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Analog Devices Inc./Maxim Integrated MAX806TCSA+T
- Part No.:
- MAX806TCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX806TCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
MAX806TCSA+T 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, asserts reset during power-up/brownout/watchdog timeout, and switches VOUT to VBATT when VCC falls below 2.40V - used in embedded controllers and battery-powered instrumentation.
For engineers reviewing the MAX806TCSA+T datasheet, MAX806TCSA+T pinout, MAX806TCSA+T application, or MAX806TCSA+T equivalent, this page delivers verified electrical specs, package mapping, functional role in µP power sequencing, and validated alternative options for 3.0V/3.3V system supervision.
Technical Context
The MAX806TCSA+T integrates a precision reset comparator with ±2% threshold tolerance (3.075V), a non-disableable 1.6s watchdog timer cleared by WDI edges, and dual-path power switching: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω switch. Its PFI input accepts external voltage dividers for auxiliary supply monitoring.
It features guaranteed RESET assertion down to VCC = 1V, 40µA VCC supply current (VCC < 3.6V), 1µA battery leakage, and operates across 0°C to +70°C in 8-pin SOIC. The active-high RESET output requires external pull-up and is inverse to the MAX802/MAX690 active-low variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±2%) - triggers reset when VCC falls below nominal 3.3V supply by >5%, ensuring reliable brownout detection before µP instability. |
| Reset Timeout Period | 200ms (140–280ms) - guarantees minimum reset pulse width for full µP initialization, independent of VCC ramp rate. |
| Watchdog Timeout | 1.6s (1.12–2.24s) - detects µP lockup; timer resets on any WDI edge, cannot be disabled. |
| VCC Supply Current | 40µA typical (VCC < 3.6V) - enables low-power operation in battery-backed systems without compromising supervision accuracy. |
| Battery Leakage Current | 0.01–0.5µA - minimizes self-discharge of lithium backup cells, extending shelf life in portable equipment. |
| VBATT Switch Threshold | 2.40V (2.30–2.50V) - initiates switchover to battery before VOUT drops below 2.0V, preserving CMOS RAM data integrity. |
| PFI Input Threshold | 1.237V ±25mV - supports accurate undervoltage detection of auxiliary rails via resistor divider, with 10mV hysteresis. |
Pinout & Package
MAX806TCSA+T is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix), and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω switch); connects to backup battery when VCC < 2.40V. |
| 2 - VCC | Main supply input | Primary 3.0V/3.3V power rail; powers internal circuitry and defines reset threshold reference. |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; substrate tied to higher of VCC/VBATT. |
| 4 - PFI | Power-fail input | Monitors auxiliary supply via external divider; trips PFO low when voltage falls below 1.237V. |
| 5 - PFO | Power-fail output | Active-low open-drain signal indicating PFI undervoltage or VCC < 2.40V; can drive MR on MAX704/MAX806. |
| 6 - WDI | Watchdog input | Edge-sensitive input; clears 1.6s timer on rising/falling transitions; no disable function. |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX802 RESET; requires external pull-up; pulses high for 200ms on fault conditions. |
| 8 - VBATT | Backup-battery input | Accepts 3.6V lithium cell; may exceed VCC during normal operation; enables seamless RAM retention during power loss. |
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 states. |
| 200ms reset timeout with restart-on-brownout | Each VCC dip below threshold restarts the timer, eliminating race conditions during noisy or slow-ramping supplies. |
| Battery switchover at 2.40V with hysteresis | Prevents oscillation near switchover point and extends battery life by delaying backup activation until necessary. |
| 1.6s watchdog timer with edge-triggered clear | Eliminates false timeouts from static logic levels; robust against noise-induced glitches on WDI line. |
| 40µA VCC supply current (typ) | Reduces quiescent load on primary supply, critical for long-duration battery operation in portable instruments. |
| 1µA battery supply current (typ) | Minimizes parasitic drain on backup cell, supporting multi-year shelf life in unpowered storage scenarios. |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
Use Scenario: Industrial handheld meter operating on single 3.6V Li-ion cell with 3.3V µP and SRAM. IC Role / Device Role / Timing Role: Supervises main supply, asserts RESET on brownout, switches VOUT to VBATT at 2.40V, and monitors battery health via PFI. Use Value: Guarantees µP reset integrity down to VCC = 1V and preserves RAM data for >10 years using ultra-low 1µA battery leakage. |
Use Scenario: Handheld oscilloscope with real-time waveform capture and nonvolatile settings storage. IC Role / Device Role / Timing Role: Provides 200ms power-on reset, 1.6s watchdog supervision of ARM Cortex-M core, and automatic RAM backup during AC power loss. Use Value: Eliminates need for external reset generator and discrete battery switch, reducing BOM count by 4 components. |
| Critical µP Power Monitoring | Portable Medical Diagnostic Device |
Use Scenario: Remote telemetry node with wireless transmission and low-duty-cycle sensing. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output, asserts RESET if supply dips below 3.075V, and signals impending power failure via PFO to trigger data save. Use Value: ±2% reset threshold tolerance ensures deterministic behavior across temperature, avoiding spurious resets in field deployments. |
Use Scenario: FDA-cleared glucose monitor requiring guaranteed boot integrity and persistent calibration storage. IC Role / Device Role / Timing Role: Generates clean 200ms reset pulse at power-up, guards against firmware hangs via WDI, and maintains SRAM during battery swaps. Use Value: Battery switchover at precisely 2.40V prevents RAM corruption while maximizing usable battery capacity before backup activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802TCSA+T | Active-low RESET output; identical reset threshold (3.075V), watchdog, and switchover specs. | Requires µP with active-low reset input; no external pull-up needed on RESET. | Select when interfacing with legacy µPs mandating active-low reset assertion and board layout already uses pull-down configuration. |
| MAX706TCSA+ | No battery switchover or VBATT pin; adds push-button manual reset (MR) and power-fail warning (PFI/PFO). | Suitable for non-battery-backed systems; lacks RAM backup capability but offers lower cost and smaller footprint. | Choose for cost-sensitive 3.3V applications without backup power requirements, where manual reset and power-fail alert suffice. |
Compared with MAX802TCSA+T and MAX706TCSA+, the MAX806TCSA+T uniquely provides active-high open-drain RESET with battery switchover - essential for µPs requiring high-asserted reset and uninterrupted RAM retention during main supply failure.
Availability
MAX806TCSA+T is available at Aetrix Electronics and suitable for battery-powered computers, embedded controllers, and intelligent instrumentation requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX806TCSA+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, automotive, communications, and computing markets.
The MAX806TCSA+T belongs to Maxim's µP supervisory family targeting 3.0V/3.3V systems, engineered to replace discrete reset generators and battery switches with integrated, temperature-stable supervision and low-quiescent-power operation.
FAQ
What is the reset threshold voltage of the MAX806TCSA+T?
The MAX806TCSA+T has a nominal reset threshold voltage of 3.075V with ±2% tolerance over temperature. This value is specified for VCC falling conditions and ensures reset assertion before the 3.3V supply drops below 3.0V, providing robust brownout protection for 3.3V µP systems.
Does the MAX806TCSA+T support battery backup functionality?
Yes, the MAX806TCSA+T supports battery backup via its VBATT pin and internal switchover circuitry. When VCC falls below 2.40V, VOUT automatically connects to VBATT through a 140Ω switch, preserving CMOS RAM data. VBATT may exceed VCC, enabling use of standard 3.6V lithium cells.
What is the function of the WDI pin on the MAX806TCSA+T?
The WDI (Watchdog Input) pin on the MAX806TCSA+T is edge-sensitive and clears the internal 1.6s watchdog timer on any rising or falling transition. If WDI remains static beyond 1.6s, the timer expires and triggers a reset pulse. The watchdog function cannot be disabled and operates independently of other supervision features.
How does the MAX806TCSA+T differ from the MAX802TCSA+T?
The MAX806TCSA+T features an active-high open-drain RESET output, while the MAX802TCSA+T provides an active-low RESET output. Both share identical reset threshold (3.075V), watchdog timing (1.6s), and battery switchover behavior. The choice depends on µP reset input polarity and whether external pull-up is preferred.
What package type and environmental compliance does the MAX806TCSA+T use?
The MAX806TCSA+T is supplied in an 8-pin SOIC package (S8+4 outline) with lead-free (RoHS-compliant) finish indicated by the "+" suffix. It meets MSL Level 1 moisture sensitivity and is rated for 0°C to +70°C operation, with thermal characteristics supporting up to 471mW dissipation at +70°C.
MAX806TCSA+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:
- 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+T FAQ
1.How can I place an order for MAX806TCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806TCSA+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 MAX806TCSA+T reliable?
The price and inventory of MAX806TCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806TCSA+T is usually 5 days.
3.What payment methods are accepted for MAX806TCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806TCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806TCSA+T?
MAX806TCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806TCSA+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 MAX806TCSA+T?
For technical support, including MAX806TCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806TCSA+T requirements.
6.How does Aetrix verify that MAX806TCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX806TCSA+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 MAX806TCSA+T meets industry standards.
7.What is the process for return or replacement of MAX806TCSA+T?
All MAX806TCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX806TCSA+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 MAX806TCSA+T part is unused and in its original packaging.
Return procedure for MAX806TCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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