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Analog Devices Inc./Maxim Integrated MAX706APESA+
- Part No.:
- MAX706APESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706APESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,886
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Product details
Overview
MAX706APESA+ from Maxim Integrated is an active-high reset, watchdog-enabled microprocessor supervisory circuit for +3V/+3.3V systems. It provides power-on reset, 1.6s watchdog timeout, 2.63V reset threshold, 1.25V power-fail comparator input, and debounced manual reset - used in battery-powered portable instruments to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX706APESA+ datasheet, MAX706APESA+ pinout, MAX706APESA+ application, or MAX706APESA+ equivalent, key selection criteria include active-high RESET output compatibility, WDI disable capability during tri-state operation, guaranteed reset assertion down to VCC = 1V, and SO-8 package suitability for space-constrained embedded designs.
Technical Context
The MAX706APESA+ integrates a precision voltage monitor with 2.63V ±1.5% threshold, a 1.6s watchdog timer that disables when WDI is open or high-impedance (leakage <600nA), and a 1.25V reference-based power-fail comparator. Its reset generator asserts active-high RESET for ≥200ms after VCC exceeds threshold or MR release.
It operates across VCC = 2.7V–5.5V with 100µA quiescent current, supports TTL/CMOS-compatible MR input (min pulse width 150ns at 5V), and guarantees RESET assertion down to VCC = 1V - enabling robust low-voltage supervision in portable +3V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely triggers reset during +3V supply brownout before µP instability occurs |
| Reset Output Polarity | Active-high - directly interfaces with µP reset inputs requiring high-valid assertion without inversion logic |
| Watchdog Timeout | 1.6s ±40% - provides sufficient window for firmware servicing while detecting lockup in real-time embedded code |
| Power-Fail Comparator | 1.25V internal reference - enables external resistive divider for customizable early-warning detection of unregulated rail collapse |
| Quiescent Current | 100µA max - minimizes battery drain in always-on portable instrumentation and handheld controllers |
| Reset Pulse Width | 200ms min - ensures µP completes full initialization and peripheral configuration before release |
| Operating Voltage Range | 2.7V to 5.5V - supports dual-supply operation from Li-ion battery (3.0–3.6V) or wall adapter (5V) |
Pinout & Package
MAX706APESA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard reflow profiles and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA source; 150ns minimum pulse width at 5V |
| 2 VCC | Positive supply input | Accepts 2.7V–5.5V; bypassing with 0.1µF capacitor to GND required for noise immunity |
| 3 GND | Ground reference | Common return for all internal circuits and output sinks; must be low-impedance connection |
| 4 PFI | Power-fail comparator input | Connects to resistive divider; asserts PFO when voltage falls below 1.25V reference |
| 5 PFO | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V - used for µP interrupt or secondary reset initiation |
| 6 WDI | Watchdog input | Rising/falling edge resets 1.6s timer; disables automatically if left open or connected to high-Z tri-state output |
| 7 RESET | Active-high reset output | Puhs-pull output; remains high during VCC < 2.63V or MR low; deasserts 200ms after valid VCC/MR release |
| 8 WDO | Active-low watchdog output | Open-drain; goes low on watchdog timeout or VCC drop; recovers immediately when VCC rises above threshold |
Key Features
| Feature | Design Value |
|---|---|
| WDI Disable Function | Automatically disables watchdog when WDI is open-circuited or driven by high-impedance tri-state output (<600nA leakage), eliminating spurious timeouts during firmware sleep modes |
| Guaranteed Reset at Low VCC | RESET asserted reliably down to VCC = 1V - ensures deterministic behavior during deep brownout or battery depletion |
| Debounced Manual Reset | 140ms minimum internal reset pulse width eliminates mechanical switch bounce without external RC network |
| Low-Power Operation | 100µA supply current enables multi-year battery life in always-on monitoring applications such as portable data loggers |
| Supply-Voltage Hysteresis | 20mV reset threshold hysteresis prevents oscillation during slow VCC ramp-up or noisy supply conditions |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell (3.0–4.2V range) operating across temperature and aging-induced voltage sag. IC Role / Device Role / Timing Role: Supervisory IC providing active-high reset, 200ms power-on delay, and 1.6s watchdog to prevent firmware hang during measurement cycles. Use Value: Ensures µP only executes calibrated routines after stable supply is confirmed, avoiding corrupted ADC readings or display glitches during low-battery operation. |
Use Scenario: PLC I/O module exposed to fluctuating 24VDC field supplies with transient dips due to motor switching or cable inductance. IC Role / Device Role / Timing Role: Monitors local +3.3V regulator output; asserts RESET on brownout and triggers PFO-driven NMI for graceful I/O state preservation. Use Value: Prevents spurious relay actuation or sensor misreads by holding µP in reset until regulated rail recovers - critical for functional safety compliance. |
| Computers with Dual-Supply Flexibility | Intelligent Sensors with Power-Fail Warning |
Use Scenario: Embedded computer board supporting both battery (3.3V) and wall adapter (5V) operation, requiring identical reset timing regardless of supply source. IC Role / Device Role / Timing Role: Single-supply supervisory IC with wide VCC range (2.7–5.5V) and fixed 200ms reset pulse - eliminates need for separate reset circuits per rail. Use Value: Reduces BOM count and layout area while guaranteeing consistent boot behavior across power sources, simplifying certification testing. |
Use Scenario: Smart environmental sensor node using unregulated DC-DC converter output to detect impending power loss before battery exhaustion. IC Role / Device Role / Timing Role: Uses PFI/PFO comparator pair to generate early warning interrupt when unregulated input drops below user-defined threshold (e.g., 9.5V). Use Value: Enables firmware to save calibration data, transmit final reading, and enter ultra-low-power hibernation - extending usable battery life by >15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | Active-low RESET output; same 2.63V threshold, 1.6s watchdog, SO-8 package | Requires external inverter or µP with active-low reset input; no change to PCB layout | Select when system design mandates active-low reset assertion and inverter logic is already present |
| TPS3808G12DBVR | 2.93V reset threshold, 200ms delay, no watchdog, SOT-23-6 package, 1.4µA quiescent current | Lacks watchdog and PFI/PFO functions; smaller footprint but requires external components for equivalent functionality | Select for ultra-low-power applications where watchdog is unnecessary and board space is severely constrained |
Compared with MAX706RCSA+, MAX706APESA+ eliminates need for external level-shifting logic; compared with TPS3808G12DBVR, it delivers integrated watchdog and power-fail warning in one SO-8 device - reducing total component count and validation effort for full-featured supervision.
Availability
MAX706APESA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for MAX706APESA+ 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 applications, emphasizing reliability, integration, and low-power operation.
MAX706APESA+ belongs to the MAX706 family of microprocessor supervisory circuits, engineered specifically for robust +3V system monitoring with integrated reset, watchdog, and power-fail detection in compact packages.
FAQ
What is the reset output polarity of the MAX706APESA+?
The MAX706APESA+ features an active-high RESET output (pin 7). Unlike the MAX706R/S/T variants, it asserts RESET as a logic-high signal during power-up, brownout, or manual reset - directly compatible with µPs requiring high-valid reset assertion without external inversion. This behavior is fixed and cannot be configured via pins or registers.
Does the MAX706APESA+ watchdog timer require external components to operate?
No, the MAX706APESA+ watchdog timer operates autonomously with a nominal 1.6s timeout period and requires no external capacitors or resistors. The watchdog input (WDI, pin 6) accepts standard logic edges; the timer disables automatically when WDI is left open or connected to a high-impedance tri-state output with leakage <600nA - eliminating external pull-up requirements in many microcontroller interfaces.
Can the MAX706APESA+ monitor a power supply other than VCC?
Yes, the MAX706APESA+ includes a dedicated power-fail comparator with PFI (pin 4) and PFO (pin 5). By connecting PFI to a resistive divider from an unregulated or auxiliary rail (e.g., +12V or -5V), the device generates an active-low PFO interrupt when that rail falls below the internal 1.25V reference - enabling early-warning detection independent of VCC monitoring.
What is the minimum VCC voltage at which MAX706APESA+ guarantees RESET assertion?
The MAX706APESA+ guarantees RESET remains asserted (logic-high) down to VCC = 1.0V at 0°C to +70°C ambient, and down to VCC = 1.2V over the full -40°C to +85°C industrial temperature range. This ensures deterministic reset hold during deep brownout or battery discharge, preventing µP execution in undefined states.
Is the MAX706APESA+ pin-compatible with other MAX706 variants in SO-8 package?
Yes, the MAX706APESA+ shares identical SO-8 (S8-2) pinout with all MAX706x and MAX708x variants in the same package, including MAX706RCSA+, MAX706SCSA+, and MAX708RCSA+. Pin functions (MR, VCC, GND, PFI, PFO, WDI, RESET, WDO) are consistent across the family - enabling direct substitution where functional requirements align.
MAX706APESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706APESA+ FAQ
1.How can I place an order for MAX706APESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706APESA+ 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 MAX706APESA+ reliable?
The price and inventory of MAX706APESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706APESA+ is usually 5 days.
3.What payment methods are accepted for MAX706APESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706APESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706APESA+?
MAX706APESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706APESA+ 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 MAX706APESA+?
For technical support, including MAX706APESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706APESA+ requirements.
6.How does Aetrix verify that MAX706APESA+ is sourced from the original manufacturer or authorized distributors?
All MAX706APESA+ 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 MAX706APESA+ meets industry standards.
7.What is the process for return or replacement of MAX706APESA+?
All MAX706APESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706APESA+, 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 MAX706APESA+ part is unused and in its original packaging.
Return procedure for MAX706APESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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