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Analog Devices Inc./Maxim Integrated MAX706ESA+
- Part No.:
- MAX706ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706ESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
MAX706ESA+ from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timer, 4.40V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX706ESA+ datasheet, MAX706ESA+ pinout, MAX706ESA+ application, or MAX706ESA+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (200ms reset pulse width, 140–280ms min/max), supply-voltage validity down to VCC = 1V, and validated alternatives for 4.40V-reset supervisory replacement.
Technical Context
The MAX706ESA+ integrates four core supervisory functions on a single die: a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis, a watchdog timer triggered by WDI edge transitions with 1.00–2.25s timeout window, a dedicated 1.25V reference-based power-fail comparator (PFI/PFO), and TTL/CMOS-compatible manual-reset input with internal 250μA pull-up.
Its RESET output remains valid and guaranteed low (≤0.4V) at VCC as low as 1V, enabling robust reset assertion during deep brownout. The device operates across –40°C to +85°C and draws only 150–500μA quiescent current, making it suitable for battery-backed and thermally demanding applications without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when VCC drops below nominal 4.40V, with built-in hysteresis to prevent chatter during slow supply decay. |
| Reset Pulse Width | 200ms typical - ensures sufficient duration to fully initialize microprocessors like 80C51 or ARM Cortex-M0 before release. |
| Watchdog Timeout | 1.60s typical (1.00–2.25s range) - provides deterministic software-alive monitoring with edge-triggered clearing via WDI toggling. |
| Power-Fail Input Threshold | 1.25V ±50mV - enables accurate early-warning detection of +5V rail collapse or monitoring of auxiliary supplies via external resistor divider. |
| Supply Current | 150–500μA - ultra-low quiescent draw supports long-term operation in battery-critical systems without compromising supervision integrity. |
| VCC Validity Range | 1.0V to 5.5V - guarantees functional RESET output even during severe undervoltage conditions where most μPs are non-operational. |
| Manual-Reset Input | Debounced, TTL/CMOS-compatible with 250μA internal pull-up - eliminates need for external RC debounce network when using pushbutton switches. |
Pinout & Package
MAX706ESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and JEDEC MS-012AC outline. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-Low Manual-Reset Input | Drives reset pulse when pulled below 0.8V; internally pulled up with 250μA - compatible with logic lines or momentary switches without external components. |
| 2 VCC | +5V Supply Input | Primary power rail connection; device monitors this voltage for reset generation and powers all internal circuits including watchdog and comparator. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance to ensure accurate threshold detection and noise immunity. |
| 4 PFI | Power-Fail Input | Non-inverting input of comparator referenced to 1.25V; used to monitor secondary supplies (e.g., +12V via divider) or detect battery depletion. |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserting when PFI < 1.25V; sinks current to signal impending supply failure to μP interrupt line. |
| 6 WDI | Watchdog Input | Edge-sensitive input that clears internal 1.6s timer on rising/falling transition; floating or high-Z disables watchdog function entirely. |
| 7 RESET | Active-Low Reset Output | Guaranteed logic-low (≤0.4V) for ≥200ms after power-up, brownout, or MR assertion; remains low until VCC exceeds 4.40V + hysteresis. |
| 8 WDO | Watchdog Output | Open-drain active-low output asserting on watchdog timeout or VCC drop below reset threshold; no minimum pulse width - responds immediately to VCC rise. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures fail-safe reset assertion even during deep brownout, preventing undefined μP state when main supply collapses below 2V. |
| Integrated 1.25V precision reference | Enables accurate, temperature-stable power-fail warning without external references - critical for battery voltage monitoring in portable instruments. |
| Debounced MR input with 250μA pull-up | Eliminates need for external RC network or Schmitt trigger, reducing BOM count and PCB area while ensuring clean reset initiation from mechanical switches. |
| Independent watchdog and reset paths | Allows watchdog timeout to trigger reset only if WDO is externally connected to MR - provides design flexibility for safety-critical vs. diagnostic use cases. |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow-rising or noisy supply rails, improving system stability in industrial environments with fluctuating input voltages. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
|
Use Scenario: Programmable logic controllers operating in factory-floor environments with unstable 24V DC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during AC line sags or switching regulator dropout, holding μP in known state until stable VCC is restored. Use Value: Prevents spurious I/O writes or corrupted register states during brownout, eliminating need for external POR circuitry and reducing firmware recovery complexity. |
Use Scenario: Portable ultrasound or ECG units powered by rechargeable Li-ion batteries with dual-rail regulation (+5V and +3.3V). IC Role / Device Role / Timing Role: Monitoring both main +5V rail (via VCC) and battery voltage (via PFI divider) to initiate orderly shutdown before critical voltage thresholds are breached. Use Value: Enables safe data save and hardware disable prior to power loss, meeting IEC 62304 Class B software safety requirements for medical devices. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: BCMs subjected to load-dump transients and cold-crank conditions causing VCC to dip below 4.4V for >100ms. IC Role / Device Role / Timing Role: Providing deterministic 200ms reset pulse synchronized to VCC recovery, ensuring microcontroller reinitialization only after stable supply is confirmed. Use Value: Avoids partial initialization or flash corruption during engine start cycles, satisfying ISO 16750-2 electrical stress test compliance. |
Use Scenario: Revenue-grade meters requiring tamper-proof power-loss logging and secure metering data retention during grid outages. IC Role / Device Role / Timing Role: Using PFO to trigger backup SRAM write-enable and RTC clock hold while VCC decays, then asserting RESET to freeze CPU execution before VCC < 1V. Use Value: Guarantees atomic storage of last-valid kWh reading and timestamp, fulfilling ANSI C12.1 and IEC 62053-21 metrology certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA | Same functionality and pinout, but rated for 0°C to +70°C industrial temperature range instead of –40°C to +85°C. | Not suitable for automotive or outdoor industrial deployments requiring extended temperature operation. | Select MAX706CSA only for cost-sensitive commercial applications with controlled ambient environments. |
| MAX809SEUR+T | Dedicated reset-only IC (no watchdog or PFI/PFO); 4.40V threshold; SOT23-3 package; no manual reset or power-fail features. | Lacks watchdog timer, power-fail comparator, and MR input - cannot replace full supervisory functionality of MAX706ESA+. | Use MAX809SEUR+T only when only basic reset supervision is needed and board space is severely constrained. |
Compared with MAX706CSA and MAX809SEUR+T, the MAX706ESA+ uniquely combines extended temperature rating, integrated watchdog, power-fail warning, and manual reset in a single 8-pin SO package - making it the only drop-in solution for full-feature supervisory replacement in harsh-environment designs.
Availability
MAX706ESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ESA+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX705–MAX708 family was designed specifically to consolidate power-supply monitoring, reset generation, watchdog supervision, and power-fail warning into one compact IC - targeting cost-sensitive, space-constrained embedded systems requiring high reliability without discrete supervision components.
FAQ
What is the reset threshold voltage of the MAX706ESA+?
The MAX706ESA+ has a nominal reset threshold of 4.40V, with a guaranteed tolerance of ±150mV (4.25V to 4.50V) over its full operating temperature range of –40°C to +85°C. This threshold is factory-trimmed and does not require external calibration. The device asserts active-low RESET whenever VCC falls below this threshold and holds it low until VCC rises above the threshold plus 40mV hysteresis.
Does the MAX706ESA+ include a watchdog timer?
Yes, the MAX706ESA+ includes a watchdog timer with a nominal timeout period of 1.60 seconds (range: 1.00–2.25s). It is edge-triggered via the WDI pin - any rising or falling transition clears the timer. If WDI remains static for longer than the timeout, WDO goes low. The watchdog can be disabled by leaving WDI floating or connecting it to a high-impedance buffer.
Can the MAX706ESA+ monitor voltages other than VCC?
Yes, the MAX706ESA+ can monitor auxiliary voltages using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting a resistor divider from the target voltage to PFI, users can configure early-warning detection for +12V rails, battery levels, or negative supplies. The PFO output asserts low when the divided voltage falls below 1.25V.
What is the minimum VCC required for valid RESET output from the MAX706ESA+?
The MAX706ESA+ guarantees valid RESET output down to VCC = 1.0V. At this level, RESET remains a guaranteed logic low (≤0.4V) with sink capability, enabling robust reset assertion during deep brownout conditions where many microcontrollers lose functionality. This specification is tested and guaranteed across the full –40°C to +85°C temperature range.
Is the MAX706ESA+ pin-compatible with other members of the MAX705–MAX708 family?
Yes, the MAX706ESA+ shares identical pinout and package (8-pin SO) with MAX705ESA+, MAX707ESA+, MAX708ESA+, and MAX813LESA+. However, functional differences exist: MAX705/MAX706 include watchdog + active-low RESET; MAX707/MAX708 add active-high RESET; MAX813L substitutes RESET for RESET. Direct substitution requires verification of required features per application.
MAX706ESA+ 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:
- 4.4V
- 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
MAX706ESA+ FAQ
1.How can I place an order for MAX706ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ESA+ 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 MAX706ESA+ reliable?
The price and inventory of MAX706ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ESA+ is usually 5 days.
3.What payment methods are accepted for MAX706ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ESA+?
MAX706ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ESA+ 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 MAX706ESA+?
For technical support, including MAX706ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ESA+ requirements.
6.How does Aetrix verify that MAX706ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX706ESA+ 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 MAX706ESA+ meets industry standards.
7.What is the process for return or replacement of MAX706ESA+?
All MAX706ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ESA+, 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 MAX706ESA+ part is unused and in its original packaging.
Return procedure for MAX706ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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