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Analog Devices Inc./Maxim Integrated MAX705ESA+TGA5
- Part No.:
- MAX705ESA+TGA5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX705ESA+TGA5.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
MAX705ESA+TGA5 from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output (4.65V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input - used to ensure reliable boot and brownout recovery in industrial controllers and embedded systems.
For engineers reviewing the MAX705ESA+TGA5 datasheet, MAX705ESA+TGA5 pinout, MAX705ESA+TGA5 application, or MAX705ESA+TGA5 equivalent, this page delivers verified functional identity, validated timing parameters, confirmed package mapping (SO-8), and real-world design implications for power-monitoring and reset integrity in 5V µP systems.
Technical Context
The MAX705ESA+TGA5 integrates four core supervisory functions on a single die: a voltage-monitoring reset generator with 4.65V ±150mV threshold and 200ms guaranteed pulse width; a watchdog timer that triggers WDO low if WDI remains static beyond 1.6s; a 1.25V precision comparator for PFI-based power-fail or low-battery warning; and a TTL/CMOS-compatible MR input with internal 250µA pull-up and 150ns minimum pulse width support.
It operates across –40°C to +85°C, guarantees RESET validity down to VCC = 1V (0.4V max sink voltage at 50µA), draws only 150–350µA supply current, and features open-drain WDO and PFO outputs with 0.4V max low-level voltage at 1.2mA sink - enabling direct interface to NMI lines or external logic without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures deterministic reset assertion before 5V rail collapse affects µP operation |
| Reset Pulse Width | 200ms typ (140–280ms min–max) - provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s - balances fault detection responsiveness against false triggers from transient software stalls |
| PFI Threshold | 1.25V ±50mV - enables accurate early-warning monitoring of +5V or scaled-down supplies via external divider |
| Supply Current | 150–350µA (TA = –40°C to +85°C) - supports low-power battery-backed or always-on supervision |
| VCC Operating Range | 1.0V to 5.5V - allows valid RESET assertion during deep brownout, critical for safe shutdown sequencing |
| MR Input Pull-Up | 250µA typical - eliminates need for external pull-up resistor when using pushbutton switch |
Pinout & Package
MAX705ESA+TGA5 is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint per outline S8+2 (Maxim document 21-0041). Pin 1 is marked by notch or dot; device orientation follows standard SO convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250µA pull-up enables direct pushbutton use without external resistor |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; RESET remains valid down to 1.0V, supporting brownout-safe assertion |
| 3 (GND) | Ground Reference | Common return for all analog and digital functions; must be low-impedance for stable comparator reference |
| 4 (PFI) | Power-Fail Input | High-impedance (±25nA) comparator input referenced to 1.25V; accepts voltage dividers for multi-rail monitoring |
| 5 (PFO) | Power-Fail Output | Open-drain output asserted low when PFI < 1.25V; sinks up to 3.2mA, compatible with µP interrupt inputs |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO timeout; floating disables watchdog function |
| 7 (RESET) | Active-Low Reset Output | Push-pull or open-drain configurable (per design); guaranteed low ≤0.4V at 50µA down to VCC = 1V |
| 8 (WDO) | Watchdog Output | Open-drain output asserted low on timeout or VCC brownout; no minimum pulse width - fast release on recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at VCC = 1V | Enables fail-safe reset assertion during deep undervoltage conditions where most µPs lose functionality |
| Debounced Manual-Reset Input | 140ms minimum reset pulse width inherently filters mechanical switch bounce without external RC network |
| Independent Power-Fail Comparator | Uncommitted PFI/PFO pair allows flexible early-warning generation for +12V, negative rails, or battery voltage via external scaling |
| Watchdog Timer with Edge-Triggered Clear | WDI rising/falling edges reset timer - supports periodic software "kick" without requiring precise timing windows |
| Low Quiescent Current (150–350µA) | Minimizes impact on battery life in backup-supervised systems while maintaining full supervisory coverage |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Continuous operation in factory-floor environments with fluctuating 5V DC supplies and EMI exposure. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET during brownout, triggering watchdog timeout on firmware hang, and signaling power-fail via PFO to initiate data save. Use Value: Prevents corrupted memory writes and unresponsive states by guaranteeing µP reset integrity under line sags and noise-induced glitches. | Use Scenario: Portable ultrasound or patient monitor requiring battery-backed operation and deterministic power-down sequence. IC Role / Device Role / Timing Role: Monitoring main +5V rail and backup battery voltage via PFI divider; asserting RESET on main rail collapse and generating low-battery interrupt via PFO. Use Value: Enables 200ms reset hold time for controlled firmware shutdown and preserves volatile configuration data before power loss. |
| Telecom Base Station Management | Automotive Infotainment Head Unit |
Use Scenario: Remote base station with unregulated DC input subject to lightning-induced transients and thermal cycling. IC Role / Device Role / Timing Role: Providing robust power-on reset, detecting undervoltage events below 4.65V, and feeding WDO to µP NMI pin for watchdog-triggered recovery. Use Value: Eliminates need for discrete RC reset circuits and reduces board space by >60% versus discrete supervision solutions. | Use Scenario: In-vehicle infotainment system exposed to cold-crank (4.5V) and load-dump (18V) conditions. IC Role / Device Role / Timing Role: Acting as primary reset supervisor for application processor; using MR input for hard-reset button; leveraging PFI to monitor 3.3V LDO output. Use Value: Ensures µP boots only after stable 5V and 3.3V rails are established, preventing boot failures during engine start cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706ESA+TGA5 | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set | Suitable for systems with tighter 5V tolerance or lower-voltage µPs requiring earlier reset assertion | Select MAX706ESA+TGA5 only if design requires reset at 4.40V; otherwise MAX705ESA+TGA5 ensures compatibility with standard 5V ±5% rails. |
| MAX813LESA+TGA5 | Active-high RESET output (RESET) instead of active-low; same 4.65V threshold, watchdog, and PFI functions | Required for µPs like Intel 80C51 that mandate active-high reset polarity | Choose MAX813LESA+TGA5 when interfacing with legacy µPs needing high-true reset; MAX705ESA+TGA5 remains optimal for modern CMOS µPs with active-low reset inputs. |
Compared with MAX706ESA+TGA5 and MAX813LESA+TGA5, the MAX705ESA+TGA5 offers the industry-standard 4.65V reset threshold for +5V systems, maintains active-low reset compatibility with most contemporary microcontrollers, and shares identical SO-8 packaging and thermal performance - making it the default choice for general-purpose 5V µP supervision.
Availability
MAX705ESA+TGA5 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, and automotive infotainment head units requiring stable component supply across extended temperature ranges.
Supply support for MAX705ESA+TGA5 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, medical, and communications applications.
The MAX705–MAX708/MAX813L family was engineered specifically to replace discrete reset generators and watchdog circuits in 5V microprocessor systems - delivering integrated supervision with guaranteed timing, low power, and wide temperature operation.
FAQ
What is the reset threshold voltage of the MAX705ESA+TGA5?
The MAX705ESA+TGA5 has a nominal reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V across –40°C to +85°C. This ensures reliable reset assertion before the +5V supply falls outside its specified ±5% tolerance band, preserving µP state integrity during brownout conditions. The MAX705ESA+TGA5 uses this fixed threshold - unlike variants such as MAX706ESA+TGA5 (4.40V) or MAX706R (adjustable).
Does the MAX705ESA+TGA5 provide both active-low and active-high reset outputs?
No, the MAX705ESA+TGA5 provides only an active-low RESET output (pin 7). It does not include the complementary active-high RESET output found in MAX707/MAX708/MAX813L variants. For designs requiring active-high reset, MAX813LESA+TGA5 is the functionally matched alternative with identical 4.65V threshold and watchdog capability - but distinct output polarity. The MAX705ESA+TGA5's single RESET output is optimized for standard µP reset inputs.
Can the MAX705ESA+TGA5 monitor voltages other than +5V?
Yes, the MAX705ESA+TGA5 can monitor any DC voltage using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting a resistive voltage divider between the target rail and GND, designers scale the monitored voltage to fall within the 1.25V window - e.g., a +12V rail can be scaled with 9.6kΩ/1.2kΩ resistors. The MAX705ESA+TGA5's high-impedance PFI input (±25nA) minimizes loading, and its open-drain PFO output interfaces directly with µP interrupt lines.
What is the watchdog timeout period for the MAX705ESA+TGA5?
The MAX705ESA+TGA5 features a fixed watchdog timeout period of 1.6 seconds, with a typical tolerance of ±0.65s (1.00s to 2.25s min–max). This timeout is triggered when the WDI (Watchdog Input) pin remains static - neither rising nor falling - for longer than 1.6s. The timer clears on any WDI edge, MR assertion, or VCC brownout, ensuring robust response to software hangs without false triggers from brief delays. This behavior is identical across all MAX705 variants including MAX705ESA+TGA5.
Is the MAX705ESA+TGA5 RoHS-compliant and lead-free?
Yes, the MAX705ESA+TGA5 is RoHS-compliant and lead-free. The "+" suffix in the part number explicitly denotes lead(Pb)-free/RoHS-compliant packaging per Maxim Integrated's ordering convention. It is supplied in an 8-pin SO package (package code S8+2) with matte tin lead finish, qualified for reflow soldering at +260°C peak temperature. No leaded version is offered for this specific variant - the "+" is integral to the orderable part number MAX705ESA+TGA5.
MAX705ESA+TGA5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX705ESA+TGA5 FAQ
1.How can I place an order for MAX705ESA+TGA5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705ESA+TGA5 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 MAX705ESA+TGA5 reliable?
The price and inventory of MAX705ESA+TGA5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705ESA+TGA5 is usually 5 days.
3.What payment methods are accepted for MAX705ESA+TGA5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705ESA+TGA5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705ESA+TGA5?
MAX705ESA+TGA5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705ESA+TGA5 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 MAX705ESA+TGA5?
For technical support, including MAX705ESA+TGA5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705ESA+TGA5 requirements.
6.How does Aetrix verify that MAX705ESA+TGA5 is sourced from the original manufacturer or authorized distributors?
All MAX705ESA+TGA5 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 MAX705ESA+TGA5 meets industry standards.
7.What is the process for return or replacement of MAX705ESA+TGA5?
All MAX705ESA+TGA5 units undergo pre-shipment inspection (PSI). If there is an issue with MAX705ESA+TGA5, 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 MAX705ESA+TGA5 part is unused and in its original packaging.
Return procedure for MAX705ESA+TGA5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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