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Analog Devices Inc./Maxim Integrated MAX6705LKA+T
- Part No.:
- MAX6705LKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6705LKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:809
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Product details
Overview
MAX6705LKA+T from Maxim Integrated is a single-supply microprocessor supervisory IC in 8-pin SOT23 package, providing active-low push-pull reset output, independent watchdog timer with 1.6s timeout, adjustable 0.62V power-fail comparator (PFI/PFO), and manual reset input. It monitors +5.0V/+3.3V/+3.0V/+2.5V supplies and guarantees valid reset down to VCC = 1V for critical µP power monitoring in white goods and telecom systems.
For engineers reviewing the MAX6705LKA+T datasheet, MAX6705LKA+T pinout, MAX6705LKA+T application, or MAX6705LKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset threshold (4.63V typ), guaranteed 140ms reset timeout, and validated alternatives for industrial embedded and networking power supervision designs.
Technical Context
The MAX6705LKA+T implements a precision voltage-monitoring architecture with three independent comparators: one fixed-threshold VCC monitor (4.63V nominal), one 0.62V reference-based PFI input for power-fail warning, and internal logic that asserts RESET low on VCC brownout, MR assertion, or watchdog timeout. Its reset generator holds output low for 140–280ms after fault clearance.
Watchdog functionality operates independently of reset generation: WDI edge detection clears a 1.6s timer, and WDO asserts low on timeout or undervoltage - deasserting only on valid WDI transition or MR low (A-version behavior). The device uses BiCMOS process, supports VCC from 1.2V to 5.5V, and features 50kΩ internal MR pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (typ), ±3% over -40°C to +125°C - sets precise power-up reset point for +5V systems |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides reliable firmware activity monitoring |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection via external resistor divider |
| Supply Current | 12–25µA at VCC < 5.5V - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion down to 1V, critical for brownout recovery |
| Output Type | Active-low push-pull RESET and WDO - eliminates need for external pullup resistors |
Pinout & Package
MAX6705LKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant, lead-free (+T suffix), rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears watchdog |
| 2 VCC | Supply voltage and primary reset monitor input | Powers internal circuitry and serves as reference for 4.63V reset threshold detection |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for custom trip points |
| 5 PFO | Power-fail output | Active-low push-pull output asserted when PFI < 0.62V; used for µP interrupt or orderly shutdown signaling |
| 6 WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset 1.6s timer; pulses ≥50ns are detected |
| 7 RESET | Active-low reset output | Push-pull output asserted during VCC brownout, MR low, or watchdog timeout; holds low ≥140ms post-fault |
| 8 WDO | Active-low watchdog output | Independent push-pull output asserted on watchdog timeout or VCC/RST undervoltage; cleared by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system reset even during deep brownout conditions before full power collapse |
| Immunity to short falling VCC transients | Rejects sub-100ns supply dips, preventing false resets in noisy power environments |
| Independent PFI/PFO comparator | Enables early power-fail warning without affecting reset timing - supports predictive shutdown sequences |
| 140ms minimum reset timeout | Meets µP tRST requirements for ARM Cortex-M, PIC, and legacy 8051 families across temperature range |
| BiCMOS process technology | Delivers low leakage (<200nA at +125°C) and stable threshold drift (60ppm/°C) for long-term reliability |
Applications
| Computers | Networking |
|---|---|
Use Scenario: Desktop motherboard power sequencing with dual-rail +5V/+3.3V regulation and BIOS recovery. IC Role / Device Role / Timing Role: Primary supervisor asserting RESET on VCC brownout and generating NMI via WDO on firmware hang. Use Value: Prevents corrupted boot state by holding RESET ≥140ms while guaranteeing watchdog response within 1.6s. |
Use Scenario: Ethernet switch line card with hot-swap controller and FPGA configuration memory. IC Role / Device Role / Timing Role: Monitors +3.3V I/O rail and triggers PFO interrupt before main regulator dropout to save FPGA state. Use Value: Enables 0.62V-referenced PFI detection with 6mV hysteresis, reducing false alarms in high-noise backplane environments. |
| White Goods | Telecommunications |
Use Scenario: Smart refrigerator control board with MCU, display driver, and sensor hub. IC Role / Device Role / Timing Role: Provides fail-safe reset during AC line sags and initiates graceful shutdown via PFO-driven µP interrupt. Use Value: 1.2–5.5V operating range and 1V reset validity ensure operation during brownout recovery phases common in appliance SMPS. |
Use Scenario: Optical line terminal (OLT) with GPON MAC and real-time traffic management ASIC. IC Role / Device Role / Timing Role: Supervises +2.5V core supply and asserts RESET on undervoltage while feeding WDO to ASIC NMI pin. Use Value: 4.63V reset threshold matches +5V auxiliary rail tolerance; 1.6s watchdog enforces deterministic firmware watchdog coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA+T | 3.08V reset threshold (vs. 4.63V); identical pinout, timing, and feature set | Designed for +3.3V systems instead of +5V; requires redesign of VCC monitoring network | Select when supervising 3.3V rails - no layout change needed, but threshold mismatch invalidates direct substitution in 5V designs |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms reset timeout, no PFI/PFO comparator, no watchdog output | Lacks power-fail warning and independent watchdog signaling - suitable only for basic reset-only use cases | Choose only if PFI/PFO and WDO functions are unused; otherwise MAX6705LKA+T provides superior integration for complex supervision |
Compared with MAX6705TKA+T, MAX6705LKA+T offers higher reset threshold for +5V compatibility without sacrificing watchdog or power-fail features; versus TPS3808G33DBVR, it adds essential PFI/PFO and WDO capabilities required for telecom and white-goods safety-critical supervision.
Availability
MAX6705LKA+T is available at Aetrix Electronics and suitable for computers, networking equipment, white goods, and telecommunications infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6705LKA+T 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 industrial, automotive, and communications markets, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets microprocessor power supervision in space-constrained, high-reliability systems - delivering reset, watchdog, and power-fail functions in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of the MAX6705LKA+T?
The MAX6705LKA+T has a nominal reset threshold of 4.63V, with guaranteed min/max of 4.47V/4.78V over -40°C to +125°C. This value is fixed by the "L" suffix in the part number and applies specifically to the VCC monitor input. The device does not support adjustable reset thresholds - only PFI and (in other variants) RST_IN1/RST_IN2 are user-configurable via external dividers.
Does the MAX6705LKA+T include a watchdog timer and independent watchdog output?
Yes, the MAX6705LKA+T includes a fully functional watchdog timer with 1.6s typical timeout and an independent active-low push-pull WDO output. WDO asserts low on watchdog timeout or when VCC falls below 4.47V, and deasserts only upon valid WDI edge or MR low - matching the A-version behavior documented in the datasheet.
Can the MAX6705LKA+T monitor power-fail conditions on voltages other than VCC?
Yes, the MAX6705LKA+T supports external power-fail monitoring via its PFI pin, which compares an externally divided voltage against an internal 0.62V reference. By connecting a resistor divider from any system rail (e.g., +3.3V, +2.5V) to PFI, designers can configure early-warning detection at custom trip points - with PFO providing active-low interrupt signaling.
What is the reset timeout period of the MAX6705LKA+T, and is it adjustable?
The MAX6705LKA+T has a fixed reset timeout period of 140ms minimum and 280ms maximum over temperature. This delay is internally generated and non-adjustable - it ensures sufficient hold time for microprocessor initialization across all operating conditions without requiring external components.
Is the MAX6705LKA+T pin-compatible with other members of the MAX6701–MAX6708 family?
Yes, all MAX6701–MAX6708 devices share identical 8-pin SOT23 pinouts and footprint, including MAX6705LKA+T. However, functional differences exist: MAX6705 variants include PFI/PFO and WDO, while MAX6704/MAX6708 omit WDI/WDO or include dual RESET outputs - so pin compatibility does not imply functional interchangeability without design review.
MAX6705LKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, 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
MAX6705LKA+T FAQ
1.How can I place an order for MAX6705LKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6705LKA+T 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 MAX6705LKA+T reliable?
The price and inventory of MAX6705LKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6705LKA+T is usually 5 days.
3.What payment methods are accepted for MAX6705LKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6705LKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6705LKA+T?
MAX6705LKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6705LKA+T 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 MAX6705LKA+T?
For technical support, including MAX6705LKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6705LKA+T requirements.
6.How does Aetrix verify that MAX6705LKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6705LKA+T 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 MAX6705LKA+T meets industry standards.
7.What is the process for return or replacement of MAX6705LKA+T?
All MAX6705LKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6705LKA+T, 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 MAX6705LKA+T part is unused and in its original packaging.
Return procedure for MAX6705LKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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