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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:3,727
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Product details
Overview
MAX707CUA from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and manual-reset input - all in an 8-pin µMAX package. It ensures reliable power-up sequencing, brownout protection, and orderly shutdown in +5V embedded systems with guaranteed RESET validity down to VCC = 1V.
For engineers reviewing the MAX707CUA datasheet, MAX707CUA pinout, MAX707CUA application, or MAX707CUA equivalent, this device serves as a low-cost, space-efficient solution for critical μP power monitoring where active-high reset assertion, precise voltage thresholding, and manual intervention capability are required.
Technical Context
The MAX707CUA integrates a precision voltage monitor with 4.65V ±150mV threshold and 40mV hysteresis, a debounced TTL/CMOS-compatible manual-reset input (MR), and a 1.25V reference-based power-fail comparator (PFI/PFO). Its active-high RESET output asserts when VCC falls below threshold and remains valid down to 1V supply.
Unlike the MAX705/MAX706 series, the MAX707CUA omits the watchdog timer and WDO output, substituting dual reset outputs (RESET and RESET) - enabling direct compatibility with Intel 80C51 and other μPs requiring active-high reset polarity without external inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset during brownout on standard +5V rails |
| Reset Pulse Width | 200ms minimum - ensures μP completes full initialization before release |
| Supply Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout |
| Power-Fail Threshold | 1.25V ±50mV - enables early warning for +5V regulator dropout or battery depletion |
| Manual-Reset Input | TTL/CMOS-compatible with 250µA internal pull-up - supports pushbutton or logic-driven reset initiation |
| Quiescent Current | 50µA typical - minimizes standby power in battery-backed systems |
| Package | 8-pin µMAX (3mm × 3mm) - provides 60% board area reduction vs. SO-8 |
Pinout & Package
MAX707CUA is housed in an 8-pin µMAX package (outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free termination (designated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Drives reset pulse when pulled below 0.8V; internally pulled up at 250µA for switch or logic interface |
| 2 VCC | +5V supply input | Primary power rail; reset generation and monitoring functions operate down to 1.0V |
| 3 GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance |
| 4 PFI | Power-fail comparator input | Monitors external voltage via resistor divider; asserts PFO when input drops below 1.25V |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used for interrupt or backup-switch control |
| 6 RESET | Active-high reset output | Asserts high during reset condition; compatible with μPs requiring non-inverted reset (e.g., 80C51) |
| 7 RESET | Active-low reset output | Complementary to RESET; provides flexibility for mixed-logic systems or legacy interface requirements |
| 8 WDO | No-connect (N.C.) | Not bonded in MAX707CUA die - pin is unused and must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET operation at VCC = 1V | Enables fail-safe reset assertion during severe brownout, preventing μP lockup |
| 200ms reset pulse width | Meets minimum reset timing requirements of most 8-/16-bit microcontrollers |
| Debounced MR input | Eliminates need for external RC filtering or Schmitt-trigger circuitry |
| 1.25V precision PFI threshold | Supports accurate early-warning detection for +5V regulator failure or battery voltage sag |
| µMAX package footprint | Reduces PCB area by >60% vs. SO-8 while maintaining same pinout compatibility |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in noisy factory environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M4 core upon 5V rail dip below 4.65V; PFI monitors auxiliary 3.3V rail for early warning. Use Value: Prevents spurious program execution during line transients, ensuring deterministic state recovery without firmware intervention. |
Use Scenario: Battery-backed data acquisition module in portable ultrasound equipment requiring graceful shutdown before Li-ion cell voltage drops below safe operating level. IC Role / Device Role / Timing Role: MAX707CUA monitors main +5V rail and uses PFI to detect falling battery voltage via resistor divider; triggers RESET to halt ADC sampling and save calibration data. Use Value: Guarantees data integrity during power loss by initiating controlled shutdown within 200ms of threshold breach. |
| Automotive Body Control Module | Point-of-Sale Terminal |
Use Scenario: Cold-cranking event in 12V automotive systems where DC-DC converter output dips below specification during engine start. IC Role / Device Role / Timing Role: Active-high RESET output directly interfaces with Infineon AURIX TC2xx microcontroller; MR pin tied to ignition signal for cold-start reset synchronization. Use Value: Eliminates need for external level shifter or inverter, reducing BOM count and improving startup reliability under sub-4.5V conditions. |
Use Scenario: Embedded payment terminal powered from USB or wall adapter, subject to intermittent disconnects and hot-plug events. IC Role / Device Role / Timing Role: Supervises +5V rail and asserts RESET on undervoltage; PFO connected to microcontroller interrupt pin to log power anomaly events before shutdown. Use Value: Enables forensic logging of power faults for field failure analysis without adding discrete comparators or timers. |
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) | Larger footprint; better thermal dissipation and hand-solderability | Select when board layout allows SO-8 and reflow compatibility with legacy assembly lines is required |
| MAX813LCUA | Identical pinout and function, but lacks active-low RESET output (only RESET provided) | Reduced reset interface flexibility; no complementary output for mixed-logic designs | Choose when only active-high reset is needed and PCB real estate is constrained - same µMAX footprint |
Compared with MAX707CSA and MAX813LCUA, the MAX707CUA uniquely delivers dual active-high/active-low reset outputs in the smallest possible footprint, making it optimal for space-constrained industrial and medical devices requiring robust reset signaling without external logic.
Availability
MAX707CUA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and point-of-sale terminals requiring stable component supply across extended production lifecycles.
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 and mixed-signal ICs for industrial, medical, and communications applications, emphasizing reliability, integration, and low-power operation.
The MAX707CUA belongs to the MAX705–MAX708/MAX813L family of microprocessor supervisory circuits, engineered specifically for cost-sensitive embedded systems needing guaranteed reset behavior, brownout immunity, and compact packaging.
FAQ
What is the reset threshold voltage for MAX707CUA?
The MAX707CUA has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature and supply variations. This threshold is factory-trimmed and applies to both RESET and RESET outputs. The device guarantees valid reset assertion down to VCC = 1V, making it suitable for deep brownout detection in battery-powered or unstable power environments. The 40mV hysteresis prevents chatter near the trip point.
Does MAX707CUA include a watchdog timer?
No, the MAX707CUA does not include a watchdog timer or watchdog output (WDO). It is functionally identical to the MAX707 series, which replaces the watchdog circuit found in MAX705/MAX706 with dual reset outputs (RESET and RESET). The WDO pin (Pin 8) is marked N.C. (no connect) in the MAX707CUA datasheet and must remain unconnected on the PCB.
Can MAX707CUA monitor voltages other than +5V?
Yes, the MAX707CUA can monitor voltages other than +5V using its PFI (Power-Fail Input) pin. By connecting a resistor divider between the target voltage rail and ground, the voltage at PFI can be scaled to match the 1.25V internal reference. For example, monitoring a +12V rail requires a ~8.6:1 divider ratio. The PFO output then provides an early-warning flag before the main supply fails.
What is the purpose of the dual RESET outputs on MAX707CUA?
The MAX707CUA provides both RESET (active-high) and RESET (active-low) outputs to support diverse microprocessor interface requirements. RESET is directly compatible with Intel 80C51 and other μPs requiring high-asserted reset, while RESET supports legacy or mixed-logic systems needing low-asserted signals. This eliminates external inverters and simplifies design across heterogeneous platforms.
Is MAX707CUA RoHS-compliant and lead-free?
Yes, the MAX707CUA is available in lead(Pb)-free/RoHS-compliant packaging. Maxim specifies lead-free versions by appending a '+' symbol to the part number (e.g., MAX707CUA+). The µMAX package uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), supporting standard reflow profiles including Pb-free peak temperatures up to +260°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:
- Obsolete
- 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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