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Analog Devices Inc./Maxim Integrated MAX706ARESA+T
- Part No.:
- MAX706ARESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706ARESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,066
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Product details
Overview
MAX706ARESA+T 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 operates over –40°C to +85°C in 8-pin SO package and is used in battery-powered portable instruments and industrial controllers requiring reliable µP reset assurance.
For engineers reviewing the MAX706ARESA+T datasheet, MAX706ARESA+T pinout, MAX706ARESA+T application, or MAX706ARESA+T equivalent, key selection criteria include its 2.93V reset threshold, guaranteed RESET assertion down to VCC = 1V, 200ms reset pulse width, and compatibility with TTL/CMOS logic levels across supply voltages from 2.7V to 5.5V.
Technical Context
The MAX706ARESA+T 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 watchdog timer resets on WDI transitions and asserts WDO low after 1.6s timeout - a fixed period independent of VCC within specified operating range.
Reset assertion is guaranteed for VCC ≥1V; the internal reset generator holds RESET low for 200ms after VCC rises above threshold or MR release. The manual-reset input features 70µA internal pullup and accepts 500ns minimum pulse width at 3V, enabling robust pushbutton or logic-driven reset initiation.
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 - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s - provides deterministic fail-safe response if firmware fails to service WDI |
| Supply Current | 100µA typical - enables ultra-low-power operation in battery-backed applications |
| PFI Threshold | 1.25V - enables flexible power-fail or low-battery warning via external resistive divider |
| Operating Voltage Range | 2.7V to 5.5V - supports dual-supply systems (e.g., +3.3V core with +5V I/O) |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded deployment |
Pinout & Package
MAX706ARESA+T is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard reflow profiles and IPC-7351B footprint requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Internally pulled up with 70µA; accepts TTL/CMOS logic; 500ns min pulse width at 3V |
| 2 VCC | Positive supply input | Accepts 2.7V–5.5V; bypass with 0.1µF capacitor to GND for noise immunity |
| 3 GND | Ground reference | Common return for all internal circuits and output drivers |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; trips when input falls below 1.25V |
| 5 PFO | Active-low power-fail output | Sinks current when PFI < 1.25V; used for early-warning interrupt or cascaded reset |
| 6 WDO | Active-low watchdog output | Asserts low if WDI not toggled within 1.6s; also asserts on VCC brownout |
| 7 RESET | Active-low reset output | Guaranteed low for VCC ≥1V; deasserts 200ms after VCC > 2.93V or MR release |
| 8 WDI | Watchdog input | Edge-sensitive; toggling resets watchdog timer; high-impedance state disables watchdog in MAX706AR variant |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP runaway |
| Debounced manual reset input | Eliminates need for external RC debounce circuitry; supports direct pushbutton interface |
| WDI disable capability | Watchdog automatically disables when WDI is left open or driven high-impedance (<600nA leakage) |
| 1.25V precision PFI reference | Enables accurate power-fail detection across varying supply rails using simple resistor networks |
| 200ms reset time delay | Meets JEDEC JESD84-B51 requirement for NAND flash boot stability and µP initialization timing |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and provides reset signal to ARM Cortex-M0 MCU during battery sag or charge interruption. Use Value: Prevents corrupted EEPROM writes and sensor calibration errors during transient undervoltage events. |
Use Scenario: PLC I/O module operating in factory environment with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Generates clean, timed reset pulse to FPGA configuration logic upon 3.3V rail stabilization after power-on. Use Value: Eliminates metastability risk during FPGA bitstream loading and guarantees deterministic startup sequence. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Fanless edge computing gateway with dual-supply design (3.3V core, 5V I/O). IC Role / Device Role / Timing Role: Monitors both rails independently via PFI divider network and asserts system-wide reset if either drops out. Use Value: Enables graceful shutdown and persistent state save before loss of critical 3.3V domain power. |
Use Scenario: Medical diagnostic device requiring FDA-compliant power integrity monitoring. IC Role / Device Role / Timing Role: Provides redundant reset supervision with watchdog timeout independent of software execution path. Use Value: Meets IEC 62304 Class C safety requirement for hardware-initiated recovery from firmware lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA | Same 2.93V reset threshold and SO-8 package, but commercial temperature range (0°C to +70°C) | Limited to non-industrial environments; lacks extended temp qualification | Select when cost sensitivity outweighs industrial temp requirement and board-level thermal management is sufficient |
| TPS3808G33DBVR | 2.93V threshold, 200ms delay, but no watchdog or PFI/PFO functions; lower quiescent current (1.1µA) | Only basic reset supervision; no fail-safe watchdog or power-fail warning capability | Choose when only reset generation is needed and ultra-low standby power is critical |
Compared with MAX706RCSA, MAX706ARESA+T adds industrial temperature support and identical functionality; compared with TPS3808G33DBVR, it delivers integrated watchdog and power-fail monitoring at higher quiescent current but broader system protection scope.
Availability
MAX706ARESA+T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and embedded computing systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ARESA+T 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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX706 family delivers low-cost, highly integrated µP supervisory functions-including reset, watchdog, and power-fail detection-for resource-constrained embedded systems where reliability and small footprint are essential.
FAQ
What is the reset threshold voltage for MAX706ARESA+T?
The MAX706ARESA+T has a nominal reset threshold voltage of 2.93V, with ±1.5% tolerance over temperature and supply variations. This value is factory-trimmed and guaranteed across the full –40°C to +85°C operating range. The threshold applies to VCC falling conditions and includes 20mV hysteresis to prevent chatter near trip point. MAX706ARESA+T uses the 'S' suffix designation, confirming its 2.93V specification per Maxim's ordering matrix.
Does MAX706ARESA+T include a watchdog timer function?
Yes, MAX706ARESA+T includes a fully functional watchdog timer with a fixed 1.6s timeout period. The watchdog 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 base MAX706R series, the 'A' variant (MAX706AR/AS/AT) allows watchdog disable by leaving WDI open or connecting it to a high-impedance tri-state output with leakage <600nA - a feature confirmed in the datasheet's Pin Description and Watchdog Timer sections for MAX706ARESA+T.
What package type and footprint does MAX706ARESA+T use?
MAX706ARESA+T is supplied in an 8-pin SO (Small Outline) package, identified by pkg code S8-2 in Maxim's ordering information. It measures 4.9mm × 3.9mm with 1.27mm lead pitch and is RoHS-compliant and lead-free. The pinout matches standard SO-8 footprints, and the device is compatible with automated pick-and-place and reflow soldering per IPC-J-STD-020. This package is explicitly listed for MAX706ARESA+T in the Ordering Information table on page 10 of the datasheet.
Can MAX706ARESA+T monitor a secondary power supply like +12V?
Yes, MAX706ARESA+T can monitor secondary supplies such as +12V using its PFI (Power-Fail Input) pin. By connecting PFI to a resistive divider from the +12V rail, the internal 1.25V comparator threshold allows setting custom trip points - e.g., 11V as shown in Figure 5 of the datasheet. When PFI falls below 1.25V, PFO goes low and can be connected to MR to trigger a system reset. This capability is documented in the Applications Information section and Typical Operating Circuits, confirming direct applicability to MAX706ARESA+T.
What is the minimum VCC level at which MAX706ARESA+T guarantees RESET assertion?
MAX706ARESA+T guarantees RESET output remains asserted (low) down to VCC = 1V, as explicitly stated in the Features list and Reset Generator section of the datasheet. Below 1V, the RESET driver enters high-impedance state; however, for reliable operation down to 0V, a 100kΩ pulldown resistor on the RESET line is recommended (per Figure 6). This guarantee ensures fail-safe reset behavior during severe brownout conditions common in battery-depleted or unregulated supply scenarios.
MAX706ARESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MAX706ARESA+T FAQ
1.How can I place an order for MAX706ARESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ARESA+T 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 MAX706ARESA+T reliable?
The price and inventory of MAX706ARESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ARESA+T is usually 5 days.
3.What payment methods are accepted for MAX706ARESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ARESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ARESA+T?
MAX706ARESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ARESA+T 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 MAX706ARESA+T?
For technical support, including MAX706ARESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ARESA+T requirements.
6.How does Aetrix verify that MAX706ARESA+T is sourced from the original manufacturer or authorized distributors?
All MAX706ARESA+T 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 MAX706ARESA+T meets industry standards.
7.What is the process for return or replacement of MAX706ARESA+T?
All MAX706ARESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ARESA+T, 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 MAX706ARESA+T part is unused and in its original packaging.
Return procedure for MAX706ARESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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