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Analog Devices Inc./Maxim Integrated MAX6706RKA+
- Part No.:
- MAX6706RKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706RKA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,563
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Product details
Overview
MAX6706RKA+ from Maxim Integrated is an active-high push-pull microprocessor supervisory IC designed for single-supply voltage monitoring in embedded systems. It provides a guaranteed-reset output down to VCC = 1V, 140ms reset timeout delay, 0.62V power-fail comparator input, and independent watchdog timer with 1.6s timeout - all in an 8-pin SOT23 package. It is used in critical µP power monitoring for white goods and telecommunications equipment.
For engineers reviewing the MAX6706RKA+ datasheet, MAX6706RKA+ pinout, MAX6706RKA+ application, or MAX6706RKA+ equivalent, key selection criteria include its active-high reset output stage, R-suffix 2.63V VCC reset threshold, integrated manual reset input with 50kΩ internal pullup, and compatibility with 2.55V–3.6V supply ranges for industrial-grade operation.
Technical Context
The MAX6706RKA+ implements a precision undervoltage detection circuit with a fixed 2.63V (±3%) reset threshold for VCC, validated across –40°C to +125°C. Its internal watchdog timer monitors WDI transitions and asserts WDO low after 1.6s of inactivity, while the PFI/PFO comparator operates independently with 0.62V reference and 6mV hysteresis.
Reset assertion is triggered by VCC falling below threshold, MR pull-low, or watchdog timeout; RESET remains high for 140–300ms after recovery. The device guarantees valid push-pull output drive (VOH ≥ 0.8×VCC, VOL ≤ 0.4V) with sink/source capability up to 1.2mA at VCC ≥ 2.55V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (R-suffix), ±3% tolerance over –40°C to +125°C - sets precise brownout detection point for 2.55V–3.6V supplies |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP reset pulse meets minimum hold-time requirements |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides reliable software activity supervision without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse |
| Supply Current | 9–20µA at VCC < 3.6V - supports ultra-low-power battery-backed or energy-constrained applications |
| Operating Voltage Range | 1.2V to 5.5V - guarantees functional reset generation even during deep brownout conditions |
| Output Type | Active-high push-pull RESET, open-drain WDO and PFO - eliminates external pull-up components for RESET path |
Pinout & Package
MAX6706RKA+ is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup to VCC; 200ns response to MR pulse initiates full reset sequence |
| 2 VCC | Main supply input | Power source for internal circuitry and push-pull outputs; supports 1.2V–5.5V operation with guaranteed reset down to 1V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; required for accurate threshold referencing |
| 4 PFI | Power-fail monitor input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external resistor divider for custom trip points |
| 5 PFO | Power-fail output | Open-drain output asserted low when PFI < 0.62V; sinks 200µA at VCC ≥ 1.8V, enabling µP interrupt signaling |
| 6 WDI | Watchdog input | Edge-sensitive input requiring ≥50ns pulse width; clears watchdog timer on rising/falling edge, preventing spurious timeouts |
| 7 RESET | Active-high reset output | Push-pull output driven high during normal operation; asserts low only during reset condition per MAX6706 logic |
| 8 WDO | Watchdog output | Open-drain output asserted low on watchdog timeout or VCC/RST_IN undervoltage; deasserts on valid WDI transition or MR pull-low |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET output | Eliminates need for external pull-up resistor and reduces BOM count in µP reset circuits |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep brownout, critical for fail-safe shutdown in white goods |
| Independent PFI/PFO comparator | Enables dual-voltage monitoring (e.g., main + backup rail) without additional comparators or external references |
| 1.6s watchdog timeout with edge-triggered clear | Prevents lockup from software hangs while tolerating brief execution stalls in real-time firmware |
| Immunity to short VCC transients | Rejects sub-10µs supply dips, avoiding false resets in electrically noisy environments like motor-driven appliances |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Monitoring 3.3V core supply in fanless industrial PCs during thermal throttling events. IC Role / Device Role / Timing Role: Active-high RESET output holds CPU in reset until stable 3.3V is confirmed post-throttle recovery. Use Value: Prevents boot corruption caused by marginal VCC during sustained high-load operation. |
Use Scenario: Supervising PoE-powered Ethernet switches where auxiliary 2.6V bias rails may sag under load. IC Role / Device Role / Timing Role: PFI monitors 2.6V rail via resistor divider; PFO triggers µP interrupt for graceful link shutdown before failure. Use Value: Enables predictive power management instead of uncontrolled link drop during rail collapse. |
| Telecommunications | White Goods |
Use Scenario: Ensuring clean startup of baseband processors in 5G small cells powered from multi-rail DC/DC converters. IC Role / Device Role / Timing Role: MR input synchronizes reset with FPGA configuration completion; WDO guards against firmware hang during RF calibration. Use Value: Eliminates field returns due to intermittent boot failures in thermally stressed outdoor enclosures. |
Use Scenario: Monitoring 2.6V MCU supply in smart refrigerator control boards exposed to compressor-induced line noise. IC Role / Device Role / Timing Role: RESET output remains high during normal operation; asserts low only on true brownout, not transient spikes. Use Value: Reduces nuisance service calls by rejecting >60dB noise coupling from motor windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706TKA+ | 3.08V reset threshold (T-suffix) vs. 2.63V (R-suffix); otherwise identical pinout, timing, and features | Suitable for +3.3V systems with tighter margin; not interchangeable in 2.55V–2.75V designs | Select MAX6706TKA+ only if target supply nominal is ≥3.0V and brownout margin exceeds 220mV |
| MAX6706SKA+ | 2.93V reset threshold (S-suffix); same 8-pin SOT23 package and functional block diagram | Better fit for 3.0V systems with moderate noise immunity requirements; 130mV higher threshold than R-version | Prefer MAX6706SKA+ when operating near upper limit of 2.55V–3.6V range and stability at 3.0V is prioritized |
Compared with MAX6706RKA+, MAX6706TKA+ raises the reset threshold by 450mV - improving noise margin in 3.3V systems but risking premature reset in 2.6V applications - while MAX6706SKA+ offers intermediate 2.93V triggering ideal for legacy 3.0V designs with aging regulators.
Availability
MAX6706RKA+ is available at Aetrix Electronics and suitable for critical µP power monitoring, white goods control, and telecommunications infrastructure requiring stable component supply across extended temperature ranges.
Supply support for MAX6706RKA+ 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 MAX6701–MAX6708 family was engineered for compact, low-power microprocessor supervision in space-constrained embedded systems - delivering precision voltage monitoring, watchdog safety, and power-fail warning in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6706RKA+?
The MAX6706RKA+ has a factory-trimmed VCC reset threshold of 2.63V (R-suffix), with ±3% tolerance over the full –40°C to +125°C operating temperature range. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold" and applies to the falling VCC condition. The threshold is internally generated and does not require external calibration.
Does the MAX6706RKA+ support active-high reset output?
Yes, the MAX6706RKA+ provides an active-high push-pull RESET output - confirmed in the Pin Description table and Selector Guide. Unlike MAX6701/MAX6703 variants, the MAX6706RKA+ asserts RESET high during normal operation and drives it low only during reset conditions, simplifying interface with µPs requiring active-high reset signals.
Can the MAX6706RKA+ monitor multiple supply voltages?
No, the MAX6706RKA+ monitors only the VCC supply voltage. It belongs to the MAX6705(A)/MAX6706(A)/MAX6707(A) subgroup, which supports single-supply supervision with independent PFI/PFO comparator. For triple-voltage monitoring, MAX6701(A)/MAX6702(A)/MAX6703(A) variants with RST_IN1/RST_IN2 pins are required.
What is the watchdog timeout period of the MAX6706RKA+?
The MAX6706RKA+ watchdog timeout period is 1.6s typical, with a guaranteed range of 0.96s to 2.52s across –40°C to +125°C. This value is measured from last WDI edge to WDO assertion and is unaffected by VCC level within specification. The timer clears on any WDI edge or MR assertion.
Is the MAX6706RKA+ compatible with 2.5V supply systems?
Yes, the MAX6706RKA+ operates over 1.2V to 5.5V and is explicitly rated for 2.55V–3.6V supply ranges (R-suffix version). Its 2.63V reset threshold ensures reliable detection of brownout in 2.5V nominal systems, and its guaranteed reset validity down to VCC = 1V supports safe shutdown during deep undervoltage events.
MAX6706RKA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6706RKA+ FAQ
1.How can I place an order for MAX6706RKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706RKA+ 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 MAX6706RKA+ reliable?
The price and inventory of MAX6706RKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706RKA+ is usually 5 days.
3.What payment methods are accepted for MAX6706RKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706RKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706RKA+?
MAX6706RKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706RKA+ 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 MAX6706RKA+?
For technical support, including MAX6706RKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706RKA+ requirements.
6.How does Aetrix verify that MAX6706RKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6706RKA+ 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 MAX6706RKA+ meets industry standards.
7.What is the process for return or replacement of MAX6706RKA+?
All MAX6706RKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706RKA+, 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 MAX6706RKA+ part is unused and in its original packaging.
Return procedure for MAX6706RKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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