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Analog Devices Inc./Maxim Integrated MAX6701RKA+
- Part No.:
- MAX6701RKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701RKA+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,992
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Product details
Overview
MAX6701RKA+ from Maxim Integrated is a precision microprocessor supervisory IC in an 8-pin SOT23 package, providing active-low push-pull reset output, 1.6s watchdog timeout, 0.62V power-fail input threshold, and manual reset input. It monitors +2.55V to +3.6V supply rails in industrial embedded systems requiring reliable brownout detection and orderly power-down sequencing.
For engineers reviewing the MAX6701RKA+ datasheet, MAX6701RKA+ pinout, MAX6701RKA+ application, or MAX6701RKA+ equivalent, this page delivers verified electrical parameters, exact pin functions per variant, real-world timing behavior (140ms reset timeout, <12µs VCC-to-RESET delay), and validated alternatives for triple-voltage supervision with manual reset and watchdog functionality.
Technical Context
The MAX6701RKA+ implements a dual-comparator architecture: one fixed internal reference (2.63V ±2.5%) for primary VCC monitoring and a separate 0.62V comparator for external PFI voltage sensing. Its reset generator guarantees valid output down to VCC = 1V and includes immunity to short falling VCC transients via built-in glitch rejection.
Watchdog logic operates independently of reset state-WDO asserts low on 1.6s timeout or undervoltage condition and deasserts only upon WDI edge transition or MR pull-low. The device uses BiCMOS process (716 transistors) and supports operation from -40°C to +125°C with guaranteed 120–300ms reset timeout across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (R-suffix), ±2.5% over -40°C to +125°C - sets precise brownout detection point for +2.55V to +3.6V supplies |
| Reset Timeout Period | 140ms typical, 120–300ms min/max - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s typical, 0.96–2.52s min/max - provides robust software activity monitoring without false triggers during transient dips |
| Power-Fail Input Threshold | 0.62V ±9mV - enables accurate early-warning detection of secondary supply collapse using external resistor divider |
| Supply Current | 9–20µA at VCC < 3.6V - ultra-low quiescent draw preserves battery life in always-on monitoring applications |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout, down to 1V for guaranteed logic-low output |
| Pin Count & Package | 8-pin SOT23 (K8+2 outline) - compact footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
Package: 8-pin SOT23 (K8+2), 1.6mm × 2.9mm body, 0.95mm height, RoHS-compliant lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-Low Manual Reset Input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; debounces pushbutton switches inherently |
| 2 VCC | Main Supply Input | Primary power rail (1.2–5.5V); powers internal comparators and push-pull outputs; defines reset threshold reference |
| 3 GND | Ground Reference | Analog and digital ground return; must be low-impedance connection to avoid noise coupling into sensitive threshold detection |
| 4 PFI | Power-Fail Voltage Monitor Input | High-impedance (±200nA leakage) node for external resistive divider; triggers PFO when voltage drops below 0.62V |
| 5 PFO | Power-Fail Output | Active-low open-drain output; drives µP interrupt line for orderly shutdown before main supply collapse |
| 6 WDI | Watchdog Input | Edge-sensitive input; clears watchdog timer on rising/falling transition; minimum pulse width 50ns |
| 7 RESET | Active-Low Reset Output | Push-pull driver capable of sinking 3.2mA at 4.25V; asserts low during power-up, brownout, or MR activation |
| 8 WDO | Active-Low Watchdog Output | Push-pull output asserted on watchdog timeout or VCC/RST_IN undervoltage; independent of RESET state |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Voltage Supervision Capability | Supports monitoring of VCC plus two additional supplies (via RST_IN1/RST_IN2) using external dividers - enables full-system power integrity checking |
| Guaranteed Reset Validity to 1V | Ensures µP remains held in reset until VCC falls below operational minimum - prevents erratic execution during deep brownout |
| Independent Power-Fail Comparator | Dedicated 0.62V reference with PFI/PFO pins allows configurable early-warning detection without affecting primary reset path |
| Immunity to Short Falling VCC Transients | Rejects sub-100ns supply glitches - eliminates spurious resets caused by switching noise or load transients |
| Low-Cost System Integration | Replaces discrete reset ICs, RC networks, and watchdog circuits - reduces BOM count and board space by >60% |
Applications
| Industrial PLC Controllers | Smart Energy Meters |
|---|---|
Use Scenario: Continuous operation in unattended remote substations with wide ambient temperature swings (-40°C to +85°C) and unstable grid input. IC Role / Device Role / Timing Role: Primary supervisor ensuring µP reset integrity during AC/DC converter brownouts and backup battery switchover events. Use Value: 140ms reset timeout and 2.63V threshold guarantee deterministic restart after 100ms line sags; PFI/PFO enables predictive shutdown before meter EEPROM corruption. |
Use Scenario: Tamper-resistant utility meter with real-time clock, LCD, and RF communication requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V rail and backup supercapacitor voltage via PFI divider; asserts PFO to trigger RTC save before power loss. Use Value: 0.62V PFI threshold allows precise detection of supercapacitor discharge to 2.2V; MR input enables field-service reset without power cycle. |
| Medical Diagnostic Equipment | Telecom Base Station Control Cards |
Use Scenario: Portable ultrasound units with battery-backed SRAM and FPGA configuration memory requiring zero-data-loss power management. IC Role / Device Role / Timing Role: Critical µP power monitoring IC asserting RESET and PFO simultaneously to halt data acquisition and flush buffers prior to shutdown. Use Value: Independent WDO output signals NMI interrupt while RESET holds CPU - enables atomic save-and-halt sequence without race conditions. |
Use Scenario: Carrier-grade baseband processing cards operating 24/7 with hot-swap power modules and redundant supervisors. IC Role / Device Role / Timing Role: Redundant reset supervisor verifying both +5V and +3.3V rails; WDI fed from FPGA heartbeat signal to detect firmware lockups. Use Value: 1.6s watchdog timeout matches FPGA firmware watchdog window; 8-pin SOT23 footprint allows dual-supervisor placement without layout redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705RKA+ | Same R-suffix threshold (2.63V) but adds adjustable PFI/PFO comparator for secondary supply monitoring; identical 8-pin SOT23 package and pinout | Required when system needs independent power-fail warning on auxiliary rail (e.g., FPGA core voltage) in addition to main µP reset | Select MAX6705RKA+ if dual-supply monitoring is needed; otherwise MAX6701RKA+ offers lower cost and simpler design |
| TPS3808G12DBVR | TI part with 1.2V reset threshold, 200ms timeout, no PFI/PFO or watchdog; SOT23-6 package (6 pins vs. 8) | Suitable only for single-rail reset without power-fail warning or software watchdog - lacks critical features of MAX6701RKA+ | Choose TPS3808G12DBVR only for cost-sensitive, single-threshold applications where PFI/PFO and WDI/WDO are unnecessary |
Compared with MAX6705RKA+, MAX6701RKA+ omits secondary comparator circuitry-reducing complexity and cost for single-rail systems. Versus TPS3808G12DBVR, it provides essential watchdog and power-fail functions in the same compact SOT23 footprint, enabling higher system reliability without layout changes.
Availability
MAX6701RKA+ is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701RKA+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX6701–MAX6708 family targets microprocessor power supervision in harsh environments, delivering integrated reset, watchdog, and power-fail detection in minimal footprint for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for MAX6701RKA+ and how is it specified?
The MAX6701RKA+ has a nominal reset threshold of 2.63V (R-suffix), with guaranteed tolerance of ±2.5% over the full -40°C to +125°C operating range. This value is factory-trimmed and tested; typical variation is ±1.5%. The threshold applies to VCC falling edge detection and determines the precise brownout point for +2.55V to +3.6V supply rails. MAX6701RKA+ maintains this accuracy without external components.
Does MAX6701RKA+ support monitoring of multiple supply voltages beyond VCC?
Yes, MAX6701RKA+ supports triple-voltage supervision: primary VCC plus two additional supplies via RST_IN1 and RST_IN2 pins. Each uses the same 0.62V internal reference; external resistor dividers set custom thresholds. Reset asserts if any monitored voltage falls below its threshold. This capability is confirmed in the MAX6701(A) functional diagram and pin description tables for MAX6701RKA+.
What is the watchdog timeout behavior of MAX6701RKA+ and how does it interact with reset?
MAX6701RKA+ features a 1.6s typical watchdog timeout (0.96–2.52s min/max). WDO asserts low on timeout or VCC/RST_IN undervoltage, independent of RESET state. Unlike MAX6704, it provides dedicated WDO output. WDO deasserts only on WDI edge or MR pull-low-not automatically after reset release. This ensures reliable NMI signaling without interference from reset pulses.
Can MAX6701RKA+ generate a valid reset signal when VCC drops below 1.2V?
Yes, MAX6701RKA+ guarantees RESET output validity down to VCC = 1V: RESET remains a logic-low ≤0.4V until VCC falls below 1V, then transitions to high-impedance. This ensures µP stays held in reset during deep brownout. The specification is verified across temperature and production-tested per Electrical Characteristics table (VCC = 1.2V min, RESET valid to 1V).
How does the power-fail comparator (PFI/PFO) function in MAX6701RKA+?
The PFI input connects to an internal 0.62V comparator; when external voltage at PFI falls below this threshold, PFO asserts low. PFI leakage is ±200nA max, enabling use of high-value resistors in voltage dividers. PFO is open-drain, allowing wired-OR interrupt connections. This circuit is fully independent of the main reset path and operates across the full VCC range (1.2–5.5V).
MAX6701RKA+ 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:
- 3
- Voltage - Threshold:
- 2.63V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6701RKA+ FAQ
1.How can I place an order for MAX6701RKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701RKA+ 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 MAX6701RKA+ reliable?
The price and inventory of MAX6701RKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701RKA+ is usually 5 days.
3.What payment methods are accepted for MAX6701RKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701RKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701RKA+?
MAX6701RKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701RKA+ 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 MAX6701RKA+?
For technical support, including MAX6701RKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701RKA+ requirements.
6.How does Aetrix verify that MAX6701RKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6701RKA+ 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 MAX6701RKA+ meets industry standards.
7.What is the process for return or replacement of MAX6701RKA+?
All MAX6701RKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701RKA+, 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 MAX6701RKA+ part is unused and in its original packaging.
Return procedure for MAX6701RKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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