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Analog Devices Inc./Maxim Integrated MAX706PESA
- Part No.:
- MAX706PESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706PESA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,786
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Product details
Overview
MAX706PESA from Maxim Integrated is an active-high reset, +3V microprocessor supervisory circuit with integrated watchdog timer, 1.25V power-fail comparator, and manual reset input. It monitors VCC for power-up, brownout, and power-down conditions; asserts RESET for ≥200ms; features 1.6s watchdog timeout; and operates from 2.7V to 5.5V supply. Used in battery-powered portable instruments requiring reliable µP reset and early power-fail warning.
For engineers reviewing the MAX706PESA datasheet, MAX706PESA pinout, MAX706PESA application, or MAX706PESA equivalent, this page delivers verified functional identity, exact reset threshold (2.63V), active-high RESET behavior, watchdog enable/disable logic, PFI/PFO comparator operation, and validated alternative part selection - all grounded in Maxim's official specifications.
Technical Context
The MAX706PESA implements a precision voltage-monitoring architecture with a dedicated 2.63V reset threshold detector, internal 200ms reset timer, and independent 1.6s watchdog timer that resets on WDI transitions. Its PFI input connects to an internal 1.25V reference comparator, enabling configurable power-fail or low-battery detection via external resistive dividers.
RESET assertion is guaranteed down to VCC = 1V; output drive meets TTL/CMOS levels across 2.7V–5.5V VCC range. The WDI input supports disable-on-open functionality (leakage <600nA), distinguishing it from non-A variants. MR input is debounced and internally pulled up with ~70µA current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset initiation before µP operational voltage collapse |
| Reset Pulse Width | 200ms minimum; guarantees sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; provides deterministic software activity monitoring window |
| Supply Current | 100µA typical at +25°C; enables long battery life in portable systems |
| PFI Threshold | 1.25V ±0.05V; fixed internal reference for accurate power-fail or low-battery warning |
| Operating Voltage Range | 2.7V to 5.5V; supports dual-supply systems (e.g., +3.3V µP with +5V adapter) |
| Reset Output Polarity | Active-high RESET only; directly interfaces with µP reset inputs requiring high-asserted reset |
Pinout & Package
MAX706PESA is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compatible, with 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low TTL/CMOS-compatible input; internally pulled up (~70µA); 500ns min pulse width at 3V |
| 2 (VCC) | Supply Voltage Input | Primary power rail (2.7V–5.5V); RESET asserted when VCC < 2.63V |
| 3 (GND) | Ground Reference | System ground return; required for all internal comparators and outputs |
| 4 (PFI) | Power-Fail Comparator Input | Connects to external resistor divider; triggers PFO when voltage falls below 1.25V |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output; sinks current when PFI < 1.25V; used for µP interrupt or MR assertion |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; disables when left open or high-Z (<600nA leakage) |
| 7 (WDO) | Watchdog Output | Active-low open-drain output; asserts when WDI timeout occurs or VCC drops below reset threshold |
| 8 (RESET) | Reset Output | Active-high push-pull output; remains high during VCC < 2.63V or MR low; deasserts 200ms after recovery |
Key Features
| Feature | Design Value |
|---|---|
| Active-High Reset Output | Eliminates need for external inverter when interfacing with µPs requiring high-asserted reset signals |
| Configurable Power-Fail Detection | 1.25V internal reference + external PFI divider enables precise early-warning of unregulated supply collapse |
| Watchdog Disable on Open | WDI automatically disables watchdog when floating or connected to tri-state I/O, simplifying debug and boot modes |
| Guaranteed RESET Assertion to VCC = 1V | Ensures robust reset hold-down during deep brownout, preventing µP runaway before full power loss |
| 200ms Debounced Manual Reset | Hardware-enforced timing eliminates need for firmware debounce or external RC networks |
Applications
| Battery-Powered Portable Instruments | Critical µP Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter operating from single 3.7V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC providing active-high reset, 200ms power-up delay, and PFI-based low-battery warning at 3.2V. Use Value: Prevents erroneous measurements during brownout by holding µP in reset until stable VCC > 2.63V; PFO triggers graceful shutdown before cell depletion. |
Use Scenario: Industrial PLC controller with dual 3.3V/5V rails and watchdog-critical firmware. IC Role / Device Role / Timing Role: Primary reset supervisor asserting active-high RESET and monitoring µP software liveness via 1.6s WDI timeout. Use Value: Guarantees safe restart on power interruption; WDO-to-MR feedback loop initiates hardware reset on software hang without NMI conflict. |
| Computers & Embedded Controllers | Intelligent Test Equipment |
Use Scenario: Compact x86 SBC powered by 3.3V LDO with optional 5V USB host mode. IC Role / Device Role / Timing Role: Voltage monitor ensuring µP reset during 3.3V rail instability and supporting 5V-compatible MR input. Use Value: Maintains reset integrity across both supply configurations; 100µA quiescent current minimizes standby drain on battery-backed systems. |
Use Scenario: Automated calibration system using µP to control DACs, ADCs, and relays under varying line conditions. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET generator during AC dropout and PFO-triggered data save via MR before power loss. Use Value: Enables deterministic last-action execution (e.g., EEPROM save) upon detected unregulated supply sag, preserving measurement integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RESA | Active-low RESET output; identical 2.63V threshold, 200ms delay, and watchdog timing | Requires µP with active-low reset input; no level-shifting needed | Select when target µP reset pin is active-low and board layout cannot accommodate inverter or pull-up |
| MAX706APESA | Same active-high RESET and 2.63V threshold, but adds WDI disable-on-open feature (leakage <600nA) | Enables watchdog bypass during bootloader or debug without external switch | Prefer when system requires runtime watchdog disable capability without PCB modification |
Compared with MAX706PESA, MAX706RESA offers identical supervision accuracy but inverted reset polarity, while MAX706APESA adds configurable watchdog disable-making it more flexible for development-phase systems where watchdog behavior must adapt dynamically.
Availability
MAX706PESA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX706PESA 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, sensing, and interface applications, with emphasis on reliability and integration for embedded systems.
The MAX706 family targets cost-sensitive, space-constrained µP systems needing consolidated reset, watchdog, and power-fail functions in a single 8-pin package - optimized for portable, industrial, and computing applications.
FAQ
What is the reset threshold voltage of the MAX706PESA?
The MAX706PESA has a guaranteed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table. The MAX706PESA asserts its active-high RESET output whenever VCC drops below this threshold and holds it for ≥200ms after VCC recovers above 2.63V. This threshold is fixed and not adjustable.
Does the MAX706PESA include a watchdog timer, and how is it enabled or disabled?
Yes, the MAX706PESA includes a 1.6s watchdog timer monitored via the WDI pin. Unlike the MAX706APESA variant, the MAX706PESA watchdog cannot be disabled - it remains active whenever VCC is within specification. A rising or falling edge on WDI must occur within 1.6s to prevent WDO assertion. If WDI is left unconnected or driven high-impedance, the MAX706PESA watchdog continues running and will time out.
What is the function of the PFI and PFO pins on the MAX706PESA?
The PFI (Power-Fail Input) pin connects to an internal 1.25V comparator reference. When the voltage at PFI falls below 1.25V, the PFO (Power-Fail Output) pin goes low. This allows users to configure early power-fail or low-battery warnings by connecting PFI to a resistive divider from an unregulated rail. PFO is an active-low open-drain output and can be tied to MR to trigger a hardware reset before main supply collapse.
Can the MAX706PESA operate from a 3.3V supply, and what are its key performance limits at that voltage?
Yes, the MAX706PESA operates across 2.7V to 5.5V, including standard 3.3V systems. At VCC = 3.3V, it delivers 200ms reset pulse width, 2.63V reset threshold, 1.25V PFI reference, and 100µA typical supply current. RESET output VOH is ≥0.8 × VCC (≥2.64V) at 500µA sink, and VOL is ≤0.3V at 1.2mA sink - fully compatible with 3.3V TTL/CMOS logic families.
How does the manual reset (MR) input behave on the MAX706PESA?
The MR input on the MAX706PESA is active-low, TTL/CMOS-compatible, and internally pulled up with ~70µA. Driving MR below 0.6V (at VCC = 3.3V) triggers a full 200ms RESET pulse. Minimum MR pulse width is 500ns at 3V and 150ns at 5V. Leaving MR unconnected or tying it to VCC disables manual reset. No external pull-up is required.
MAX706PESA 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706PESA FAQ
1.How can I place an order for MAX706PESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706PESA 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 MAX706PESA reliable?
The price and inventory of MAX706PESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706PESA is usually 5 days.
3.What payment methods are accepted for MAX706PESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706PESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706PESA?
MAX706PESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706PESA 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 MAX706PESA?
For technical support, including MAX706PESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706PESA requirements.
6.How does Aetrix verify that MAX706PESA is sourced from the original manufacturer or authorized distributors?
All MAX706PESA 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 MAX706PESA meets industry standards.
7.What is the process for return or replacement of MAX706PESA?
All MAX706PESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706PESA, 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 MAX706PESA part is unused and in its original packaging.
Return procedure for MAX706PESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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