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Analog Devices Inc./Maxim Integrated MAX706ATEPA+
- Part No.:
- MAX706ATEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX706ATEPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
MAX706ATEPA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing power-on reset, watchdog timeout (1.6s), 1.25V power-fail detection, and debounced manual reset. It asserts RESET when VCC falls below 3.08V or MR is pulled low, with guaranteed reset assertion down to VCC = 1V and 200ms reset pulse width. Used in battery-powered portable instruments and industrial controllers requiring reliable µP startup and brownout protection.
For engineers reviewing the MAX706ATEPA+ datasheet, MAX706ATEPA+ pinout, MAX706ATEPA+ application, or MAX706ATEPA+ equivalent, key selection criteria include its 3.08V reset threshold, PDIP-8 package, -40°C to +85°C operating range, active-low RESET output, and integrated watchdog timer with WDI disable capability.
Technical Context
The MAX706ATEPA+ implements a precision voltage-monitoring architecture with a dedicated 3.08V reset comparator (20mV hysteresis), a 1.25V internal reference for PFI-based power-fail/low-battery warning, and a monostable watchdog timer triggered by WDI transitions. Its reset generator guarantees logic-level assertion at VCC ≥ 1V and holds RESET low for exactly 200ms after recovery.
It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V, 70µA internal MR pullup, and PFO output capable of sinking current when PFI < 1.25V. The WDO output goes low on watchdog timeout or VCC undervoltage, but unlike RESET, it returns high immediately upon VCC recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reliable reset assertion before 3.3V µP supply dropout |
| Reset Pulse Width | 200ms; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; detects µP lockup without requiring external timing components |
| Supply Current | 100µA typical at 3.3V; enables long battery life in portable applications |
| PFI Threshold | 1.25V ±0.05V; supports accurate power-fail warning or secondary supply monitoring |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended-environment deployment |
| VCC Range | 3.15V to 5.5V; compatible with both 3.3V and 5V system rails |
Pinout & Package
MAX706ATEPA+ is housed in an 8-pin plastic DIP (PDIP) package (package code P8-1), through-hole mountable with 0.3-inch body width and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-Low Manual Reset Input | TTL/CMOS-compatible; internally pulled up with 70µA; triggers 200ms RESET pulse when pulled ≤0.6V |
| 2 (VCC) | Positive Supply Input | Accepts 3.15V–5.5V; powers all internal comparators, timer, and outputs |
| 3 (GND) | Ground Reference | Common return path for VCC, PFI, MR, and all outputs |
| 4 (PFI) | Power-Fail Comparator Input | Monitors external voltage divider; asserts PFO when input falls below 1.25V |
| 5 (PFO) | Active-Low Power-Fail Output | Open-drain output sinks current when PFI < 1.25V; used for early-warning interrupt |
| 6 (WDO) | Active-Low Watchdog Output | Asserts low if WDI not toggled within 1.6s; also asserts on VCC undervoltage |
| 7 (RESET) | Active-Low Reset Output | Push-pull output; held low during power-up, brownout, or MR assertion; deasserts 200ms after recovery |
| 8 (WDI) | Watchdog Input | Edge-sensitive; transition resets watchdog timer; disabled when left open or connected to high-Z tri-state output |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during severe brownout conditions |
| WDI disable on high-impedance state | Eliminates false watchdog timeouts when µP enters sleep or tri-state mode |
| Debounced MR input with 140ms min pulse width | Rejects mechanical switch bounce without external RC filtering |
| 1.25V precision PFI reference with 10mV hysteresis | Enables stable power-fail detection with noise immunity in noisy environments |
| 200ms factory-trimmed reset timeout | Removes need for external RC timing network, improving board-level reliability |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA batteries with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and unregulated battery voltage via PFI divider; generates power-on reset and low-battery warning. Use Value: Prevents erratic µP operation during battery swap or adapter insertion; extends runtime by enabling graceful shutdown before brownout. |
Use Scenario: PLC I/O module operating in factory environment with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Provides fail-safe reset during line transients; uses PFO to trigger watchdog interrupt on auxiliary 5V rail sag. Use Value: Eliminates firmware crashes caused by undervoltage-induced memory corruption; meets IEC 61000-4-2/4-4 immunity requirements. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Single-board computer booting from SD card with optional USB power. IC Role / Device Role / Timing Role: Generates clean 200ms reset pulse on 3.3V rail stabilization; WDO connected to µP NMI pin for lockup recovery. Use Value: Guarantees deterministic boot sequence across power sources; reduces field failure rate due to incomplete initialization. |
Use Scenario: Medical sensor node with lithium coin-cell backup and primary 3.3V LDO. IC Role / Device Role / Timing Role: Monitors both main and backup supplies; asserts RESET on main rail collapse and triggers PFO-driven backup switchover. Use Value: Maintains data integrity during primary supply failure; satisfies ISO 13485 power continuity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706TEPA+ | Identical pinout, package, and electrical specs; same 3.08V reset threshold and -40°C to +85°C rating | No functional difference; direct second-source option with identical qualification | Select for supply chain diversification without design change |
| TPS3808G30DBVR | 3.0V reset threshold (±0.5%), 350ms reset delay, no watchdog timer, SOT-23-6 package | Lacks WDI/WDO functionality; smaller footprint but requires external timing for longer delays | Choose only if watchdog is unnecessary and board space is constrained |
Compared with MAX706TEPA+, the MAX706ATEPA+ offers identical functionality and sourcing flexibility; versus TPS3808G30DBVR, it retains critical watchdog supervision and matches the exact 3.08V threshold required for legacy 3.3V system compatibility, avoiding recalibration of power-rail margins.
Availability
MAX706ATEPA+ is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and embedded computing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ATEPA+ 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 markets, emphasizing high reliability and integration density.
The MAX706 family delivers cost-effective, single-chip µP supervision for 3V/3.3V systems, targeting applications where power-rail monitoring, reset generation, and watchdog safety are essential - especially in portable and harsh-environment deployments.
FAQ
What is the reset threshold voltage for MAX706ATEPA+?
The MAX706ATEPA+ has a factory-trimmed reset threshold of 3.08V (with ±75mV tolerance) that triggers RESET assertion when VCC falls below this level. This value is specifically selected for compatibility with 3.3V microprocessor systems, ensuring reset occurs before the µP's minimum operating voltage is violated. The threshold includes 20mV hysteresis to prevent chatter during slow supply ramps.
Does MAX706ATEPA+ include a watchdog timer function?
Yes, MAX706ATEPA+ integrates a watchdog timer with a nominal 1.6s timeout period. It monitors the WDI pin for transitions and asserts WDO low if no edge occurs within that window. The watchdog can be disabled by leaving WDI open or connecting it to a high-impedance tri-state output with leakage <600nA - a feature confirmed in the MAX706AT series datasheet and applicable to MAX706ATEPA+.
What package type is used for MAX706ATEPA+?
MAX706ATEPA+ is supplied in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and standard 0.1-inch pin spacing (package code P8-1). This through-hole package supports manual assembly, prototyping, and legacy board designs requiring robust mechanical mounting and thermal mass.
Can MAX706ATEPA+ monitor a secondary power supply?
Yes, MAX706ATEPA+ includes a dedicated PFI (Power-Fail Input) pin referenced to an internal 1.25V comparator. By connecting PFI to a resistive divider from any DC supply (e.g., 12V, 5V, or negative rail), the device generates a PFO low pulse when that supply drops below the programmed threshold - enabling low-battery detection, auxiliary rail monitoring, or early-warning power-fail interrupts.
What is the guaranteed minimum VCC level for RESET assertion in MAX706ATEPA+?
MAX706ATEPA+ guarantees RESET assertion down to VCC = 1V across its full -40°C to +85°C operating range. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may release reset prematurely, preventing unintended µP execution and memory corruption in safety-critical systems.
MAX706ATEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX706ATEPA+ FAQ
1.How can I place an order for MAX706ATEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ATEPA+ 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 MAX706ATEPA+ reliable?
The price and inventory of MAX706ATEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ATEPA+ is usually 5 days.
3.What payment methods are accepted for MAX706ATEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ATEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ATEPA+?
MAX706ATEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ATEPA+ 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 MAX706ATEPA+?
For technical support, including MAX706ATEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ATEPA+ requirements.
6.How does Aetrix verify that MAX706ATEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX706ATEPA+ 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 MAX706ATEPA+ meets industry standards.
7.What is the process for return or replacement of MAX706ATEPA+?
All MAX706ATEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ATEPA+, 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 MAX706ATEPA+ part is unused and in its original packaging.
Return procedure for MAX706ATEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX706ATEPA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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