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Analog Devices Inc./Maxim Integrated MAX6703TKA
- Part No.:
- MAX6703TKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703TKA.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
MAX6703TKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing triple-voltage monitoring (one fixed + two adjustable thresholds), 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 supports critical power-monitoring applications in automotive and industrial controllers.
For engineers reviewing the MAX6703TKA datasheet, MAX6703TKA pinout, MAX6703TKA application, or MAX6703TKA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset threshold behavior, watchdog timing constraints, and validated alternative options for µP supervision in multivoltage embedded systems.
Technical Context
The MAX6703TKA implements a dual-adjustable-reset-input architecture enabling precise monitoring of three system supply rails (e.g., VCC, I/O, core) via external resistor dividers referenced to its internal 0.62V comparator threshold. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition and clears only on reset release or MR assertion.
Reset generation uses a guaranteed 140ms timeout delay following VCC, RST_IN1, or RST_IN2 crossing below their respective thresholds. The open-drain RESET output supports flexible pull-up configurations, while PFI/PFO provide independent power-fail warning with 1µs propagation delay and 6mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Active-low open-drain - enables wired-OR reset bus and level-shifting compatibility across voltage domains. |
| VCC Reset Threshold | 3.08V (T-suffix) - factory-trimmed precision threshold for primary supply monitoring at -40°C to +125°C. |
| Watchdog Timeout | 1.6s typical - ensures µP firmware liveness detection without requiring clock source or external timing components. |
| Reset Timeout Period | 140ms minimum - holds reset asserted long enough to guarantee full µP initialization and memory stabilization. |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during brownout and enables supervision of modern low-voltage logic rails. |
| Power-Fail Threshold | 0.62V ±9mV - stable reference for configuring early-warning PFI inputs down to 2.1V system supplies. |
| Manual Reset Pulse Width | ≥1µs - compatible with mechanical pushbutton debouncing and digital logic assertion without external filtering. |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 BA), 3.00mm × 1.75mm × 1.30mm body, lead-free option available as MAX6703TKA+T.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; deasserts WDO in A-version. |
| 2 - VCC | Main supply input | Primary power rail monitored for reset; powers internal comparators and outputs; valid down to 1.2V. |
| 3 - GND | Ground reference | Common return path for all internal circuits and output drivers; must be low-impedance for noise immunity. |
| 4 - PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external resistive divider for secondary supply monitoring. |
| 5 - PFO | Power-fail output | Open-drain active-low output asserting when PFI < 0.62V; used for µP interrupt or cascaded reset initiation. |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width detectable. |
| 7 - RESET | Reset output | Active-low open-drain output; requires external pullup; remains low for ≥140ms after fault clearance. |
| 8 - WDO | Watchdog output | Independent active-low open-drain output; asserts on watchdog timeout or undervoltage; deasserts on MR low in A-version. |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three distinct supply rails using single 0.62V 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 automotive or industrial environments. |
| Independent watchdog output (WDO) | Provides dedicated NMI-capable signal separate from RESET, enabling concurrent fault diagnosis and recovery sequencing. |
| Low quiescent current (9–25µA) | Minimizes standby power in battery-backed or energy-constrained systems without sacrificing supervision accuracy. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V sensor interface, 3.3V MCU core, and 2.5V ADC reference rails under wide-temperature engine bay conditions. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across subsystems upon any rail dropout; provides 140ms hold time for EEPROM write completion. Use Value: Prevents corrupted firmware execution during cranking-induced 6V dips by holding reset until all rails stabilize above their trimmed thresholds. | Use Scenario: Supervising isolated 24V-to-5V DC-DC converter output, 3.3V FPGA configuration rail, and 1.8V DDR memory supply in modular I/O chassis. IC Role / Device Role / Timing Role: Centralized reset arbiter with PFI-driven early warning to trigger graceful shutdown before main supply failure. Use Value: Uses PFO interrupt to halt real-time task execution and save process state prior to loss of 5V logic rail, reducing restart latency. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit (RRU) |
Use Scenario: Ensuring safe startup and fault containment in battery-powered infusion pump with dual MCU domains (motor control + HMI). IC Role / Device Role / Timing Role: Dual-rail monitor (battery backup + regulated 3.3V) with manual reset for service mode entry; watchdog guards motor driver firmware. Use Value: Guarantees reset assertion even at 1.2V battery sag, preventing unintended motor activation during low-power states. | Use Scenario: Supervising 48V PoE-derived 12V intermediate rail, 5V FPGA rail, and 1.2V DSP core supply in outdoor base station equipment. IC Role / Device Role / Timing Role: Multivoltage watchdog supervisor with temperature-stable 60ppm/°C threshold drift for extended field life. Use Value: Maintains accurate reset timing across -40°C to +125°C ambient range, avoiding thermal-induced false resets in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6705TKA | Single-supply monitoring (VCC only), same T-suffix 3.08V threshold, identical 140ms reset timeout and 1.6s watchdog, but adds PFI/PFO pair. | Lacks dual adjustable inputs; suitable only for single-rail systems requiring power-fail warning. | Select MAX6705TKA when triple-voltage monitoring is unnecessary and PFI-based early warning is required. |
| TPS3808G30DBVR | TI part with 3.0V reset threshold, 200ms reset timeout, no PFI/PFO, no WDO - only WDT-triggered reset pulse. | No independent watchdog output or power-fail comparator; limited to basic reset + watchdog functions. | Choose TPS3808G30DBVR for cost-sensitive designs where PFI/WDO independence is not required. |
Compared with MAX6705TKA and TPS3808G30DBVR, the MAX6703TKA uniquely delivers triple-supply monitoring in the same SOT23-8 footprint while retaining independent WDO and PFO outputs - essential for systems requiring parallel fault signaling without software polling.
Availability
MAX6703TKA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and telecom remote radio units requiring stable component supply across extended temperature ranges.
Supply support for MAX6703TKA 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 robust, multivoltage microprocessor supervision in harsh environments - emphasizing guaranteed reset timing, low-voltage operation, and integrated watchdog/power-fail functionality.
FAQ
What is the exact reset threshold voltage for MAX6703TKA?
The MAX6703TKA features a factory-trimmed VCC reset threshold of 3.08V (T-suffix), specified over the full -40°C to +125°C operating temperature range with ±30mV tolerance. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" for MAX670_T/MAX670_AT variants and applies directly to MAX6703TKA.
Does MAX6703TKA support triple-voltage monitoring, and how is it configured?
Yes, MAX6703TKA supports triple-voltage monitoring via its VCC input plus two user-adjustable inputs: RST_IN1 (pin 4) and RST_IN2 (pin 5). Each uses the internal 0.62V reference; external resistor dividers set individual trip points. Configuration follows Figure 8 in the datasheet, where R1 = R2 × (VEXT_TH/0.62 − 1), ensuring precise threshold alignment for auxiliary rails like 3.3V or 2.5V.
What is the function of the WDO pin on MAX6703TKA, and how does it differ from RESET?
The WDO pin on MAX6703TKA is an independent active-low open-drain watchdog output that asserts low upon 1.6s watchdog timeout or VCC/RST_IN undervoltage - separate from the RESET pin. Unlike RESET, WDO can be used for non-maskable interrupts (NMI) or fault logging without affecting processor reset state, enabling concurrent diagnostics and recovery actions in the MAX6703TKA design.
Can MAX6703TKA operate reliably during severe supply transients, such as automotive load dump?
Yes, MAX6703TKA is designed for transient resilience: it rejects sub-100ns VCC glitches (MR glitch rejection = 100ns) and maintains valid reset assertion down to VCC = 1V. Its internal comparators feature hysteresis and slow-edge immunity, making it suitable for automotive ECU applications where load dump or cranking events cause rapid voltage excursions - confirmed in the Absolute Maximum Ratings and Typical Operating Characteristics.
Is MAX6703TKA pin-compatible with other members of the MAX6701–MAX6708 family?
MAX6703TKA shares the identical 8-pin SOT23-8 pinout with MAX6701–MAX6708 devices, including matching MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO assignments. However, functional differences exist: MAX6703TKA provides dual adjustable inputs and open-drain RESET, whereas MAX6704 offers complementary RESET outputs and MAX6708 omits WDO - so PCB layout is reusable, but firmware and external circuitry must match the specific variant's capabilities.
MAX6703TKA 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.08V, 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
MAX6703TKA FAQ
1.How can I place an order for MAX6703TKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703TKA 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 MAX6703TKA reliable?
The price and inventory of MAX6703TKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703TKA is usually 5 days.
3.What payment methods are accepted for MAX6703TKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703TKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703TKA?
MAX6703TKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703TKA 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 MAX6703TKA?
For technical support, including MAX6703TKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703TKA requirements.
6.How does Aetrix verify that MAX6703TKA is sourced from the original manufacturer or authorized distributors?
All MAX6703TKA 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 MAX6703TKA meets industry standards.
7.What is the process for return or replacement of MAX6703TKA?
All MAX6703TKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703TKA, 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 MAX6703TKA part is unused and in its original packaging.
Return procedure for MAX6703TKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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