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Analog Devices Inc./Maxim Integrated MAX707CSA
- Part No.:
- MAX707CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX707CSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,703
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Product details
Overview
The MAX707CSA from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SO package, providing active-high RESET output, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and debounced manual-reset input. It guarantees valid RESET down to VCC = 1V and delivers a 200ms reset pulse width for reliable μP initialization in industrial controllers and embedded systems.
For engineers reviewing the MAX707CSA datasheet, MAX707CSA pinout, MAX707CSA application, or MAX707CSA equivalent, key selection criteria include reset threshold accuracy (±15mV), watchdog absence (replaced by active-high RESET), guaranteed operation at 1V VCC, and compatibility with TTL/CMOS logic interfaces in space-constrained SO-8 layouts.
Technical Context
The MAX707CSA implements a dual-threshold supervision architecture: a precision 4.65V ±15mV reset comparator with 40mV hysteresis ensures clean power-up sequencing, while a separate 1.25V ±5mV PFI comparator enables independent power-fail or low-battery detection. Its internal 250μA MR pull-up current eliminates external biasing.
Unlike the MAX705/MAX706 series, the MAX707CSA omits the watchdog timer and WDO output, substituting an active-high RESET output that is the logical inverse of the active-low RESET signal-enabling direct interface with μPs requiring high-asserted reset (e.g., Intel 80C51). All timing is internally generated with no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±15mV - ensures reset assertion before +5V rail drops below system operational margin |
| Reset Pulse Width | 200ms (min 140ms) - meets μP minimum reset hold-time requirements across temperature |
| VCC Operating Range | 1.0V to 5.5V - guarantees RESET validity during brownout down to 1V, enabling ultra-low-power wake-up sequencing |
| Supply Current | 50μA (typ), 350μA (max) - enables battery-backed operation for >10-year backup life in critical monitoring |
| PFI Threshold | 1.25V ±5mV - supports accurate early-warning detection of +5V regulator dropout or battery voltage sag |
| MR Input Threshold | 0.8V (low), 2.0V (high) - ensures robust TTL/CMOS compatibility and noise immunity on manual-reset lines |
| RESET Output Drive | ISINK = 1.2mA @ 0.4V - directly drives standard CMOS/TTL inputs without external buffering |
Pinout & Package
MAX707CSA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant with lead-free option available (add '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible input with 250μA internal pull-up; debounced via 140ms min pulse width |
| 2 VCC | +5V Supply Input | Primary power rail input; device operates from 1.0V to 5.5V with guaranteed RESET down to 1V |
| 3 GND | Ground Reference | 0V reference for all analog comparators and digital outputs; must be low-impedance return path |
| 4 PFI | Power-Fail Input | Non-inverting input of 1.25V comparator; monitors external voltage dividers for early warning or battery sensing |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserting when PFI < 1.25V; sinks ≥3.2mA for interrupt generation |
| 6 N.C. | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines |
| 7 RESET | Active-High Reset Output | Inverted logic of RESET; high during normal operation, pulses low only during reset assertion |
| 8 WDO | Watchdog Output | Not implemented in MAX707 - pin is unused; differs from MAX705/MAX706 which provide watchdog timeout output |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at VCC = 1V | Enables fail-safe reset assertion during deep brownout, preventing μP lockup in low-voltage conditions |
| 40mV Reset Threshold Hysteresis | Prevents oscillatory reset toggling near threshold during slow-rising/falling VCC transitions |
| Debounced Manual-Reset Input | Eliminates need for external RC filtering; 140ms minimum pulse width rejects switch contact bounce |
| 1.25V Precision Power-Fail Comparator | Supports accurate monitoring of non-5V rails (e.g., +12V via divider) with ±5mV tolerance over temperature |
| SO-8 RoHS-Compliant Packaging | Enables automated SMT assembly and meets global environmental compliance without layout redesign |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Real-time control logic in programmable logic controllers where unexpected power interruption must trigger safe state shutdown and cold restart. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to Intel 80C51-based controller upon VCC drop below 4.65V or manual emergency stop activation. Use Value: 200ms guaranteed reset pulse ensures full μP register initialization and firmware checksum validation before execution resumes. |
Use Scenario: Battery-powered portable ultrasound units requiring reliable power-fail detection to save image buffers before shutdown. IC Role / Device Role / Timing Role: PFI monitors divided +12V supply; PFO triggers μP interrupt to initiate flash memory write and display blackout sequence. Use Value: 1.25V ±5mV PFI threshold enables detection of +12V droop to 11.0V (±0.1V) - sufficient warning for 500ms data preservation window. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Microcontroller-based door-lock actuator modules exposed to wide automotive battery voltage transients (6V–16V). IC Role / Device Role / Timing Role: VCC-supervised reset generator ensuring μP remains held in reset during cranking-induced 6V dips, with MR supporting service-mode reinitialization. Use Value: 1.0V–5.5V operating range and 250μA MR pull-up allow direct integration without level-shifting or external bias resistors. |
Use Scenario: Revenue-grade electricity meters with backup supercapacitor maintaining RTC and metering registers during AC mains loss. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET on main 5V rail collapse while PFI monitors supercap voltage to trigger graceful register freeze before backup depletion. Use Value: 50μA typical supply current extends supercap lifetime beyond 10 years under continuous backup operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CUA | Same functionality and specs, but in 8-pin μMAX (3mm × 3mm) package - 44% smaller footprint than SO-8 | Preferred for ultra-compact PCBs where board area is constrained; thermal resistance higher (4.10mW/°C derating) | Select MAX707CUA when miniaturization outweighs thermal or hand-soldering considerations |
| MAX813LCSA | Includes watchdog timer (1.6s timeout) and active-high RESET, but lacks WDO output; identical SO-8 package and 4.65V threshold | Suitable where watchdog supervision is required alongside reset, e.g., firmware hang detection in remote telemetry nodes | Choose MAX813LCSA only if watchdog functionality is mandatory; otherwise MAX707CSA offers lower cost and simpler BOM |
Compared with MAX707CUA and MAX813LCSA, the MAX707CSA provides optimal balance of SO-8 manufacturability, guaranteed 1V reset validity, and cost efficiency for non-watchdog supervisory roles - making it ideal for volume industrial controllers where layout stability and supply-chain simplicity are prioritized.
Availability
MAX707CSA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX707CSA 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, medical, and communications applications - emphasizing reliability, low power, and integration.
The MAX707CSA belongs to the MAX705–MAX708/MAX813L supervisory family, engineered specifically for cost-sensitive, space-constrained μP systems needing guaranteed reset behavior, power-fail warning, and manual-restart capability without external components.
FAQ
What is the reset threshold voltage of the MAX707CSA?
The MAX707CSA has a nominal reset threshold of 4.65V with ±15mV tolerance over temperature and supply variation. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The 40mV hysteresis prevents chatter during slow VCC transitions. The MAX707CSA does not support adjustable thresholds - it is fixed at 4.65V, unlike some members of the broader MAX70x family.
Does the MAX707CSA include a watchdog timer?
No, the MAX707CSA does not include a watchdog timer. It is functionally distinct from the MAX705/MAX706 series, which integrate a 1.6-second watchdog timeout and WDO output. The MAX707CSA substitutes an active-high RESET output (pin 7) and omits WDI/WDO functionality entirely - confirmed by pin configuration tables and block diagrams in the official datasheet.
Can the MAX707CSA operate with VCC below 4.75V?
Yes, the MAX707CSA is fully specified to operate from VCC = 1.0V to 5.5V. Its RESET output remains valid and functional down to 1.0V, a key differentiator for brownout resilience. At VCC = 1.0V, RESET is guaranteed to sink ≥50μA while staying ≤0.3V - enabling safe μP halt even during severe undervoltage events.
What is the purpose of the N.C. pin (pin 6) on the MAX707CSA?
Pin 6 on the MAX707CSA is designated N.C. (No Connect) and is internally unconnected. It must not be tied to any voltage or signal; best practice is to leave it floating or connect it to GND per Maxim's layout recommendations. This differs from the MAX705/MAX706, where pin 6 is WDO - confirming the MAX707CSA's functional divergence.
How does the MAX707CSA handle power-fail detection?
The MAX707CSA uses its PFI (pin 4) and PFO (pin 5) pins to implement power-fail detection. PFI accepts an external voltage (e.g., from a resistor divider); when that voltage falls below 1.25V ±5mV, PFO pulls low to signal impending failure. Unlike reset assertion, PFO responds within 400ns - enabling fast interrupt-driven response for data preservation or system shutdown sequences.
MAX707CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
MAX707CSA FAQ
1.How can I place an order for MAX707CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707CSA 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 MAX707CSA reliable?
The price and inventory of MAX707CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707CSA is usually 5 days.
3.What payment methods are accepted for MAX707CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707CSA?
MAX707CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707CSA 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 MAX707CSA?
For technical support, including MAX707CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707CSA requirements.
6.How does Aetrix verify that MAX707CSA is sourced from the original manufacturer or authorized distributors?
All MAX707CSA 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 MAX707CSA meets industry standards.
7.What is the process for return or replacement of MAX707CSA?
All MAX707CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX707CSA, 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 MAX707CSA part is unused and in its original packaging.
Return procedure for MAX707CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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