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Analog Devices Inc./Maxim Integrated MAX706ASEPA+
- Part No.:
- MAX706ASEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706ASEPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX706ASEPA+ 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 an 8-pin PDIP package and is used in battery-powered instruments and industrial controllers requiring reliable µP reset assurance.
For engineers reviewing the MAX706ASEPA+ datasheet, MAX706ASEPA+ pinout, MAX706ASEPA+ application, or MAX706ASEPA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed operating parameters, thermal range validation, and real-world design context - all derived from Maxim's official documentation for the precise part number.
Technical Context
The MAX706ASEPA+ implements a precision voltage-monitoring architecture with a fixed 2.93V reset threshold (±1.5% typical accuracy) and guaranteed RESET assertion down to VCC = 1V. Its internal timer enforces a 200ms reset pulse width after VCC exceeds threshold or MR release.
It integrates four independent analog/digital functions: a reset generator with hysteresis (20mV), a watchdog timer with WDI edge detection (100ns min pulse width at 2.7V), a 1.25V reference-based PFI comparator with <25nA input bias, and TTL/CMOS-compatible MR input with 70µA internal pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before µP supply dropout in +3.3V systems |
| Reset Pulse Width | 200ms minimum; guarantees sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s nominal; provides deterministic firmware hang detection without external timing components |
| Supply Current | 100µA typical at +25°C; enables low-power operation in battery-backed applications |
| PFI Threshold | 1.25V ±5%; supports accurate power-fail warning or low-battery detection via external resistor divider |
| Operating Temp | –40°C to +85°C; validated for industrial-grade embedded control and portable instrumentation |
| Reset Output Polarity | Active-low (RESET); directly interfaces with standard µP reset inputs requiring logic-low assertion |
Pinout & Package
MAX706ASEPA+ is housed in an 8-pin plastic DIP (PDIP) package (package code P8-1), through-hole mountable, lead-free compliant, with 0.3" body width and standard 0.1" pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up with 70µA current; debounces pushbutton switches |
| 2 (VCC) | Supply Voltage Input | Accepts +2.7V to +5.5V; powers all internal circuits including reset generator and watchdog |
| 3 (GND) | Ground Reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 (PFI) | Power-Fail Comparator Input | Monitors external voltage via resistive divider; asserts PFO when input falls below 1.25V |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output; signals early power degradation or low-battery condition |
| 6 (WDO) | Watchdog Output | Active-low open-drain signal; asserts if WDI not toggled within 1.6s; also triggers on VCC brownout |
| 7 (RESET) | Reset Output | Active-low push-pull output; asserted during power-up, brownout, or MR activation; held for ≥200ms |
| 8 (WDI) | Watchdog Input | Edge-sensitive input; rising or falling transition resets watchdog timer; high-impedance disables function in MAX706AS variant |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout conditions before supply collapse |
| WDI Disable on High-Z | Watchdog automatically disables when WDI is left floating or connected to tri-state outputs (<600nA leakage) |
| 200ms Reset Timing | Fixed internal delay eliminates need for external RC timing components and associated tolerance drift |
| 1.25V Precision PFI Reference | Enables accurate, temperature-stable power-fail or battery-voltage monitoring without external references |
| 100µA Quiescent Current | Minimizes standby power draw in always-on portable equipment and remote sensors |
Applications
| Battery-Powered Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by 3.3V Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Supervisory IC monitors main supply and triggers reset if voltage drops below 2.93V; PFI detects battery depletion via 1.25V comparator. Use Value: Prevents corrupted measurements or flash writes during low-voltage operation; extends usable battery life by enabling graceful shutdown. |
Use Scenario: PLC I/O modules operating in factory environments with noisy 24V DC supplies converted to +3.3V. IC Role / Device Role / Timing Role: Provides brownout reset and watchdog supervision for ARM Cortex-M microcontrollers managing fieldbus communication. Use Value: Eliminates spurious reboots caused by supply transients; ensures deterministic recovery after power interruption. |
| Portable Medical Devices | Embedded Computing Systems |
Use Scenario: Wearable ECG monitors with USB charging and battery backup, requiring continuous data integrity. IC Role / Device Role / Timing Role: Generates 200ms reset pulse on power-up and asserts PFO when battery voltage falls below safe operating level. Use Value: Guarantees clean µP startup and initiates emergency save routines before power loss. |
Use Scenario: Edge gateway devices using +3.3V SoCs with multiple peripherals and long firmware boot sequences. IC Role / Device Role / Timing Role: Monitors core supply and services watchdog via GPIO toggle; MR input allows remote reset via management interface. Use Value: Detects firmware hangs during network stack initialization; prevents silent failure in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Same 2.93V reset threshold and functions, but in 8-pin SO package (S8-2); no PDIP footprint compatibility | Preferred for surface-mount production; requires PCB redesign vs. MAX706ASEPA+'s through-hole layout | Select MAX706SESA+ only when migrating to SMT assembly and board space is constrained. |
| TPS3808G33DBVR | 2.93V reset threshold, 200ms delay, but no watchdog or PFI/PFO; lower quiescent current (1.8µA) | Suitable for basic reset-only applications; lacks dual-supervision capability of MAX706ASEPA+ | Choose TPS3808G33DBVR only if watchdog and power-fail warning are unnecessary and ultra-low IQ is critical. |
Compared with MAX706SESA+, MAX706ASEPA+ offers direct drop-in replacement in legacy through-hole designs; compared with TPS3808G33DBVR, it delivers integrated watchdog and power-fail monitoring at higher supply current - making it optimal for complex embedded systems requiring multi-fault supervision.
Availability
MAX706ASEPA+ is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ASEPA+ 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, computing, and communications markets.
The MAX706 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing robust, integrated power monitoring and reset supervision - especially where +3V/+3.3V operation and wide temperature range are required.
FAQ
What is the reset threshold voltage for MAX706ASEPA+?
The MAX706ASEPA+ has a fixed reset threshold of 2.93V (VCC falling), with ±1.5% typical accuracy over temperature. This value is factory-trimmed and applies across its full –40°C to +85°C operating range. The threshold ensures reliable reset assertion before most +3.3V microprocessors enter undefined states, and is confirmed in Maxim's official Electrical Characteristics table for the MAX706AS variant.
Does MAX706ASEPA+ include a watchdog timer?
Yes, MAX706ASEPA+ includes a 1.6s watchdog timer with WDI input and WDO output. The timer resets on any edge at WDI and asserts WDO low if no transition occurs within 1.6s. Unlike the base MAX706S, the MAX706ASEPA+ (as part of the MAX706AS series) supports watchdog disable when WDI is left open or connected to a high-impedance tri-state output with leakage <600nA - a feature confirmed in the Watchdog Input section of the datasheet.
What package type is used for MAX706ASEPA+?
MAX706ASEPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3" width and standard 0.1" pin pitch (package code P8-1). It is lead-free compliant and rated for –40°C to +85°C operation. This through-hole package is explicitly listed in the Ordering Information table for MAX706ASEPA+, distinguishing it from SO and µMAX variants of the same functional part.
Can MAX706ASEPA+ monitor a secondary power supply?
Yes, MAX706ASEPA+ can monitor a secondary supply using its PFI (Power-Fail Input) pin, which compares external voltage against an internal 1.25V reference. When PFI falls below 1.25V, PFO goes low - enabling early-warning detection of auxiliary rail collapse or battery depletion. This function is fully documented in the Power-Failure Comparator section and confirmed for MAX706ASEPA+ via its inclusion in the MAX706AS family specifications.
Is the reset output of MAX706ASEPA+ active-high or active-low?
The reset output of MAX706ASEPA+ is active-low (labeled RESET), as confirmed by its "S" suffix designation (MAX706S series) and Pin Description table. It remains low during power-up, brownout, or manual reset assertion, and deasserts high after ≥200ms once VCC exceeds 2.93V. This matches the behavior of MAX706R/S/T and MAX706AR/AS/AT variants - distinct from active-high MAX706P/AP parts.
MAX706ASEPA+ 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:
- 2.93V
- 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
MAX706ASEPA+ FAQ
1.How can I place an order for MAX706ASEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ASEPA+ 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 MAX706ASEPA+ reliable?
The price and inventory of MAX706ASEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ASEPA+ is usually 5 days.
3.What payment methods are accepted for MAX706ASEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ASEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ASEPA+?
MAX706ASEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ASEPA+ 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 MAX706ASEPA+?
For technical support, including MAX706ASEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ASEPA+ requirements.
6.How does Aetrix verify that MAX706ASEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX706ASEPA+ 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 MAX706ASEPA+ meets industry standards.
7.What is the process for return or replacement of MAX706ASEPA+?
All MAX706ASEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ASEPA+, 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 MAX706ASEPA+ part is unused and in its original packaging.
Return procedure for MAX706ASEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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