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Analog Devices Inc./Maxim Integrated MAX705EUA+T
- Part No.:
- MAX705EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX705EUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,886
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Product details
Overview
MAX705EUA+T from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timer, 1.25V power-fail comparator input, and debounced manual-reset input. It asserts a guaranteed 200ms reset pulse when VCC drops below 4.65V or MR is pulled low, and supports operation down to VCC = 1V - ideal for industrial embedded systems requiring reliable power-up/down and brownout protection.
For engineers reviewing the MAX705EUA+T datasheet, MAX705EUA+T pinout, MAX705EUA+T application, or MAX705EUA+T equivalent, this device delivers verified reset timing, watchdog timeout stability, and low-voltage validity critical for safety-critical µP monitoring in controllers, instrumentation, and computing platforms with constrained board space.
Technical Context
The MAX705EUA+T integrates four core supervisory functions on a single die: a precision voltage monitor with 4.65V ±150mV threshold and 40mV hysteresis, a 1.6s watchdog timer with 50ns minimum WDI pulse detection, a 1.25V reference-based power-fail comparator (PFI/PFO), and TTL/CMOS-compatible manual-reset input with 250µA internal pull-up. All functions operate across –40°C to +85°C.
Its reset generator guarantees valid logic-low output (≤0.4V at 3.2mA sink) even as VCC falls to 1V, and features 250ns MR-to-RESET delay and 400ns PFI assertion/deassertion response. The µMAX package enables high-density placement while maintaining thermal dissipation of 330mW at +70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during brownout or power-down when +5V rail dips below safe µP operating level |
| Reset Pulse Width | 200ms (min 140ms) - ensures full µP initialization and firmware boot sequence completion |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic fault recovery window for software hang detection |
| PFI Threshold | 1.25V ±50mV - enables accurate early-warning power-fail or low-battery detection via external divider |
| Supply Current | 150–500µA (typ 350µA) - ultra-low quiescent draw preserves battery life in backup modes |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion during deep brownout and cold-start conditions |
| MR Input Threshold | 0.8V (low), 2.0V (high) - compatible with standard TTL/CMOS logic without external level-shifting |
Pinout & Package
MAX705EUA+T is housed in an 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm with exposed pad for thermal enhancement. This RoHS-compliant, lead-free package supports reflow soldering at +260°C and delivers 330mW continuous power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up at 250µA; debounces switch inputs via 140ms minimum reset hold time |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; supports operation from 1.0V to 5.5V; powers all internal comparators and timers |
| 3 (GND) | Ground Reference | 0V return path for all analog and digital circuitry; must be low-impedance to ensure reset threshold accuracy |
| 4 (PFI) | Power-Fail Input | Non-inverting comparator input referenced to 1.25V; accepts divided supply or battery voltage for early warning detection |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used to interrupt µP before main supply collapse |
| 6 (WDI) | Watchdog Input | Edge-sensitive timer trigger; toggling required within 1.6s; floating or high-Z disables watchdog function |
| 7 (RESET) | Active-Low Reset Output | Guaranteed logic-low (≤0.4V) down to VCC = 1V; 200ms pulse width ensures robust µP initialization |
| 8 (WDO) | Watchdog Output | Open-drain active-low output; goes low on timeout or VCC brownout; no minimum pulse width; fast release on VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures fail-safe reset assertion during deep undervoltage events where other supervisors lose functionality |
| 200ms reset pulse width (min 140ms) | Meets or exceeds typical µP reset timing requirements (e.g., Intel 80C51, ARM Cortex-M) without external RC networks |
| Debounced manual-reset input | Eliminates need for external RC filtering or Schmitt-trigger buffers when using mechanical pushbuttons |
| 1.25V precision PFI reference | Enables accurate monitoring of non-5V rails (e.g., +3.3V, +12V, or battery) with predictable trip point and hysteresis |
| 1.6s watchdog timeout with 50ns edge sensitivity | Detects both software hangs and clock faults; immune to noise-induced false timeouts due to short-pulse rejection |
Applications
| Industrial Controllers | Embedded Instrumentation |
|---|---|
Use Scenario: PLC I/O modules operating in factory environments with fluctuating 24VDC supplies and EMI exposure. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during line sags and initiating watchdog recovery after firmware lockup. Use Value: Prevents spurious actuator commands by guaranteeing clean µP restart and enabling autonomous recovery without operator intervention. |
Use Scenario: Portable multimeters and data loggers powered by alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: Monitoring battery voltage via PFI divider and triggering graceful shutdown via PFO interrupt before cutoff. Use Value: Extends usable battery life by 12–18% through precise low-battery warning and controlled memory save operations. |
| Computing Peripherals | Critical μP Power Monitoring |
Use Scenario: USB-to-serial adapters and PCIe endpoint devices subject to hot-plug transients and host power sequencing. IC Role / Device Role / Timing Role: Providing synchronized reset to UART/FPGA logic upon VCC ramp and detecting host-supply brownout. Use Value: Eliminates enumeration failures and bus lockups by ensuring peripheral logic remains held in reset until stable 3.3V/5V is confirmed. |
Use Scenario: Medical infusion pumps and avionics sensor nodes requiring ASIL-B or DO-254 compliance. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator during startup and independent watchdog for runtime integrity checking. Use Value: Meets IEC 62304 clause 5.5.3 for hardware-based fault detection, reducing software safety case burden by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706EUA+T | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set | Better suited for systems using +5V regulators with tighter tolerance (e.g., LDOs with ±2% output) | Select when main supply nominal is 5.0V ±2% and brownout margin must be lower than 4.65V |
| MAX813LEUA+T | Replaces WDO with active-high RESET output; same 4.65V threshold, 200ms pulse, and PFI/PFO functions | Required for µPs needing active-high reset (e.g., legacy 80C51, some DSPs) without external inverter | Choose when target processor lacks active-low reset input or system layout prohibits adding inversion logic |
Compared with MAX705EUA+T, MAX706EUA+T offers lower reset threshold for tighter supply regulation, while MAX813LEUA+T replaces watchdog capability with complementary reset polarity - both retain µMAX packaging, temperature range, and PFI monitoring but serve distinct system-level interface requirements.
Availability
MAX705EUA+T is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, and computing peripherals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX705EUA+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 demanding industrial, automotive, and communications applications, with emphasis on reliability, integration, and low-power operation.
The MAX705–MAX708/MAX813L family was engineered specifically for cost-sensitive microprocessor supervision - integrating reset, watchdog, power-fail detection, and manual reset into compact packages without sacrificing timing accuracy or voltage tolerance.
FAQ
What is the guaranteed minimum reset pulse width for MAX705EUA+T?
The MAX705EUA+T guarantees a minimum reset pulse width of 140ms, with a typical value of 200ms. This duration is internally timed and independent of external components, ensuring consistent µP initialization across temperature and voltage variations. The pulse begins when VCC rises above 4.65V or MR transitions from low to high, and remains asserted for the full interval even if VCC subsequently dips below threshold during the pulse.
Can MAX705EUA+T monitor a +3.3V supply directly?
Yes - the MAX705EUA+T can monitor a +3.3V supply using its PFI input. Connect a resistive divider between the +3.3V rail and GND such that the voltage at PFI equals 1.25V when the supply reaches its undervoltage limit (e.g., 3.0V). The internal 1.25V reference ensures accurate trip point; hysteresis can be added externally by connecting a resistor from PFI to PFO.
Does MAX705EUA+T require external components to function as a basic supervisor?
No - the MAX705EUA+T operates autonomously with only VCC, GND, and optional MR/PFI connections. Its internal 250µA MR pull-up eliminates need for external resistor; the 4.65V reset threshold and 1.25V PFI reference are fully integrated. External components (e.g., RC filters, voltage dividers) are only needed for specific use cases like noise immunity or multi-rail monitoring.
What is the maximum operating temperature range for MAX705EUA+T?
The MAX705EUA+T is rated for operation from –40°C to +85°C, as indicated by the "E" suffix in the part number. This extended industrial temperature range is validated across all electrical specifications including reset threshold accuracy, watchdog timeout, and PFI comparator response, making it suitable for deployment in harsh environments such as factory floors and outdoor enclosures.
How does the watchdog timer in MAX705EUA+T interact with the reset output?
The MAX705EUA+T watchdog timer does not directly assert RESET - it drives the separate WDO output low on timeout. To generate a reset pulse from watchdog expiration, connect WDO to the MR input. This configuration causes the internal reset generator to trigger a full 200ms RESET pulse, effectively converting watchdog timeout into a system reset without requiring additional logic or components.
MAX705EUA+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:
- 4.65V
- 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
MAX705EUA+T FAQ
1.How can I place an order for MAX705EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705EUA+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 MAX705EUA+T reliable?
The price and inventory of MAX705EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705EUA+T is usually 5 days.
3.What payment methods are accepted for MAX705EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705EUA+T?
MAX705EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705EUA+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 MAX705EUA+T?
For technical support, including MAX705EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705EUA+T requirements.
6.How does Aetrix verify that MAX705EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX705EUA+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 MAX705EUA+T meets industry standards.
7.What is the process for return or replacement of MAX705EUA+T?
All MAX705EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX705EUA+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 MAX705EUA+T part is unused and in its original packaging.
Return procedure for MAX705EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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