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Analog Devices Inc./Maxim Integrated MAX707CUA+
- Part No.:
- MAX707CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX707CUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
The MAX707CUA+ from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, power-fail monitoring, manual-reset input, and watchdog timer disable (replaced by active-high RESET), in an 8-pin µMAX package. It asserts RESET when VCC drops below 4.65V, guarantees valid reset down to VCC = 1V, delivers 200ms reset pulse width, and supports +5V systems requiring reliable brownout detection and orderly shutdown-common in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX707CUA+ datasheet, MAX707CUA+ pinout, MAX707CUA+ application, or MAX707CUA+ equivalent, this page delivers verified functional identity, confirmed µMAX-8 package mapping, validated terminal roles, exact reset threshold (4.65V), guaranteed VCC = 1V operation, and two real-world alternative parts with documented technical and application differences.
Technical Context
The MAX707CUA+ integrates four core supervisory functions: a precision 4.65V supply monitor with 40mV hysteresis, an active-high RESET output (complement of active-low RESET), a debounced TTL/CMOS-compatible manual-reset input (MR) with 250µA internal pull-up, and a power-fail comparator (PFI/PFO) with 1.25V threshold for early warning of supply degradation or low-battery conditions.
Unlike the MAX705/MAX706 series, the MAX707CUA+ substitutes the watchdog output (WDO) with a second reset output (RESET), eliminating watchdog timeout functionality but enabling dual-polarity reset signaling. Its internal timing generator ensures 200ms minimum reset pulse width after power-up or MR assertion, and RESET remains valid even as VCC falls to 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during brownout in +5V systems; matches standard TTL/CMOS logic supply margin. |
| Reset Pulse Width | 200ms (min) - ensures sufficient duration to initialize all peripherals and clear CPU state on power-up or manual reset. |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET validity at VCC = 1V, enabling robust low-voltage detection before complete power collapse. |
| Supply Current | 50µA (typ), 350µA (max) - ultra-low quiescent draw suitable for battery-backed or energy-constrained embedded systems. |
| Power-Fail Threshold | 1.25V ±50mV - enables precise early-warning detection of failing supplies or depleted batteries via external voltage divider. |
| Manual-Reset Input | Debounced, 250µA internal pull-up - eliminates need for external RC network; compatible with pushbutton switches and logic-level signals. |
| Package | 8-pin µMAX (U8+1, 3mm × 3mm) - surface-mount footprint with 0.5mm pitch; RoHS-compliant with "+" suffix. |
Pinout & Package
The MAX707CUA+ is housed in an 8-pin µMAX package (outline 21-0036), measuring 3mm × 3mm with 0.5mm lead pitch. It features exposed pad thermal enhancement and is available in lead-free/RoHS-compliant form (indicated by "+" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up with 250µA; initiates 200ms RESET pulse when pulled below 0.8V. |
| 2 (VCC) | Positive Supply Input | +5V nominal supply rail; device operates from 1.0V to 5.5V; RESET remains valid down to VCC = 1V. |
| 3 (GND) | Ground Reference | 0V return path for all analog and digital functions; required for accurate threshold comparison and output drive. |
| 4 (PFI) | Power-Fail Input | Non-inverting input of comparator referenced to 1.25V; monitors external supply via voltage divider for early warning. |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used to interrupt µP or trigger backup actions. |
| 6 (RESET) | Active-High Reset Output | Inverted complement of RESET; drives high when VCC ≥ 4.65V and no reset condition is active; CMOS-compatible. |
| 7 (RESET) | Active-Low Reset Output | Drives low during power-up, brownout, or MR assertion; 200ms minimum pulse width; guaranteed ≤0.4V at 3.2mA sink. |
| 8 (WDO) | No Connect (NC) | Not bonded in MAX707; pin is unused and must be left floating or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at VCC = 1V | Enables fail-safe reset assertion during deep brownout, preventing undefined CPU states before full power loss. |
| 200ms Minimum Reset Pulse Width | Ensures reliable initialization of slow-starting peripherals (e.g., ADCs, serial interfaces) without external timing components. |
| 1.25V Precision Power-Fail Comparator | Supports configurable early-warning circuits for +3.3V, +5V, or negative rails using external resistive dividers. |
| Debounced Manual-Reset Input | Eliminates need for external RC debounce network; accepts direct switch closure or logic-level assertion. |
| µMAX-8 Surface-Mount Package | 3mm × 3mm footprint with 0.5mm pitch reduces PCB area by >60% vs. SO-8; compatible with automated reflow assembly. |
Applications
| Industrial Controllers | Embedded Instrumentation |
|---|---|
Use Scenario: Programmable logic controllers (PLCs) operating in factory environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M4-based control MCU during brownout events. Use Value: Prevents spurious I/O writes or corrupted register states when input voltage sags below 4.65V, ensuring deterministic recovery. |
Use Scenario: Portable handheld test equipment powered by Li-ion battery with regulated +5V rail and backup SRAM. IC Role / Device Role / Timing Role: Monitoring main supply and triggering PFO interrupt to initiate graceful data save before shutdown. Use Value: Uses 1.25V PFI threshold to detect battery voltage drop to ~3.6V, allowing ≥200ms for EEPROM write completion. |
| Communications Gateways | Medical Diagnostic Devices |
Use Scenario: Cellular IoT gateways with dual power sources (USB + coin-cell backup) and strict boot integrity requirements. IC Role / Device Role / Timing Role: Providing synchronized active-high RESET to baseband processor and active-low RESET to RF transceiver. Use Value: Dual-reset outputs eliminate need for external inverters; 200ms pulse ensures both domains reset coherently. |
Use Scenario: Ultrasound imaging front-end with FPGA, ADCs, and analog signal chain requiring fault-free startup. IC Role / Device Role / Timing Role: Asserting RESET during power ramp-up and monitoring +5V analog supply for out-of-spec conditions. Use Value: 4.65V reset threshold aligns with medical-grade +5V regulator tolerance (±3%), reducing false resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CSA+ | Same functionality and specs, but in 8-pin SO package (5.0mm × 4.0mm); higher thermal resistance (5.88mW/°C derating). | Suitable for through-hole prototyping or legacy SO-8 layouts; less space-efficient than µMAX for high-density boards. | Select MAX707CSA+ only if SO-8 footprint is fixed or thermal dissipation above 330mW is required. |
| MAX813LCUA+ | Includes watchdog timer (1.6s timeout) and active-high RESET, but lacks active-low RESET output; same 4.65V threshold and µMAX-8 package. | Better suited for systems needing watchdog supervision (e.g., remote sensors), but cannot drive dual-polarity reset loads. | Choose MAX813LCUA+ when watchdog functionality is mandatory and only one reset polarity is needed. |
Compared with MAX707CUA+, MAX707CSA+ offers identical electrical behavior in a larger SO package, while MAX813LCUA+ trades dual-reset capability for integrated watchdog-making MAX707CUA+ optimal for space-constrained designs requiring both RESET polarities without external logic.
Availability
MAX707CUA+ is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, and communications gateways requiring stable component supply across extended temperature ranges (0°C to +70°C) and long-term production continuity.
Supply support for MAX707CUA+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX705–MAX708 family was engineered specifically for cost-sensitive microprocessor systems needing integrated reset, power-fail, and manual-reset functions in minimal board space-targeting controllers, instrumentation, and critical embedded platforms.
FAQ
What is the reset threshold voltage for MAX707CUA+?
The MAX707CUA+ has a nominal reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V over temperature and supply variation. This threshold is factory-trimmed and applies to both power-up and brownout detection. The device holds RESET low until VCC rises above this threshold and sustains a 200ms delay, ensuring reliable microprocessor initialization. The 4.65V value is optimized for standard +5V logic rails with typical regulator tolerances.
Does MAX707CUA+ include a watchdog timer function?
No, the MAX707CUA+ does not include a watchdog timer. Unlike the MAX705/MAX706 series, the MAX707/MAX708 variants replace the watchdog output (WDO) with an active-high RESET output. Pin 8 (WDO) is a no-connect in the MAX707CUA+. If watchdog supervision is required, consider the MAX813LCUA+, which provides both active-high RESET and a 1.6s watchdog timeout-but lacks the active-low RESET output found on MAX707CUA+.
What is the minimum supply voltage at which MAX707CUA+ guarantees valid RESET output?
The MAX707CUA+ guarantees valid RESET output down to VCC = 1.0V. At this voltage, the active-low RESET output remains ≤0.3V when sinking 50µA, and the active-high RESET output remains ≥VCC − 1.5V when sourcing 800µA. This ultra-low-voltage operation ensures deterministic reset assertion during deep brownout conditions, preventing undefined microprocessor states before complete power collapse.
Can MAX707CUA+ monitor voltages other than +5V?
Yes, the MAX707CUA+ can monitor any DC voltage using its PFI input and internal 1.25V reference. By connecting a resistor divider between the target supply and GND-with the midpoint fed to PFI-the device triggers PFO when the divided voltage falls below 1.25V. For example, to monitor a +12V rail, use a 10:1 divider so that PFI drops to 1.25V when the input reaches ~12.5V. Hysteresis can be added via feedback from PFO to PFI for noise immunity.
What package type and RoHS status does MAX707CUA+ have?
The MAX707CUA+ uses the 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm with 0.5mm lead pitch and an exposed thermal pad. The "+" suffix explicitly denotes lead-free/RoHS-compliant construction, per Maxim's ordering convention. This package supports fine-pitch SMT assembly and offers superior thermal performance versus SO-8, with a derating factor of 4.10mW/°C above +70°C.
MAX707CUA+ 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:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/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
MAX707CUA+ FAQ
1.How can I place an order for MAX707CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707CUA+ 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 MAX707CUA+ reliable?
The price and inventory of MAX707CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707CUA+ is usually 5 days.
3.What payment methods are accepted for MAX707CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707CUA+?
MAX707CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707CUA+ 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 MAX707CUA+?
For technical support, including MAX707CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707CUA+ requirements.
6.How does Aetrix verify that MAX707CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX707CUA+ 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 MAX707CUA+ meets industry standards.
7.What is the process for return or replacement of MAX707CUA+?
All MAX707CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX707CUA+, 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 MAX707CUA+ part is unused and in its original packaging.
Return procedure for MAX707CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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