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Analog Devices Inc./Maxim Integrated MAX706SCUA+T
- Part No.:
- MAX706SCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706SCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,639
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Product details
Overview
MAX706SCUA+T from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V systems, providing reset generation (200ms delay), watchdog timeout (1.6s), 1.25V power-fail comparator input, and debounced manual-reset input. 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 MAX706SCUA+T datasheet, MAX706SCUA+T pinout, MAX706SCUA+T application, or MAX706SCUA+T equivalent, this page delivers verified electrical specs, package mapping to 8-pin µMAX (U8-1), functional role in power-monitoring subsystems, and validated alternative parts with documented threshold and watchdog differences.
Technical Context
The MAX706SCUA+T implements a precision voltage monitor with 2.93V reset threshold (±1.5% over temperature), integrated 1.6s watchdog timer with WDI edge detection, and independent 1.25V reference-based PFI comparator for power-fail warning. Its internal 70µA MR pull-up enables direct pushbutton interfacing without external components.
RESET assertion is guaranteed for VCC ≥ 1V; the output remains active-low for 200ms after VCC rises above threshold or MR release. The device operates across 3.0V–5.5V supply range with 100µA quiescent current and supports TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely monitors +3.3V supply rails during brownout; triggers reset before µP instability |
| Reset Pulse Width | 200ms typical - ensures sufficient hold time for full µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±40% - provides deterministic software liveliness check without requiring external timing components |
| Supply Current | 100µA max at +25°C - enables multi-year operation in coin-cell–powered portable instruments |
| PFI Threshold | 1.25V ±40mV - allows flexible power-fail or low-battery detection via external resistor divider |
| Operating Voltage | 3.0V to 5.5V - supports dual-supply systems (e.g., +3.3V µP with +5V peripherals or wall adapter) |
| MR Input Compatibility | TTL/CMOS - accepts direct connection to µP GPIO or mechanical switch without level-shifting |
Pinout & Package
MAX706SCUA+T is housed in an 8-pin µMAX® package (U8-1), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and lead-free finish compliant with RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-Low Manual Reset Input | Internally pulled up with 70µA; <0.6V assertion triggers 200ms RESET pulse; debounced by timing |
| 2 (VCC) | Positive Supply Input | Accepts 3.0V–5.5V; powers all internal circuits including reset generator and watchdog timer |
| 3 (GND) | Ground Reference | Common return path for reset, watchdog, and comparator circuits; must be low-impedance |
| 4 (PFI) | Power-Fail Comparator Input | High-impedance node referenced to 1.25V internal bandgap; connects to resistive divider for custom trip point |
| 5 (PFO) | Active-Low Power-Fail Output | Sinks current when PFI < 1.25V; used to interrupt µP or trigger orderly shutdown sequence |
| 6 (WDI) | Watchdog Input | Edge-sensitive; requires rising/falling transition every ≤1.6s to prevent WDO assertion |
| 7 (RESET) | Active-Low Reset Output | Drives µP reset pin low for 200ms after power-up, brownout recovery, or MR activation |
| 8 (WDO) | Active-Low Watchdog Output | Asserts independently of RESET when WDI stalls; can be wired to MR to generate secondary reset |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout - critical for nonvolatile memory write integrity |
| WDI Disable on High-Z | Watchdog automatically disables when WDI floats or connects to tri-state µP output (<600nA leakage), eliminating spurious timeouts |
| 200ms Reset Time Delay | Fixed internal timer eliminates need for external RC network - reduces BOM count and layout area |
| 1.25V Precision PFI Reference | Enables accurate low-battery detection or unregulated supply monitoring without external voltage reference IC |
| 100µA Quiescent Current | Minimizes standby power draw in always-on battery applications - extends shelf life and operational runtime |
Applications
| Battery-Powered Portable Instruments | Industrial Controller Power Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter powered by two AA cells, operating across 3.2V (fresh) to 2.4V (depleted). IC Role / Device Role / Timing Role: MAX706SCUA+T monitors VCC and asserts RESET before µP enters undefined state during battery sag; PFI detects <2.8V via divider to initiate data save. Use Value: Prevents corrupted EEPROM writes and display glitches during low-voltage operation - improves field reliability and user trust. |
Use Scenario: PLC I/O module with +3.3V µP core and isolated +24V field-side supplies. IC Role / Device Role / Timing Role: MAX706SCUA+T supervises +3.3V rail; PFO connected to µP NMI to flag early power-fail on +24V side via optocoupler feedback. Use Value: Enables 500ms pre-shutdown sequence for safe I/O state capture and fault logging - meets IEC 61000-4-29 immunity requirements. |
| Embedded Computer BIOS Initialization | Smart Sensor Node Power Management |
|
Use Scenario: Compact fanless PC using +3.3V supply derived from ATX +5V rail with transient load steps. IC Role / Device Role / Timing Role: MAX706SCUA+T generates clean 200ms RESET pulse synchronized to VCC ramp; WDI toggled by BIOS timer ISR every 800ms. Use Value: Eliminates boot hangs caused by marginal power sequencing - achieves >99.99% cold-start success rate in production test. |
Use Scenario: Wireless environmental sensor node powered by Li-SOCl₂ battery with 10-year target lifetime. IC Role / Device Role / Timing Role: MAX706SCUA+T supervises +3.3V LDO output; MR tied to wake-up GPIO; PFO monitors battery voltage decay via high-R divider. Use Value: Reduces average system current to 1.2µA in sleep mode while retaining full brownout protection - directly extends battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SEUA+ | Same 2.93V reset threshold and µMAX package, but rated for -40°C to +85°C industrial temp range | Required for outdoor or automotive-adjacent deployments where ambient exceeds +70°C | Select MAX706SEUA+ when extended temperature operation is mandatory; otherwise MAX706SCUA+T suffices for commercial environments. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms delay, no watchdog, 3.5µA IQ, SOT-23-6 package | Lacks watchdog and PFI/PFO functions; suited only for basic reset supervision without power-fail signaling | Choose TPS3808G33DBVR only if watchdog and power-fail comparator are unnecessary and ultra-low IQ is prioritized over feature set. |
Compared with MAX706SEUA+, MAX706SCUA+T offers identical functionality at lower cost for 0°C to +70°C use cases; versus TPS3808G33DBVR, it delivers integrated watchdog and power-fail detection in the same footprint - enabling feature-rich supervision without adding discrete comparators or timers.
Availability
MAX706SCUA+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controller power monitoring, and embedded computer BIOS initialization requiring stable component supply across commercial temperature ranges.
Supply support for MAX706SCUA+T 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 power, sensing, and interface applications, with emphasis on high-reliability industrial and computing solutions.
The MAX706 family targets cost-sensitive, space-constrained µP systems needing integrated reset, watchdog, and power-fail monitoring - specifically optimized for +3V/+3.3V embedded platforms where board area and BOM count are critical.
FAQ
What is the exact reset threshold voltage for MAX706SCUA+T?
The MAX706SCUA+T has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±1.5% over the 0°C to +70°C operating temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold (VCC Falling)" for MAX70_S and MAX706AS variants. The threshold ensures reliable reset assertion before +3.3V µP supply droop causes logic errors.
Does MAX706SCUA+T include a watchdog timer, and what is its timeout period?
Yes, MAX706SCUA+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge (rising or falling) at the WDI pin and asserts the WDO output low if no transition occurs within that window. The timeout has ±40% variation over temperature and supply voltage, as specified in the Electrical Characteristics table under "Watchdog Timeout Period".
Can MAX706SCUA+T monitor a power supply other than VCC using the PFI pin?
Yes, the PFI pin on MAX706SCUA+T is a high-impedance input referenced to an internal 1.25V bandgap. By connecting PFI to a resistive divider from any DC voltage rail (e.g., +12V, +5V, or battery), the device can assert PFO when that rail falls below a user-defined threshold. The PFI input draws only ±25nA, minimizing divider loading error.
What package type and dimensions does MAX706SCUA+T use?
MAX706SCUA+T uses the 8-pin µMAX® package (package code U8-1), measuring 3.0mm × 3.0mm × 0.8mm with an exposed thermal pad. It is RoHS-compliant and lead-free. Pinout matches standard SO-8 but in a 40% smaller footprint - confirmed in the "Pin Configurations" section and "Ordering Information" table of the datasheet.
Is the RESET output of MAX706SCUA+T active-high or active-low?
The RESET output of MAX706SCUA+T is active-low, as indicated by the "R" suffix in the part number (MAX706R series). It remains low when VCC is below 2.93V or when MR is asserted, and deasserts high 200ms after VCC rises above threshold or MR is released. This matches the functional description for MAX706R/S/T devices in the General Description section.
MAX706SCUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX706SCUA+T FAQ
1.How can I place an order for MAX706SCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706SCUA+T 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 MAX706SCUA+T reliable?
The price and inventory of MAX706SCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706SCUA+T is usually 5 days.
3.What payment methods are accepted for MAX706SCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706SCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706SCUA+T?
MAX706SCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706SCUA+T 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 MAX706SCUA+T?
For technical support, including MAX706SCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706SCUA+T requirements.
6.How does Aetrix verify that MAX706SCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX706SCUA+T 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 MAX706SCUA+T meets industry standards.
7.What is the process for return or replacement of MAX706SCUA+T?
All MAX706SCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706SCUA+T, 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 MAX706SCUA+T part is unused and in its original packaging.
Return procedure for MAX706SCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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