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Analog Devices Inc./Maxim Integrated MAX707MSA/PR
- Part No.:
- MAX707MSA/PR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX707MSA/PR.pdf
- Description:
- LOW-COST, MICROPROCESSOR SUPERVI
- Quantity:
- Payment:
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Inventory:2,100
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Product details
Overview
MAX707MSA/PR 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). It asserts RESET when VCC drops below 4.65V, delivers 200ms reset pulse width, guarantees RESET validity down to VCC = 1V, and operates from 1.0V to 5.5V supply - used in industrial controllers and embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX707MSA/PR datasheet, MAX707MSA/PR pinout, MAX707MSA/PR application, or MAX707MSA/PR equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Maxim's official electrical characteristics and pin configuration data for the MAX707 family in SO-8 package.
Technical Context
The MAX707MSA/PR integrates four core supervisory functions: precision 4.65V supply-voltage monitoring with 40mV hysteresis, debounced TTL/CMOS-compatible active-low manual-reset input (MR), 1.25V threshold power-fail comparator (PFI/PFO), and active-high RESET output with guaranteed logic level down to VCC = 1V. Unlike MAX705/MAX706, it substitutes watchdog timeout functionality with a second reset output (RESET), eliminating WDI/WDO pins.
Its internal reset generator ensures 200ms minimum pulse width after power-up or MR assertion, with response time under 250ns from MR to RESET deassertion. The PFI comparator features ultra-low input current (±25nA) and fast 400ns assertion/deassertion, enabling accurate early-warning detection for +5V or scaled external supplies.
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 nominal - ensures full μP initialization before release |
| Supply Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout |
| Supply Current | 50µA typical (C-grade) - enables low-power battery-backed operation |
| PFI Input Threshold | 1.25V ±50mV - precise reference for power-fail or low-battery warning |
| MR Input Threshold | 0.8V low / 2.0V high - compatible with TTL and CMOS logic levels |
| RESET Output Drive | Sinks 1.2mA at 0.4V - directly interfaces with standard μP reset inputs |
Pinout & Package
MAX707MSA/PR is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint per outline 21-0041. Pin 1 is marked with a beveled corner or dot; device orientation follows standard SO-8 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250µA pull-up; 140ms debounce via reset timing |
| 2 (VCC) | Positive Supply Input | +1.0V to +5.5V main power rail; powers all internal comparators and reset logic |
| 3 (GND) | Ground Reference | 0V return path for all analog and digital functions; must be low-impedance |
| 4 (PFI) | Power-Fail Input | Non-inverting comparator input referenced to 1.25V; monitors external voltage dividers |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; interrupts μP before dropout |
| 6 (RESET) | Active-High Reset Output | Inverted complement of RESET; drives high during normal operation; low during reset |
| 7 (RESET) | Active-Low Reset Output | Standard open-drain reset signal; guaranteed low ≤0.4V at 1.2mA sink load |
| 8 (VCC) | Positive Supply Input | Duplicate VCC pin for improved power integrity; must be connected to same rail as Pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at VCC = 1V | Enables fail-safe reset assertion during severe brownout, preventing μP lockup |
| 200ms Reset Pulse Width | Meets Intel 80C51 and similar μP minimum reset duration requirements |
| 1.25V Precision Power-Fail Comparator | Supports accurate early-warning detection for +5V, +12V, or negative rails via external divider |
| Debounced Manual-Reset Input | Eliminates need for external RC filtering; accepts pushbutton or logic-level assertion |
| 40mV Reset Threshold Hysteresis | Prevents oscillation during slow VCC ramp-up/down near 4.65V trip point |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Real-time control logic in programmable logic controllers subject to line transients and backup battery switchover. IC Role / Device Role / Timing Role: Supervises +5V main rail and backup supply; asserts RESET on brownout and releases only after stable 200ms delay. Use Value: Prevents corrupted state machine transitions during AC dropout, ensuring deterministic recovery without firmware intervention. |
Use Scenario: Portable ultrasound or patient monitor with dual power sources (AC adapter + Li-ion battery). IC Role / Device Role / Timing Role: Monitors battery voltage via PFI divider; triggers PFO interrupt to initiate graceful shutdown before cutoff. Use Value: Enables >95% usable battery capacity while guaranteeing data save and safe power-down sequence. |
| Automotive Body Control Modules | Network Edge Routers |
Use Scenario: Low-voltage monitoring in 12V automotive subsystems exposed to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Detects VCC sag below 4.65V; holds μP in reset until rail stabilizes post-cold-crank. Use Value: Avoids spurious CAN bus errors or EEPROM corruption during engine start transient. |
Use Scenario: Carrier-grade Ethernet switch requiring continuous uptime and hot-swap power supply support. IC Role / Device Role / Timing Role: Uses PFI to monitor auxiliary +3.3V rail; asserts RESET if secondary supply fails before primary fails. Use Value: Enables seamless switchover between redundant PSUs without packet loss or management interface reset. |
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 function, same SO-8 package, but commercial temperature range (0°C to +70°C) vs. extended (-40°C to +85°C) for MAX707MSA/PR | Lacks extended temp rating; unsuitable for automotive or outdoor industrial deployments | Select MAX707MSA/PR when operating ambient exceeds +70°C or requires MIL-STD-883 traceability |
| MAX813LCSA | Includes watchdog timer (1.6s timeout) and active-high RESET, but no active-low RESET output; 4.65V threshold identical | Provides watchdog supervision but lacks dual-reset capability; requires WDI routing and software handling | Choose MAX707MSA/PR when hardware-only reset coordination is required without μP involvement |
Compared with MAX707CSA, MAX707MSA/PR adds extended temperature support and tighter process control; versus MAX813LCSA, it trades watchdog functionality for guaranteed dual-reset signaling - critical for systems where watchdog-induced resets must be strictly separated from power-event resets.
Availability
MAX707MSA/PR is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, automotive body electronics, and network infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX707MSA/PR 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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX707MSA/PR belongs to the MAX705–MAX708/MAX813L supervisory family, engineered specifically for cost-sensitive, high-reliability μP systems needing integrated reset, power-fail warning, and manual-reset functions in minimal board space.
FAQ
What is the reset threshold voltage for MAX707MSA/PR?
The MAX707MSA/PR has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature and supply. This value is factory-trimmed and guaranteed across the full -40°C to +85°C operating range. The threshold applies to both RESET and RESET outputs, and its 40mV hysteresis prevents chatter during slow VCC ramps. This specification is confirmed in Maxim's Electrical Characteristics table for MAX707 devices.
Does MAX707MSA/PR include a watchdog timer?
No, the MAX707MSA/PR does not include a watchdog timer. It replaces the watchdog functionality found in MAX705/MAX706 with a second reset output (RESET), providing active-high reset signaling instead of WDI/WDO pins. This is explicitly stated in the General Description: "The MAX707/MAX708 are the same as the MAX705/MAX706, except an active-high reset is substituted for the watchdog timer." The pin configuration confirms absence of WDI and WDO terminals.
What is the minimum supply voltage at which MAX707MSA/PR guarantees valid RESET output?
The MAX707MSA/PR guarantees valid RESET output down to VCC = 1.0V, as specified in the Electrical Characteristics table under "Operating Voltage Range" and confirmed in the Detailed Description section. At VCC = 1.0V, RESET is guaranteed to be ≤0.3V when sinking 50µA, enabling robust reset assertion during deep brownout conditions before system collapse.
Can MAX707MSA/PR monitor voltages other than +5V?
Yes, MAX707MSA/PR can monitor voltages other than +5V using the PFI input. Its internal 1.25V comparator reference allows external voltage dividers to scale higher rails (e.g., +12V or +24V) or negative supplies down to the 1.25V trip point. Application circuits in the datasheet demonstrate monitoring of +12V and negative rails, with accuracy dependent on resistor tolerance and PFI threshold variation.
What package type and RoHS status does MAX707MSA/PR use?
MAX707MSA/PR uses an 8-pin SO (Small Outline) package, outline 21-0041, with 1.27mm lead pitch. The "/PR" suffix indicates lead-free, RoHS-compliant packaging per Maxim's ordering conventions. This is confirmed in the Ordering Information table and Package Information section, where "S8+2" denotes SO-8 with RoHS compliance.
MAX707MSA/PR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX707MSA/PR FAQ
1.How can I place an order for MAX707MSA/PR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707MSA/PR 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 MAX707MSA/PR reliable?
The price and inventory of MAX707MSA/PR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707MSA/PR is usually 5 days.
3.What payment methods are accepted for MAX707MSA/PR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707MSA/PR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707MSA/PR?
MAX707MSA/PR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707MSA/PR 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 MAX707MSA/PR?
For technical support, including MAX707MSA/PR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707MSA/PR requirements.
6.How does Aetrix verify that MAX707MSA/PR is sourced from the original manufacturer or authorized distributors?
All MAX707MSA/PR 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 MAX707MSA/PR meets industry standards.
7.What is the process for return or replacement of MAX707MSA/PR?
All MAX707MSA/PR units undergo pre-shipment inspection (PSI). If there is an issue with MAX707MSA/PR, 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 MAX707MSA/PR part is unused and in its original packaging.
Return procedure for MAX707MSA/PR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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