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Analog Devices Inc./Maxim Integrated MAX705ESA+
- Part No.:
- MAX705ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX705ESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:527
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Product details
Overview
MAX705ESA+ from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timer, 4.65V supply-voltage monitor, 1.25V power-fail comparator input, and debounced manual-reset input - all critical for reliable power-up, brownout, and fail-safe recovery in embedded 5V systems.
For engineers reviewing the MAX705ESA+ datasheet, MAX705ESA+ pinout, MAX705ESA+ application, or MAX705ESA+ equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior (200ms reset pulse, 140–280ms min/max width), voltage thresholds (4.65V ±150mV), and validated alternatives for industrial control, instrumentation, and computing designs requiring guaranteed reset assertion down to VCC = 1V.
Technical Context
The MAX705ESA+ integrates four independent supervisory functions on a single die: a precision bandgap-referenced reset generator with hysteresis (40mV), a monostable watchdog timer triggered by WDI edge transitions, a high-impedance (±25nA) 1.25V comparator for PFI monitoring, and a TTL/CMOS-compatible MR input with internal 250µA pull-up. All outputs are push-pull with guaranteed logic levels at VCC ≥ 1V.
Its architecture ensures deterministic behavior during supply transients: RESET remains low for ≥140ms after VCC rises above 4.65V, WDO asserts immediately on VCC drop below threshold (no minimum pulse), and PFO responds to PFI transitions within 400ns. No external components are required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - guarantees clean reset assertion before 5V rail collapse affects µP operation |
| Reset Pulse Width | 200ms typical (140–280ms min/max) - meets Intel 80C51 and ARM Cortex-M boot timing requirements |
| Watchdog Timeout | 1.6s ±650ms - provides sufficient margin for firmware watchdog service loops without false triggers |
| PFI Threshold | 1.25V ±50mV - enables accurate early-warning detection of +5V regulator dropout via resistive divider |
| Supply Current | 150–350µA (TA = 0°C to +70°C) - supports battery-backed systems with multi-year standby life |
| Operating Voltage | 1.0V to 5.5V - ensures valid RESET output even during deep brownout or partial power loss |
| MR Input Threshold | 0.8V low / 2.0V high - compatible with 3.3V and 5V logic families without level-shifting |
Pinout & Package
MAX705ESA+ uses an 8-pin SO (Small Outline) package with standard 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix), and JEDEC MS-012AC outline. Thermal resistance θJA = 170°C/W enables operation up to +85°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger with internal 250µA pull-up; debounces switch inputs via 140ms minimum reset pulse |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; powers all internal circuits and defines reset threshold reference |
| 3 (GND) | Ground Reference | 0V return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 (PFI) | Power-Fail Input | High-impedance (±25nA) comparator input referenced to 1.25V internal bandgap; monitors auxiliary supplies or battery voltage |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output asserting when PFI < 1.25V; sinks 3.2mA to drive µP NMI or external logic |
| 6 (WDI) | Watchdog Input | Edge-sensitive input detecting rising/falling transitions; floating or high-Z disables watchdog function |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for ≥140ms on power-up/brownout; valid down to VCC = 1V |
| 8 (WDO) | Watchdog Output | Active-low push-pull output asserting on timeout or VCC drop; no minimum pulse width; fast release on VCC recovery |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables fail-safe reset assertion during severe brownout where other supervisors lose functionality |
| 200ms reset pulse width with hysteresis | Prevents µP clock instability during marginal VCC recovery by holding reset until rail stabilizes |
| Debounced MR input with 150ns pulse rejection | Eliminates mechanical switch bounce without external RC network, reducing BOM count |
| 1.25V precision PFI comparator | Allows accurate early-warning detection of +5V regulator dropout using only two external resistors |
| 1.6s watchdog timeout with edge-triggered clear | Supports firmware service intervals up to 800ms while preventing lockup from missed WDI toggles |
Applications
| Industrial PLC Control | Medical Instrumentation |
|---|---|
Use Scenario: Programmable logic controller executing safety-critical I/O sequencing during mains power interruption. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET to halt CPU execution and hold I/O in safe state until 5V rail recovers above 4.65V. Use Value: Prevents spurious relay actuation or sensor misreads during brownout by guaranteeing ≥140ms reset hold time. | Use Scenario: Portable blood glucose meter operating from coin-cell battery with backup supervisor for memory retention. IC Role / Device Role / Timing Role: Monitoring main 3.3V supply and battery voltage via PFI divider to trigger orderly shutdown before data loss. Use Value: Uses 1.25V PFI threshold and ±25nA input bias to extend battery life while enabling precise low-battery warning. |
| Network Router Boot Management | Automotive Infotainment Head Unit |
Use Scenario: Multi-core SoC boot sequence requiring synchronized reset across CPU, GPU, and peripheral domains. IC Role / Device Role / Timing Role: Generating clean, glitch-free active-low RESET pulse with 200ms duration to meet ARM TrustZone initialization timing. Use Value: Eliminates need for external RC reset generators, reducing board area and improving timing repeatability across temperature. | Use Scenario: Infotainment system powered from vehicle 12V bus through DC-DC converter, subject to load-dump transients. IC Role / Device Role / Timing Role: Detecting 5V rail collapse via VCC monitoring and asserting RESET before MCU enters undefined state during transient. Use Value: Leverages 4.65V reset threshold and 40mV hysteresis to avoid chatter during noisy 12V line fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706ESA+ | 4.40V reset threshold (vs. 4.65V); identical pinout, timing, and feature set | Better suited for systems with tighter 5V tolerance or lower-noise regulators | Select when VCC nominal is 4.75V–5.0V and brownout margin must be extended downward |
| MAX813LESA+ | Active-high RESET output only (no RESET); same 4.65V threshold, watchdog, and PFI functions | Required for µPs with active-high reset inputs (e.g., Intel 80C51, some ARM variants) | Choose when host processor mandates high-true reset signaling and no active-low output is needed |
Compared with MAX706ESA+ and MAX813LESA+, the MAX705ESA+ offers the industry-standard 4.65V reset point for legacy 5V systems, retains both active-low and active-high reset capability in other variants (though not this specific part), and provides the most widely validated timing profile for industrial control boot sequences.
Availability
MAX705ESA+ is available at Aetrix Electronics and suitable for industrial PLC control, medical instrumentation, network router boot management, and automotive infotainment head units requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX705ESA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX705–MAX708/MAX813L family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing integrated power supervision without external components - targeting embedded controllers and instrumentation where reliability under voltage transients is critical.
FAQ
What is the guaranteed minimum reset pulse width for MAX705ESA+?
The MAX705ESA+ guarantees a minimum reset pulse width of 140ms, with typical value at 200ms and maximum at 280ms. This timing ensures compatibility with microprocessors requiring extended reset assertion during power-up or brownout recovery, and is measured from the moment VCC rises above the 4.65V threshold or MR transitions from low to high. The MAX705ESA+ maintains this specification across its full operating temperature range of -40°C to +85°C.
Does MAX705ESA+ support active-high reset output?
No, the MAX705ESA+ provides only an active-low RESET output. It does not include the active-high RESET output found in MAX707/MAX708 variants or the MAX813L. If active-high reset is required, MAX813LESA+ is the direct functional alternative with identical 4.65V threshold, watchdog, and PFI features. The MAX705ESA+ pinout and internal logic are optimized for active-low reset signaling in legacy 5V µP systems.
Can MAX705ESA+ monitor voltages other than the main VCC supply?
Yes, the MAX705ESA+ can monitor auxiliary voltages using its PFI (Power-Fail Input) pin, which compares against a precise 1.25V internal reference. By connecting a resistor divider from the target voltage to PFI, designers can configure early-warning detection for +3.3V, +12V, or battery rails. The MAX705ESA+'s ±25nA PFI input bias enables high-ratio dividers with minimal error, and hysteresis can be added via feedback from PFO to improve noise immunity.
What is the watchdog timeout behavior of MAX705ESA+ during power-down?
During power-down, the MAX705ESA+ watchdog timer stops counting when VCC drops below the reset threshold (~4.65V), and WDO asserts low simultaneously with RESET. Unlike normal operation, the watchdog does not time out independently - it is synchronized to the supply rail. When VCC falls below ~1V, both RESET and WDO become high-impedance. This behavior ensures coordinated failure response without spurious interrupts during brownout, making the MAX705ESA+ robust for unattended embedded systems.
Is MAX705ESA+ compatible with 3.3V microprocessors?
The MAX705ESA+ is specified for 5V systems but operates down to VCC = 1.0V, allowing use with 3.3V µPs if the reset threshold is acceptable. However, its 4.65V reset point is optimized for 5V rails; for 3.3V systems, consider MAX6326 or MAX809 variants with 3.08V thresholds. The MAX705ESA+ MR and WDI inputs are TTL/CMOS-compatible and accept 3.3V logic levels, but RESET assertion occurs only when VCC drops below 4.65V - not the 3.3V rail itself.
MAX705ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX705ESA+ FAQ
1.How can I place an order for MAX705ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX705ESA+ 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+ reliable?
The price and inventory of MAX705ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX705ESA+ is usually 5 days.
3.What payment methods are accepted for MAX705ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX705ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX705ESA+?
MAX705ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX705ESA+ 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+?
For technical support, including MAX705ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX705ESA+ requirements.
6.How does Aetrix verify that MAX705ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX705ESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX705ESA+?
All MAX705ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX705ESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX705ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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