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Analog Devices Inc./Maxim Integrated MAX706EPA+
- Part No.:
- MAX706EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:669
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Product details
Overview
MAX706EPA+ from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin PDIP package, providing active-low reset output, 1.6s watchdog timer, 4.40V supply-voltage monitor threshold, 1.25V power-fail comparator input, and debounced manual-reset input. It ensures reliable μP startup and brownout recovery in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX706EPA+ datasheet, MAX706EPA+ pinout, MAX706EPA+ application, or MAX706EPA+ equivalent, this page delivers verified functional identity, temperature-rated operating parameters (–40°C to +85°C), reset pulse width (200ms), watchdog timeout (1.6s), and precise voltage thresholds - all confirmed for the MAX706EPA+ variant specifically.
Technical Context
The MAX706EPA+ integrates four independent supervisory functions on a single die: a precision bandgap-based reset generator with hysteresis, a monostable watchdog timer triggered by WDI edge transitions, a high-impedance 1.25V reference-comparator for PFI monitoring, and an internal 250μA MR pull-up with TTL/CMOS-compatible input threshold (0.8V low, 2.0V high). All logic outputs are push-pull with guaranteed sink capability (3.2mA) and source compliance (VCC – 1.5V).
Its reset assertion is guaranteed valid down to VCC = 1V, and the 4.40V reset threshold applies exclusively to MAX706/MAX708 variants - distinct from the 4.65V threshold of MAX705/MAX707/MAX813L. The device operates across VCC = 4.5V to 5.5V and draws only 150–500μA quiescent current over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers reset during brownout when +5V supply drops below nominal regulation limit. |
| Watchdog Timeout | 1.60s ±0.65s - provides fail-safe recovery if μP fails to toggle WDI within defined window. |
| Reset Pulse Width | 200ms typical - ensures sufficient duration for μP initialization and peripheral stabilization. |
| Power-Fail Input Threshold | 1.25V ±0.05V - enables accurate early-warning detection of falling VCC or auxiliary supply rails. |
| Supply Current | 150–500μA - ultra-low quiescent draw supports battery-backed or energy-constrained systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability without derating. |
| VCC Range | 4.5V to 5.5V - matches standard +5V linear regulator output tolerances. |
Pinout & Package
MAX706EPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up at 250μA; debounces switch inputs via 140ms minimum pulse width. |
| 2 (VCC) | +5V Supply Input | Main power rail connection; supports operation from 4.5V to 5.5V; reset remains valid down to 1V. |
| 3 (GND) | Ground Reference | Common return path for all analog and digital circuitry; required for accurate threshold referencing. |
| 4 (PFI) | Power-Fail Input | High-impedance comparator input referenced to 1.25V; used to monitor auxiliary supplies or generate early power-fail warnings. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output; sinks current when PFI < 1.25V; can interrupt μP or drive external logic. |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling clears internal 1.6s timer; floating or high-Z disables watchdog function. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for ≥200ms during power-up/brownout; guaranteed logic low ≤0.4V at 3.2mA sink. |
| 8 (WDO) | Watchdog Output | Active-low push-pull output; goes low on timeout or VCC undervoltage; no minimum pulse width; rises immediately when VCC recovers. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery-depleted conditions. |
| 200ms reset pulse width | Meets μP reset timing requirements for full initialization of internal registers and peripherals. |
| Debounced MR input | Eliminates need for external RC filtering or Schmitt-trigger circuits when using mechanical switches. |
| 1.25V precision PFI threshold | Enables accurate monitoring of non-5V rails (e.g., +3.3V, +12V, or negative supplies) via resistor dividers. |
| Watchdog timeout with edge-triggered clear | Prevents spurious timeouts from noise; allows flexible software-driven watchdog servicing. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors +5V supply and auxiliary +12V rail in a DIN-rail mounted programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 core and driving PFO interrupt to initiate graceful I/O shutdown before power loss. Use Value: Prevents firmware corruption during line sags by guaranteeing 200ms reset hold time and detecting pre-failure voltage droop via PFI divider. |
Use Scenario: Embedded subsystem in portable ultrasound unit requiring battery-backed operation and fail-safe boot sequence. IC Role / Device Role / Timing Role: Provides brownout reset and watchdog supervision for TI C6748 DSP; MR tied to emergency stop button; PFI monitors Li-ion cell voltage via resistive divider. Use Value: Enables safe power-down sequencing and prevents erratic behavior during battery discharge below 3.3V, leveraging 1.25V comparator accuracy. |
| Automotive Body Control Module | Networked Industrial Sensor Node |
Use Scenario: Power management in under-hood BCM subjected to cold cranking (4.2V min) and load dump transients. IC Role / Device Role / Timing Role: Resets microcontroller during cold-crank undervoltage; WDO connected to MR to force hard reset on watchdog timeout; PFO alerts CAN transceiver of imminent power loss. Use Value: Maintains functional safety integrity by enforcing strict 4.40V reset threshold and eliminating false resets via hysteresis. |
Use Scenario: LoRaWAN edge node powered by solar-charged supercapacitor with intermittent energy availability. IC Role / Device Role / Timing Role: Supervises buck converter output; uses MR to initiate firmware update mode; PFI detects capacitor voltage decay to trigger sleep-to-wake transition. Use Value: Extends operational uptime by enabling controlled wake-up from ultra-low-power state using precise 1.25V comparator threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CPA | Same functionality but rated for 0°C to +70°C commercial temperature range; identical 4.40V reset threshold and 1.6s watchdog. | Limited to indoor, non-industrial environments; unsuitable for extended thermal cycling or automotive under-hood use. | Select MAX706CPA only for cost-sensitive consumer or lab equipment where ambient temperature stays within 0–70°C. |
| MAX706ESA | Identical electrical specs and temperature rating (–40°C to +85°C), but in 8-pin SO surface-mount package instead of PDIP. | Requires PCB rework for SMT assembly; lacks through-hole mechanical robustness for high-vibration environments. | Choose MAX706ESA for space-constrained or automated production designs where board real estate or assembly process favors SOIC. |
Compared with MAX706CPA and MAX706ESA, the MAX706EPA+ offers through-hole PDIP packaging for prototyping and ruggedized industrial deployment, while retaining full functional equivalence and industrial temperature qualification - making it optimal for field-serviceable or vibration-prone applications.
Availability
MAX706EPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and networked sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX706EPA+ 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 to replace discrete reset and watchdog circuits in μP-based systems, delivering integrated supervision with guaranteed timing, precision thresholds, and industrial-grade reliability.
FAQ
What is the reset threshold voltage for MAX706EPA+?
The MAX706EPA+ has a nominal reset threshold of 4.40V, with a guaranteed range of 4.25V to 4.50V across its –40°C to +85°C operating temperature range. This value is specific to the MAX706/MAX708 variants and differs from the 4.65V threshold of MAX705/MAX707/MAX813L. The MAX706EPA+ uses this lower threshold to provide earlier reset assertion during marginal +5V supply conditions.
Does MAX706EPA+ include a watchdog timer?
Yes, the MAX706EPA+ includes a fully functional watchdog timer with a nominal timeout period of 1.6 seconds. The timer is cleared on any rising or falling edge at the WDI pin, and asserts WDO low upon timeout. Unlike RESET, WDO has no minimum pulse width and returns high immediately when VCC rises above the reset threshold - a behavior confirmed in the MAX706EPA+ datasheet timing diagrams.
Can MAX706EPA+ monitor voltages other than +5V?
Yes, the MAX706EPA+ can monitor auxiliary voltages via its PFI pin, which compares input voltage against an internal 1.25V reference. By connecting a resistor divider from the target supply (e.g., +12V or +3.3V) to PFI, users can configure early-warning detection for power-fail or low-battery conditions. The MAX706EPA+ datasheet explicitly confirms this capability and provides design examples for multi-rail monitoring.
What is the minimum VCC required for guaranteed RESET output validity in MAX706EPA+?
The MAX706EPA+ guarantees valid RESET output down to VCC = 1V - meaning the RESET pin will remain a logic-low output ≤0.4V while sinking 3.2mA, even as the supply voltage collapses. This specification is explicitly stated in the Electrical Characteristics table for MAX706E/M variants and is critical for ensuring deterministic behavior during deep brownout or battery-depletion scenarios.
Is MAX706EPA+ RoHS-compliant and lead-free?
Yes, the "+" suffix in MAX706EPA+ denotes lead(Pb)-free and RoHS-compliant packaging per Maxim Integrated's ordering conventions. The device uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. This compliance is documented in the Ordering Information section and Package Information tables of the official MAX706EPA+ datasheet.
MAX706EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX706EPA+ FAQ
1.How can I place an order for MAX706EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706EPA+ 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 MAX706EPA+ reliable?
The price and inventory of MAX706EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706EPA+ is usually 5 days.
3.What payment methods are accepted for MAX706EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706EPA+?
MAX706EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706EPA+ 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 MAX706EPA+?
For technical support, including MAX706EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706EPA+ requirements.
6.How does Aetrix verify that MAX706EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX706EPA+ 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 MAX706EPA+ meets industry standards.
7.What is the process for return or replacement of MAX706EPA+?
All MAX706EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706EPA+, 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 MAX706EPA+ part is unused and in its original packaging.
Return procedure for MAX706EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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