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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:2,332
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Product details
Overview
MAX6701RKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low push-pull reset output, 1.6s watchdog timeout, 0.62V power-fail comparator input, and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies with 140ms reset timeout and guarantees valid reset down to VCC = 1V. Used in automotive systems and critical µP power monitoring where brownout immunity and precise voltage supervision are required.
For engineers reviewing the MAX6701RKA datasheet, MAX6701RKA pinout, MAX6701RKA application, or MAX6701RKA equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset threshold (4.63V for 'L' suffix), watchdog behavior per A-version spec, and two validated alternative parts with documented differences.
Technical Context
The MAX6701RKA implements a dual-stage reset generator with independent watchdog timer and power-fail comparator. Its reset logic asserts active-low RESET when VCC falls below 4.63V (L-suffix), RST_IN1/RST_IN2 dip below 0.62V, MR is pulled low, or watchdog times out - with guaranteed 140ms timeout delay and immunity to short VCC transients.
It features a dedicated 0.62V internal reference for PFI/PFO operation, 50kΩ internal MR pullup, and push-pull RESET output capable of sinking 3.2mA at VCC ≥ 4.25V. The A-version WDO deasserts immediately upon recovery from undervoltage, unlike standard versions requiring WDI toggle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (L-suffix), ±3% over -40°C to +125°C - sets precise power-up reset point for +5V systems |
| Reset Timeout Delay | 140ms typical - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s typical - provides fail-safe recovery window for µP software hangs without external intervention |
| Power-Fail Input Threshold | 0.62V ±6mV - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining reset validity down to 1V |
| Output Type | Active-low push-pull RESET - eliminates need for external pullup resistor and drives CMOS/TTL loads directly |
| Quiescent Current | 12µA typical at VCC = 5V - minimizes standby power in battery-backed or energy-sensitive applications |
Pinout & Package
MAX6701RKA is housed in an 8-pin SOT23-8 package (JEDEC MO-178 BA), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and 0.65mm pitch. Pin 1 marked by dot; lead coplanarity ≤ 0.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup to VCC; pulling low forces reset and clears watchdog |
| 2 VCC | Main supply input | Primary power source for internal circuitry and reset output driver; also monitored for reset threshold violation |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output stages |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; used with external resistor divider to monitor auxiliary supplies |
| 5 PFO | Power-fail output | Active-low open-drain output asserting when PFI < 0.62V; can interrupt µP or trigger orderly shutdown |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge within 1.6s resets watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, MR activation, or watchdog timeout; sinks 3.2mA at VCC ≥ 4.25V |
| 8 WDO | Active-low watchdog output | Independent watchdog status flag; latched low on timeout or undervoltage; deasserts immediately on recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision capability | Monitors VCC plus two user-adjustable supplies (RST_IN1/RST_IN2) via 0.62V reference - enables single-chip supervision of I/O, core, and analog rails |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset state even during severe brownout, eliminating risk of undefined execution before full power loss |
| Immunity to short VCC transients | Rejects glitches < 100ns duration - prevents spurious resets from switching noise or ESD-induced supply dips |
| Independent power-fail comparator | PFI/PFO pair provides early warning of impending supply failure with externally adjustable trip point - allows µP to save state before shutdown |
| Manual reset debouncing | MR input integrates 140ms reset pulse width - eliminates need for external RC debounce network when using mechanical switches |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V sensor interface rail and 3.3V MCU core supply in harsh temperature environments (-40°C to +125°C). IC Role / Device Role / Timing Role: Dual-supply reset supervisor with independent watchdog and power-fail warning for fault-tolerant boot sequence. Use Value: Prevents ECU lockup during cold-crank voltage sag by asserting reset until both supplies stabilize above 4.63V and 3.08V thresholds. |
Use Scenario: Supervising 24V-to-5V/3.3V DC-DC outputs powering FPGA, communication ICs, and analog front-end in factory automation. IC Role / Device Role / Timing Role: Centralized power integrity monitor with manual reset override and watchdog-triggered safe-state entry. Use Value: Enables PLC to execute controlled I/O shutdown via PFO interrupt before main supply collapse, meeting IEC 61508 functional safety requirements. |
| Networking Router Power Management | White Goods Microcontroller System |
Use Scenario: Ensuring reliable boot of multi-core SoC after PoE-powered 48V-to-12V-5V-3.3V conversion chain. IC Role / Device Role / Timing Role: Primary reset generator with watchdog supervision of control firmware and power-fail detection on 12V intermediate rail. Use Value: Guarantees router reboots cleanly after brief PoE interruption by holding reset for 140ms post-recovery, avoiding partial initialization. |
Use Scenario: Supervising 5V MCU supply and 3.3V display controller rail in washing machine main board exposed to humidity and thermal cycling. IC Role / Device Role / Timing Role: Low-power, high-reliability supervisor with 12µA quiescent current and extended temperature range support. Use Value: Extends battery backup runtime during AC loss by enabling early power-fail warning (PFI) to initiate EEPROM save before main supply drops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701AKA-T | A-version with immediate WDO deassertion on undervoltage recovery (no WDI toggle required); same pinout and reset specs | Preferred where fast watchdog status update is needed after transient recovery, e.g., real-time control loops | Select MAX6701AKA-T if system requires instantaneous WDO release upon VCC restoration without software intervention |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog output - only reset + MR functions | Suitable for simpler single-rail systems lacking power-fail warning or independent watchdog signaling needs | Choose TPS3808G33DBVR only when triple-voltage supervision, PFO interrupt, or separate WDO signal are unnecessary |
Compared with MAX6701RKA, MAX6701AKA-T offers faster watchdog status recovery but identical supervision accuracy and packaging, while TPS3808G33DBVR reduces feature set to basic reset-only functionality - making MAX6701RKA optimal for designs requiring integrated power-fail warning and independent watchdog signaling.
Availability
MAX6701RKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and networking router power management requiring stable component supply across extended temperature ranges.
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 power management, sensing, and interface applications in demanding industrial and automotive environments.
The MAX6701–MAX6708 family was engineered specifically for robust microprocessor supervision in multivoltage systems, integrating reset generation, watchdog timing, and power-fail detection into compact SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6701RKA?
The MAX6701RKA uses the 'L' threshold suffix, specifying a nominal reset threshold of 4.63V with ±3% tolerance over -40°C to +125°C. This value is factory-trimmed and guaranteed in production testing, ensuring precise power-up sequencing for +5V microprocessor systems without external adjustment.
Does MAX6701RKA support triple-voltage supervision?
Yes, MAX6701RKA supports triple-voltage supervision by monitoring VCC plus two additional supplies via RST_IN1 and RST_IN2 pins. Each uses the internal 0.62V reference with external resistor dividers to set custom thresholds - enabling simultaneous supervision of I/O, core, and analog rails in a single IC.
How does the watchdog function behave in MAX6701RKA?
In MAX6701RKA, the watchdog timer asserts WDO low if WDI is not toggled within 1.6s. Unlike non-A versions, the A-version (e.g., MAX6701AKA-T) deasserts WDO immediately upon VCC recovery - but MAX6701RKA itself is a standard version requiring WDI edge to clear WDO after timeout or undervoltage event.
Can MAX6701RKA monitor supplies below 1V?
No, MAX6701RKA cannot supervise supplies below 1V. Its internal circuitry requires VCC ≥ 1.2V for operation, and the 0.62V PFI comparator is intended for monitoring higher-voltage rails via resistive dividers - not direct sub-1V supply measurement. For true low-voltage monitoring, consider dedicated ultra-low-VCC supervisors.
What package type and dimensions does MAX6701RKA use?
MAX6701RKA uses an 8-pin SOT23-8 package conforming to JEDEC MO-178 BA standard: 3.00mm × 1.75mm body size, 0.65mm lead pitch, gull-wing leads, and 1.30mm maximum height. Pin 1 is marked by a dot, and coplanarity is guaranteed ≤ 0.1mm for reliable reflow soldering.
MAX6701RKA 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:
- 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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