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Analog Devices Inc./Maxim Integrated MAX706PEUA+
- Part No.:
- MAX706PEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706PEUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:5,466
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Product details
Overview
MAX706PEUA+ from Maxim Integrated is an active-high reset, +3V microprocessor supervisory circuit in an 8-pin µMAX package. It provides power-on/power-down/brownout reset (200ms delay), 1.6s watchdog timer, 1.25V power-fail comparator input (PFI), and debounced manual-reset input (MR). It operates from 2.7V to 5.5V and guarantees RESET assertion down to VCC = 1V - used in battery-powered portable instruments and industrial controllers requiring reliable startup sequencing.
For engineers reviewing the MAX706PEUA+ datasheet, MAX706PEUA+ pinout, MAX706PEUA+ application, or MAX706PEUA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset threshold (2.63V), watchdog timeout (1.6s), and validated alternatives for +3V µP monitoring designs.
Technical Context
The MAX706PEUA+ integrates a precision voltage monitor with 20mV hysteresis, a monostable reset generator with fixed 200ms pulse width, and a watchdog timer that resets on WDI edge transitions. Its internal 70µA MR pull-up enables direct pushbutton interfacing without external components.
It features a dedicated 1.25V reference for the PFI comparator, allowing flexible power-fail or low-battery detection independent of VCC. The active-high RESET output asserts when VCC falls below 2.63V or MR is pulled low, and deasserts only after VCC exceeds threshold and the 200ms timer expires.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset initiation before µP supply dropout in +3V systems |
| Reset Pulse Width | 200ms typical; meets minimum µP reset hold-time requirements across temperature |
| Watchdog Timeout | 1.6s ±0.65s; provides deterministic firmware supervision window without external timing components |
| Supply Current | 100µA max at -40°C to +85°C; enables multi-year operation in battery-backed applications |
| PFI Threshold | 1.25V ±0.05V; supports accurate power-fail warning via external resistive divider |
| Operating Voltage | 2.7V to 5.5V; compatible with both +3.3V and +5V µP rails without level-shifting |
| RESET Output Type | Active-high only; directly interfaces with µP reset inputs requiring high-asserted reset |
Pinout & Package
MAX706PEUA+ uses an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, surface-mount, lead-free compliant.
| 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 below 0.6V |
| 2 (VCC) | Positive supply input | Accepts 2.7V–5.5V; powers all internal circuits including reset generator and watchdog |
| 3 (GND) | Ground reference | Return path for all internal current sources and outputs; must be low-impedance for noise immunity |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to 1.25V; used with external resistor divider to set custom undervoltage warning threshold |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive µP interrupt or MR to initiate orderly shutdown |
| 6 (WDI) | Watchdog input | Edge-sensitive; requires transition within 1.6s to prevent WDO assertion; disables when left open (high-Z) |
| 7 (RESET) | Active-high reset output | Asserts high during power-up/brownout until VCC > 2.63V and 200ms elapses; drives µP reset pin directly |
| 8 (WDO) | Active-low watchdog output | Asserts low if WDI inactive for >1.6s; also asserts during VCC brownout but releases immediately upon VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures µP remains held in reset even during deep brownout or battery sag, preventing erratic execution |
| WDI disable on high-impedance state | Allows safe watchdog disable during µP sleep modes or tri-state I/O configurations without external logic |
| Debounced MR input | Eliminates need for external RC debounce circuitry; 500ns minimum pulse width at VCC = 3V suffices |
| 100nA PFI input leakage | Minimizes error in resistive-divider-based power-fail detection, enabling stable threshold setting |
| 20mV reset threshold hysteresis | Prevents oscillatory reset assertion near trip point under noisy or slowly varying supply conditions |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller Controllers |
|---|---|
|
Use Scenario: Handheld multimeter powered by two AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and low-battery warning via PFI monitoring cell voltage. Use Value: Guarantees clean µP initialization at startup and prevents data corruption during battery depletion; 100µA quiescent current extends battery life. |
Use Scenario: PLC I/O module operating from 3.3V rail derived from isolated DC-DC converter. IC Role / Device Role / Timing Role: System-level supervisor ensuring µP reset during input power interruption and detecting auxiliary supply faults. Use Value: 200ms reset pulse satisfies industrial µP hold-time specs; PFO output triggers diagnostic logging before shutdown. |
| Embedded Computing Systems | Critical µP Power Monitoring |
|
Use Scenario: Fanless embedded PC using +3.3V core supply and +5V peripheral rail. IC Role / Device Role / Timing Role: Primary reset generator for main µP, with WDI fed by periodic firmware heartbeat signal. Use Value: 1.6s watchdog timeout detects software lockup without false triggers from brief interrupts; active-high RESET matches common µP pinout. |
Use Scenario: Medical sensor node requiring fail-safe boot integrity and regulated/unregulated supply monitoring. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for µP reset and uses PFI to track unregulated battery input for early warning. Use Value: Independent 1.25V PFI reference enables precise low-battery detection; guaranteed RESET to 1V ensures safety-critical reset enforcement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706REUA+ | Active-low RESET output; identical 2.63V threshold, 200ms delay, and watchdog functionality | Requires µP with active-low reset input; no change to power-fail or watchdog circuitry | Select when target µP reset pin is active-low; same footprint and biasing, only RESET polarity differs |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; no PFI/PFO; no watchdog; 350ms reset delay; 2.5V–6.0V operation | Lacks power-fail warning and firmware supervision; suited for simpler reset-only use cases | Choose only if watchdog and PFI functions are unnecessary and 1.2V reset threshold aligns with system requirements |
Compared with MAX706REUA+, MAX706PEUA+ offers active-high reset compatibility without altering PCB layout; versus TPS3808G12DBVR, it delivers integrated watchdog and power-fail detection essential for robust embedded supervision - not just basic reset.
Availability
MAX706PEUA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX706PEUA+ 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 in industrial, medical, and communications systems.
The MAX706 family delivers cost-effective, integrated µP supervision - combining reset generation, watchdog timing, and power-fail detection in a single 8-pin package for space-constrained +3V systems.
FAQ
What is the reset threshold voltage for MAX706PEUA+?
The MAX706PEUA+ has a guaranteed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table. The device asserts its active-high RESET output whenever VCC drops below this threshold, and holds it asserted for 200ms after VCC rises above it. This threshold is fixed and cannot be adjusted externally.
Does MAX706PEUA+ include a watchdog timer, and how is it configured?
Yes, MAX706PEUA+ includes a 1.6s watchdog timer monitored via the WDI pin. A rising or falling edge on WDI resets the timer; failure to toggle WDI within 1.6s causes WDO to go low. Unlike the MAX706R/S/T variants, the MAX706PEUA+ (as part of the AP series) disables the watchdog automatically when WDI is left open or driven high-impedance, eliminating unintended timeouts during µP sleep states.
Can MAX706PEUA+ monitor a secondary voltage like a battery or unregulated rail?
Yes, MAX706PEUA+ supports secondary voltage monitoring via its PFI (Power-Fail Input) pin, which compares an external voltage against an internal 1.25V reference. By connecting PFI to a resistive divider from the battery or unregulated rail, designers can generate a PFO (Power-Fail Output) alert when that voltage drops below the programmed threshold - enabling early-warning low-battery detection or auxiliary supply fault indication.
What is the function of the MR pin on MAX706PEUA+?
The MR (Manual Reset) pin on MAX706PEUA+ is an active-low input that triggers a full 200ms active-high RESET pulse when pulled below 0.6V. It is internally pulled up with a 70µA current source, allowing direct connection to a pushbutton switch (to GND) without external components. The MR input is TTL/CMOS-compatible and accepts pulses as short as 500ns at VCC = 3V, making it suitable for both hardware and firmware-initiated reset events.
Is MAX706PEUA+ compatible with both 3.3V and 5V microprocessor systems?
Yes, MAX706PEUA+ operates over a wide supply range of 2.7V to 5.5V and is fully specified for both 3.3V and 5V µP systems. Its reset threshold (2.63V), watchdog timing (1.6s), and output drive levels (e.g., RESET VOH ≥ 0.8×VCC) are guaranteed across this range. Electrical characteristics tables explicitly list parameters for VCC = 3.0V and VCC = 5.0V, confirming interoperability without level shifters or redesign.
MAX706PEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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-uMAX/uSOP
MAX706PEUA+ FAQ
1.How can I place an order for MAX706PEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706PEUA+ 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 MAX706PEUA+ reliable?
The price and inventory of MAX706PEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706PEUA+ is usually 5 days.
3.What payment methods are accepted for MAX706PEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706PEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706PEUA+?
MAX706PEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706PEUA+ 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 MAX706PEUA+?
For technical support, including MAX706PEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706PEUA+ requirements.
6.How does Aetrix verify that MAX706PEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706PEUA+ 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 MAX706PEUA+ meets industry standards.
7.What is the process for return or replacement of MAX706PEUA+?
All MAX706PEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706PEUA+, 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 MAX706PEUA+ part is unused and in its original packaging.
Return procedure for MAX706PEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX706PEUA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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