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Analog Devices Inc./Maxim Integrated MAX706ASESA+
- Part No.:
- MAX706ASESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706ASESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:570
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Product details
Overview
MAX706ASESA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing power-on reset, watchdog timeout (1.6s), 2.93V supply-voltage monitoring, and a 1.25V power-fail comparator input. It operates over –40°C to +85°C in an 8-pin SO package and is used in battery-powered instruments and embedded controllers requiring reliable power sequencing.
For engineers reviewing the MAX706ASESA+ datasheet, MAX706ASESA+ pinout, MAX706ASESA+ application, or MAX706ASESA+ equivalent, key selection criteria include reset threshold accuracy (2.93V ±1.5%), guaranteed RESET assertion down to VCC = 1V, manual reset debounce, low quiescent current (100µA), and compatibility with TTL/CMOS logic interfaces.
Technical Context
The MAX706ASESA+ implements a precision bandgap-based voltage monitor with 20mV hysteresis and a dedicated 1.25V reference for PFI comparison. Its internal reset generator guarantees a 200ms active-low RESET pulse after VCC exceeds the 2.93V threshold or MR deassertion.
The watchdog timer resets on any WDI edge and times out after 1.6s if no transition occurs; it remains enabled at all times (unlike AP-series variants) and asserts WDO low during timeout or brownout. The MR input features internal 70µA pull-up and accepts TTL/CMOS-compatible pulses as short as 150ns at VCC = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely monitors +3.3V supplies during brownout and ensures µP reset before logic corruption. |
| Reset Pulse Width | 200ms typical - provides sufficient time for µP initialization and peripheral stabilization after power-up. |
| Watchdog Timeout | 1.6s - detects firmware hangs in real-time embedded applications without requiring external timing components. |
| Supply Current | 100µA max - enables long battery life in portable instrumentation and low-power IoT edge nodes. |
| PFI Threshold | 1.25V ±40mV - supports configurable power-fail warning via external resistor divider for unregulated rail monitoring. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood auxiliary control modules. |
| VCC Range | 3.0V to 5.5V - interoperable with both +3.3V logic and legacy +5V µP systems without level-shifting. |
Pinout & Package
MAX706ASESA+ 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; debounces pushbutton switches with ≥200ms effective hold time. |
| 2 VCC | Positive supply input | Accepts 3.0V–5.5V; requires 0.1µF bypass capacitor to GND for noise immunity in noisy environments. |
| 3 GND | Ground reference | Common return path for all internal circuits and output drivers; must be low-impedance for stable reset timing. |
| 4 PFI | Power-fail comparator input | High-impedance node (±25nA leakage); compares against internal 1.25V reference to trigger PFO on undervoltage. |
| 5 PFO | Active-low power-fail output | Open-drain output sinking up to 3.2mA; signals early power degradation before main supply collapse. |
| 6 WDI | Watchdog input | Edge-sensitive; toggling within 1.6s prevents WDO assertion; no disable capability in this variant. |
| 7 RESET | Active-low reset output | Guaranteed low when VCC < 2.93V or MR low; remains asserted for 200ms after recovery; drives µP reset pin directly. |
| 8 WDO | Active-low watchdog output | Asserts on timeout or VCC brownout; can be connected to µP NMI or MR to force system-level recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing µP latch-up or undefined state entry. |
| Debounced manual reset input | Eliminates need for external RC filtering; supports direct connection to mechanical switches in handheld devices. |
| 1.25V precision PFI reference | Enables accurate power-fail detection across varying temperature and supply conditions without trimming. |
| 200ms factory-trimmed reset delay | Removes dependency on external timing capacitors, reducing BOM count and improving production yield. |
| Watchdog timer with 1.6s timeout | Provides fail-safe recovery for firmware lockups in safety-critical embedded controllers without software overhead. |
Applications
| Battery-Powered Instruments | Industrial Controllers |
|---|---|
Use Scenario: Portable multimeter powered by dual AA cells with automatic shutdown on low battery. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and uses PFI to detect battery sag below 2.93V; triggers orderly shutdown via PFO → MR path. Use Value: Prevents data corruption during write-to-flash operations by asserting RESET before supply drops below µP operational minimum. |
Use Scenario: PLC I/O module operating in factory-floor environment with fluctuating 24V DC input. IC Role / Device Role / Timing Role: MAX706ASESA+ monitors local 3.3V LDO output and asserts RESET on brownout; WDO tied to MR for watchdog-triggered recovery. Use Value: Maintains deterministic boot sequence despite input ripple, eliminating spurious restarts caused by transient dips. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Single-board computer using +3.3V core supply with optional +5V USB peripheral interface. IC Role / Device Role / Timing Role: Provides unified reset generation for ARM Cortex-M host and companion peripherals; RESET output drives all reset pins synchronously. Use Value: Ensures simultaneous release of all subsystems after power stabilization, avoiding race conditions in multi-chip boot sequences. |
Use Scenario: Medical diagnostic device requiring fail-safe power monitoring per IEC 62304 Class C requirements. IC Role / Device Role / Timing Role: Monitors 3.3V supply with 2.93V threshold and feeds WDO into safety MCU's NMI pin for independent fault escalation. Use Value: Delivers hardware-enforced watchdog response independent of main application firmware, satisfying redundancy mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA+ | Identical pinout, package, and electrical specs; differs only in lead-free finish (MAX706ASESA+ is lead-free, MAX706SESA+ is legacy SnPb). | No functional difference; MAX706SESA+ may be restricted in RoHS-compliant designs. | Select MAX706ASESA+ for new designs requiring lead-free compliance and full lifecycle support. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (±0.5%), 350ms reset delay, no watchdog or PFI; 5-pin SOT-23 package. | Lacks watchdog and power-fail comparator; suitable only for basic reset-only applications without supervision features. | Choose only if watchdog and PFI functions are unnecessary and board space is constrained. |
Compared with MAX706SESA+, MAX706ASESA+ offers identical functionality with modern lead-free processing and extended manufacturer support; versus TPS3808G33DBVR, it delivers integrated watchdog and power-fail monitoring in the same SO-8 footprint-enabling feature-rich supervision without adding discrete components.
Availability
MAX706ASESA+ is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controllers, embedded computers, and critical µP power monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706ASESA+ 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 MAX706 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing robust power-supply supervision with minimal external components and guaranteed timing behavior.
FAQ
What is the reset threshold voltage of the MAX706ASESA+?
The MAX706ASESA+ has a factory-trimmed reset threshold of 2.93V ±1.5%, optimized for monitoring +3.3V power rails. This value is specified over the full –40°C to +85°C operating temperature range and ensures reliable reset assertion during brownout conditions before µP logic becomes unstable. The MAX706ASESA+ does not support adjustable thresholds.
Does the MAX706ASESA+ include a watchdog timer function?
Yes, the MAX706ASESA+ includes a watchdog timer with a nominal 1.6s timeout period. It monitors the WDI pin for edges and asserts the WDO output low if no transition occurs within that window. Unlike AP-series variants, the watchdog cannot be disabled-the MAX706ASESA+ watchdog remains permanently enabled.
Can the MAX706ASESA+ monitor a secondary power supply such as +12V?
Yes, the MAX706ASESA+ can monitor higher voltages like +12V using its PFI input with an external resistive divider. The internal 1.25V reference allows setting custom trip points-for example, a 10.24V to 11.50V range for +12V monitoring. The PFO output then signals undervoltage condition independently of the main VCC reset function.
What is the minimum pulse width required on the MR pin for reliable reset activation?
The MAX706ASESA+ requires a minimum MR pulse width of 150ns at VCC = 5V and 500ns at VCC = 3.0V. The internal 70µA pull-up ensures clean signal restoration, and the input is TTL/CMOS-compatible-allowing direct connection to microcontroller GPIO or mechanical switches without external conditioning.
Is the MAX706ASESA+ pin-compatible with other members of the MAX706 family?
Yes, the MAX706ASESA+ shares identical pinout and package (8-pin SO, S8-2) with all MAX706R/S/T and MAX706AR/AS/AT variants. Differences are limited to reset threshold voltage (2.93V for 'S'), temperature grade (–40°C to +85°C), and lead-free compliance-ensuring drop-in replacement within the same suffix group.
MAX706ASESA+ 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:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706ASESA+ FAQ
1.How can I place an order for MAX706ASESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706ASESA+ 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 MAX706ASESA+ reliable?
The price and inventory of MAX706ASESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706ASESA+ is usually 5 days.
3.What payment methods are accepted for MAX706ASESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706ASESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706ASESA+?
MAX706ASESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706ASESA+ 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 MAX706ASESA+?
For technical support, including MAX706ASESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706ASESA+ requirements.
6.How does Aetrix verify that MAX706ASESA+ is sourced from the original manufacturer or authorized distributors?
All MAX706ASESA+ 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 MAX706ASESA+ meets industry standards.
7.What is the process for return or replacement of MAX706ASESA+?
All MAX706ASESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706ASESA+, 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 MAX706ASESA+ part is unused and in its original packaging.
Return procedure for MAX706ASESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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