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Analog Devices Inc./Maxim Integrated MAX6701ALKA
- Part No.:
- MAX6701ALKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6701ALKA.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,810
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Product details
Overview
MAX6701ALKA 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 +4.63V supply (L-suffix threshold), guarantees reset validity down to VCC = 1V, and supports critical µP power monitoring in automotive and industrial controllers.
For engineers reviewing the MAX6701ALKA datasheet, MAX6701ALKA pinout, MAX6701ALKA application, or MAX6701ALKA equivalent, key selection criteria include reset threshold accuracy (±3% over -40°C to +125°C), immunity to short VCC transients, guaranteed 140ms reset timeout delay, and compatibility with triple-voltage supervision via external resistor dividers on RST_IN1/RST_IN2.
Technical Context
The MAX6701ALKA implements a precision voltage-monitoring architecture with three independent comparators: one for VCC (4.63V nominal threshold), and two user-adjustable inputs (RST_IN1, RST_IN2) referenced to an internal 0.62V bandgap. Its reset generator enforces a fixed 140ms timeout after any undervoltage event, including brownout recovery.
It integrates a 1.6s watchdog timer with independent WDO output that latches low on timeout or undervoltage, deasserting only upon valid WDI edge or MR assertion. The device operates across 1.2V to 5.5V VCC and maintains functional reset down to 1V, with 60ppm/°C temperature coefficient on reset threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V (L-suffix), ±3% tolerance over full temperature range - ensures reliable reset initiation at defined supply rail |
| Reset Timeout Period | 140ms (typ), 120–300ms (min–max) - guarantees sufficient processor initialization time after power stabilization |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s (min–max) - provides robust software activity monitoring without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), 593–642mV (min–max) - enables precise early-warning detection of secondary supply collapse |
| Supply Current | 9–20µA at VCC < 3.6V - minimizes system standby power consumption |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| Reset Output Type | Active-low push-pull - drives logic directly without external pull-up, sinks 3.2mA at VCC ≥ 4.25V |
Pinout & Package
MAX6701ALKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA variation, drawing 21-0078F), with 0.65mm pitch, 2.80 × 2.90mm body, and 1.45mm max height. Pin 1 marked by dot; coplanarity ≤ 4 mils.
| 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 |
| 2 VCC | Main supply voltage input | Primary power source for internal circuitry and reset output driver; monitored for 4.63V threshold |
| 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; accepts external resistive divider for secondary supply 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; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Push-pull output asserted low during VCC undervoltage, MR assertion, or watchdog timeout; valid down to VCC = 1V |
| 8 WDO | Active-low watchdog output | Independent open-drain output latched low on watchdog timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision capability | Simultaneous monitoring of VCC (4.63V), RST_IN1, and RST_IN2 via external dividers - supports multirail systems without extra ICs |
| Guaranteed reset validity to 1V | RESET output remains functional and low until VCC drops below 1V - ensures clean shutdown sequencing in deep brownout |
| Immunity to short VCC transients | Rejects glitches as short as 100ns - prevents spurious resets from power rail noise or switching spikes |
| Adjustable power-fail warning | PFI/PFO pair enables programmable early-warning threshold (e.g., 3.3V supply fails at 2.9V) - allows µP to save state before power loss |
| Manual reset integration | MR pin includes internal 50kΩ pullup and 200ns glitch rejection - eliminates external components for pushbutton reset |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V and 3.3V rails in engine control firmware alongside CAN communication subsystems. IC Role / Device Role / Timing Role: Supervises primary VCC and secondary I/O supply; asserts RESET if either falls below threshold during cold cranking or load dump. Use Value: Prevents ECU lockup during battery voltage sag (e.g., 6V–9V cranking) by guaranteeing reset until VCC ≥ 4.63V and holding RESET low for 140ms post-recovery. | Use Scenario: Power supervision for modular analog input cards operating in factory automation cabinets with shared 24V DC supply. IC Role / Device Role / Timing Role: Monitors local 5V regulator output and detects early failure of 3.3V FPGA core supply using PFI divider network. Use Value: Triggers PFO interrupt to initiate graceful shutdown and data logging before 3.3V rail collapses, leveraging 0.62V reference for sub-1% trip accuracy. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit (RRU) |
Use Scenario: Ensuring deterministic startup and fault recovery in battery-backed infusion pump MCU with dual supply domains. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery-to-AC switchover and monitors backup 3.3V rail via RST_IN1. Use Value: Guarantees 140ms reset pulse even when VCC dips to 1V during switchover, preventing partial initialization and ensuring FDA-compliant safe state entry. | Use Scenario: Supervising 12V DC-DC converted rails (5V, 3.3V) in outdoor base station RRUs exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Delivers temperature-stable reset (60ppm/°C) and watchdog supervision across -40°C to +125°C operating range. Use Value: Maintains ±3% reset threshold accuracy over full temperature range, eliminating need for calibration and reducing field failure risk in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6701LKA-T | No 'A' suffix: WDO latches low on timeout and requires WDI edge to deassert; slower WDO response to VCC recovery | Less responsive to transient undervoltage events; unsuitable where fast WDO release after brownout recovery is required | Select MAX6701ALKA when immediate WDO deassertion after VCC recovery is needed; choose MAX6701LKA-T only for legacy designs matching original timing behavior |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no adjustable RST_IN pins, no PFI/PFO comparator, 200ms reset timeout | Lacks triple-supply monitoring and power-fail warning capability; limited to single-rail applications | Choose TPS3808G33DBVR for cost-sensitive single-supply systems without watchdog or PFI functionality; retain MAX6701ALKA for multivoltage, fail-safe, or early-warning requirements |
Compared with MAX6701LKA-T, MAX6701ALKA offers faster WDO recovery after VCC restoration and simplified watchdog management via MR control; versus TPS3808G33DBVR, it delivers triple-supply supervision, programmable PFI threshold, and independent watchdog output-critical for safety-critical multirail systems.
Availability
MAX6701ALKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6701ALKA 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, automotive, and communications applications.
The MAX6701–MAX6708 family was engineered specifically for high-reliability microprocessor supervision in multivoltage systems, integrating reset, watchdog, power-fail warning, and manual reset functions into a space-constrained SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6701ALKA?
The MAX6701ALKA has a nominal VCC reset threshold of 4.63V (L-suffix), with guaranteed tolerance of ±3% over the full -40°C to +125°C operating temperature range. This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" and applies exclusively to the MAX6701ALKA variant per its ordering code.
Does MAX6701ALKA support monitoring more than one supply voltage?
Yes, MAX6701ALKA supports triple-voltage supervision: primary VCC (4.63V), plus two additional supplies via RST_IN1 and RST_IN2 pins. Each adjustable input references the internal 0.62V comparator threshold, enabling precise external resistor-divider configurations for custom trip points such as 3.3V or 2.5V rails.
How does the watchdog function differ between MAX6701ALKA and non-A versions?
In MAX6701ALKA, the WDO output deasserts immediately when VCC, RST_IN1, or RST_IN2 recovers above threshold-no timeout delay. In contrast, non-A versions require a valid WDI edge to clear WDO after timeout. This makes MAX6701ALKA more responsive to transient brownouts without software intervention.
Can MAX6701ALKA operate with supply voltages below 2.5V?
Yes, MAX6701ALKA operates across VCC = 1.2V to 5.5V. Its reset output remains valid down to VCC = 1V, and internal comparators function reliably at 1.2V minimum. However, the 4.63V reset threshold applies only when VCC ≥ 4.25V; operation below that requires external RST_IN1/RST_IN2 supervision.
Is the PFI/PFO function available on MAX6701ALKA?
Yes, MAX6701ALKA includes fully functional PFI (power-fail input) and PFO (power-fail output) pins. PFI accepts external resistive dividers to set custom trip thresholds down to 0.62V, and PFO provides active-low open-drain output asserted when PFI falls below threshold-enabling early-warning power-fail detection.
MAX6701ALKA 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:
- 4.63V, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6701ALKA FAQ
1.How can I place an order for MAX6701ALKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6701ALKA 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 MAX6701ALKA reliable?
The price and inventory of MAX6701ALKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6701ALKA is usually 5 days.
3.What payment methods are accepted for MAX6701ALKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6701ALKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6701ALKA?
MAX6701ALKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6701ALKA 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 MAX6701ALKA?
For technical support, including MAX6701ALKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6701ALKA requirements.
6.How does Aetrix verify that MAX6701ALKA is sourced from the original manufacturer or authorized distributors?
All MAX6701ALKA 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 MAX6701ALKA meets industry standards.
7.What is the process for return or replacement of MAX6701ALKA?
All MAX6701ALKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6701ALKA, 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 MAX6701ALKA part is unused and in its original packaging.
Return procedure for MAX6701ALKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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