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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:
- MAX6707 LOW-VOLTAGE, MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:466
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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 input/output (PFI/PFO) referenced to 0.62V, and manual reset input. It monitors +2.93V supply (R-suffix threshold), operates from VCC = 2.55V to 3.6V, and guarantees valid reset down to VCC = 1V - used in industrial controllers and telecom power management systems.
For engineers reviewing the MAX6707RKA+ datasheet, MAX6707RKA+ pinout, MAX6707RKA+ application, or MAX6707RKA+ equivalent, key selection criteria include its open-drain RESET/WDO outputs, PFI threshold adjustability, -40°C to +125°C operating range, and compatibility with 2.93V nominal rail supervision in space-constrained embedded designs.
Technical Context
The MAX6707RKA+ implements a dedicated voltage-monitoring architecture with three independent comparators: one for VCC (2.93V threshold), one for PFI (0.62V reference), and one internal watchdog timer circuit triggered by WDI edge transitions. Its reset generator enforces a guaranteed 140ms minimum timeout after any reset condition clears.
Unlike dual-output variants (e.g., MAX6704), this device features only a single active-low open-drain RESET output and separate active-low open-drain WDO output - both asserted during VCC brownout, watchdog timeout, or MR assertion, with WDO deasserting on valid WDI toggle or MR low pulse per A-version behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.93V (R-suffix), ±1.5% over -40°C to +125°C - sets precise brownout detection point for +3.0V/2.93V rails |
| Reset Timeout | 140ms min, 300ms max - ensures µP initialization completes before release, immune to transient dips |
| Watchdog Timeout | 1.6s typical, 0.96–2.52s over temperature - provides reliable software activity monitoring without false triggers |
| PFI Threshold | 0.62V ±5mV, 6ppm/°C drift - enables accurate external voltage-divider-based power-fail warning down to 0.62V |
| Supply Current | 9µA typical at VCC = 3.3V, 20µA max - supports ultra-low-power battery-backed or energy-harvesting applications |
| Operating Range | VCC = 2.55V to 3.6V, TA = -40°C to +125°C - qualified for automotive underhood and industrial control environments |
| Output Type | Open-drain RESET and WDO - allows wired-OR logic, level translation, and flexible pull-up configuration |
Pinout & Package
Package: 8-pin SOT23-8, 3.0mm × 1.75mm footprint, lead-free (RoHS-compliant), thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible with internal 50kΩ pullup; forces reset when pulled low; also clears watchdog on A-version |
| 2 VCC | Main supply input | Power source for internal circuitry and reset comparator; defines monitored rail; powers push-pull outputs (not applicable here) |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail input | High-impedance node connected to internal 0.62V comparator; accepts external resistor divider for custom trip points |
| 5 PFO | Power-fail output | Open-drain output asserted low when PFI < 0.62V; used to trigger µP interrupt or secondary reset via MR |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s timer; 50ns minimum pulse width supported |
| 7 RESET | Active-low reset output | Open-drain output asserted low during VCC brownout, MR assertion, or watchdog timeout; requires external pullup |
| 8 WDO | Active-low watchdog output | Independent open-drain output asserted on watchdog timeout or undervoltage; deasserts on WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable PFI threshold | 0.62V internal reference enables precise early-warning power-fail detection across multiple supply rails via external resistors |
| Guaranteed reset to 1V | RESET remains valid and low down to VCC = 1V, ensuring robust operation during deep brownouts and controlled power-down sequences |
| Immunity to VCC transients | Rejects short falling VCC glitches ≤100ns, preventing spurious resets in noisy power environments |
| Low quiescent current | 9µA typical ICC at 3.3V enables use in always-on subsystems without compromising battery life or thermal budget |
| A-version watchdog behavior | WDO deasserts immediately upon recovery from undervoltage (no timeout delay), improving system responsiveness vs. standard version |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitoring +3.3V I/O supply in programmable logic controller with watchdog supervision of firmware execution. IC Role / Device Role / Timing Role: Supervisory IC asserting open-drain RESET to hold µP in reset during brownout, and WDO to signal NMI on software hang. Use Value: Prevents corrupted state machine transitions during unstable power; 140ms timeout ensures full µP boot sequence completion before release. | Use Scenario: Early power-fail detection on +3.3V DC-DC output in carrier-grade line card to initiate graceful shutdown before backup capacitor depletion. IC Role / Device Role / Timing Role: PFI monitors regulated rail via resistor divider; PFO asserts interrupt to processor; RESET holds system in safe state. Use Value: 0.62V reference enables accurate trip point setting; 1µs PFI-to-PFO delay ensures deterministic response to voltage collapse. |
| Automotive Body Control Module | Medical Diagnostic Instrument |
Use Scenario: Supervising +2.93V microcontroller core supply in under-hood BCM exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Voltage monitor with -40°C to +125°C qualification; MR tied to ignition switch; WDI fed by periodic timer interrupt. Use Value: 60ppm/°C threshold drift maintains accuracy across temperature; 2.55V–3.6V VCC range accommodates automotive battery variation. | Use Scenario: Ensuring deterministic startup and runtime integrity of FPGA-based imaging subsystem in portable ultrasound device. IC Role / Device Role / Timing Role: Dual-role supervisor: RESET guarantees clean FPGA configuration, WDO validates real-time processing loop. Use Value: Open-drain outputs interface directly with FPGA I/O banks; 9µA supply current extends battery runtime between calibrations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707RKA-T | Same electrical specs and pinout, but leaded (SnPb) packaging instead of lead-free (+T) | Not suitable for RoHS-compliant production; requires Pb-containing solder process | Select only if legacy assembly line mandates SnPb finish and environmental compliance is waived |
| MAX6705RKA+ | Identical threshold (2.93V), same package and temperature range, but push-pull RESET instead of open-drain | Cannot perform wired-OR or level-shifted reset signaling; requires direct connection to µP reset pin | Choose when µP reset input is CMOS-compatible and no shared reset bus exists |
Compared with MAX6707RKA+, the MAX6707RKA-T offers identical functionality in SnPb packaging for legacy manufacturing, while MAX6705RKA+ replaces open-drain RESET with push-pull - simplifying layout where bus sharing or level translation isn't needed but eliminating flexibility in multi-device reset coordination.
Availability
MAX6707RKA+ is available at Aetrix Electronics and suitable for industrial controllers, telecom line cards, automotive body electronics, and medical diagnostic instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family delivers compact, low-power microprocessor supervision with integrated watchdog, power-fail detection, and manual reset - engineered for reliability in harsh environments where power integrity is mission-critical.
FAQ
What is the exact reset threshold voltage for MAX6707RKA+?
The MAX6707RKA+ has a factory-trimmed VCC reset threshold of 2.93V (R-suffix), specified with ±1.5% tolerance over -40°C to +125°C. This value is guaranteed by production test and applies to the falling VCC condition. The threshold is temperature-stable with a 60ppm/°C coefficient, making it suitable for applications where supply rail margining must remain consistent across wide ambient ranges. The MAX6707RKA+ does not support user-adjustable VCC thresholds - only PFI is externally adjustable via resistor dividers.
Does MAX6707RKA+ support watchdog timer disable?
No, the MAX6707RKA+ watchdog timer cannot be disabled. It continuously monitors the WDI pin, and if no valid edge transition occurs within the 1.6s timeout period (0.96–2.52s over temperature), WDO is asserted low. The timer resets automatically on any VCC reset, MR assertion, or WDI edge - there is no register, pin, or external command to halt or bypass the watchdog function. This design ensures fail-safe behavior in safety-critical systems where watchdog omission could lead to undetected firmware lockup.
What is the function of the PFI and PFO pins on MAX6707RKA+?
On the MAX6707RKA+, PFI is a high-impedance input connected to an internal 0.62V comparator, enabling customizable power-fail detection via external resistor dividers. PFO is its corresponding open-drain output, asserted low when PFI voltage falls below 0.62V. This pair allows early warning of impending power loss - for example, connecting PFO to a µP interrupt pin lets firmware initiate data save or shutdown routines before VCC collapses. Unlike RESET, PFO responds within 1µs and is independent of reset timeout timing, providing fast, dedicated fault signaling.
Can MAX6707RKA+ monitor multiple supply voltages simultaneously?
No, the MAX6707RKA+ monitors only a single supply voltage (VCC) for reset generation. It belongs to the MAX6705/6/7(A) subgroup, which lacks RST_IN1/RST_IN2 pins found in MAX6701/2/3(A) variants. While PFI can be used to monitor a second voltage via external divider, that signal only drives PFO - not RESET. To assert RESET on multiple rails, you would need a MAX6701A/6702A/6703A variant or cascade PFO to MR. The MAX6707RKA+'s RESET output is solely controlled by VCC, MR, or watchdog timeout - not auxiliary inputs.
What is the difference between MAX6707RKA+ and MAX6707RKA-T?
The MAX6707RKA+ and MAX6707RKA-T share identical electrical specifications, pinout, thermal performance, and functionality. The sole difference is packaging: the "+" suffix denotes lead-free (RoHS-compliant) construction with matte tin plating, while "-T" indicates traditional leaded (SnPb) termination. Both use the same 8-pin SOT23-8 package outline and are rated for -40°C to +125°C operation. Selection depends strictly on assembly process requirements - MAX6707RKA+ is mandatory for RoHS-compliant production, whereas MAX6707RKA-T may be used in legacy SnPb reflow lines.
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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 120ms 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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