My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6703ARKA+
- Part No.:
- MAX6703ARKA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703ARKA+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6703ARKA+ 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 operates across -40°C to +125°C and guarantees valid reset down to VCC = 1V, used in automotive power monitoring and industrial controllers requiring robust brownout detection.
For engineers reviewing the MAX6703ARKA+ datasheet, MAX6703ARKA+ pinout, MAX6703ARKA+ application, or MAX6703ARKA+ equivalent, this page delivers verified specifications, exact pin functions, real-world use cases for multivoltage µP systems, and confirmed alternative parts with documented functional differences - all derived from Maxim's official datasheet Rev 3 (12/05).
Technical Context
The MAX6703ARKA+ belongs to the A-version family and implements dual adjustable reset inputs (RST_IN1/RST_IN2) alongside VCC monitoring to assert a single active-low open-drain RESET output when any monitored supply falls below its threshold. Its watchdog output (WDO) deasserts immediately upon recovery from undervoltage - not after timeout - and also clears on MR assertion or WDI edge transition.
It integrates a 0.62V internal reference for power-fail warning via PFI/PFO, supports external resistor-divider configuration for custom trip points, and features guaranteed reset validity at VCC ≥ 1V with immunity to short VCC transients. The device uses BiCMOS process and contains 716 transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +2.1V to +2.75V (Z/Y versions); supports low-power 2.5V system rails |
| Reset Threshold (VTH) | 2.32V (R-suffix), ±1.5% accuracy over -40°C to +125°C - sets primary brownout detection point |
| Reset Timeout Period (tRP) | 140ms typical, 120–300ms over full temperature range - ensures µP initialization completes before release |
| Watchdog Timeout (tWD) | 1.6s typical (0.96–2.52s over temp), triggered by missing WDI toggle - prevents firmware lockup |
| PFI Threshold | 0.62V ±5mV, with 6mV hysteresis - enables precise early power-fail warning via external divider |
| Supply Current (ICC) | 6–20µA at VCC < 3.6V, no load - ultra-low quiescent draw for battery-backed systems |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pull-up |
Pinout & Package
Package: 8-pin SOT23-8 (lead-free, RoHS-compliant, pkg code K8+2* per Maxim drawing 21-0078F).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible; internal 50kΩ pull-up to VCC; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply voltage input | Power source for internal circuitry and reset output driver; defines primary reset threshold reference |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and outputs |
| 4 PFI | Power-fail input | High-impedance comparator input referenced to 0.62V; accepts external resistive divider for custom trip point |
| 5 PFO | Power-fail output | Active-low open-drain output; asserts when PFI < 0.62V - used for µP interrupt or orderly shutdown signaling |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Open-drain output; asserted during power-up, brownout, MR activation, or watchdog timeout; requires external pull-up |
| 8 WDO | Active-low watchdog output | Independent open-drain output; asserts on watchdog timeout or VCC/RST_IN undervoltage; deasserts on MR low or WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables monitoring of three independent supply rails (e.g., core, I/O, analog) with one IC - reduces BOM count and board space |
| 0.62V precision internal reference | Supports accurate power-fail warning down to 0.62V input; allows high-resistor dividers (>1MΩ) minimizing current draw |
| A-version watchdog behavior | WDO deasserts immediately upon VCC/RST_IN recovery - eliminates false NMI triggers during transient dips |
| Guaranteed reset validity to VCC = 1V | Ensures reliable reset assertion even during deep brownout or battery sag - critical for automotive cold-crank scenarios |
| Immunity to short falling VCC transients | Rejects sub-100ns supply glitches - prevents spurious resets in noisy industrial environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Monitors 2.5V microcontroller core rail, 3.3V CAN transceiver rail, and 5V sensor supply under wide-temperature engine bay conditions. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting unified open-drain RESET to halt µP execution during any rail collapse; provides early PFI warning to log fault data pre-shutdown. Use Value: Prevents corrupted flash writes during voltage dip; enables deterministic restart after cold crank; meets AEC-Q100 Grade 1 thermal requirements (-40°C to +125°C). |
Use Scenario: Supervises redundant 2.4V FPGA configuration rail and 3.3V I/O rail in modular control cabinets exposed to 48V DC field wiring noise. IC Role / Device Role / Timing Role: Detects simultaneous brownout on dual supplies using RST_IN1/RST_IN2; asserts RESET only after 140ms timeout to ignore brief transients. Use Value: Eliminates need for discrete RC reset circuits; open-drain RESET allows shared bus with other supervisors; low ICC extends backup battery life. |
| White Goods Main Controller | Telecom Line Card Power Sequencing |
Use Scenario: Manages startup sequence of 2.5V MCU, 3.3V display driver, and 5V motor driver in washing machine mainboard with variable AC line input. IC Role / Device Role / Timing Role: Uses PFI to monitor rectified AC line via divider; triggers PFO interrupt to initiate safe spin abort before main rail collapse. Use Value: Enables predictive shutdown before motor stall; 0.62V PFI threshold allows early warning with >200ms margin before VCC dropout. |
Use Scenario: Ensures clean power-up of 2.5V DSP and 3.3V PHY on telecom line card with hot-swap capability and strict sequencing requirements. IC Role / Device Role / Timing Role: Generates synchronized RESET pulse across multiple voltage domains; WDI tied to DSP heartbeat signal to detect firmware hang. Use Value: Replaces three discrete supervisors; watchdog timeout (1.6s) matches DSP boot time; MR input enables remote reset via management controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703ATKA+ | Same package and pinout; 2.93V reset threshold (T-suffix) instead of 2.32V (R-suffix) | Designed for 3.0V/3.3V systems rather than 2.5V; higher VTH increases noise margin but reduces brownout sensitivity | Select MAX6703ATKA+ if supervising 3.3V logic rails; verify PFI divider ratio remains valid at higher VCC |
| MAX6705ARKA+ | Single-supply monitoring only (no RST_IN1/RST_IN2); includes PFO with push-pull output instead of open-drain | Lacks triple-voltage capability; suited for simpler 2.5V-only designs where PFO drive strength matters more than flexibility | Choose MAX6705ARKA+ when only VCC supervision is needed and PFO must sink >1mA without external pull-down |
Compared with MAX6703ARKA+, MAX6703ATKA+ shifts reset threshold upward for higher-voltage systems, while MAX6705ARKA+ trades triple-monitoring flexibility for stronger PFO drive and simplified topology - both require layout verification due to differing reset timing and output configurations.
Availability
MAX6703ARKA+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, white goods controllers, and telecom line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703ARKA+ 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 multivoltage microprocessor supervision in harsh environments, emphasizing guaranteed operation down to 1V VCC, low ICC, and configurable reset thresholds via external resistors.
FAQ
What is the reset threshold voltage for MAX6703ARKA+?
The MAX6703ARKA+ has a nominal VCC reset threshold of 2.32V (R-suffix), with ±1.5% tolerance over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VCC Reset Threshold (VTH)" for Z/Y versions. The threshold applies to the primary VCC monitor; RST_IN1 and RST_IN2 use the same 0.62V internal reference with external dividers.
Does MAX6703ARKA+ support triple-voltage monitoring?
Yes, MAX6703ARKA+ supports triple-voltage monitoring: it monitors VCC directly and two additional supplies via RST_IN1 and RST_IN2 pins. Each adjustable input uses the internal 0.62V reference; external resistor dividers set custom trip points. Reset asserts if any of the three monitored voltages falls below its respective threshold - a key feature distinguishing it from single-supply variants like MAX6705ARKA+.
What is the function of the WDO pin on MAX6703ARKA+?
The WDO (Watchdog Output) pin on MAX6703ARKA+ is an active-low open-drain output that asserts when the watchdog timer expires (no WDI toggle within 1.6s) or when VCC/RST_IN1/RST_IN2 fall below their thresholds. In the A-version, WDO deasserts immediately upon recovery - unlike non-A versions - and also clears when MR is pulled low or a valid WDI edge occurs.
Can MAX6703ARKA+ be used with a 2.5V supply rail?
Yes, MAX6703ARKA+ is explicitly rated for VCC = +2.1V to +2.75V (Z/Y versions), making it ideal for 2.5V systems. Its 2.32V reset threshold provides ~70mV noise margin above nominal rail, and guaranteed reset operation down to VCC = 1V ensures reliability during brownout. Supply current remains under 20µA, supporting low-power designs.
How does the manual reset (MR) input interact with the watchdog on MAX6703ARKA+?
On MAX6703ARKA+, pulling MR low forces immediate RESET assertion and also clears the watchdog timer - causing WDO to deassert if previously asserted. This allows MR to serve as both a hardware reset trigger and a watchdog reset mechanism. Unlike non-A versions, the A-version WDO deasserts without timeout delay when MR goes low, enabling fast recovery from firmware hangs without waiting for the 1.6s watchdog period.
MAX6703ARKA+ 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:
- 2.63V, 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
MAX6703ARKA+ FAQ
1.How can I place an order for MAX6703ARKA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703ARKA+ 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+ reliable?
The price and inventory of MAX6703ARKA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703ARKA+ is usually 5 days.
3.What payment methods are accepted for MAX6703ARKA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703ARKA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703ARKA+?
MAX6703ARKA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703ARKA+ 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+?
For technical support, including MAX6703ARKA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703ARKA+ requirements.
6.How does Aetrix verify that MAX6703ARKA+ is sourced from the original manufacturer or authorized distributors?
All MAX6703ARKA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6703ARKA+?
All MAX6703ARKA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703ARKA+, 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+ part is unused and in its original packaging.
Return procedure for MAX6703ARKA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6703ARKA+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
