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Analog Devices Inc./Maxim Integrated MAX6702LKA+T
- Part No.:
- MAX6702LKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6702LKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MAX6702LKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit in 8-pin SOT23 package, monitoring +5.0V supply with 4.63V reset threshold, providing 140ms reset timeout, 1.6s watchdog timer, and independent power-fail warning via PFI/PFO. It ensures reliable µP reset during power-up, brownout, and power-down in embedded controllers and intelligent instruments.
For engineers reviewing the MAX6702LKA+T datasheet, MAX6702LKA+T pinout, MAX6702LKA+T application, or MAX6702LKA+T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases for critical µP power monitoring, and validated alternative options for voltage supervision in industrial and telecom systems.
Technical Context
The MAX6702LKA+T implements a dual-stage reset generator with guaranteed reset assertion down to VCC = 1V and immunity to short falling-VCC transients. Its internal 0.62V reference enables precise external voltage monitoring via PFI and supports manual reset (MR) with 50kΩ internal pullup and 200ns MR-to-reset delay.
This device integrates a 1.6s watchdog timer with independent WDO output that asserts low on timeout or undervoltage conditions, and deasserts immediately upon valid WDI edge-distinct from latch-only behavior of non-A versions. The active-high RESET output complements standard active-low variants for direct interface with µP reset inputs requiring high-true logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (typ), ±30mV tolerance over -40°C to +125°C - sets precise +5V supply monitoring point |
| Reset Timeout Period | 140ms (min), 280ms (max) - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s (typ), 0.96–2.52s over temperature - provides robust firmware activity monitoring without false triggers |
| Supply Voltage Range | 1.2V to 5.5V - guarantees operation during brownout down to 1.2V while maintaining reset validity |
| Power-Fail Threshold | 0.62V (typ) at PFI input - enables accurate early-warning detection of secondary supply collapse via external resistor divider |
| Output Type | Active-high push-pull RESET - eliminates need for external pullup and drives µP reset pin directly with rail-to-rail logic levels |
| Quiescent Current | 12–25µA (typ) - enables ultra-low-power supervision in battery-backed or energy-constrained systems |
Pinout & Package
MAX6702LKA+T uses an 8-pin SOT23 package (package code K8+2, outline 21-0078), with 0.65mm lead pitch and RoHS-compliant lead-free construction (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces immediate active-high RESET assertion for 140ms |
| 2 VCC | Supply voltage input | Primary power source for internal circuitry and reset threshold comparator; powers push-pull outputs |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 PFI | Power-fail monitor input | High-impedance (±200nA leakage) input referenced to 0.62V internal bandgap; used to detect auxiliary supply collapse |
| 5 PFO | Power-fail monitor 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 clears watchdog timer; pulses as short as 50ns are detected |
| 7 RESET | Active-high reset output | Push-pull output driving high (≥0.8×VCC) when asserted; guaranteed valid down to VCC = 1V |
| 8 WDO | Active-low watchdog output | Push-pull output asserting low on watchdog timeout or VCC/RST_IN undervoltage; deasserts immediately on valid WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates external pullup resistor and reduces BOM count; compatible with µPs requiring high-true reset assertion |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset state during deep brownout, preventing µP runaway before full power loss |
| Independent PFI/PFO comparator | Enables early warning of secondary supply failure (e.g., I/O or analog rails) without affecting primary VCC supervision |
| 1.6s watchdog with immediate WDO deassertion | Supports responsive firmware recovery: WDO goes high within nanoseconds of WDI toggle, not after timeout delay |
| Immunity to short falling-VCC transients | Rejects sub-µs supply dips (e.g., from switching noise), preventing spurious resets in electrically noisy environments |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
Use Scenario: Programmable logic controller (PLC) module operating in factory automation with fluctuating 24VDC-derived +5V rail. IC Role / Device Role / Timing Role: Supervises +5V supply and triggers active-high RESET to hold ARM Cortex-M4 core in known state during brownout. Use Value: Prevents corrupted register writes or flash programming during voltage sag by guaranteeing 140ms minimum reset pulse even as VCC drops to 1.2V. |
Use Scenario: Line card in carrier-grade Ethernet switch requiring graceful shutdown before backup battery depletion. IC Role / Device Role / Timing Role: Monitors +3.3V I/O supply via PFI and asserts PFO to initiate controlled data flush and power sequencing. Use Value: Uses 0.62V internal reference to detect 3.3V rail collapse at ~2.9V (via 100kΩ/470kΩ divider), enabling >100ms warning before hard reset. |
| Intelligent Instrumentation | Critical µP Power Monitoring |
Use Scenario: Portable handheld multimeter with dual-supply architecture (core + analog front-end). IC Role / Device Role / Timing Role: Provides watchdog supervision of firmware execution and manual reset via front-panel button. Use Value: WDI toggled by main loop every 800ms ensures watchdog timeout only occurs on true lockup-not transient delays-reducing false resets by >95%. |
Use Scenario: Medical diagnostic device where µP reset integrity is safety-critical per IEC 62304. IC Role / Device Role / Timing Role: Primary supervisor for +5V system rail with redundant MR input tied to emergency stop circuit. Use Value: MR input's 100ns glitch rejection and 200ns propagation delay ensure E-stop commands override all other reset sources without race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6702LKA-T | Same functionality and pinout but leaded (Pb-containing) packaging; identical electrical specs and timing | No difference in circuit design or layout; only differs in RoHS compliance status | Select MAX6702LKA-T only if leaded assembly process is mandated and RoHS exemption applies |
| MAX6706LKA+T | Identical 4.63V threshold and active-high RESET, but includes dual adjustable reset inputs (RST_IN1/RST_IN2) for triple-voltage monitoring | Supports monitoring of +5V, +3.3V, and +2.5V rails simultaneously-adds two external resistors vs. MAX6702LKA+T's single-rail focus | Choose MAX6706LKA+T when supervising multiple supply domains; otherwise MAX6702LKA+T minimizes BOM and layout complexity |
Compared with MAX6702LKA+T, MAX6702LKA-T requires no PCB changes but lacks RoHS compliance, while MAX6706LKA+T adds triple-supply capability at the cost of two extra external resistors and slightly higher quiescent current-making MAX6702LKA+T optimal for single-rail +5V systems prioritizing simplicity and regulatory alignment.
Availability
MAX6702LKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, intelligent instrumentation, and critical µP power monitoring requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6702LKA+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.
The MAX6701–MAX6708 family was engineered specifically for reliable, low-component-count microprocessor supervision in space-constrained embedded systems requiring multi-voltage monitoring, watchdog safety, and power-fail warning.
FAQ
What is the reset threshold voltage of the MAX6702LKA+T?
The MAX6702LKA+T has a nominal reset threshold of 4.63V, with guaranteed limits of 4.47V (min) to 4.78V (max) over the full -40°C to +125°C operating temperature range. This value is fixed by the "L" suffix in the part number and is optimized for precise supervision of +5.0V supply rails in industrial and telecom equipment.
Does the MAX6702LKA+T provide an active-high or active-low reset output?
The MAX6702LKA+T provides an active-high push-pull RESET output, as confirmed by its "2" position in the MAX670x family designation and the functional diagram in the datasheet. This means RESET goes high (≥0.8×VCC) when asserted, eliminating the need for an external pullup resistor and simplifying interface with µPs requiring high-true reset signals.
Can the MAX6702LKA+T monitor voltages other than VCC?
Yes, the MAX6702LKA+T can monitor auxiliary voltages using its PFI input, which references an internal 0.62V bandgap. By connecting a resistor divider from the target supply to PFI, designers can configure early-warning detection-for example, detecting a drop in a +3.3V rail at ~2.9V. The corresponding PFO output then asserts low to signal the condition.
What is the watchdog timeout period for the MAX6702LKA+T?
The MAX6702LKA+T features a watchdog timeout period of 1.6s (typical), with guaranteed range of 0.96s to 2.52s across -40°C to +125°C. The watchdog timer clears on any rising or falling edge at WDI, and WDO deasserts immediately upon valid transition-enabling fast firmware recovery without waiting for timeout expiration.
Is the MAX6702LKA+T pin-compatible with other devices in the MAX670x family?
Yes, the MAX6702LKA+T shares identical 8-pin SOT23 pinout and footprint with all MAX6701–MAX6708 variants, including MAX6702A, MAX6706, and MAX6708. However, function mapping differs: e.g., pin 8 is WDO on MAX6702LKA+T but N.C. on MAX6708, so schematic and firmware integration must match the specific variant's functional configuration.
MAX6702LKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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 High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6702LKA+T FAQ
1.How can I place an order for MAX6702LKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6702LKA+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 MAX6702LKA+T reliable?
The price and inventory of MAX6702LKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6702LKA+T is usually 5 days.
3.What payment methods are accepted for MAX6702LKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6702LKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6702LKA+T?
MAX6702LKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6702LKA+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 MAX6702LKA+T?
For technical support, including MAX6702LKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6702LKA+T requirements.
6.How does Aetrix verify that MAX6702LKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6702LKA+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 MAX6702LKA+T meets industry standards.
7.What is the process for return or replacement of MAX6702LKA+T?
All MAX6702LKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6702LKA+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 MAX6702LKA+T part is unused and in its original packaging.
Return procedure for MAX6702LKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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