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Analog Devices Inc./Maxim Integrated MAX706SEUA+
- Part No.:
- MAX706SEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706SEUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,596
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Product details
Overview
MAX706SEUA+ from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (200ms delay), watchdog timer (1.6s timeout), 1.25V power-fail comparator input, and manual-reset input for +3V/+3.3V systems. It asserts RESET when VCC falls below 2.93V or MR is pulled low, and guarantees RESET assertion down to VCC = 1V - used in portable instruments and battery-powered controllers requiring reliable brownout protection.
For engineers reviewing the MAX706SEUA+ datasheet, MAX706SEUA+ pinout, MAX706SEUA+ application, or MAX706SEUA+ equivalent, key selection criteria include its 2.93V reset threshold, active-low RESET output, 100µA quiescent current, watchdog disable capability via high-impedance WDI, and guaranteed operation over –40°C to +85°C.
Technical Context
The MAX706SEUA+ integrates a precision voltage monitor with 20mV hysteresis, a monostable reset generator with fixed 200ms pulse width, and a watchdog timer that resets on any WDI edge within 1.6s. Its PFI input connects to an internal 1.25V reference for flexible power-fail or low-battery detection independent of VCC.
RESET is asserted during power-up until VCC exceeds 2.93V, remains asserted for 200ms after VCC stabilizes, and reasserts immediately upon brownout. The WDO output goes low on watchdog timeout or VCC undervoltage, but deasserts as soon as VCC rises above threshold - unlike RESET, which maintains 200ms hold time.
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 typical; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; balances fault detection responsiveness with software servicing margin |
| Quiescent Current | 100µA max at VCC = 3.3V; enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±0.05V; supports accurate power-fail warning or secondary supply monitoring via external resistor divider |
| Operating Temperature | –40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
| VCC Range | 3.0V to 5.5V; compatible with both +3.3V logic and legacy +5V µP systems |
Pinout & Package
MAX706SEUA+ is housed in an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, surface-mount, lead-free compliant. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; 500ns minimum pulse width at 3V |
| 2 (VCC) | Positive supply input | Accepts 3.0V–5.5V; bypassing with 0.1µF capacitor to GND recommended for noise immunity |
| 3 (GND) | Ground reference | System ground return; must be low-impedance for stable reset timing and comparator accuracy |
| 4 (PFI) | Power-fail comparator input | Connects to resistive divider; triggers PFO when voltage falls below internal 1.25V reference |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive MR or µP interrupt line directly |
| 6 (WDI) | Watchdog input | Edge-sensitive; toggling required every 1.6s; disables automatically if left open or connected to high-Z tri-state output |
| 7 (RESET) | Active-low reset output | Asserted when VCC < 2.93V or MR low; guaranteed low down to VCC = 1V; 200ms deassertion delay |
| 8 (WDO) | Active-low watchdog output | Goes low on WDI timeout or VCC undervoltage; deasserts immediately when VCC recovers above threshold |
Key Features
| Feature | Design Value |
|---|---|
| 2.93V precision reset threshold | Matches common +3.3V µP supply tolerance; eliminates need for external resistor network |
| Watchdog disable on high-Z WDI | Enables safe watchdog suspension during debug or low-power sleep without hardware modification |
| 1.25V PFI reference with 10mV hysteresis | Prevents chatter during slow-voltage transitions; supports robust early-warning power-fail detection |
| Guaranteed RESET assertion to VCC = 1V | Ensures µP remains held in reset through full power-down, preventing undefined state execution |
| 200ms reset pulse width | Meets JEDEC JESD8-12B requirements for most 8/16-bit µPs and microcontrollers |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA batteries, operating across 3.0V–3.6V range with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC monitors main supply and triggers controlled shutdown when battery voltage drops below 2.93V; PFI detects unregulated rail collapse before regulator dropout. Use Value: Prevents data corruption during low-battery operation and enables graceful save-and-shutdown sequence via PFO-triggered µP interrupt. |
Use Scenario: PLC I/O module subjected to intermittent 24V DC supply dips in factory environments. IC Role / Device Role / Timing Role: Resets controller µP on 3.3V rail brownout (2.93V threshold) and uses WDO to detect firmware lockup during communication faults. Use Value: Eliminates need for external RC reset circuits and provides dual-fault coverage - supply instability and software hang - with single IC. |
| Embedded Computing in Ruggedized Devices | Low-Power Sensor Node Gateways |
Use Scenario: Fanless edge gateway operating in automotive under-hood temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Provides cold-start reset assurance and monitors 3.3V core rail; WDI tied to heartbeat timer output. Use Value: Ensures deterministic boot behavior after thermal cycling and recovers autonomously from transient MCU hangs without host intervention. |
Use Scenario: Wireless environmental sensor node powered by coin cell, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Holds µC in reset until stable 3.3V from boost converter; PFI monitors battery voltage via divider to trigger low-battery alert before cutoff. Use Value: Extends usable battery life by enabling precise end-of-life detection and eliminating false resets caused by load-switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706REUA+ | 2.63V reset threshold; otherwise identical pinout, features, and µMAX package | Better suited for +3.0V systems or tighter supply tolerances where earlier reset assertion is required | Select MAX706REUA+ when system VCC nominal is 3.0V and brownout margin must exceed 370mV |
| MAX706TEUA+ | 3.08V reset threshold; same package and functional set | Optimized for +3.3V systems with higher noise immunity or wider supply regulation tolerance | Choose MAX706TEUA+ when VCC regulation is tight (±2%) and reset must avoid nuisance triggering near upper rail limit |
Compared with MAX706REUA+ and MAX706TEUA+, the MAX706SEUA+ offers the median 2.93V threshold - ideal for general-purpose +3.3V designs where supply variation spans 3.0V–3.6V, balancing early fault detection against noise-induced false resets.
Availability
MAX706SEUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controllers, ruggedized embedded computing, and low-power sensor gateways requiring stable component supply across extended temperature ranges.
Supply support for MAX706SEUA+ 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 analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX706 family was designed specifically for cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - targeting portable, battery-operated, and industrial control equipment.
FAQ
What is the reset threshold voltage of the MAX706SEUA+?
The MAX706SEUA+ has a precision reset threshold of 2.93V (typical) with ±70mV tolerance over temperature and supply. This value applies when VCC is falling, and the device guarantees RESET assertion until VCC rises above this level plus 20mV hysteresis. The threshold is factory-trimmed and does not require external components - it is fixed for the 'S' variant in the MAX706 family.
Does the MAX706SEUA+ include a watchdog timer, and how is it enabled or disabled?
Yes, the MAX706SEUA+ includes a 1.6s watchdog timer monitored via the WDI pin. It is enabled by default and resets on any rising or falling edge at WDI. The watchdog function disables automatically when WDI is left open or connected to a high-impedance tri-state output with leakage <600nA - no external control signal is needed. This behavior is inherent to the MAX706SEUA+ design and requires no configuration.
Can the MAX706SEUA+ monitor a secondary voltage like a battery or unregulated rail?
Yes, the MAX706SEUA+ supports secondary voltage monitoring using its PFI (Power-Fail Input) pin and internal 1.25V comparator reference. By connecting PFI to a resistive divider from the target rail, the device asserts PFO when that rail falls below the threshold derived from the divider ratio. This enables low-battery detection, unregulated supply monitoring, or custom reset triggering independent of VCC.
What is the operating temperature range for the MAX706SEUA+?
The MAX706SEUA+ is rated for operation from –40°C to +85°C, indicated by the 'E' suffix in its ordering code. This extended temperature grade is validated per Maxim's production test flow and supports industrial and automotive-adjacent applications where ambient conditions exceed commercial range limits. All electrical specifications in the datasheet apply across this full range.
Is the MAX706SEUA+ pin-compatible with other MAX706 variants in the µMAX package?
Yes, all MAX706 variants - including MAX706PEUA+, MAX706REUA+, MAX706SEUA+, MAX706TEUA+, and their 'A' series counterparts - share identical 8-pin µMAX (U8-1) pinouts and footprints. Differences are limited to reset threshold voltage, RESET polarity (active-high vs. active-low), and watchdog enable/disable behavior - no PCB layout change is required when substituting within the same package type.
MAX706SEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-uMAX/uSOP
MAX706SEUA+ FAQ
1.How can I place an order for MAX706SEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706SEUA+ 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 MAX706SEUA+ reliable?
The price and inventory of MAX706SEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706SEUA+ is usually 5 days.
3.What payment methods are accepted for MAX706SEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706SEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706SEUA+?
MAX706SEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706SEUA+ 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 MAX706SEUA+?
For technical support, including MAX706SEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706SEUA+ requirements.
6.How does Aetrix verify that MAX706SEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706SEUA+ 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 MAX706SEUA+ meets industry standards.
7.What is the process for return or replacement of MAX706SEUA+?
All MAX706SEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706SEUA+, 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 MAX706SEUA+ part is unused and in its original packaging.
Return procedure for MAX706SEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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