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Analog Devices Inc./Maxim Integrated MAX706TESA
- Part No.:
- MAX706TESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706TESA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:8,804
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Product details
Overview
MAX706TESA from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing power-on reset, watchdog timeout (1.6s), 3.08V reset threshold, 1.25V power-fail comparator input, and debounced manual reset. It ensures reliable µP startup and brownout recovery in battery-powered portable instruments and industrial controllers.
For engineers reviewing the MAX706TESA datasheet, MAX706TESA pinout, MAX706TESA application, or MAX706TESA equivalent, this page delivers verified functional identity, SO-8 package mapping, confirmed timing behavior (200ms reset pulse), supply-current spec (100µA), and validated alternative options for critical power-monitoring designs.
Technical Context
The MAX706TESA implements a precision voltage monitor with fixed 3.08V reset threshold (±1.5% over temperature), guaranteed RESET assertion down to VCC = 1V, and integrated 1.25V reference for external PFI monitoring. Its watchdog timer requires WDI toggling within 1.6s to prevent WDO assertion.
It features TTL/CMOS-compatible MR input with 140ms minimum debounce, 100µA quiescent current at +3.3V, and dual-output capability via active-low RESET and open-drain WDO - both asserted during VCC brownout but with distinct release timing: RESET remains low for 200ms after VCC recovery, while WDO releases immediately upon VCC rise above threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% - precisely triggers reset when +3.3V supply drops below safe µP operating level |
| Reset Pulse Width | 200ms typical - ensures sufficient hold time for full µP initialization after power stabilization |
| Watchdog Timeout | 1.6s - provides robust software hang detection without requiring tight timing margins |
| Quiescent Current | 100µA at +3.3V - enables long battery life in portable equipment with continuous supervision |
| Supply Range | +3.15V to +5.5V - supports operation across standard +3.3V and legacy +5V µP rails |
| PFO Threshold | 1.25V internal reference - allows configurable power-fail warning via external resistor divider on PFI |
| MR Input Compatibility | TTL/CMOS - permits direct interface with µP GPIO or pushbutton without level-shifting |
Pinout & Package
MAX706TESA is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced TTL/CMOS-compatible trigger; pulls internal 70µA current source; initiates 200ms reset pulse when driven low |
| 2 VCC | Positive supply input | Accepts +3.15V to +5.5V; powers all internal circuits including reset generator and watchdog timer |
| 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 | High-impedance node referenced to 1.25V internal threshold; used to monitor auxiliary supplies or generate early-warning signals |
| 5 PFO | Active-low power-fail output | Open-drain output asserting low when PFI < 1.25V; can drive µP interrupt or MR to initiate controlled shutdown |
| 6 WDI | Watchdog input | Edge-sensitive input requiring transition every 1.6s; disables automatically if left floating or connected to high-Z tri-state output (<600nA leakage) |
| 7 RESET | Active-low reset output | Push-pull output held low during power-up/brownout; remains low for 200ms after VCC exceeds 3.08V |
| 8 WDO | Active-low watchdog output | Open-drain output asserting low on watchdog timeout or VCC brownout; releases immediately when VCC recovers above threshold |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset state even during deep brownout, preventing µP code execution at invalid voltages |
| WDI disable on high-impedance state | Eliminates false watchdog timeouts when µP enters sleep or tri-state mode, simplifying low-power firmware design |
| 200ms reset time delay | Meets µP power-on reset timing requirements without external RC components or timing ICs |
| 1.25V precision PFI reference | Enables accurate, temperature-stable power-fail detection for unregulated supplies or battery voltage monitoring |
| 100µA quiescent current | Minimizes standby power draw in always-on supervision applications such as smart sensors and IoT edge nodes |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single 3.3V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and monitors unregulated DC input via PFI to preemptively warn of adapter loss. Use Value: Prevents data corruption during switchover using PFO-triggered MR pulse and guarantees clean µP reset at 3.08V dropout. |
Use Scenario: PLC I/O module operating in harsh factory environment with fluctuating 24VDC-derived +3.3V supply. IC Role / Device Role / Timing Role: Provides brownout protection and software watchdog supervision for ARM Cortex-M4 core. Use Value: 200ms reset pulse ensures full peripheral initialization; WDO tied to NMI enables immediate fault logging before reset assertion. |
| Embedded Computing Systems | Critical µP Power Monitoring |
Use Scenario: Fanless embedded PC using +3.3V SoC with thermal throttling that may cause supply sag. IC Role / Device Role / Timing Role: Monitors +3.3V rail and asserts RESET on sub-3.08V events; uses MR for front-panel reset button. Use Value: Eliminates need for discrete reset IC + RC network; debounced MR input removes mechanical switch bounce issues. |
Use Scenario: Medical diagnostic device requiring fail-safe boot sequence and power-integrity logging. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET enforces hardware reset, WDO detects firmware lockup, PFO tracks backup battery health. Use Value: Single-chip solution meets IEC 62304 Class C safety requirements for deterministic reset behavior and independent watchdog coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TCSA | Same 3.08V reset threshold, SO-8 package, but rated for 0°C to +70°C commercial temp range | Lacks extended -40°C to +85°C industrial qualification; unsuitable for outdoor or automotive-adjacent deployments | Select MAX706TCSA only for cost-sensitive, ambient-temperature indoor applications where extended temperature range is unnecessary |
| TPS3808G30DBVR | 3.0V reset threshold (±0.5%), 350ms reset delay, 2.5µA quiescent current, no watchdog or PFI functionality | Lower power but lacks watchdog timer and programmable power-fail detection; requires external circuitry for equivalent feature set | Choose TPS3808G30DBVR only when ultra-low quiescent current is paramount and watchdog/PFI functions are handled elsewhere |
Compared with MAX706TCSA, MAX706TESA adds industrial temperature support and identical electrical specs; compared with TPS3808G30DBVR, MAX706TESA integrates watchdog and PFI functions in one SO-8 package, reducing BOM count and PCB area while maintaining 100µA supply current.
Availability
MAX706TESA is available at Aetrix Electronics and suitable for battery-powered portable instruments, industrial microcontroller controllers, embedded computing systems, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX706TESA 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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX706 family was designed specifically for cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring in a single 8-pin package.
FAQ
What is the reset threshold voltage of the MAX706TESA?
The MAX706TESA has a fixed reset threshold of 3.08V ±1.5%, specified over the full -40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and guaranteed to maintain accuracy under varying load and supply conditions, making it suitable for precise +3.3V system supervision.
Does the MAX706TESA include a watchdog timer function?
Yes, the MAX706TESA includes a watchdog timer with a nominal timeout period of 1.6s. The timer resets on each WDI edge transition and asserts WDO low if no transition occurs within the timeout window. Unlike some variants, the MAX706TESA watchdog cannot be disabled - it remains active whenever VCC is valid.
Can the MAX706TESA monitor a secondary power supply like +12V or battery voltage?
Yes, the MAX706TESA's PFI input accepts an external resistive divider to scale higher voltages (e.g., +12V or battery) down to the internal 1.25V comparator threshold. When PFI falls below 1.25V, PFO goes low - enabling early power-fail warning or triggering MR to initiate controlled shutdown before main supply collapse.
What is the function of the WDO pin on the MAX706TESA?
The WDO (Watchdog Output) pin on the MAX706TESA is an active-low, open-drain output that asserts low either when the watchdog timer expires (no WDI toggle within 1.6s) or when VCC drops below the 3.08V reset threshold. It releases immediately upon VCC recovery, distinguishing it from the latched 200ms RESET signal.
Is the MAX706TESA pin-compatible with other MAX706 variants?
Yes, the MAX706TESA shares identical SO-8 pinout (S8-2) and pin functions with all MAX706x and MAX706Ax variants in SO package, including MAX706RCSA, MAX706SCSA, and MAX706APESA. Differences are limited to reset threshold voltage and temperature grade - no PCB layout changes are required when substituting within the same package type.
MAX706TESA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706TESA FAQ
1.How can I place an order for MAX706TESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TESA 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 MAX706TESA reliable?
The price and inventory of MAX706TESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TESA is usually 5 days.
3.What payment methods are accepted for MAX706TESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TESA?
MAX706TESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TESA 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 MAX706TESA?
For technical support, including MAX706TESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TESA requirements.
6.How does Aetrix verify that MAX706TESA is sourced from the original manufacturer or authorized distributors?
All MAX706TESA 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 MAX706TESA meets industry standards.
7.What is the process for return or replacement of MAX706TESA?
All MAX706TESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TESA, 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 MAX706TESA part is unused and in its original packaging.
Return procedure for MAX706TESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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