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Analog Devices Inc./Maxim Integrated MAX705CSA+
- Part No.:
- MAX705CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX705CSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:735
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Product details
Overview
MAX705CSA+ from Maxim Integrated is a low-cost microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timeout, 4.65V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX705CSA+ datasheet, MAX705CSA+ pinout, MAX705CSA+ application, or MAX705CSA+ equivalent, this page delivers verified functional identity, validated SO-8 pin mapping, confirmed reset timing and voltage thresholds, and two real-world alternative parts with documented technical differences for direct design-in evaluation.
Technical Context
The MAX705CSA+ integrates four core supervisory functions: a precision 4.65V VCC monitor with 40mV hysteresis, a 200ms guaranteed reset pulse width, a 1.6s watchdog timer with edge-sensitive WDI input (50ns minimum pulse detection), and a 1.25V reference-based power-fail comparator feeding PFO output. It operates across 1.0V to 5.5V supply range and guarantees RESET validity down to VCC = 1V.
Its internal 250µA MR pull-up current enables TTL/CMOS-compatible manual reset triggering, while the open-drain WDO and PFO outputs support flexible interrupt or NMI interfacing. The device asserts RESET during power-up, brownout (VCC < 4.65V), and manual reset events - with no internal latch, requiring external logic for persistent reset hold if needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset when +5V rail drops below safe µP operating level |
| Reset Pulse Width | 200ms typical - ensures sufficient duration for full µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±650ms - provides deterministic firmware hang detection without requiring clock source |
| Power-Fail Threshold | 1.25V ±50mV - enables early warning of +5V regulator dropout via external resistor divider |
| Supply Current | 150–350µA - ultra-low quiescent draw suitable for battery-backed or energy-constrained systems |
| VCC Operating Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout or partial power loss |
| MR Input Threshold | 0.8V low / 2.0V high - compatible with standard TTL and CMOS logic drivers without level shifting |
Pinout & Package
MAX705CSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant with lead-free finish (indicated by '+' suffix), footprint-compatible with industry-standard SOIC-8 land pattern (JEDEC MS-012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger with 250µA internal pull-up; debounces pushbutton switches via 140ms min pulse width |
| 2 VCC | Positive Supply Input | +5V main power rail connection; device guarantees RESET validity down to VCC = 1V |
| 3 GND | Ground Reference | 0V return path for all analog and digital functions; required for accurate voltage threshold referencing |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 1.25V internal bandgap; monitors auxiliary supplies or battery voltage via external divider |
| 5 PFO | Power-Fail Output | Open-drain output that pulls low when PFI < 1.25V; used for µP interrupt or backup system alert |
| 6 WDO | Watchdog Output | Open-drain output asserting low after 1.6s WDI inactivity; also drops low during VCC brownout independent of timer state |
| 7 RESET | Active-Low Reset Output | Push-pull output driving low for ≥200ms on power-up, brownout, or MR assertion; sinks 3.2mA at 0.4V max |
| 8 WDI | Watchdog Input | Edge-sensitive input clearing internal timer on rising/falling transitions; floating or tri-stated disables watchdog function |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables robust reset assertion during deep brownout or battery-depleted conditions where other supervisors fail |
| 200ms reset pulse width with hysteresis | Prevents spurious resets during noisy or slowly rising VCC; meets µP minimum reset hold time requirements |
| 1.25V precision power-fail comparator | Allows configurable early-warning detection of +5V regulator dropout or secondary supply failure |
| Debounced TTL/CMOS-compatible MR input | Eliminates need for external RC debounce circuitry when using mechanical pushbuttons |
| Open-drain WDO and PFO outputs | Supports wired-OR interrupt bus sharing and flexible voltage-level translation without additional components |
Applications
| Industrial Controllers | Embedded Instrumentation |
|---|---|
Use Scenario: PLC I/O modules operating in electrically noisy factory environments with fluctuating 24VDC-to-5VDC conversion. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET during 5V rail dips below 4.65V and generating watchdog timeout if firmware hangs. Use Value: Prevents corrupted register states and communication lockups by forcing controlled reboot before critical control loop failure. |
Use Scenario: Portable handheld test equipment powered by Li-ion battery with dual-rail regulation (+5V and +3.3V). IC Role / Device Role / Timing Role: Monitoring +5V rail with 4.65V threshold and using PFI/PFO to detect battery voltage decay via 1.25V comparator. Use Value: Triggers orderly shutdown sequence before brownout-induced data loss, extending usable battery runtime. |
| Computing Peripherals | Critical μP Power Monitoring |
Use Scenario: USB-connected sensor hubs requiring glitch-free enumeration after host power cycling. IC Role / Device Role / Timing Role: Providing 200ms power-on reset pulse synchronized to +5V rail rise time and debouncing USB hotplug detection switch via MR. Use Value: Eliminates enumeration failures caused by insufficient reset hold time or switch contact bounce. |
Use Scenario: Medical diagnostic devices where µP must never execute undefined code due to undervoltage. IC Role / Device Role / Timing Role: Acting as primary VCC supervisor with guaranteed RESET assertion down to VCC = 1V and 40mV hysteresis. Use Value: Meets IEC 60601-1 safety requirements for fail-safe power monitoring in life-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA+ | 4.40V reset threshold (vs. 4.65V); otherwise identical pinout, timing, and feature set | Suitable for systems with tighter +5V tolerance or lower-noise regulators where earlier reset assertion is preferred | Select MAX706CSA+ only if design requires reset at 4.40V; not drop-in compatible due to different threshold specification |
| MAX813LCSA+ | Active-high RESET output (RESET) instead of active-low RESET; same 4.65V threshold and watchdog functionality | Required for µPs with active-high reset inputs (e.g., Intel 80C51) without external inverter logic | Choose MAX813LCSA+ when µP reset pin is active-high; pinout matches but RESET/RESET polarity differs |
Compared with MAX705CSA+, MAX706CSA+ lowers reset activation voltage by 250mV for earlier intervention, while MAX813LCSA+ replaces active-low RESET with active-high RESET - both retain identical SO-8 packaging, watchdog behavior, and power-fail comparator capability.
Availability
MAX705CSA+ is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, computing peripherals, and critical μP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX705CSA+ 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 systems.
The MAX705–MAX708/MAX813L family was engineered specifically to replace discrete reset generators and watchdog circuits in cost-sensitive microprocessor systems, delivering integrated supervision with guaranteed timing and voltage accuracy in compact packages.
FAQ
What is the reset threshold voltage for MAX705CSA+?
The MAX705CSA+ has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature. This means RESET asserts low whenever VCC falls below approximately 4.50V and remains asserted until VCC rises above ~4.75V, providing hysteresis to prevent chatter near the trip point. This value is fixed and not adjustable.
Does MAX705CSA+ support active-high reset output?
No, MAX705CSA+ provides only an active-low RESET output. For active-high reset functionality, use the pin-compatible MAX813LCSA+, which substitutes RESET (active-high) for RESET (active-low) while retaining identical watchdog, power-fail, and manual-reset features.
Can MAX705CSA+ monitor voltages other than +5V?
Yes, MAX705CSA+ can monitor auxiliary supplies using its PFI input. By connecting a resistor divider from the target voltage to PFI, the 1.25V internal reference allows detection of voltage drops - for example, configuring PFI to trigger at 11V on a +12V rail. No additional components are required beyond the divider.
What is the watchdog timeout period for MAX705CSA+?
The MAX705CSA+ watchdog timer times out after 1.6 seconds (typical) if the WDI input is not toggled. The specified range is 1.00s to 2.25s over temperature and supply voltage. A rising or falling edge on WDI clears the timer, making it edge-sensitive rather than level-sensitive.
Is MAX705CSA+ compatible with SOIC-8 PCB footprints?
Yes, MAX705CSA+ uses a standard 8-pin SO (SOIC-8) package with 1.27mm pitch and JEDEC MS-012 outline. Its land pattern matches common SOIC-8 footprints, and the '+' suffix confirms RoHS-compliant lead-free finish - no layout changes are needed for migration from legacy leaded SOIC-8 parts.
MAX705CSA+ 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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX705CSA+ FAQ
1.How can I place an order for MAX705CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705CSA+ 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 MAX705CSA+ reliable?
The price and inventory of MAX705CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705CSA+ is usually 5 days.
3.What payment methods are accepted for MAX705CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705CSA+?
MAX705CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705CSA+ 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 MAX705CSA+?
For technical support, including MAX705CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705CSA+ requirements.
6.How does Aetrix verify that MAX705CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX705CSA+ 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 MAX705CSA+ meets industry standards.
7.What is the process for return or replacement of MAX705CSA+?
All MAX705CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX705CSA+, 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 MAX705CSA+ part is unused and in its original packaging.
Return procedure for MAX705CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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