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Analog Devices Inc./Maxim Integrated MAX706RCSA+T
- Part No.:
- MAX706RCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706RCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX706RCSA+T from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (2.63V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input. It ensures reliable µP startup in battery-powered instruments and portable controllers.
For engineers reviewing the MAX706RCSA+T datasheet, MAX706RCSA+T pinout, MAX706RCSA+T application, or MAX706RCSA+T equivalent, this page delivers verified electrical specs, SO-8 package mapping, functional role in power monitoring, and validated alternative parts for industrial embedded design.
Technical Context
The MAX706RCSA+T integrates a precision voltage monitor with 200ms reset pulse width, a watchdog timer that resets on WDI edge transitions and asserts WDO low after 1.6s timeout, and a dedicated 1.25V reference comparator for PFI-based power-fail or low-battery detection. Its MR input is TTL/CMOS-compatible with 500ns minimum pulse width at VCC = 3V.
Reset assertion is guaranteed down to VCC = 1V, and the device operates across 0°C to +70°C with 100µA quiescent current. The active-low RESET output remains asserted for 200ms after VCC exceeds 2.63V or MR release, ensuring stable µP initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reset assertion before µP supply drops below operational minimum for +3V systems |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP clock stabilization and register initialization |
| Watchdog Timeout | 1.6s ±0.65s; detects µP lockup without requiring external timing components |
| Quiescent Current | 100µA max; enables long battery life in portable equipment |
| Power-Fail Threshold | 1.25V internal reference; supports configurable PFI divider for early warning of supply collapse |
| Supply Range | 1.0V to 5.5V; guarantees RESET assertion even during deep brownout down to VCC = 1V |
| Manual Reset Input | Debounced TTL/CMOS-compatible; accepts 500ns pulses at 3V, enabling pushbutton or logic-triggered reset |
Pinout & Package
MAX706RCSA+T is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Pull low to initiate 200ms reset pulse; internally pulled up with 70µA current; TTL/CMOS-compatible |
| 2 VCC | Positive supply input | Accepts 1.0V–5.5V; powers all internal circuits including reset generator and watchdog timer |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | Compares external voltage against 1.25V reference; used for battery monitoring or unregulated supply tracking |
| 5 PFO | Active-low power-fail output | Goes low when PFI < 1.25V; drives µP interrupt or initiates controlled shutdown sequence |
| 6 WDI | Watchdog input | Edge-sensitive; requires toggle within 1.6s to prevent WDO assertion; disables when open or high-Z |
| 7 RESET | Active-low reset output | Asserts low during power-up, brownout, or MR activation; holds for 200ms after recovery |
| 8 WDO | Active-low watchdog output | Asserts low if WDI inactive >1.6s; also asserts during VCC brownout but releases immediately on recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during severe brownout conditions where other supervisors may release prematurely |
| 200ms reset time delay | Matches typical µP oscillator start-up and internal state machine stabilization requirements |
| 1.25V precision PFI reference | Enables accurate low-battery detection or unregulated supply monitoring without external references |
| WDI disable on high-impedance state | Allows safe watchdog deactivation when µP enters sleep mode or tri-states WDI line |
| 100µA quiescent current | Minimizes standby power draw in always-on battery applications such as medical sensors or IoT endpoints |
Applications
| Battery-Powered Instruments | Portable Controllers |
|---|---|
Use Scenario: Handheld multimeter operating from single 3.7V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC monitors main rail and triggers reset if voltage sags below 2.63V; PFI tracks battery voltage via resistor divider to warn of depletion. Use Value: Prevents corrupted measurements during low-voltage operation and enables graceful shutdown before data loss. |
Use Scenario: Industrial PLC remote I/O module powered by 3.3V rail with watchdog-critical firmware. IC Role / Device Role / Timing Role: Generates power-on reset and monitors µP activity via WDI; WDO connected to MR to force recovery on firmware hang. Use Value: Eliminates need for external RC reset timers and discrete watchdog circuits, reducing BOM count and board space. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Fanless embedded PC using +3.3V CPU core supply and +5V peripheral rail. IC Role / Device Role / Timing Role: Resets system if +3.3V drops below 2.63V; PFO tied to µP NMI to log power anomalies before shutdown. Use Value: Provides deterministic reset behavior independent of motherboard VRM response time or sequencing delays. |
Use Scenario: Medical infusion pump requiring fail-safe power supervision per IEC 62304. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET ensures safe boot, while PFI/WDO provide redundant fault detection paths. Use Value: Meets Class C software safety requirements by delivering independently verified voltage and activity monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA+ | Higher reset threshold (2.93V); identical SO-8 package, pinout, and feature set | Suitable for +3.3V systems where tighter margin above 2.63V is required to avoid false resets | Select MAX706SCSA+ when main supply nominal is ≥3.0V and brownout tolerance must exceed 2.93V |
| TPS3808G12DBVR | 2.93V reset threshold, 200ms delay, but no PFI/PFO comparator or watchdog function | Limited to basic reset-only applications; lacks power-fail warning and µP activity monitoring capability | Choose TPS3808G12DBVR only if watchdog and PFI features are unnecessary and TI sourcing is preferred |
Compared with MAX706RCSA+, MAX706SCSA+ offers higher reset threshold for improved noise immunity in noisy +3.3V environments, while TPS3808G12DBVR reduces cost and complexity where full supervisory functionality is not required.
Availability
MAX706RCSA+T is available at Aetrix Electronics and suitable for battery-powered instruments, portable controllers, computers, and critical µP power monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX706RCSA+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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX706 family delivers low-cost, integrated µP supervision for +3V systems, combining reset, watchdog, and power-fail detection in a single SO-8 package to reduce board space and improve system reliability.
FAQ
What is the reset threshold voltage for MAX706RCSA+T?
The MAX706RCSA+T has a fixed reset threshold of 2.63V (VCC falling), with 20mV hysteresis. This value is factory-trimmed and guaranteed over temperature, making it suitable for monitoring +3V supplies where reliable assertion below the µP's minimum operating voltage is critical. The MAX706RCSA+T maintains this specification across its 0°C to +70°C operating range.
Does MAX706RCSA+T include a watchdog timer?
Yes, the MAX706RCSA+T includes a watchdog timer with a nominal 1.6s timeout period. It monitors the WDI input for edge transitions and asserts the WDO pin low if no transition occurs within that window. The watchdog function is enabled by default and disables automatically when WDI is left open or driven high-impedance, a key safety feature during µP sleep modes.
What package type is used for MAX706RCSA+T?
The MAX706RCSA+T uses an 8-pin SO (Small Outline) package, identified as S8-2 in Maxim's ordering nomenclature. It is a surface-mount, lead-free RoHS-compliant package with standard 1.27mm pitch, compatible with automated PCB assembly and reflow soldering processes.
Can MAX706RCSA+T monitor a secondary power supply?
Yes, the MAX706RCSA+T includes a dedicated PFI (Power-Fail Input) pin with an internal 1.25V reference comparator. By connecting PFI to a resistive divider from an unregulated or auxiliary supply, designers can configure early-warning detection for battery depletion or auxiliary rail collapse - independent of the main VCC monitoring function.
Is MAX706RCSA+T compatible with 3.3V and 5V systems?
Yes, the MAX706RCSA+T operates from VCC = 1.0V to 5.5V and is fully specified for both +3.3V and +5V µP systems. Its reset threshold (2.63V) and PFI reference (1.25V) remain stable across this range, and all inputs/outputs maintain TTL/CMOS compatibility at both supply levels, enabling flexible use in dual-rail or adapter-powered designs.
MAX706RCSA+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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
MAX706RCSA+T FAQ
1.How can I place an order for MAX706RCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RCSA+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 MAX706RCSA+T reliable?
The price and inventory of MAX706RCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RCSA+T is usually 5 days.
3.What payment methods are accepted for MAX706RCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RCSA+T?
MAX706RCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RCSA+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 MAX706RCSA+T?
For technical support, including MAX706RCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RCSA+T requirements.
6.How does Aetrix verify that MAX706RCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX706RCSA+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 MAX706RCSA+T meets industry standards.
7.What is the process for return or replacement of MAX706RCSA+T?
All MAX706RCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RCSA+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 MAX706RCSA+T part is unused and in its original packaging.
Return procedure for MAX706RCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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