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Analog Devices Inc./Maxim Integrated MAX6707LKA
- Part No.:
- MAX6707LKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6707LKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:999
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Product details
Overview
MAX6707LKA 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, 0.62V power-fail comparator input (PFI), and manual reset input (MR). It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V - used in automotive control modules requiring reliable brownout detection and fail-safe restart.
For engineers reviewing the MAX6707LKA datasheet, MAX6707LKA pinout, MAX6707LKA application, or MAX6707LKA equivalent, key selection criteria include its open-drain RESET output configuration, PFI/PFO power-fail warning capability, MR debounce timing, and A-version WDO deassertion behavior on undervoltage recovery.
Technical Context
The MAX6707LKA implements a precision voltage-monitoring architecture with three internal comparators: one fixed-threshold VCC monitor (4.63V for 'L' suffix), one 0.62V reference-based PFI comparator, and a dedicated watchdog timer circuit triggered by WDI edge transitions. Its reset generator enforces a guaranteed 140ms minimum timeout after any reset condition clears.
Unlike non-A versions, the MAX6707LKA (A-version) features nonlatching WDO behavior: WDO asserts low during VCC undervoltage but deasserts immediately upon VCC recovery - independent of WDI activity - while retaining latched low behavior only on true watchdog timeout (1.6s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V (L-suffix), ±3% over -40°C to +125°C - sets primary power-up reset point for +5V systems |
| Reset Timeout Period | 140ms min, 300ms max - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s typical, 0.96–2.52s over temperature - defines maximum allowed µP activity gap before fault response |
| PFI Threshold | 0.62V ±25mV - enables precise external voltage-divider setup for secondary supply monitoring |
| Supply Current | 9–20µA at VCC < 3.6V - supports ultra-low-power always-on supervision in battery-backed systems |
| Operating Voltage Range | 1.2V to 5.5V - allows valid reset assertion even during deep brownout conditions |
| RESET Output Type | Active-low open-drain - permits wired-OR reset bus configuration with pull-up to any logic rail |
Pinout & Package
MAX6707LKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA), 3.00mm × 1.75mm body, 0.65mm pitch, with coplanarity ≤ 0.1mm. Pin 1 marked by dot; leads are lead-free compatible (replace -T with +T for RoHS-compliant ordering).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Supply Voltage Input | Primary power source for internal circuitry and reset output driver; also serves as monitored voltage for main reset threshold |
| 3 GND | Ground Reference | Analog and digital ground return; must be low-impedance connection to system common |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V internal reference; accepts external resistive divider for custom trip points |
| 5 PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; used to trigger early-warning interrupts before main supply collapse |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising or falling transition resets 1.6s watchdog timer; pulses ≥50ns detected |
| 7 RESET | Reset Output | Active-low open-drain output; held low for full reset timeout after VCC, MR, or PFI fault clears |
| 8 WDO | Watchdog Output | Active-low open-drain output; asserts on watchdog timeout or VCC/RST_IN undervoltage; deasserts immediately on VCC recovery (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Enables robust reset assertion during severe brownout - prevents µP runaway below nominal operating range |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC rail - avoids spurious resets from switching noise or load dumps |
| Independent PFI/PFO comparator | Allows early power-fail warning without affecting primary reset path - supports graceful shutdown sequencing |
| 140ms minimum reset timeout | Meets JEDEC JESD78 requirements for µP initialization time - ensures reliable boot across process/voltage/temperature corners |
| A-version WDO deassertion on VCC recovery | Eliminates need for external WDI toggling to clear watchdog alarm after transient undervoltage - simplifies firmware design |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V sensor supply and 3.3V MCU core rail in harsh under-hood environment with wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Primary supervisor enforcing power-on reset, brownout protection, and watchdog supervision of safety-critical firmware execution. Use Value: Prevents ECU lockup during battery voltage sag by asserting reset before MCU enters undefined state; PFO triggers diagnostic logging prior to shutdown. |
Use Scenario: Supervises isolated 24V-to-5V DC-DC converter output powering FPGA and communication interface in factory automation cabinet. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC monitor ensures clean FPGA startup; PFI monitors auxiliary 12V rail for fieldbus transceiver health. Use Value: Open-drain RESET enables shared reset bus across multiple FPGAs; 1.6s watchdog enforces firmware heartbeat without hardware timer overhead. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit (RRU) |
Use Scenario: Ensures fail-safe restart of ARM Cortex-M4 controller after backup battery switchover during AC mains failure. IC Role / Device Role / Timing Role: Critical power supervisor with manual reset for service mode and PFO-driven NMI interrupt for battery-level warning. Use Value: Guaranteed reset down to 1V allows operation through entire battery discharge curve; MR input enables clinician-initiated recalibration without power cycle. |
Use Scenario: Monitors +5.0V bias supply for RF power amplifier stage in outdoor 4G/5G base station equipment exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability supervisor with temperature-stable 4.63V threshold and 60ppm/°C drift - maintains reset accuracy across thermal cycling. Use Value: Immunity to fast VCC transients prevents false resets during PA burst transmission; A-version WDO behavior reduces firmware complexity in remote maintenance scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707AKA-T | Same pinout and function, but 'A' suffix denotes A-version WDO behavior (immediate deassertion on VCC recovery); identical L-threshold (4.63V) | Preferred where firmware cannot guarantee periodic WDI toggling during transient undervoltage events | Select MAX6707AKA-T if system requires automatic WDO clearance after brownout without software intervention |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no PFI/PFO, no watchdog output - only reset + MR + watchdog timer with reset output | Lacks independent power-fail warning path and dual-output watchdog capability | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications where PFI/PFO and WDO are unnecessary |
Compared with MAX6707LKA, MAX6707AKA-T offers identical supervision functionality with enhanced WDO responsiveness to supply recovery, while TPS3808G33DBVR provides lower-cost basic reset supervision at the expense of power-fail warning and independent watchdog signaling capability.
Availability
MAX6707LKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6707LKA 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family delivers compact, low-power microprocessor supervision with integrated power-fail warning and watchdog functions - engineered for reliability in safety-critical embedded systems.
FAQ
What is the reset threshold voltage for MAX6707LKA?
The MAX6707LKA has a nominal VCC reset threshold of 4.63V (L-suffix), with ±3% tolerance over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table. The threshold applies to the primary VCC monitor; PFI uses a separate 0.62V internal reference for adjustable supply monitoring. MAX6707LKA maintains guaranteed reset assertion down to VCC = 1V.
Does MAX6707LKA support manual reset functionality?
Yes, MAX6707LKA includes an active-low manual reset input (MR) on Pin 1 with an internal 50kΩ pullup resistor to VCC. Pulling MR low forces a reset pulse for the full timeout period (140–300ms), and the reset remains active for the duration even after MR is released. This feature enables pushbutton-initiated system restarts and supports firmware-triggered resets via GPIO control.
How does the watchdog timer operate in MAX6707LKA?
The MAX6707LKA watchdog timer requires a WDI edge transition every 1.6s (typical) to prevent timeout. If no transition occurs, WDO asserts low. Unlike non-A versions, MAX6707LKA (A-version) deasserts WDO immediately when VCC recovers above threshold - no WDI toggle required. WDO also asserts during VCC undervoltage regardless of watchdog state, ensuring continuous fault visibility.
What is the purpose of the PFI and PFO pins on MAX6707LKA?
PFI (Pin 4) is a high-impedance input referenced to an internal 0.62V comparator; connecting it via a resistive divider enables monitoring of secondary supplies (e.g., 12V, 3.3V) for early power-fail warning. PFO (Pin 5) is the corresponding active-low open-drain output that asserts when PFI falls below 0.62V. This pair provides an independent power-fail path decoupled from the main reset generator in MAX6707LKA.
Is MAX6707LKA pin-compatible with other devices in the MAX670x family?
Yes, MAX6707LKA shares the same 8-pin SOT23-8 footprint and pinout with all MAX6701–MAX6708 variants, including MAX6707AKA-T and MAX6705LKA. However, functional differences exist: MAX6707LKA provides open-drain RESET and WDO outputs, while MAX6704 offers complementary push-pull RESET outputs and no WDO. Always verify reset output type and watchdog behavior before substitution.
MAX6707LKA 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:
- 4.63V
- 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
MAX6707LKA FAQ
1.How can I place an order for MAX6707LKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6707LKA 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 MAX6707LKA reliable?
The price and inventory of MAX6707LKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6707LKA is usually 5 days.
3.What payment methods are accepted for MAX6707LKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6707LKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6707LKA?
MAX6707LKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6707LKA 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 MAX6707LKA?
For technical support, including MAX6707LKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6707LKA requirements.
6.How does Aetrix verify that MAX6707LKA is sourced from the original manufacturer or authorized distributors?
All MAX6707LKA 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 MAX6707LKA meets industry standards.
7.What is the process for return or replacement of MAX6707LKA?
All MAX6707LKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6707LKA, 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 MAX6707LKA part is unused and in its original packaging.
Return procedure for MAX6707LKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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