-backed memory retention in space-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX806TCSA?
The MAX806TCSA has a nominal reset threshold voltage of 3.075V with ±2% accuracy over temperature and supply variations. This value applies to both VCC rising and falling conditions and is optimized for 3.3V systems with ±5% supply tolerance. The threshold ensures reset assertion before the 3.3V rail falls below 3.0V, preventing µP malfunction during brownout.
Does the MAX806TCSA support battery backup with VBATT higher than VCC?
Yes, the MAX806TCSA explicitly supports VBATT exceeding VCC-enabling direct connection of standard 3.6V lithium coin cells without diodes or regulators. Its internal battery switchover circuit activates when VCC falls below 2.40V (VSW), connecting VBATT to VOUT through a 140Ω switch while isolating VCC, ensuring uninterrupted power to CMOS RAM.
How does the watchdog timer function in the MAX806TCSA?
The MAX806TCSA includes a fixed 1.6s watchdog timer that triggers reset if the WDI pin remains static (high or low) beyond timeout. The timer clears on any WDI edge transition and remains disabled while RESET is asserted. Unlike some predecessors, this watchdog cannot be disabled and requires periodic firmware toggling of WDI to prevent spurious resets.
What is the purpose of the PFI and PFO pins on the MAX806TCSA?
The PFI (Power-Fail Input) pin accepts an external voltage-typically from a resistor divider-to monitor auxiliary supplies. When PFI falls below 1.237V, the open-drain PFO (Power-Fail Output) pulls low, signaling undervoltage. PFO can be tied to MR on compatible devices to generate reset, or used independently as an interrupt source for µP firmware event handling.
Can the MAX806TCSA operate down to 1V VCC?
Yes, the MAX806TCSA guarantees RESET assertion for VCC as low as 1V, provided VBATT > 1V. This feature ensures fail-safe reset behavior during deep brownout conditions where other supervisors may lose functionality. Without VBATT, RESET remains valid down to VCC = 1V, supporting robust operation in low-voltage recovery scenarios.
MAX806TCSA 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:
- 3.075V
- 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
MAX806TCSA FAQ
1.How can I place an order for MAX806TCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806TCSA 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 MAX806TCSA reliable?
The price and inventory of MAX806TCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806TCSA is usually 5 days.
3.What payment methods are accepted for MAX806TCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806TCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806TCSA?
MAX806TCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806TCSA 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 MAX806TCSA?
For technical support, including MAX806TCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806TCSA requirements.
6.How does Aetrix verify that MAX806TCSA is sourced from the original manufacturer or authorized distributors?
All MAX806TCSA 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 MAX806TCSA meets industry standards.
7.What is the process for return or replacement of MAX806TCSA?
All MAX806TCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX806TCSA, 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 MAX806TCSA part is unused and in its original packaging.
Return procedure for MAX806TCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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