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Analog Devices Inc./Maxim Integrated MAX6703LKA+
- Part No.:
- MAX6703LKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703LKA+.pdf
- Description:
- MAX6703 LOW-VOLTAGE, MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
MAX6703LKA+ from Maxim Integrated is an active-low, open-drain microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC (4.63V threshold), RST_IN1, and RST_IN2 using external resistor dividers; provides 140ms reset timeout; includes manual reset input with 50kΩ internal pullup; and features independent watchdog output (WDO) with 1.6s timeout. Used in industrial controllers requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6703LKA+ datasheet, MAX6703LKA+ pinout, MAX6703LKA+ application, or MAX6703LKA+ equivalent, this page delivers verified specifications, validated pin functions, confirmed triple-supply supervision capability, and real-world design context for µP reset integrity, watchdog fail-safe behavior, and power-fail warning integration.
Technical Context
The MAX6703LKA+ implements a dual adjustable reset input architecture supporting three independent supply rails (VCC + two user-defined thresholds via RST_IN1/RST_IN2), all feeding a single open-drain RESET output. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition and clears only on valid WDI toggle or MR assertion.
Reset generation is guaranteed down to VCC = 1V, with immunity to short falling VCC transients. The 0.62V internal reference enables precise power-fail detection at PFI, driving PFO low independently - critical for early-warning system shutdown before main supply collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 4.63V ±3%, ensuring reliable reset assertion during +5V rail brownout at typical industrial operating temperatures. |
| Reset Timeout Period | 140ms (min), guaranteeing µP remains held in reset long enough for stable clock and memory initialization. |
| Watchdog Timeout | 1.6s (typ), providing sufficient margin for firmware execution loops while detecting lockups before system fault propagation. |
| Supply Voltage Range | 1.2V to 5.5V, enabling operation across wide input conditions including post-regulator dropout scenarios. |
| RESET Output Type | Active-low open drain, allowing wired-OR configuration with other supervisors or logic-level translation via external pullup. |
| PFI Threshold | 0.62V (typ), enabling accurate power-fail detection on auxiliary rails using high-impedance resistive dividers. |
| MR Input Pullup | 50kΩ internal, eliminating need for external pullup and simplifying pushbutton reset interface design. |
Pinout & Package
MAX6703LKA+ uses an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with internal 50kΩ pullup; forces reset when pulled low; deasserts WDO in A-version. |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal circuitry and sets primary reset threshold; valid reset asserted down to 1V. |
| 3 GND | Ground Reference | System ground return path for all internal comparators, timers, and outputs; must be low-impedance for noise immunity. |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 0.62V; connects to external divider for secondary/tertiary supply monitoring. |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserting when PFI < 0.62V; used for early-warning interrupt or cascaded reset initiation. |
| 6 WDI | Watchdog Input | Edge-sensitive input; requires rising/falling transition every ≤1.6s to prevent WDO assertion; 50ns minimum pulse width supported. |
| 7 RESET | Reset Output | Active-low open-drain output; asserted during VCC/RST_IN1/RST_IN2 undervoltage, MR low, or watchdog timeout; requires external pullup. |
| 8 WDO | Watchdog Output | Independent active-low open-drain output; asserts on watchdog timeout or VCC/RST_IN1/RST_IN2 undervoltage; deasserts on WDI edge or MR low (A-version). |
Key Features
| Feature | Design Value |
|---|---|
| Dual Adjustable Reset Inputs | Enables monitoring of three distinct supply rails (VCC + RST_IN1 + RST_IN2) with externally set thresholds, supporting multivoltage µP systems without additional comparators. |
| Independent Watchdog Output | WDO operates separately from RESET, allowing NMI-based fault logging or independent safety channel activation without interfering with main reset state. |
| 0.62V Precision Reference | Stable internal reference enables accurate power-fail detection on any rail (e.g., 3.3V, 2.5V, 1.8V) using simple resistor dividers with minimal component count. |
| Guaranteed Reset Valid to VCC = 1V | Ensures deterministic reset behavior during deep brownout or battery sag, preventing µP runaway before full power loss. |
| Immunity to Short Falling VCC Transients | Rejects sub-100ns supply dips, avoiding spurious resets in electrically noisy environments such as motor drives or switching power supplies. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 5V main logic supply, 3.3V I/O rail, and 2.5V sensor interface rail in a programmable logic controller exposed to 12V battery fluctuations. IC Role / Device Role / Timing Role: Triple-voltage supervisor generating unified open-drain RESET signal and independent WDO for watchdog-triggered diagnostics. Use Value: Prevents erratic program execution during engine cranking-induced voltage sags by holding µP in reset until all rails stabilize above their respective thresholds. | Use Scenario: Power supervision in a BCM managing door locks, lighting, and window controls powered from vehicle battery and local LDOs. IC Role / Device Role / Timing Role: Primary reset generator with PFI-connected divider on 5V LDO output to warn of impending power loss before CAN bus shutdown. Use Value: Enables orderly EEPROM save and CAN message flush via PFO-triggered µP interrupt prior to complete system power collapse. |
| Medical Infusion Pump | Network Edge Router |
Use Scenario: Safety-critical reset management for ARM Cortex-M4 µP controlling motor drivers and pressure sensors, powered from isolated DC-DC converters. IC Role / Device Role / Timing Role: Triple-supply monitor (VCC, isolated 3.3V, analog 5V) with manual reset for service mode and watchdog for firmware hang detection. Use Value: Guarantees fail-safe shutdown on any rail undervoltage, meeting IEC 62304 Class C software safety requirements through hardware-enforced reset integrity. | Use Scenario: Supervising 12V input, 5V intermediate, and 3.3V core rails in a fanless edge router operating in uncontrolled ambient temperatures. IC Role / Device Role / Timing Role: Open-drain RESET output wired-OR'd with other supervisors; WDO connected to FPGA configuration watchdog input. Use Value: Eliminates need for discrete reset ICs per rail, reducing BOM count and PCB area while maintaining independent fault detection per domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA+ | 3.08V VCC reset threshold vs. 4.63V; identical pinout, timing, and feature set. | Suitable for +3.3V systems instead of +5V; same triple-monitoring capability and open-drain RESET. | Select MAX6703TKA+ when primary supply is 3.3V and brownout detection must occur near nominal rail voltage. |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold), no RST_IN1/RST_IN2 inputs, no PFI/PFO, push-pull RESET output. | Lacks triple-voltage monitoring and power-fail warning; suited for simpler single-rail applications. | Choose TPS3808G33DBVR only if system uses one regulated supply and does not require auxiliary rail supervision or early power-fail signaling. |
Compared with MAX6703TKA+, the MAX6703LKA+ provides higher reset threshold for robust +5V rail supervision; compared with TPS3808G33DBVR, it delivers triple-supply monitoring, independent power-fail detection, and open-drain flexibility-critical for complex multirail embedded designs.
Availability
MAX6703LKA+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical infusion pumps, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703LKA+ 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, communications, and computing markets, with emphasis on reliability and integration.
The MAX6701–MAX6708 family targets cost-sensitive, space-constrained microprocessor systems needing multivoltage supervision, watchdog safety, and power-fail warning in a single 8-pin SOT23 package.
FAQ
What is the reset threshold voltage for MAX6703LKA+?
The MAX6703LKA+ has a fixed VCC reset threshold of 4.63V (±3%) over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC falling)". It ensures reliable reset assertion during brownout conditions on standard +5V logic rails.
Does MAX6703LKA+ support monitoring of multiple supply voltages?
Yes, MAX6703LKA+ supports triple-voltage monitoring: the primary VCC rail (4.63V threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins. Each uses the internal 0.62V reference with external resistor dividers to set custom thresholds - enabling supervision of 3.3V, 2.5V, or other system rails simultaneously.
What type of RESET output does MAX6703LKA+ provide?
MAX6703LKA+ provides an active-low open-drain RESET output. It requires an external pullup resistor to the appropriate logic rail. This configuration allows wired-OR connection with other supervisors or level-shifting, and avoids contention in multi-source reset architectures.
How does the watchdog function work in MAX6703LKA+?
The MAX6703LKA+ watchdog timer asserts the independent WDO output low if the WDI input is not toggled within 1.6s. WDO deasserts on a valid WDI edge or when MR is pulled low (A-version). Unlike RESET, WDO is not affected by VCC reset timeout timing - enabling separate fault signaling paths.
Can MAX6703LKA+ generate a power-fail warning before main supply collapse?
Yes, MAX6703LKA+ includes a dedicated PFI input and PFO output. By connecting PFI to a resistor divider on a monitored rail, the device detects voltage drops below 0.62V and asserts PFO low - providing early warning for µP-initiated graceful shutdown, data save, or status logging before full power loss occurs.
MAX6703LKA+ 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:
- 3
- Voltage - Threshold:
- 4.63V, Adj, Adj
- 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
MAX6703LKA+ FAQ
1.How can I place an order for MAX6703LKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703LKA+ 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 MAX6703LKA+ reliable?
The price and inventory of MAX6703LKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703LKA+ is usually 5 days.
3.What payment methods are accepted for MAX6703LKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703LKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703LKA+?
MAX6703LKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703LKA+ 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 MAX6703LKA+?
For technical support, including MAX6703LKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703LKA+ requirements.
6.How does Aetrix verify that MAX6703LKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6703LKA+ 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 MAX6703LKA+ meets industry standards.
7.What is the process for return or replacement of MAX6703LKA+?
All MAX6703LKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703LKA+, 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 MAX6703LKA+ part is unused and in its original packaging.
Return procedure for MAX6703LKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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