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Analog Devices Inc./Maxim Integrated MAX6703SKA
- Part No.:
- MAX6703SKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703SKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
MAX6703SKA from Maxim Integrated is an 8-pin SOT23 microprocessor supervisory circuit with triple-voltage monitoring (one fixed + one dual adjustable), active-low open-drain reset output, manual reset input, and independent watchdog timer with 1.6s timeout. It guarantees valid reset down to VCC = 1V and features a 0.62V power-fail comparator input for early warning in industrial controllers and embedded systems.
For engineers reviewing the MAX6703SKA datasheet, MAX6703SKA pinout, MAX6703SKA application, or MAX6703SKA equivalent, this device supports precise multi-rail supervision in space-constrained designs requiring brownout protection, watchdog fault recovery, and power-fail interrupt signaling without external components.
Technical Context
The MAX6703SKA implements three independent voltage monitors: VCC (fixed threshold per suffix 'S' = 2.93V), RST_IN1, and RST_IN2 - each referenced to an internal 0.62V comparator. Reset assertion occurs if any monitored rail falls below its threshold, holding RESET low for 140ms minimum after recovery.
Its watchdog circuit asserts WDO low upon 1.6s WDI inactivity and deasserts only on valid WDI edge or MR low pulse (A-version behavior). The PFI/PFO comparator operates independently, enabling system-level power-fail warning with sub-1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.93V (±3%, -40°C to +125°C), fixed for suffix 'S'; enables reliable +3.3V rail supervision |
| Reset Timeout Period | 140ms min, 300ms max; ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s typ (0.96–2.52s over temp); provides deterministic fault detection window |
| Power-Fail Threshold | 0.62V typ at PFI pin; allows adjustable trip point via external resistor divider |
| Supply Current | 9µA typ at VCC = 3.3V; supports ultra-low-power battery-backed systems |
| Operating Voltage Range | 1.2V to 5.5V; guarantees reset validity down to VCC = 1V for deep brownout immunity |
| Output Type | Active-low open-drain RESET and WDO; enables wired-OR configuration and level shifting |
Pinout & Package
Package: 8-pin SOT23-8, lead-free (RoHS-compliant), 2.8mm × 2.9mm footprint, 1.45mm height.
| 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 |
| 2 VCC | Supply Voltage Input | Primary power rail input and reference for main reset monitor; powers push-pull outputs |
| 3 GND | Ground Reference | Common return path for all internal comparators, timers, and output drivers |
| 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 | Open-drain active-low output asserted when PFI < 0.62V; used for µP interrupt signaling |
| 6 N.C. | No Connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
| 7 RESET | Reset Output | Active-low open-drain output; asserted during power-up, brownout, or MR activation |
| 8 WDO | Watchdog Output | Independent active-low open-drain output; latched low on watchdog timeout or undervoltage |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of two auxiliary rails (e.g., I/O and core) using single 0.62V reference |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout, preventing µP latch-up |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC, eliminating false resets in noisy power environments |
| 140ms reset timeout with temperature stability | Minimizes startup delay while maintaining ±20% tolerance across -40°C to +125°C |
| Low 9µA supply current at 3.3V | Reduces quiescent load on backup supplies in always-on monitoring applications |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors +3.3V I/O rail, +2.5V sensor interface rail, and +5.0V actuator rail in a distributed control unit. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting unified reset and generating PFO interrupt prior to main rail collapse. Use Value: Prevents partial execution during multi-rail brownout by holding µP in reset until all rails stabilize above thresholds. |
Use Scenario: Supervises battery-backed +3.3V microcontroller supply and 12V-to-5V converter output in door module ECU. IC Role / Device Role / Timing Role: Primary reset generator with watchdog oversight and early PFI-based warning before ignition-off voltage decay. Use Value: Enables graceful firmware shutdown and EEPROM save before VCC drops below 2.93V threshold. |
| Network Router Management Card | Medical Diagnostic Handheld |
|
Use Scenario: Ensures clean boot of ARM-based management processor under variable PoE-derived +3.3V and +5.0V supplies. IC Role / Device Role / Timing Role: Dual-supply monitor with independent WDO feeding NMI line and RESET controlling power sequencing logic. Use Value: Detects software hangs via WDI timeout and triggers controlled reboot without affecting main data plane. |
Use Scenario: Provides fail-safe reset for low-power Cortex-M0+ controller operating from Li-ion battery with buck-boost regulator. IC Role / Device Role / Timing Role: Brownout protector with PFI connected to battery voltage divider and MR tied to emergency shutdown switch. Use Value: Guarantees safe state entry before battery reaches critical 2.9V cutoff, meeting IEC 62304 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA | Fixed 3.08V VCC reset threshold (vs. 2.93V); identical pinout, timing, and feature set | Suitable where +3.3V rail tolerance requires higher trip point to avoid nuisance resets | Select MAX6703TKA when system VCC nominal is 3.3V ±3% and margin against 2.93V threshold is insufficient |
| MAX6705SKA | Single-supply monitor (VCC only), no RST_IN1/RST_IN2; retains PFI/PFO, WDO, MR, and same 2.93V threshold | Used when only main rail supervision is needed, reducing BOM count and PCB area | Choose MAX6705SKA for cost-sensitive designs requiring only primary rail monitoring and power-fail warning |
Compared with MAX6703SKA, MAX6703TKA offers tighter margin for +3.3V systems near upper tolerance limit, while MAX6705SKA simplifies design by removing dual adjustable inputs-both retain full watchdog, manual reset, and PFI/PFO functionality in identical SOT23-8 packaging.
Availability
MAX6703SKA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, network router management cards, and medical diagnostic handhelds requiring stable component supply across extended temperature ranges.
Supply support for MAX6703SKA 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 MAX670x family delivers compact, low-power microprocessor supervisors with integrated watchdog, power-fail detection, and multi-rail monitoring for space-constrained embedded systems.
FAQ
What is the reset threshold voltage for MAX6703SKA?
The MAX6703SKA has a fixed VCC reset threshold of 2.93V (±3%) over -40°C to +125°C, defined by the 'S' suffix per Maxim's Threshold Suffix Guide. This value is guaranteed across temperature and supply voltage variations, enabling robust supervision of +3.3V rails with adequate noise margin.
Does MAX6703SKA support triple-voltage monitoring?
Yes, MAX6703SKA supports triple-voltage monitoring: VCC (2.93V fixed), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins. Each uses the internal 0.62V reference with external resistor dividers, allowing independent trip points for auxiliary supplies like I/O or sensor rails.
What is the watchdog timeout period for MAX6703SKA?
The MAX6703SKA watchdog timeout period is 1.6s typical (0.96s to 2.52s over -40°C to +125°C). It triggers WDO assertion if the WDI input remains static beyond this window, and WDO deasserts only upon valid WDI edge or MR low pulse - consistent with A-version behavior.
Is MAX6703SKA compatible with open-drain reset configurations?
Yes, MAX6703SKA features an active-low open-drain RESET output (per Selector Guide), enabling direct connection to wired-OR bus architectures and level-shifting interfaces. External pullup is required; typical values range from 4.7kΩ to 10kΩ depending on sink current and rise time requirements.
How does the power-fail comparator function in MAX6703SKA?
The MAX6703SKA's PFI pin connects to an internal 0.62V comparator, allowing custom trip points via external resistor dividers. When PFI voltage drops below 0.62V, PFO asserts low within 1µs, providing early warning before main rail collapse - commonly used to trigger µP interrupts for orderly shutdown.
MAX6703SKA 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:
- 2.93V, 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
MAX6703SKA FAQ
1.How can I place an order for MAX6703SKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703SKA 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 MAX6703SKA reliable?
The price and inventory of MAX6703SKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703SKA is usually 5 days.
3.What payment methods are accepted for MAX6703SKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703SKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703SKA?
MAX6703SKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703SKA 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 MAX6703SKA?
For technical support, including MAX6703SKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703SKA requirements.
6.How does Aetrix verify that MAX6703SKA is sourced from the original manufacturer or authorized distributors?
All MAX6703SKA 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 MAX6703SKA meets industry standards.
7.What is the process for return or replacement of MAX6703SKA?
All MAX6703SKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703SKA, 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 MAX6703SKA part is unused and in its original packaging.
Return procedure for MAX6703SKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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