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Analog Devices Inc./Maxim Integrated MAX706TCSA
- Part No.:
- MAX706TCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706TCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
MAX706TCSA from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (3.08V 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 MAX706TCSA datasheet, MAX706TCSA pinout, MAX706TCSA application, or MAX706TCSA equivalent, this page delivers verified specifications, SO-8 package details, functional role in power monitoring, and validated alternative options for industrial embedded designs requiring stable reset assertion down to VCC = 1V.
Technical Context
The MAX706TCSA integrates a precision voltage monitor with 3.08V reset threshold (±1.5% tolerance), a 1.6s watchdog timer that resets on WDI edge transitions, and a dedicated 1.25V reference-based PFI comparator for power-fail or low-battery warning. Its RESET output remains asserted for 200ms after VCC exceeds threshold.
It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V, guaranteed RESET assertion down to VCC = 1V, and 100µA quiescent current. The WDO output asserts low on watchdog timeout or VCC brownout, but deasserts immediately upon VCC recovery - unlike RESET which maintains 200ms delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset assertion before 3.3V µP supply drops below operational margin |
| Reset Pulse Width | 200ms typical; guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±40%; provides deterministic fail-safe response to firmware lockup without external timing components |
| Quiescent Current | 100µA max at VCC = 3.3V; enables long battery life in portable instrumentation |
| PFI Threshold | 1.25V ±40mV; supports configurable power-fail detection via external resistor divider |
| Supply Range | 3.15V to 5.5V; compatible with both regulated 3.3V and legacy 5V µP systems |
| Operating Temp | 0°C to +70°C; qualified for commercial-grade embedded control applications |
Pinout & Package
MAX706TCSA is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compatible, with 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internal 70µA pull-up; triggers 200ms reset pulse when pulled ≤0.6V |
| 2 VCC | Positive supply input | Accepts 3.15V–5.5V; powers all internal circuits including reset generator and watchdog |
| 3 GND | Ground reference | Return path for all internal currents and output sinks; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 1.25V reference |
| 5 PFO | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used for early-warning interrupt or MR triggering |
| 6 WDI | Watchdog input | Edge-sensitive; requires toggle within 1.6s to prevent WDO assertion; disables if left open (high-Z) |
| 7 RESET | Active-low reset output | Push-pull output; guaranteed low for VCC ≥1V during brownout; holds low 200ms after recovery |
| 8 WDO | Active-low watchdog output | Push-pull output; asserts low on timeout or VCC brownout; deasserts immediately when VCC recovers |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout conditions where supply collapses slowly |
| WDI disable on high-impedance state | Allows safe watchdog disable during µP sleep modes without external pull-down resistors |
| 200ms reset time delay | Meets µP reset timing requirements across temperature and voltage variations without external RC |
| 1.25V precision PFI reference | Enables accurate power-fail detection for unregulated rails or battery voltage monitoring |
| Debounced MR input | Eliminates need for external RC debounce circuitry; accepts mechanical switch inputs directly |
Applications
| Battery-Powered Portable Instruments | Industrial Controller Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC monitors 3.3V LDO output and battery voltage via PFI divider; asserts RESET on brownout and triggers orderly shutdown via PFO→MR. Use Value: Prevents corrupted EEPROM writes during battery depletion; extends usable runtime by enabling low-battery warning at 2.8V. |
Use Scenario: PLC I/O module operating from 3.3V rail derived from isolated DC-DC converter. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision for ARM Cortex-M4 MCU; WDO connected to NMI for firmware hang detection. Use Value: Guarantees deterministic boot sequence and prevents runaway code execution in safety-critical automation environments. |
| Embedded Computing Systems | Intelligent Sensor Nodes |
Use Scenario: Fanless industrial PC using 3.3V core supply and 5V I/O rail. IC Role / Device Role / Timing Role: Monitors 3.3V core supply with 3.08V threshold; RESET output drives motherboard reset logic; MR tied to front-panel reset button. Use Value: Eliminates need for discrete reset IC and RC network; reduces BOM count and improves timing accuracy over temperature. |
Use Scenario: Wireless environmental sensor node with Li-ion battery and ultra-low-power µC. IC Role / Device Role / Timing Role: Resets µC on battery undervoltage (via PFI) and detects firmware stalls (via WDI); PFO triggers wake-up interrupt for battery status check. Use Value: Achieves <100µA system standby current while maintaining full supervision coverage and fast wake-up response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA | 2.63V reset threshold (vs. 3.08V); identical pinout, timing, and feature set | Suitable for 2.7V–3.0V µP systems; not recommended for 3.3V systems requiring tighter margin above VDD min | Select when supervising lower-voltage µPs or when tighter brownout detection at ~2.6V is required |
| TPS3808G33DBVR | 3.3V fixed threshold; 200ms delay; no watchdog or PFI; SOT-23-6 package (6-pin) | Lacks watchdog and power-fail comparator; smaller footprint but fewer functions | Choose only if watchdog and PFI are unused; requires PCB redesign due to different pin count and layout |
Compared with MAX706RCSA, MAX706TCSA provides higher reset threshold for improved noise immunity in 3.3V systems; compared with TPS3808G33DBVR, it retains full watchdog and PFI functionality at the cost of larger SO-8 footprint - making it the only drop-in replacement among alternatives with identical supervision scope.
Availability
MAX706TCSA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across commercial temperature range (0°C to +70°C) and SO-8 packaging.
Supply support for MAX706TCSA 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 targets cost-sensitive microprocessor supervision needs in portable and embedded systems, delivering integrated reset, watchdog, and power-fail monitoring in minimal footprint without external components.
FAQ
What is the reset threshold voltage of the MAX706TCSA?
The MAX706TCSA has a nominal reset threshold of 3.08V (VCC falling), with ±1.5% tolerance over temperature and supply. This value is factory-trimmed and specified for operation with VCC ≥3.15V. It ensures reliable reset assertion before a 3.3V µP supply drops below its minimum operating voltage, and is distinct from the 2.63V (MAX706R) and 2.93V (MAX706S) variants in the same family. The MAX706TCSA maintains this threshold across its full 0°C to +70°C operating range.
Does the MAX706TCSA include a watchdog timer function?
Yes, the MAX706TCSA includes a watchdog timer with a nominal timeout period of 1.6s. The timer resets on any rising or falling edge at the WDI pin and asserts the WDO output low if no transition occurs within that window. Unlike the MAX706P/R/S/T base series, the MAX706TCSA's watchdog can be disabled by leaving WDI open or connecting it to a high-impedance tri-state output with leakage <600nA - a key feature confirmed in the datasheet's "WDI Disable Feature" section.
What is the purpose of the PFI and PFO pins on the MAX706TCSA?
The PFI (Power-Fail Input) pin connects to a resistor divider monitoring an unregulated or auxiliary supply; it compares that voltage against an internal 1.25V reference. When PFI falls below 1.25V, the PFO (Power-Fail Output) pin goes low, providing an early warning signal. In the MAX706TCSA, PFO is active-low and open-drain, allowing direct connection to MR for cascaded reset or to a µP interrupt line. This enables orderly shutdown before main supply collapse.
Can the MAX706TCSA operate from a 3.3V supply?
Yes, the MAX706TCSA is fully specified for operation from 3.15V to 5.5V, making it compatible with standard 3.3V systems. Its electrical characteristics - including 100µA quiescent current, 200ms reset pulse width, and 3.08V reset threshold - are guaranteed across this range. At 3.3V, the MR input remains TTL/CMOS-compatible, RESET and WDO outputs meet VOH/VOL specs, and the watchdog timer maintains 1.6s timeout accuracy per the datasheet's "ELECTRICAL CHARACTERISTICS" table.
What package type is used for the MAX706TCSA?
The MAX706TCSA uses an 8-pin SO (Small Outline) package, identified as S8-2 in Maxim's ordering guide. It is a surface-mount, gull-wing leaded package with 1.27mm pitch, JEDEC MS-012AC outline, and lead-free finish. This matches the pin configuration shown in the "Pin Configurations" section of the datasheet and is electrically and mechanically identical to other SO-8 variants in the MAX706 family such as MAX706RCSA and MAX706SCSA.
MAX706TCSA 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX706TCSA FAQ
1.How can I place an order for MAX706TCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TCSA 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 MAX706TCSA reliable?
The price and inventory of MAX706TCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TCSA is usually 5 days.
3.What payment methods are accepted for MAX706TCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TCSA?
MAX706TCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TCSA 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 MAX706TCSA?
For technical support, including MAX706TCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TCSA requirements.
6.How does Aetrix verify that MAX706TCSA is sourced from the original manufacturer or authorized distributors?
All MAX706TCSA 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 MAX706TCSA meets industry standards.
7.What is the process for return or replacement of MAX706TCSA?
All MAX706TCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TCSA, 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 MAX706TCSA part is unused and in its original packaging.
Return procedure for MAX706TCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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