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Analog Devices Inc./Maxim Integrated MAX6703AMKA+T
- Part No.:
- MAX6703AMKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703AMKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,482
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Product details
Overview
MAX6703AMKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC plus two adjustable supply rails (RST_IN1/RST_IN2), provides a 140ms reset timeout, features a 1.6s watchdog timer with independent WDO output, and includes manual reset input (MR) and power-fail detection (PFI/PFO). It is used in white goods and telecom equipment requiring reliable brownout and power-fail response.
For engineers reviewing the MAX6703AMKA+T datasheet, MAX6703AMKA+T pinout, MAX6703AMKA+T application, or MAX6703AMKA+T equivalent, this page delivers verified specifications, SOT23-8 pin mapping, triple-supply supervision logic, watchdog behavior differences between A/non-A versions, and real-world design implications for reset timing, voltage threshold selection, and PFI-based early-warning implementation.
Technical Context
The MAX6703AMKA+T implements a triple-threshold supervision architecture: one fixed VCC reset threshold (determined by suffix 'M' = 4.38V nominal), plus two user-adjustable thresholds via external resistor dividers on RST_IN1 and RST_IN2 (both referenced to 0.62V internal comparator). Its reset generator guarantees valid output down to VCC = 1V and includes immunity to short falling-VCC transients.
It integrates a 1.6s watchdog timer that asserts WDO low on timeout or undervoltage condition; unlike non-A versions, WDO deasserts immediately when all monitored supplies recover - no timeout delay required. The MR input has internal 50kΩ pullup and supports glitch rejection (100ns) and pulse-width filtering (1µs minimum).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-low open-drain - requires external pullup; enables wired-OR reset bus sharing across multiple supervisors. |
| VCC Reset Threshold | 4.38V (nominal, M-suffix) with ±30mV tolerance over -40°C to +125°C - sets primary power-good detection point for +5V or +3.3V systems. |
| Reset Timeout Period | 140ms (typical) - ensures µP remains held in reset long enough for stable clock and supply settling after power-up/brownout. |
| Watchdog Timeout | 1.6s (typical) - provides sufficient margin to detect firmware lockup without false triggers during normal interrupt latency. |
| Supply Current | 9–20µA at VCC < 3.6V - enables use in battery-backed or ultra-low-power monitoring nodes without significant quiescent load. |
| PFI Threshold | 0.62V (typical) with 6mV hysteresis - allows precise, temperature-stable power-fail warning via external resistive divider on any system rail. |
| Operating Voltage Range | 1.2V to 5.5V - supports supervision of core, I/O, and auxiliary rails across wide-input DC-DC outputs. |
Pinout & Package
MAX6703AMKA+T is housed in an 8-pin SOT23 package (JEDEC MO-178AA, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant (lead-free, +T suffix), rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with internal 50kΩ pullup; pulling low forces reset for ≥1µs and clears watchdog; debounces pushbutton switches. |
| 2 - VCC | Main supply input and primary reset monitor | Power source for internal circuitry and reference for VCC reset threshold (4.38V); must be ≥1.2V for guaranteed reset validity. |
| 3 - GND | Ground reference | Common return path for all analog comparators, digital logic, and output drivers; critical for noise immunity in multi-rail systems. |
| 4 - PFI | Power-fail input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; connects to external resistor divider for secondary/tertiary rail monitoring. |
| 5 - PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used to trigger µP interrupt (e.g., NMI) for orderly shutdown before main supply collapse. |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s timer; pulses as short as 50ns are detected; no level-hold requirement. |
| 7 - RESET | Active-low open-drain reset output | Asserts low during VCC/RST_IN1/RST_IN2 undervoltage or MR assertion; holds low for 140ms after recovery; requires external pullup resistor. |
| 8 - WDO | Active-low open-drain watchdog output | Independent of RESET; asserts low on watchdog timeout OR any undervoltage condition; deasserts immediately upon full supply recovery (A-version behavior). |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three independent supply rails (e.g., +5V, +3.3V, +1.8V) using single IC and external resistor networks. |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic reset assertion during deep brownout or battery depletion, preventing µP runaway before complete power loss. |
| 1.6s watchdog with immediate WDO deassertion (A-version) | Eliminates post-recovery delay in watchdog signaling - critical for real-time systems requiring rapid fault-clear confirmation. |
| 0.62V precision PFI threshold with 6mV hysteresis | Supports accurate, low-drift power-fail warning across temperature; enables use of high-value resistors (>1MΩ) in divider without loading error. |
| Immunity to short falling-VCC transients | Rejects sub-10µs supply dips (e.g., from switching noise or load transients), preventing spurious resets in electrically noisy environments. |
Applications
| White Goods Control | Telecom Line Card Monitoring |
|---|---|
Use Scenario: Washing machine main controller board with +5V MCU, +3.3V communication interface, and +1.2V FPGA core. IC Role / Device Role / Timing Role: MAX6703AMKA+T monitors all three rails simultaneously; asserts RESET if any drops below threshold; triggers PFO interrupt for EEPROM save before power loss. Use Value: Prevents corrupted firmware writes and inconsistent state during unstable AC line conditions common in residential power grids. |
Use Scenario: DSLAM line card with dual-supply DSP (3.3V I/O, 1.8V core) and isolated management MCU. IC Role / Device Role / Timing Role: Supervises both DSP supplies and management rail; uses WDO to signal watchdog timeout to management MCU without affecting DSP reset domain. Use Value: Enables independent fault isolation - DSP can be reset while management retains logging context, improving field diagnostics. |
| Industrial PLC Backplane | Network Router Power Management |
Use Scenario: Modular PLC base with hot-swappable I/O modules drawing +24V, +5V, and +3.3V from shared backplane. IC Role / Device Role / Timing Role: Mounted per module; RST_IN1 monitors +5V, RST_IN2 monitors +3.3V, VCC monitors local +24V-to-5V converter output. Use Value: Detects localized module-level supply faults without triggering system-wide reset, preserving operational continuity of other modules. |
Use Scenario: Multi-core router SoC with separate power domains for CPU, packet engine, and PHY interfaces. IC Role / Device Role / Timing Role: Configured to monitor CPU core (0.9V via divider), I/O (1.2V), and auxiliary (3.3V); PFO drives dedicated PMIC fault input. Use Value: Provides early power-fail warning to PMIC for controlled core voltage ramp-down, avoiding data corruption in cache and buffers. |
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 | Non-A version: WDO latches low on timeout and requires WDI edge to deassert; no automatic deassertion on supply recovery. | Less suitable for systems requiring immediate watchdog status update after transient recovery; may require additional logic to clear WDO. | Select MAX6703MKA+T only if watchdog event logging must persist until explicit firmware acknowledgment. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold), no RST_IN1/RST_IN2 inputs, no PFI/PFO, push-pull RESET only. | Lacks triple-voltage monitoring and power-fail warning capability; cannot replace MAX6703AMKA+T in multi-rail designs without redesign. | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where PFI and dual adjustable inputs are unnecessary. |
Compared with MAX6703MKA+T and TPS3808G33DBVR, the MAX6703AMKA+T uniquely combines triple-supply supervision, open-drain flexibility, and A-version's self-clearing watchdog - making it optimal for complex, multi-domain embedded systems requiring autonomous fault response without firmware intervention.
Availability
MAX6703AMKA+T is available at Aetrix Electronics and suitable for white goods control, telecom line cards, industrial PLCs, network routers, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703AMKA+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 industrial, communications, and computing applications.
The MAX6701–MAX6708 family was designed specifically for space-constrained, multi-rail microprocessor systems needing integrated reset, watchdog, power-fail warning, and manual reset - all in a tiny SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6703AMKA+T?
The MAX6703AMKA+T has a nominal VCC reset threshold of 4.38V (M-suffix), with guaranteed limits of 4.22V (min) to 4.53V (max) over the full -40°C to +125°C operating range. This threshold applies to the primary VCC supply; RST_IN1 and RST_IN2 use an internal 0.62V comparator reference, allowing user-defined trip points via external resistor dividers. The threshold is factory-trimmed and does not require calibration.
How does the A-version watchdog behavior differ in MAX6703AMKA+T versus the standard MAX6703MKA+T?
In MAX6703AMKA+T, the WDO output deasserts immediately when all monitored supplies (VCC, RST_IN1, RST_IN2) rise above their thresholds - no timeout delay is needed. In contrast, the non-A MAX6703MKA+T latches WDO low until a valid WDI edge is detected, even after supplies recover. This makes MAX6703AMKA+T ideal for applications requiring real-time watchdog status reflection without firmware polling or edge generation.
Can MAX6703AMKA+T monitor three different voltage rails simultaneously?
Yes. MAX6703AMKA+T monitors VCC directly and supports two additional rails via RST_IN1 and RST_IN2 pins, each referenced to a precise 0.62V internal comparator. By connecting resistor dividers from each rail to these pins, users can set independent reset thresholds - e.g., 3.3V (via 5.36:1 divider), 1.8V (via 1.90:1 divider), and 5.0V (VCC). Reset asserts if any of the three falls below its configured threshold.
What is the function of the PFI and PFO pins on MAX6703AMKA+T?
PFI is a high-impedance input (±200nA leakage) tied to a 0.62V internal reference; it enables power-fail warning by connecting to a resistor divider on any system rail. PFO is an open-drain active-low output that asserts when PFI voltage drops below 0.62V. Together, they form a configurable early-warning circuit - for example, triggering a µP interrupt (NMI) to save state before main supply collapse, independent of the primary reset function.
Does MAX6703AMKA+T require external components to operate?
MAX6703AMKA+T operates with minimal external components: only a pullup resistor on RESET (and optionally on WDO/PFO) is mandatory for open-drain outputs. RST_IN1 and RST_IN2 require resistor dividers only if monitoring secondary rails; PFI requires a divider only for power-fail warning. No capacitors, crystals, or trimming components are needed - enabling compact, low-BOM-cost implementations in space-constrained designs.
MAX6703AMKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 4.38V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6703AMKA+T FAQ
1.How can I place an order for MAX6703AMKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703AMKA+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 MAX6703AMKA+T reliable?
The price and inventory of MAX6703AMKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703AMKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703AMKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703AMKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703AMKA+T?
MAX6703AMKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703AMKA+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 MAX6703AMKA+T?
For technical support, including MAX6703AMKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703AMKA+T requirements.
6.How does Aetrix verify that MAX6703AMKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703AMKA+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 MAX6703AMKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703AMKA+T?
All MAX6703AMKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703AMKA+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 MAX6703AMKA+T part is unused and in its original packaging.
Return procedure for MAX6703AMKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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