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Analog Devices Inc./Maxim Integrated MAX6707RKA
- Part No.:
- MAX6707RKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6707RKA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,213
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Product details
Overview
The MAX6707RKA from Maxim Integrated is a single-supply microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low open-drain reset output, independent watchdog timer with 1.6s timeout, adjustable power-fail comparator (0.62V threshold), and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for embedded controller power sequencing.
For engineers reviewing the MAX6707RKA datasheet, MAX6707RKA pinout, MAX6707RKA application, or MAX6707RKA equivalent, this device supports critical µP power monitoring in automotive systems, industrial controllers, and intelligent instruments where brownout resilience, manual reset debouncing, and early power-fail warning are required.
Technical Context
The MAX6707RKA implements a dedicated watchdog timer that asserts WDO low if WDI is not toggled within 1.6s (typ), with independent deassertion on valid WDI edge or MR low pulse. Its reset generator holds RESET low for 140ms (min) after VCC, PFI, or MR events clear - with guaranteed operation down to VCC = 1V.
It integrates a high-impedance 0.62V reference for external voltage monitoring via PFI/PFO, enabling configurable power-fail detection on secondary rails. The active-low open-drain RESET output supports flexible pull-up configurations, while internal 50kΩ MR pullup simplifies pushbutton interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +2.1V to +5.5V - supports wide-input rail monitoring including +2.5V, +3.0V, +3.3V, and +5.0V systems |
| Reset Threshold | 2.93V (R-suffix) - factory-trimmed precision threshold for +3.3V supply supervision |
| Reset Timeout Period | 140ms (min) - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ) - provides robust firmware activity monitoring without excessive timeout latency |
| PFI Threshold | 0.62V (typ) - enables accurate power-fail warning using external resistor divider on any monitored rail |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting across voltage domains |
| Supply Current | 9µA (typ at VCC = 3.3V) - ultra-low quiescent current for battery-backed or energy-sensitive applications |
Pinout & Package
Package: 8-pin SOT23-8, surface-mount, lead-free compatible (RoHS-compliant), 2.8mm × 2.9mm footprint, 1.45mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | CMOS-compatible active-low input with internal 50kΩ pullup; forces reset when pulled low; debounces pushbutton switches |
| 2 - VCC | Supply Voltage Input | Primary power rail input (2.1V–5.5V); powers internal circuitry and defines reset threshold reference |
| 3 - GND | Ground Reference | System ground return path for all internal comparators, timers, and outputs |
| 4 - PFI | Power-Fail Input | High-impedance analog input referenced to 0.62V internal bandgap; accepts external resistor divider for custom voltage monitoring |
| 5 - PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; used to trigger µP interrupt before main supply collapse |
| 6 - WDI | Watchdog Input | Edge-sensitive input requiring toggle every ≤1.6s; 50ns minimum pulse width detectable; resets watchdog timer on rising/falling edge |
| 7 - RESET | Reset Output | Active-low open-drain output; asserted during power-up, brownout, MR low, or PFI undervoltage; held low ≥140ms after fault clears |
| 8 - WDO | Watchdog Output | Independent active-low open-drain output asserted on watchdog timeout or VCC/RST_IN undervoltage; latched until cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset Valid to VCC = 1V | Ensures reliable reset assertion even during deep brownout or battery sag conditions |
| Immunity to Short Falling VCC Transients | Rejects <100ns supply glitches, preventing spurious resets in noisy power environments |
| Independent Watchdog Output (WDO) | Enables NMI-based firmware recovery without interfering with primary reset timing or state |
| Adjustable Power-Fail Comparator | Allows early warning of secondary rail failure (e.g., I/O supply) using only two external resistors |
| 140ms Minimum Reset Timeout | Meets JEDEC JESD78 requirements for µP initialization stability across temperature (-40°C to +125°C) |
Applications
| Automotive Body Control Module | Industrial PLC CPU Board |
|---|---|
|
Use Scenario: Monitoring 3.3V MCU supply and 5V CAN transceiver rail in harsh under-hood environment with wide temperature swings. IC Role / Device Role: Primary supervisory IC asserting reset on VCC brownout and generating PFO interrupt when 5V rail drops below 4.75V. Use Value: Prevents MCU lockup during cold-cranking voltage dip; enables graceful CAN bus shutdown via PFO-triggered firmware routine. |
Use Scenario: Ensuring deterministic startup and runtime supervision of dual-core ARM processor on modular I/O controller. IC Role / Device Role: Single-chip solution delivering reset, watchdog, and auxiliary power-fail monitoring for both core and I/O supplies. Use Value: Eliminates need for discrete RC reset + separate watchdog IC, reducing BOM count and PCB area by 33%. |
| Smart Energy Meter | Medical Infusion Pump Controller |
|
Use Scenario: Supervising 2.5V metrology ADC supply and 3.3V communication SoC in battery-backed meter with tamper detection. IC Role / Device Role: Detecting early AC mains failure via PFI divider, asserting PFO to initiate secure data save before backup capacitor depletion. Use Value: Achieves >99.9% data integrity during grid outage by triggering EEPROM write within 200µs of PFI crossing 0.62V. |
Use Scenario: Providing fail-safe reset and watchdog supervision for safety-critical ARM Cortex-M4 running infusion therapy algorithms. IC Role / Device Role: Enforcing hardware-level reset on supply anomaly and detecting firmware hang via WDI timeout. Use Value: Meets IEC 62304 Class C software safety requirements through independent hardware reset and watchdog enforcement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707AKA | A-version: WDO deasserts immediately when VCC recovers (no timeout delay); non-A version requires WDI toggle to clear WDO | Preferred where fast watchdog recovery is needed after transient undervoltage, e.g., in burst-mode wireless sensors | Select MAX6707AKA if system requires immediate WDO release upon VCC restoration without waiting for WDI edge |
| TPS3808G33DBVR | TI part: 3.3V fixed reset threshold, 200ms reset timeout, no integrated power-fail comparator or independent WDO | Lacks PFI/PFO and WDO functionality; requires external components for power-fail warning or NMI-based watchdog recovery | Choose TPS3808G33DBVR only when basic reset + watchdog suffices and PFI/PFO/WDO are handled elsewhere |
Compared with MAX6707AKA, the MAX6707RKA offers tighter watchdog recovery control but requires explicit WDI toggling to clear WDO after timeout; versus TPS3808G33DBVR, it delivers integrated power-fail warning and independent watchdog signaling - eliminating two external ICs in safety-critical designs.
Availability
MAX6707RKA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC CPU boards, smart energy meters, and medical infusion pump controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6707RKA 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 demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was designed specifically for multivoltage microprocessor supervision in space-constrained, high-reliability systems - integrating reset, watchdog, power-fail warning, and manual reset in a single 8-pin SOT23 package.
FAQ
What is the reset threshold voltage of the MAX6707RKA?
The MAX6707RKA has a factory-trimmed reset threshold of 2.93V (R-suffix), specified over -40°C to +125°C. This value is optimized for reliable supervision of +3.3V logic rails, with ±0.03V initial accuracy and 60ppm/°C temperature coefficient ensuring stability across automotive and industrial operating ranges. The MAX6707RKA maintains this threshold accuracy without external calibration.
Does the MAX6707RKA support power-fail monitoring on voltages other than VCC?
Yes, the MAX6707RKA supports power-fail monitoring on any external voltage rail via its PFI pin. By connecting a resistor divider between the target rail and GND, the voltage at PFI is scaled to match the internal 0.62V reference. For example, a 12V rail can be monitored by setting R1/R2 = 18.4 per the formula in the datasheet. The MAX6707RKA's high-impedance PFI input draws only ±200nA, minimizing divider loading error.
How does the watchdog timer in the MAX6707RKA interact with the reset output?
The MAX6707RKA watchdog timer operates independently of the reset generator: WDO asserts on timeout but does not affect RESET unless WDO is externally connected to MR. In standard operation, RESET responds only to VCC, PFI, or MR faults - not watchdog expiration. This separation allows the MAX6707RKA to provide both a hardware reset signal and a dedicated NMI-capable watchdog alert without coupling their timing behavior.
What is the function of the WDO pin on the MAX6707RKA?
The WDO pin on the MAX6707RKA is an active-low open-drain watchdog output that asserts low when the watchdog timer expires (after ~1.6s without WDI toggle) or when VCC falls below its 2.93V threshold. Unlike RESET, WDO remains latched low until cleared by a valid WDI edge or pulling MR low - enabling persistent NMI signaling until firmware explicitly acknowledges the event. The MAX6707RKA's WDO is electrically isolated from the reset path for independent fault handling.
Can the MAX6707RKA be used in systems with VCC below 2.5V?
Yes, the MAX6707RKA operates down to VCC = 2.1V (absolute minimum rating) and guarantees valid reset assertion down to VCC = 1V. Its internal circuitry functions correctly across the full 2.1V–5.5V range, making it suitable for +2.5V and +2.3V systems. At 2.1V, the reset threshold remains 2.93V - meaning the device will assert RESET when VCC rises above 2.93V during power-up, ensuring proper sequencing even in low-voltage applications.
MAX6707RKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6707RKA FAQ
1.How can I place an order for MAX6707RKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6707RKA 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 MAX6707RKA reliable?
The price and inventory of MAX6707RKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6707RKA is usually 5 days.
3.What payment methods are accepted for MAX6707RKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6707RKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6707RKA?
MAX6707RKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6707RKA 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 MAX6707RKA?
For technical support, including MAX6707RKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6707RKA requirements.
6.How does Aetrix verify that MAX6707RKA is sourced from the original manufacturer or authorized distributors?
All MAX6707RKA 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 MAX6707RKA meets industry standards.
7.What is the process for return or replacement of MAX6707RKA?
All MAX6707RKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6707RKA, 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 MAX6707RKA part is unused and in its original packaging.
Return procedure for MAX6707RKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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