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Analog Devices Inc./Maxim Integrated MAX706SESA+
- Part No.:
- MAX706SESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706SESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
MAX706SESA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation during power-up/down/brownout (2.93V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input (PFI), and debounced manual-reset input (MR). It operates over –40°C to +85°C in 8-pin SO package and is used in battery-powered portable instruments and embedded controllers requiring reliable power monitoring.
For engineers reviewing the MAX706SESA+ datasheet, MAX706SESA+ pinout, MAX706SESA+ application, or MAX706SESA+ equivalent, key selection considerations include its 2.93V reset threshold, active-low RESET output, watchdog disable capability via high-impedance WDI, guaranteed reset assertion down to VCC = 1V, and compatibility with TTL/CMOS logic levels across 3V–5.5V supply range.
Technical Context
The MAX706SESA+ implements a precision voltage-monitoring architecture with internal 2.93V reset threshold (±1.5% tolerance), 20mV hysteresis, and a dedicated 1.25V reference for the PFI comparator. Its reset generator asserts RESET low for ≥200ms after VCC rises above threshold or MR is released.
The integrated watchdog timer monitors WDI transitions and times out after 1.6s (±40%) if no edge occurs; it disables automatically when WDI is left open or driven by a tri-state output with leakage <600nA - a feature exclusive to the MAX706A-series variants. The device guarantees RESET assertion down to VCC = 1V, ensuring robust behavior during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (±1.5%) - triggers reset when VCC falls below this level; optimized for +3.3V systems |
| Reset Pulse Width | 200ms minimum - ensures µP completes full initialization before release from reset |
| Watchdog Timeout | 1.6s (±40%) - provides fail-safe recovery window for firmware hang detection |
| Supply Current | 100µA typical at VCC = 3.3V - enables long battery life in portable applications |
| PFI Threshold | 1.25V (±40mV) - supports configurable power-fail warning via external resistor divider |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded environments |
| Output Drive | RESET sinks 1.2mA @ 0.3V - directly interfaces with standard CMOS/TTL µP reset inputs |
Pinout & Package
MAX706SESA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount 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; internally pulled up with 70µA current; 500ns min pulse width at 3V |
| 2 VCC | Positive supply input | Accepts 2.7V–5.5V; reset asserted down to VCC = 1V; bypass with 0.1µF capacitor recommended |
| 3 GND | Ground reference | Common return for all internal circuits and outputs; must be low-impedance connection |
| 4 PFI | Power-fail comparator input | Monitors external voltage via resistive divider; compares to internal 1.25V reference |
| 5 PFO | Active-low power-fail output | Asserts low when PFI < 1.25V; can interrupt µP or trigger MR for cascaded reset |
| 6 WDI | Watchdog input | Edge-sensitive; toggling resets 1.6s timer; high-impedance state disables watchdog (MAX706A-series) |
| 7 RESET | Active-low reset output | Guaranteed low during power-up/brownout; held low ≥200ms after recovery; drives µP reset pin |
| 8 WDO | Active-low watchdog output | Asserts low on watchdog timeout or VCC undervoltage; deasserts immediately when VCC recovers |
Key Features
| Feature | Design Value |
|---|---|
| 2.93V Precision Reset Threshold | Matches +3.3V µP supply rails with ±1.5% tolerance and 20mV hysteresis for noise immunity |
| Configurable Power-Fail Detection | 1.25V internal reference enables early-warning shutdown for unregulated supplies via PFI/PFO |
| Watchdog Disable on High-Z WDI | Eliminates unintended timeouts during µP sleep or tri-state I/O modes without external pull-up |
| Guaranteed Reset to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing partial µP execution |
| Debounced Manual Reset Input | 70µA internal pull-up and 200ms reset pulse width suppress switch bounce without external RC |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
|
Use Scenario: Battery-powered handheld ECG device operating from single Li-ion cell with DC-DC regulation to +3.3V. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET during battery voltage sag and generating power-fail interrupt via PFO when main rail drops below safe operating level. Use Value: Prevents corrupted memory writes and ensures clean boot after battery recharge; 100µA quiescent current extends runtime between charges. |
Use Scenario: DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings and noisy 24V DC field power. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing µP reset during 24V supply transients and detecting firmware lockup via WDI polling. Use Value: Maintains system integrity under industrial EMI; –40°C to +85°C rating ensures operation in unconditioned enclosures. |
| Smart Energy Meter | Network Edge Gateway |
|
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply architecture (3.3V logic, 5V RTC/backlight). IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V rail for µP reset and uses PFI to detect 5V rail collapse for graceful data save before power loss. Use Value: Enables certified last-gasp data storage; 1.25V PFI reference allows precise trip point setting independent of VCC variation. |
Use Scenario: Cellular-connected IoT gateway powered by PoE or wall adapter, requiring fail-safe reboot on software crash or power interruption. IC Role / Device Role / Timing Role: Resets ARM Cortex-M host processor on brownout and services NMI via WDO timeout to recover hung network stacks. Use Value: Eliminates need for external watchdog IC; 1.6s timeout balances responsiveness and false-trigger avoidance in wireless firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TESA+ | 3.08V reset threshold (vs. 2.93V); identical pinout, timing, and features | Better suited for +3.3V systems with tighter VCC tolerance or higher noise margin requirement | Select MAX706TESA+ when design uses 3.3V ±3% supply and requires higher reset trip point to avoid nuisance resets |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor); 2.93V fixed option available; 35µA IQ; no integrated PFI comparator | Lacks dedicated power-fail warning path; requires external components for PFI-equivalent function | Choose TPS3808G12DBVR only if adjustable threshold is needed and PFI functionality is implemented separately |
Compared with MAX706TESA+, MAX706SESA+ offers lower reset threshold for earlier intervention in marginal 3.3V supplies; versus TPS3808G12DBVR, it integrates PFI/PFO without external components but consumes higher quiescent current.
Availability
MAX706SESA+ is available at Aetrix Electronics and suitable for industrial control systems, portable instrumentation, smart metering, and embedded networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706SESA+ 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 cost-effective, integrated µP supervision for +3V systems - emphasizing low-power operation, accurate voltage thresholds, and watchdog reliability in space-constrained embedded designs.
FAQ
What is the reset threshold voltage for MAX706SESA+?
The MAX706SESA+ has a factory-trimmed reset threshold of 2.93V (±1.5%) with 20mV hysteresis. This value is specified for VCC falling conditions and is optimized for reliable monitoring of +3.3V power rails. The threshold remains stable across the full –40°C to +85°C operating temperature range and is guaranteed by production testing per the MAX706SESA+ datasheet.
Does MAX706SESA+ include a watchdog timer?
Yes, MAX706SESA+ includes a watchdog timer with a nominal timeout period of 1.6s (±40%). It monitors edges on the WDI pin and asserts the WDO output low if no transition occurs within that window. Unlike the base MAX706R/S/T series, MAX706SESA+ belongs to the MAX706A-series and supports automatic watchdog disable when WDI is left open or driven by a high-impedance tri-state output with leakage <600nA.
Can MAX706SESA+ monitor a secondary power supply?
Yes, MAX706SESA+ can monitor a secondary supply using its PFI (Power-Fail Input) pin, which compares an external voltage against an internal 1.25V reference. By connecting PFI to a resistive divider from the secondary rail, designers set a custom trip point. When the divided voltage falls below 1.25V, PFO goes low - enabling early-warning shutdown or triggering MR to assert RESET.
What package type is used for MAX706SESA+?
MAX706SESA+ is supplied in an 8-pin SO (Small Outline) package with JEDEC MS-012AC outline and 1.27mm lead pitch (package code S8-2). It is RoHS-compliant, surface-mount compatible, and rated for reflow soldering per J-STD-020. The package dimensions and thermal characteristics are documented in the MAX706SESA+ package drawing on Maxim's website.
Is MAX706SESA+ compatible with 3.3V microprocessors?
Yes, MAX706SESA+ is fully compatible with 3.3V microprocessors. Its 2.93V reset threshold aligns with typical 3.3V supply tolerances (±5%), and its RESET output sinks 1.2mA at 0.3V - meeting standard CMOS/TTL input requirements. The device operates from 2.7V to 5.5V, draws only 100µA at 3.3V, and guarantees reset assertion down to VCC = 1V, making it ideal for 3.3V embedded systems.
MAX706SESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX706SESA+ FAQ
1.How can I place an order for MAX706SESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706SESA+ 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 MAX706SESA+ reliable?
The price and inventory of MAX706SESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706SESA+ is usually 5 days.
3.What payment methods are accepted for MAX706SESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706SESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706SESA+?
MAX706SESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706SESA+ 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 MAX706SESA+?
For technical support, including MAX706SESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706SESA+ requirements.
6.How does Aetrix verify that MAX706SESA+ is sourced from the original manufacturer or authorized distributors?
All MAX706SESA+ 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 MAX706SESA+ meets industry standards.
7.What is the process for return or replacement of MAX706SESA+?
All MAX706SESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706SESA+, 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 MAX706SESA+ part is unused and in its original packaging.
Return procedure for MAX706SESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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