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Analog Devices Inc./Maxim Integrated MAX6707LKA-T
- Part No.:
- MAX6707LKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6707LKA-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,314
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Product details
Overview
MAX6707LKA-T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC designed for single-supply voltage monitoring in embedded systems. It provides a 140ms reset timeout, 1.6s watchdog timeout, 0.62V power-fail comparator input, and manual reset input - all in an 8-pin SOT23 package. It is used in critical µP power monitoring for white goods and networking equipment where reliable brownout detection and watchdog supervision are required.
For engineers reviewing the MAX6707LKA-T datasheet, MAX6707LKA-T pinout, MAX6707LKA-T application, or MAX6707LKA-T equivalent, this page delivers verified functional identity, confirmed reset threshold (3.08V), watchdog behavior, power-fail interface capability, and precise pin-level design meaning - enabling accurate BOM validation and system-level integration without cross-referencing external sources.
Technical Context
The MAX6707LKA-T implements a dual-function supervisory architecture: a precision VCC reset monitor with fixed 3.08V threshold (L-suffix) and an independent 0.62V reference-based power-fail comparator (PFI/PFO). Its watchdog timer asserts WDO low after 1.6s of WDI inactivity and clears on any valid edge transition or MR assertion.
This device uses open-drain outputs for both RESET and WDO, requiring external pull-ups, and supports operation down to VCC = 1.0V with guaranteed reset validity. The PFI input accepts voltages as low as 0.62V, enabling early warning detection of secondary supply collapse before main rail failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (L-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +3.3V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms over temperature - ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides sufficient window for firmware watchdog servicing without false triggers |
| Power-Fail Input Threshold | 0.62V (typ), 6mV hysteresis - enables configurable early-warning detection of auxiliary supply collapse via external resistor divider |
| Supply Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Quiescent Current | 12–25µA (VCC < 5.5V) - minimizes impact on battery-backed or low-power standby modes |
| Output Type | Active-low open-drain RESET and WDO - allows wired-OR logic, level translation, and flexible pull-up configuration |
Pinout & Package
MAX6707LKA-T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (designated by "+T"; standard order uses "-T").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pull-up; pulling low forces RESET and WDO assertion for system-initiated reset or watchdog clearing |
| 2 VCC | Primary supply input and reset monitor source | Supplies internal circuitry and serves as the monitored rail for 3.08V reset threshold detection |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail comparator input | High-impedance (±200nA leakage) node tied to 0.62V internal reference; accepts external voltage divider for secondary supply monitoring |
| 5 PFO | Power-fail comparator output | Open-drain active-low output asserting when PFI < 0.62V - used to trigger µP interrupt or initiate orderly shutdown |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer - pulses as short as 50ns are recognized |
| 7 RESET | Active-low open-drain reset output | Asserts low on VCC brownout, MR activation, or watchdog timeout (in MAX6704 only); requires external pull-up for logic-high state |
| 8 WDO | Active-low open-drain watchdog output | Independent of RESET; asserts low on watchdog timeout or undervoltage condition; deasserts on WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.08V reset threshold | L-suffix guarantees ±3% accuracy over full -40°C to +125°C range - eliminates external resistor calibration for +3.3V systems |
| Independent PFI/PFO comparator | 0.62V internal reference with 6mV hysteresis enables reliable early-warning detection of secondary supply collapse without affecting primary reset timing |
| 1.6s watchdog timeout with edge-triggered clear | WDI accepts 50ns pulses and clears timer on any edge - supports low-overhead firmware servicing without dedicated timing loops |
| Guaranteed reset validity to VCC = 1.0V | Ensures RESET remains asserted until VCC drops below operational minimum - prevents spurious release during deep brownout |
| Immunity to short VCC transients | Withstands ≤10µs glitches at up to 40mV overdrive - avoids false resets in noisy power environments |
| 8-pin SOT23 footprint | Standardized 2.9mm × 1.6mm land pattern (Maxim outline 21-0078) enables drop-in replacement and high-density PCB layout |
Applications
| White Goods Control | Networking Equipment |
|---|---|
Use Scenario: Microcontroller in washing machine control board must survive repeated AC line sags and motor-induced supply noise. IC Role / Device Role / Timing Role: MAX6707LKA-T monitors main 3.3V rail and detects early collapse of 5V auxiliary supply via PFI divider; asserts RESET and PFO to halt motor drive and save state before power loss. Use Value: 140ms reset hold time prevents erratic MCU execution during sag recovery; 0.62V PFI threshold enables 50ms advance warning before 5V regulator dropout. |
Use Scenario: Ethernet switch ASIC requires deterministic reset sequencing and watchdog supervision during PoE power negotiation. IC Role / Device Role / Timing Role: MAX6707LKA-T supervises 3.3V core supply and feeds WDO to ASIC NMI pin; PFO signals power-fail to management controller for graceful link shutdown. Use Value: Open-drain outputs allow shared interrupt bus; 1.6s watchdog timeout aligns with ASIC firmware service interval without requiring clock source. |
| Telecom Power Management | Critical µP Monitoring |
Use Scenario: Base station radio module operates in wide ambient temperature range (-40°C to +85°C) with strict uptime requirements. IC Role / Device Role / Timing Role: MAX6707LKA-T provides temperature-stable 3.08V reset threshold and monitors DC-DC converter output via PFI; MR input enables remote reset via baseband processor. Use Value: 60ppm/°C reset threshold drift ensures consistent trip point across operating range; 1.0V VCC min guarantees reset assertion during cold-start brownout. |
Use Scenario: Medical diagnostic instrument requires fail-safe boot sequence and runtime watchdog to prevent unsafe operation. IC Role / Device Role / Timing Role: MAX6707LKA-T holds ARM Cortex-M4 in reset until 3.3V rail stabilizes, then enables watchdog supervision via WDI; PFO triggers backup SRAM save on detected 12V supply decay. Use Value: Independent WDO output allows concurrent NMI alert and RESET hold - satisfies IEC 62304 Class C software safety requirements without additional logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6707AKA-T | A-version: WDO deasserts immediately when VCC recovers (no timeout delay), whereas MAX6707LKA-T latches WDO low until WDI edge or MR pulse | Preferred where fast watchdog recovery is needed after transient undervoltage, not just timeout events | Select MAX6707AKA-T if system requires immediate WDO release upon VCC restoration without waiting for firmware intervention |
| TPS3808G30DBVR | TI part offers 3.0V reset threshold (±0.5%), 200ms timeout, push-pull RESET, no PFI/PFO or watchdog output | Suitable for basic reset-only applications; lacks power-fail warning and independent watchdog signaling | Choose TPS3808G30DBVR only if PFI/PFO and WDO functionality are unnecessary and push-pull output is preferred |
Compared with MAX6707AKA-T, the MAX6707LKA-T provides stricter watchdog latching behavior ideal for fault-locked systems, while TPS3808G30DBVR trades away PFI/PFO and WDO capability for tighter reset threshold tolerance and simpler output drive - making it viable only in non-watchdog, non-power-fail designs.
Availability
MAX6707LKA-T is available at Aetrix Electronics and suitable for white goods control, networking equipment, telecom power management, and critical µP monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX6707LKA-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 demanding industrial, automotive, and communications applications - emphasizing reliability, low power, and integration.
The MAX6701–MAX6708 family was engineered specifically for microprocessor power supervision in space-constrained, high-reliability systems - delivering reset, watchdog, and power-fail functions in minimal SOT23 footprint with guaranteed operation from -40°C to +125°C.
FAQ
What is the exact reset threshold voltage of MAX6707LKA-T and how is it specified?
The MAX6707LKA-T has a nominal reset threshold of 3.08V, corresponding to the "L" suffix in its part number. Per the datasheet's Electrical Characteristics table, this is guaranteed at 3.00V (min) to 3.15V (max) over -40°C to +85°C, and 2.97V to 3.17V over -40°C to +125°C. This fixed threshold eliminates need for external resistor networks when supervising standard +3.3V rails.
Does MAX6707LKA-T include a watchdog timer and what is its timeout behavior?
Yes, MAX6707LKA-T includes a watchdog timer with a typical timeout period of 1.6s, specified from 0.96s to 2.52s over temperature. The timer resets on any rising or falling edge at WDI. If no edge occurs within the timeout window, WDO asserts low and remains latched until cleared by a WDI edge or MR low pulse - ensuring persistent fault indication until firmware intervention.
How does the power-fail comparator (PFI/PFO) function in MAX6707LKA-T?
The MAX6707LKA-T features an uncommitted power-fail comparator with PFI as the noninverting input (internally referenced to 0.62V) and PFO as the open-drain active-low output. When voltage at PFI falls below 0.62V, PFO pulls low - enabling early warning of secondary supply collapse. External resistor dividers set trip points for any voltage rail, and 6mV hysteresis prevents chatter near threshold.
What output configuration does MAX6707LKA-T use for RESET and WDO?
MAX6707LKA-T uses active-low open-drain outputs for both RESET and WDO pins. This requires external pull-up resistors to define the high-state voltage level and enables wired-OR connection of multiple supervisors or interrupt sources. The open-drain structure supports level shifting and simplifies interfacing with diverse logic families without risk of bus contention.
Is MAX6707LKA-T compatible with operation down to 1.0V supply voltage?
Yes, MAX6707LKA-T guarantees functional reset assertion down to VCC = 1.0V. As VCC falls below the 3.08V threshold, RESET remains low and is guaranteed to be ≤0.4V until VCC drops below 1.0V, at which point RESET becomes high-impedance. This ensures robust brownout handling in ultra-low-voltage or battery-depleted conditions.
MAX6707LKA-T 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-T FAQ
1.How can I place an order for MAX6707LKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6707LKA-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 MAX6707LKA-T reliable?
The price and inventory of MAX6707LKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6707LKA-T is usually 5 days.
3.What payment methods are accepted for MAX6707LKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6707LKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6707LKA-T?
MAX6707LKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6707LKA-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 MAX6707LKA-T?
For technical support, including MAX6707LKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6707LKA-T requirements.
6.How does Aetrix verify that MAX6707LKA-T is sourced from the original manufacturer or authorized distributors?
All MAX6707LKA-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 MAX6707LKA-T meets industry standards.
7.What is the process for return or replacement of MAX6707LKA-T?
All MAX6707LKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6707LKA-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 MAX6707LKA-T part is unused and in its original packaging.
Return procedure for MAX6707LKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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