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Analog Devices Inc./Maxim Integrated MAX706RESA+
- Part No.:
- MAX706RESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706RESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,699
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Product details
Overview
MAX706RESA+ 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, and debounced manual-reset input. It ensures reliable µP startup in battery-powered portable instruments and industrial controllers.
For engineers reviewing the MAX706RESA+ datasheet, MAX706RESA+ pinout, MAX706RESA+ application, or MAX706RESA+ equivalent, this page delivers verified functional identity, exact reset threshold (2.93V), watchdog timing (1.6s), PFI comparator reference (1.25V), and SO-8 package mapping - all confirmed from Maxim's official datasheet Rev 5 (2006).
Technical Context
The MAX706RESA+ integrates a precision voltage monitor with 20mV hysteresis, a monostable reset generator with guaranteed 200ms pulse width, and a transition-triggered watchdog timer that resets on WDI edge detection. Its internal 70µA MR pullup enables direct pushbutton interfacing without external components.
It features dual-comparator architecture: one monitors VCC against a trimmed 2.93V threshold for reset assertion, while the second compares PFI against a stable 1.25V reference for power-fail or low-battery warning. All outputs are CMOS/TTL-compatible and specified down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset assertion before µP supply drops below operational minimum for +3.3V systems |
| Reset Pulse Width | 200ms typical; guarantees sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; provides deterministic firmware supervision window without requiring external timing components |
| PFI Reference Voltage | 1.25V ±0.05V; enables accurate monitoring of auxiliary supplies (e.g., unregulated DC) via resistive divider |
| Quiescent Current | 100µA max at +25°C; supports long battery life in portable equipment |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded applications |
| VCC Range | 3.0V to 5.5V; compatible with both +3.3V and +5V µP rails |
Pinout & Package
MAX706RESA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | TTL/CMOS-compatible; internally pulled up with 70µA; 500ns min pulse width at 3V |
| 2 VCC | Positive supply input | Accepts 3.0V–5.5V; RESET asserted down to VCC = 1V |
| 3 GND | Ground reference | Common return for all analog and digital functions |
| 4 PFI | Power-fail comparator input | Compares external voltage to internal 1.25V reference; <25nA input bias |
| 5 PFO | Active-low power-fail output | Open-drain; sinks current when PFI < 1.25V; used for early-warning interrupt |
| 6 WDI | Watchdog input | Edge-sensitive; toggling required within 1.6s to prevent WDO assertion |
| 7 RESET | Active-low reset output | Push-pull; drives µP reset pin directly; 200ms delay after VCC rise above 2.93V |
| 8 WDO | Active-low watchdog output | Open-drain; asserts on WDI timeout or VCC brownout; deasserts immediately when VCC recovers |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior even during deep brownout conditions where other supervisors may release prematurely |
| Debounced manual-reset input | 140ms minimum internal reset pulse width eliminates need for external RC debounce circuitry |
| WDI disable on high-impedance state | Watchdog automatically disables when WDI floats or connects to tri-state I/O with leakage <600nA - prevents spurious timeouts during µP sleep |
| 1.25V precision PFI reference | Enables accurate, temperature-stable monitoring of secondary supplies (e.g., battery, unregulated rail) without external references |
| 20mV reset threshold hysteresis | Prevents oscillation during slow VCC ramp-up/down by ensuring clean, single-pulse reset assertion |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by 3.3V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main VCC and monitors battery voltage via PFI divider; generates 200ms reset pulse on power-up and brownout. Use Value: Prevents corrupted firmware execution during battery swap or low-voltage cutoff; PFO triggers graceful shutdown before brownout. |
Use Scenario: PLC I/O module operating in factory environment with noisy 24VDC supply converted to 3.3V. IC Role / Device Role / Timing Role: Monitors regulated 3.3V rail (2.93V threshold) and detects upstream 24V failure via PFI network. Use Value: Dual-failure detection enables immediate fault logging and safe I/O state hold; WDO alerts µP before full reset occurs. |
| Embedded Computing Systems | Critical µP Power Monitoring |
Use Scenario: Fanless industrial PC using +3.3V core supply and +5V I/O rail. IC Role / Device Role / Timing Role: Provides primary reset for CPU and uses WDI to supervise BIOS boot code execution flow. Use Value: 1.6s watchdog window catches hung boot sequences; MR allows front-panel reset without motherboard redesign. |
Use Scenario: Medical diagnostic device requiring fail-safe power sequencing and regulatory compliance. IC Role / Device Role / Timing Role: Guarantees RESET remains asserted until VCC ≥2.93V and holds for 200ms - meeting IEC 62304 power-on reliability requirements. Use Value: Eliminates need for external reset IC qualification; built-in hysteresis and 1V operation ensure deterministic behavior under marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Identical SO-8 package and pinout; same 2.93V reset threshold, but lacks watchdog timer (no WDI/WDO pins) | Suitable only where watchdog supervision is unnecessary; simpler BOM but no firmware hang protection | Select MAX706SESA+ if system relies solely on power-rail monitoring and manual reset, with no runtime µP activity checking |
| TPS3808G33DBVR | TI part with 3.3V reset threshold (±0.5%), 200ms delay, no PFI/PFO, no watchdog; SOT-23-6 package | Smaller footprint but missing power-fail warning and watchdog; requires external components for PFI-like functionality | Choose TPS3808G33DBVR only for space-constrained designs where PFI and WDI are unused and 3.3V threshold tolerance is acceptable |
Compared with MAX706SESA+, MAX706RESA+ adds critical watchdog supervision and power-fail warning capability without changing PCB layout; versus TPS3808G33DBVR, it delivers integrated dual-monitoring and failsafe reset timing in a functionally complete 8-pin SO package.
Availability
MAX706RESA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, industrial controllers, and embedded computing systems requiring stable component supply across extended temperature ranges.
Supply support for MAX706RESA+ 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 industrial, automotive, and communications applications, with emphasis on power management and reliability-critical functions.
The MAX706 family targets cost-sensitive, space-constrained microprocessor systems needing guaranteed power-on reset, brownout protection, and optional watchdog supervision - optimized for +3V/+3.3V operation.
FAQ
What is the exact reset threshold voltage for MAX706RESA+?
The MAX706RESA+ has a precisely trimmed reset threshold of 2.93V (minimum 2.85V, maximum 3.00V) when VCC falls. This value is guaranteed over the full -40°C to +85°C operating range and ensures reliable reset assertion before most +3.3V microprocessors drop out of specification. The threshold includes 20mV hysteresis to prevent chatter during slow supply ramps.
Does MAX706RESA+ include a watchdog timer, and what is its timeout period?
Yes, MAX706RESA+ includes a watchdog timer with a nominal timeout period of 1.6 seconds. The actual timeout ranges from 1.00s to 2.25s depending on supply voltage and temperature. The timer resets on any edge (rising or falling) at the WDI pin and asserts the open-drain WDO output low if no transition occurs within that window.
Can MAX706RESA+ monitor a secondary power supply such as a battery or unregulated rail?
Yes, MAX706RESA+ can monitor secondary supplies 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 target supply, users can set custom trip points - for example, detecting battery voltage drop below 3.0V or unregulated DC dropout before regulator failure.
What is the function of the PFO pin on MAX706RESA+?
The PFO (Power-Fail Output) pin on MAX706RESA+ is an active-low, open-drain output that asserts when the voltage at PFI falls below the internal 1.25V reference. It is commonly used to generate an interrupt to the microprocessor, enabling orderly shutdown, data save, or fault logging before main supply collapse - providing early warning beyond basic reset functionality.
Is MAX706RESA+ pin-compatible with other members of the MAX706 family?
Yes, MAX706RESA+ is pin-compatible with all 8-pin SO variants in the MAX706R/S/T and MAX706AR/AS/AT families (e.g., MAX706RCSA+, MAX706SESA+), sharing identical pinout, package (S8-2), and electrical interface. Differences are limited to reset threshold (2.93V), presence/absence of watchdog, and reset polarity - all implemented internally without affecting PCB layout.
MAX706RESA+ 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:
- 2.63V
- 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
MAX706RESA+ FAQ
1.How can I place an order for MAX706RESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RESA+ 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 MAX706RESA+ reliable?
The price and inventory of MAX706RESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RESA+ is usually 5 days.
3.What payment methods are accepted for MAX706RESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RESA+?
MAX706RESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RESA+ 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 MAX706RESA+?
For technical support, including MAX706RESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RESA+ requirements.
6.How does Aetrix verify that MAX706RESA+ is sourced from the original manufacturer or authorized distributors?
All MAX706RESA+ 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 MAX706RESA+ meets industry standards.
7.What is the process for return or replacement of MAX706RESA+?
All MAX706RESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RESA+, 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 MAX706RESA+ part is unused and in its original packaging.
Return procedure for MAX706RESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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