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Analog Devices Inc./Maxim Integrated MAX6703SKA+T
- Part No.:
- MAX6703SKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703SKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
MAX6703SKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors three supply rails (VCC + two adjustable thresholds via 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 networking equipment requiring reliable power-up/down and brownout protection.
For engineers reviewing the MAX6703SKA+T datasheet, MAX6703SKA+T pinout, MAX6703SKA+T application, or MAX6703SKA+T equivalent, this page delivers verified specifications, SOT23-8 pin mapping, triple-supply supervision architecture, watchdog behavior differences between standard and A versions, and real-world design implications of its open-drain RESET and independent WDO outputs.
Technical Context
The MAX6703SKA+T implements a triple-threshold supervision architecture: VCC is monitored against a fixed factory-set threshold (2.93V typ, suffix 'S'), while RST_IN1 and RST_IN2 accept external resistor dividers to set two additional undervoltage trip points referenced to a 0.62V internal bandgap. All three comparators feed into a single reset generator with guaranteed assertion down to VCC = 1V.
Its watchdog circuit asserts WDO low after 1.6s (typ) of no WDI edge transition, but unlike non-A versions, the A-version WDO deasserts immediately when VCC/RST_IN1/RST_IN2 recover - no timeout delay - and can also be cleared by pulling MR low. The open-drain RESET output requires an external pullup and supports system-level reset coordination across multiple voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.93V typical, ±1.5% over -40°C to +125°C - sets primary power-fail detection point for +3.0V/+3.3V rails |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s typical - provides fail-safe recovery window for firmware hangs without affecting reset timing |
| Power-Fail Input Threshold | 0.62V ±9mV - enables precise external voltage monitoring via resistor divider on PFI pin |
| Supply Voltage Range | 1.2V to 5.5V - supports operation during brownout and allows supervision of ultra-low-voltage subsystems |
| Output Type | Active-low open-drain RESET and WDO - permits wired-OR reset bus sharing and level translation across voltage domains |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood applications |
Pinout & Package
MAX6703SKA+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 ('+T' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces reset and clears watchdog; debounces pushbutton switches |
| 2 - VCC | Main supply input | Primary voltage rail monitored at fixed 2.93V threshold; powers internal comparators and outputs |
| 3 - GND | Ground reference | Common return path for all internal circuits and comparator references |
| 4 - PFI | Power-fail input | High-impedance node for external resistive divider; triggers PFO when voltage drops below 0.62V |
| 5 - PFO | Power-fail output | Open-drain active-low output signaling imminent supply collapse; used to trigger orderly shutdown |
| 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 | Reset output | Open-drain active-low output; requires external pullup; asserted during VCC/RST_IN1/RST_IN2 undervoltage or MR activation |
| 8 - WDO | Watchdog output | Independent open-drain active-low output; latched low on watchdog timeout or undervoltage; cleared by WDI edge or MR low (A-version) |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables simultaneous monitoring of three distinct supply rails (e.g., core, I/O, analog) using one IC and two external resistor networks |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout, preventing µP from executing corrupted code at marginal supply levels |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches, avoiding spurious resets in noisy power environments like motor-driven white goods |
| Independent watchdog output (WDO) | Allows NMI-based fault logging or hardware-triggered diagnostics without interfering with main reset signal timing |
| 140ms reset timeout with temperature stability | Provides consistent reset hold time across full -40°C to +125°C range, critical for industrial control reliability |
Applications
| Computers | Networking |
|---|---|
|
Use Scenario: Desktop motherboard power sequencing with +12V, +5V, and +3.3V rails. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting RESET only after all three supplies stabilize above their thresholds. Use Value: Prevents BIOS corruption by ensuring CPU, chipset, and peripherals initialize synchronously after clean power-up. |
Use Scenario: Ethernet switch line card with separate core, PHY, and management power domains. IC Role / Device Role / Timing Role: Monitors +1.8V core, +3.3V PHY, and +5V management rails; triggers PFO to initiate graceful link shutdown before power loss. Use Value: Eliminates packet loss and port flapping during AC brownouts by enabling controlled MAC-layer shutdown. |
| White Goods | Intelligent Instruments |
|
Use Scenario: Washing machine control board exposed to motor-induced supply noise and thermal cycling. IC Role / Device Role / Timing Role: Supervises +5V MCU supply, +3.3V sensor interface, and +2.5V ADC reference; uses MR for door-switch-initiated reset. Use Value: Maintains functional safety certification by guaranteeing reset assertion during 10ms VCC dips caused by brushless motor commutation. |
Use Scenario: Portable gas analyzer with battery-backed real-time clock and multi-sensor front-end. IC Role / Device Role / Timing Role: Monitors main Li-ion supply (+3.6V), RTC backup rail (+3.0V), and analog sensor bias (+2.5V); asserts RESET if any rail falls below threshold. Use Value: Preserves calibration integrity by halting measurement cycles during supply instability, preventing erroneous gas concentration readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA+T | Fixed VCC threshold of 3.08V (suffix 'T') vs. 2.93V (suffix 'S'); identical pinout, timing, and feature set | Better suited for +3.3V systems with tighter tolerance margins; less optimal for +3.0V rails where 2.93V avoids false trips | Select MAX6703SKA+T when supervising nominal +3.0V supplies; choose MAX6703TKA+T for +3.3V rails requiring higher trip point. |
| MAX6707SKA+T | Same 2.93V VCC threshold and SOT23-8 package, but features open-drain PFO and RST_IN1/RST_IN2 - no WDO output | Lacks independent watchdog output; PFO serves dual role as power-fail indicator and secondary reset source | Choose MAX6707SKA+T only if watchdog functionality is unnecessary and PFO must drive a reset input directly; MAX6703SKA+T retains full watchdog autonomy. |
Compared with MAX6703TKA+T and MAX6707SKA+T, the MAX6703SKA+T uniquely balances precise +3.0V rail supervision (2.93V threshold), triple-voltage capability, and fully decoupled watchdog signaling - making it optimal for cost-sensitive industrial controllers needing both robust reset coordination and independent fault detection.
Availability
MAX6703SKA+T is available at Aetrix Electronics and suitable for computers, networking equipment, white goods, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703SKA+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, designs precision analog and mixed-signal ICs for industrial, communications, and computing applications.
The MAX6701–MAX6708 family was engineered specifically for space-constrained µP systems needing multivoltage supervision, power-fail warning, and watchdog safety - targeting high-reliability embedded control in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage for MAX6703SKA+T?
The MAX6703SKA+T has a factory-trimmed VCC reset threshold of 2.93V (typical), with ±1.5% tolerance over -40°C to +125°C. This value corresponds to the 'S' suffix in the part number and is optimized for reliable supervision of +3.0V and +3.3V supply rails without false triggering during nominal operation.
Does MAX6703SKA+T support monitoring more than one supply voltage?
Yes, the MAX6703SKA+T monitors three supply voltages: the main VCC rail (at 2.93V), plus two additional rails via RST_IN1 and RST_IN2 pins. Each adjustable input uses an external resistor divider referenced to the internal 0.62V comparator threshold, enabling flexible triple-rail supervision in a single SOT23-8 package.
What is the function of the WDO pin on MAX6703SKA+T?
The WDO (Watchdog Output) pin on MAX6703SKA+T is an independent open-drain active-low output that asserts when the watchdog timer expires (after 1.6s of no WDI edge) or when VCC/RST_IN1/RST_IN2 fall below their thresholds. In the A-version, WDO deasserts immediately upon recovery or when MR is pulled low - providing diagnostic visibility without resetting the µP.
How does the manual reset (MR) input interact with the watchdog function in MAX6703SKA+T?
In the MAX6703SKA+T (A-version), pulling MR low both forces a system reset and clears the watchdog timer - deasserting WDO immediately. This allows pushbutton-initiated recovery without waiting for the 1.6s timeout. Unlike non-A versions, MR does not latch WDO; it provides synchronized reset and watchdog reset in one action.
Is MAX6703SKA+T compatible with 1.8V logic systems?
Yes, the MAX6703SKA+T operates down to VCC = 1.2V and guarantees valid RESET output down to 1V. Its MR, WDI, and PFI inputs accept logic thresholds defined as 0.3×VCC (low) and 0.7×VCC (high), making it fully interoperable with 1.8V GPIOs when powered from ≥1.8V supplies - confirmed in Electrical Characteristics Table (VIH/VIL specs).
MAX6703SKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6703SKA+T FAQ
1.How can I place an order for MAX6703SKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703SKA+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 MAX6703SKA+T reliable?
The price and inventory of MAX6703SKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703SKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703SKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703SKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703SKA+T?
MAX6703SKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703SKA+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 MAX6703SKA+T?
For technical support, including MAX6703SKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703SKA+T requirements.
6.How does Aetrix verify that MAX6703SKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703SKA+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 MAX6703SKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703SKA+T?
All MAX6703SKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703SKA+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 MAX6703SKA+T part is unused and in its original packaging.
Return procedure for MAX6703SKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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