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Analog Devices Inc./Maxim Integrated MAX6703ARKA+T
- Part No.:
- MAX6703ARKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6703ARKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
MAX6703ARKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory circuit in 8-pin SOT23 package, monitoring three supply voltages (one fixed +3.08V VCC threshold and two adjustable via RST_IN1/RST_IN2), providing independent watchdog output (WDO), manual reset input (MR), and power-fail warning (PFI/PFO). It ensures reliable µP reset during power-up, brownout, and power-down in critical embedded systems.
For engineers reviewing the MAX6703ARKA+T datasheet, MAX6703ARKA+T pinout, MAX6703ARKA+T application, or MAX6703ARKA+T equivalent, key selection factors include its triple-voltage supervision capability, 140ms reset timeout, 1.6s watchdog period, guaranteed reset validity down to VCC = 1V, and immunity to short VCC transients - all essential for robust power monitoring in industrial and telecom equipment.
Technical Context
The MAX6703ARKA+T implements a triple-threshold supervision architecture: primary VCC reset at 3.08V (±3% over -40°C to +125°C), plus two user-adjustable thresholds (0.62V reference) on RST_IN1 and RST_IN2 for secondary/tertiary rail monitoring. Reset assertion occurs if any monitored voltage falls below its threshold.
Its watchdog timer asserts WDO low after 1.6s (typ) of no WDI edge transition, with WDO deasserting immediately upon valid WDI toggle or MR pull-low - a behavior distinguishing the "A" version from standard variants. The open-drain RESET output supports flexible pull-up configurations and interfaces directly with µP reset inputs requiring active-low assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V ±3% (T-suffix), enabling precise +3.3V rail supervision across full -40°C to +125°C range |
| Reset Timeout Period | 140ms (min), ensuring sufficient hold time for µP initialization before release |
| Watchdog Timeout | 1.6s (typ), providing deterministic fault detection window for firmware liveliness checks |
| Supply Current | 9–20µA (VCC < 3.6V), minimizing quiescent power impact in battery-backed or low-power systems |
| Operating Voltage Range | 1.0V to 5.5V, guaranteeing functional reset assertion even during deep brownout conditions |
| PFI Threshold | 0.62V (typ), allowing configurable power-fail detection on auxiliary rails via external resistor dividers |
| Reset Output Type | Active-low open-drain, supporting wired-OR configurations and level-shifting with external pull-up |
Pinout & Package
MAX6703ARKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead-free (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; pulling low forces reset and clears watchdog; used for pushbutton reset or external logic control |
| 2 VCC | Main supply and primary reset monitor input | Supplies internal circuitry and serves as reference for fixed 3.08V reset threshold; valid from 1.0V to 5.5V |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and outputs; must be low-impedance connection |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external voltage divider for custom undervoltage detection on secondary rails |
| 5 PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used to trigger early-warning interrupts or backup power switchover |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; pulses as short as 50ns are detected |
| 7 RESET | Active-low reset output | Open-drain output asserted low during VCC/RST_IN1/RST_IN2 brownout, MR activation, or watchdog timeout; requires external pull-up |
| 8 WDO | Active-low watchdog output | Independent open-drain output asserting on watchdog timeout or undervoltage condition; deasserts instantly on WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three system rails (VCC + two aux supplies) using single 0.62V internal reference and external dividers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout, preventing µP runaway before supply collapse |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, eliminating false resets in electrically noisy environments like motor drives or switching PSUs |
| Independent watchdog output (WDO) | Provides dedicated fault signaling path separate from RESET, allowing NMI-based error logging without resetting the system |
| 140ms reset timeout with temperature stability | Fixed delay remains within 120–300ms over -40°C to +125°C, ensuring consistent µP boot timing across operating conditions |
Applications
| Industrial PLC Controllers | Telecom Line Cards |
|---|---|
Use Scenario: Monitoring +3.3V I/O rail, +2.5V core rail, and +1.8V PHY rail in a carrier-grade line card with redundant power supplies. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting RESET only when all three rails exceed their thresholds, with PFO triggering graceful shutdown via FPGA interrupt upon early PFI dip. Use Value: Prevents partial initialization failures by ensuring all voltage domains are stable before µP release; 0.62V PFI reference enables accurate 1.8V rail monitoring with <1% error. |
Use Scenario: Ensuring reliable boot and runtime supervision in a 5G baseband unit where brownout resilience and watchdog liveliness are mandated by 3GPP standards. IC Role / Device Role / Timing Role: Primary µP supervisor with WDO connected to µP NMI pin for non-maskable fault reporting, while RESET controls power-on sequencing and recovery. Use Value: 1.6s watchdog timeout aligns with firmware heartbeat intervals; open-drain outputs support hot-swap compatible bus architectures with shared reset lines. |
| White Goods Main Control Boards | Critical Medical Instrumentation |
Use Scenario: Supervising main +5V MCU supply, +3.3V sensor interface rail, and +2.5V ADC reference in a smart refrigerator controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-supply monitor with -40°C to +125°C operation, using RST_IN1/RST_IN2 to track auxiliary rails while VCC tracks main supply. Use Value: 3.08V VCC threshold precisely matches +3.3V nominal rail; 140ms reset timeout exceeds typical MCU power-up requirements, eliminating need for external RC delays. |
Use Scenario: Providing fail-safe reset and watchdog coverage for a patient-monitoring device requiring IEC 62304 Class C compliance and zero-reset-failure tolerance. IC Role / Device Role / Timing Role: Safety-critical supervisor asserting RESET on any rail undervoltage, with MR enabling clinician-initiated reset and WDO feeding diagnostic log controller. Use Value: Guaranteed reset down to VCC = 1V prevents silent failure during capacitor discharge; MR glitch rejection (>100ns) eliminates spurious resets from ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703MKA+T | Fixed VCC threshold = 4.38V (M-suffix) instead of 3.08V (T-suffix); identical pinout, timing, and feature set | Suitable for +5V systems requiring higher reset threshold; not interchangeable in +3.3V designs without recalculating RST_IN dividers | Select MAX6703MKA+T only when supervising 4.5–5.5V rails; verify RST_IN1/RST_IN2 divider ratios remain valid at higher VCC |
| MAX6705ATA+T | Single-supply supervisor (VCC only), with adjustable PFI/PFO and same 3.08V VCC threshold; lacks RST_IN1/RST_IN2 pins and triple-monitoring capability | Applicable where only one rail requires supervision and power-fail warning is needed; cannot replace triple-rail monitoring function | Choose MAX6705ATA+T for cost-sensitive +3.3V-only applications with PFI/PFO requirement but no secondary rail monitoring |
Compared with MAX6703MKA+T, MAX6703ARKA+T provides tighter threshold matching for +3.3V systems; compared with MAX6705ATA+T, it delivers essential dual adjustable inputs for multi-rail validation - making it irreplaceable in designs requiring concurrent monitoring of three independent supplies.
Availability
MAX6703ARKA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, white goods main control boards, and critical medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703ARKA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was designed specifically for space-constrained, high-reliability microprocessor supervision - delivering integrated reset, watchdog, power-fail, and manual reset functions in ultra-small SOT23 packages for embedded systems with multivoltage rails.
FAQ
What is the exact VCC reset threshold voltage for MAX6703ARKA+T and its tolerance?
The MAX6703ARKA+T has a nominal VCC reset threshold of 3.08V, with a guaranteed tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This value is defined by the "T" suffix in the part number and is factory-trimmed; actual measured values fall between 2.97V and 3.17V under worst-case conditions.
Does MAX6703ARKA+T support monitoring of three independent voltage rails simultaneously?
Yes, MAX6703ARKA+T monitors three rails: the primary VCC supply (at fixed 3.08V threshold), plus two additional rails via RST_IN1 and RST_IN2 inputs. Each uses the internal 0.62V reference, allowing user-defined thresholds through external resistor dividers - enabling true triple-voltage supervision in a single 8-pin SOT23 device.
What is the watchdog timeout behavior of MAX6703ARKA+T, and how does it differ from non-A versions?
MAX6703ARKA+T features a 1.6s (typ) watchdog timeout. Unlike non-A versions, its WDO output deasserts immediately when the undervoltage condition ends - without waiting for a timeout delay - and also deasserts upon a valid WDI edge or MR pull-low. This "A" version behavior prevents latched faults during transient brownouts.
Can MAX6703ARKA+T's RESET output drive a standard CMOS µP reset input directly?
Yes, but only with an external pull-up resistor. MAX6703ARKA+T's RESET is active-low open-drain, requiring a pull-up (typically 10kΩ to VCC) to generate a valid high-level signal when deasserted. The output sinks ≥50µA at 0.3V when asserted, meeting standard µP reset input low-voltage requirements.
Is the PFI input on MAX6703ARKA+T limited to power-fail detection, or can it monitor other voltages?
The PFI input is fully general-purpose: it compares any external voltage against the internal 0.62V reference. It can monitor secondary supplies (e.g., +1.8V, +2.5V), battery voltage, or sensor outputs - not just power-fail conditions. Its 50nA max leakage current allows use with high-value resistor dividers for minimal loading.
MAX6703ARKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6703ARKA+T FAQ
1.How can I place an order for MAX6703ARKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703ARKA+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 MAX6703ARKA+T reliable?
The price and inventory of MAX6703ARKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703ARKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703ARKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703ARKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703ARKA+T?
MAX6703ARKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703ARKA+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 MAX6703ARKA+T?
For technical support, including MAX6703ARKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703ARKA+T requirements.
6.How does Aetrix verify that MAX6703ARKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703ARKA+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 MAX6703ARKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703ARKA+T?
All MAX6703ARKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703ARKA+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 MAX6703ARKA+T part is unused and in its original packaging.
Return procedure for MAX6703ARKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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