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Analog Devices Inc./Maxim Integrated MAX6703RKA+T
- Part No.:
- MAX6703RKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703RKA+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:376
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Product details
Overview
MAX6703RKA+T from Maxim Integrated is a precision microprocessor supervisory circuit in 8-pin SOT23 package, providing active-low open-drain reset output, manual reset input, watchdog timer with independent WDO output, and dual adjustable reset inputs (RST_IN1/RST_IN2) for triple-voltage monitoring. It features 2.63V VCC reset threshold, 140ms reset timeout, 1.6s watchdog timeout, and operates from -40°C to +125°C - used in critical µP power monitoring for white goods and industrial controllers.
For engineers reviewing the MAX6703RKA+T datasheet, MAX6703RKA+T pinout, MAX6703RKA+T application, or MAX6703RKA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed triple-supply supervision capability, open-drain reset configuration, and validated alternative options for brownout-sensitive embedded systems.
Technical Context
The MAX6703RKA+T implements a triple-threshold supervision architecture: primary VCC monitoring at 2.63V (R suffix), plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V internal comparator - enabling simultaneous monitoring of three system rails. Its watchdog timer asserts WDO low after 1.6s of WDI inactivity and clears on any edge transition.
Reset generation is synchronized to VCC, RST_IN1, or RST_IN2 undervoltage events, with guaranteed RESET validity down to VCC = 1V and immunity to short falling transients. The active-low open-drain RESET output supports flexible pull-up configurations, while MR includes internal 50kΩ pullup and 200ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (R-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for main supply |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable power-up sequencing |
| Watchdog Timeout | 1.6s typical - provides fail-safe recovery window for firmware lockup detection |
| Power-Fail Input Threshold | 0.62V ±9mV - enables accurate external voltage divider-based monitoring of secondary supplies |
| Supply Current | 9µA typical at VCC < 3.6V - minimizes quiescent load on battery-backed or low-power systems |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Package | 8-pin SOT23 - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6703RKA+T is housed in an 8-pin SOT23 package (package code K8+2, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm body, and thermal pad not present. Pin 1 is marked by dot or bevelled corner.
| 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; 200ns minimum pulse width required |
| 2 VCC | Main supply input | Primary power source and reference for VCC reset threshold (2.63V); powers push-pull outputs; valid from 1.0V to 5.5V |
| 3 GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance connection |
| 4 PFI | Power-fail input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; connects to external resistor divider for secondary supply monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output asserted when PFI < 0.62V; sinks up to 200µA at VCC ≥ 1.8V; used for early power-fail interrupt signaling |
| 6 WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; 50ns minimum pulse width detectable |
| 7 RESET | Active-low reset output | Open-drain output; requires external pullup; asserts low during VCC/RST_IN1/RST_IN2 undervoltage or MR assertion; holds for 140ms post-recovery |
| 8 WDO | Active-low watchdog output | Open-drain output; asserts low on watchdog timeout or VCC/RST_IN1/RST_IN2 undervoltage; deasserts on WDI edge or MR low (A-version behavior) |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables monitoring of three independent supply rails (VCC + two external) using single 0.62V reference - eliminates need for additional comparators |
| Active-low open-drain RESET and WDO | Supports wired-OR reset bus architectures and mixed-voltage systems via external pullup selection - avoids level-shifter requirements |
| Guaranteed reset validity to VCC = 1V | Ensures reliable reset assertion during deep brownout or battery discharge conditions where other supervisors lose functionality |
| 140ms reset timeout with temperature stability | Fixed delay meets JEDEC JESD84-B51 power-up timing requirements for NAND flash and DDR memory initialization |
| Immunity to short falling VCC transients | Rejects sub-10µs supply dips without false reset assertion - critical for noisy switching regulator environments |
Applications
| Industrial Controllers | White Goods |
|---|---|
|
Use Scenario: PLC I/O modules requiring deterministic reset during AC line sags or DC bus fluctuations. IC Role / Device Role / Timing Role: Triple-voltage supervisor monitors 24V field power, 5V logic rail, and 3.3V MCU core - asserting RESET only when all three remain stable. Use Value: Prevents spurious I/O state changes during partial power loss by holding µP in reset until all rails exceed 2.63V, 0.62V×(R1/R2+1), and 0.62V×(R3/R4+1) thresholds. |
Use Scenario: Refrigerator main control board with separate 12V compressor driver, 5V sensor interface, and 3.3V MCU supply. IC Role / Device Role / Timing Role: MAX6703RKA+T supervises all three rails simultaneously using VCC, RST_IN1, and RST_IN2 - triggering unified reset if any rail drops below threshold. Use Value: Eliminates need for three discrete reset ICs, reducing BOM count and PCB area while ensuring coordinated restart after brownout recovery. |
| Critical µP Power Monitoring | Networking Equipment |
|
Use Scenario: Medical infusion pump controller where firmware corruption must trigger immediate hardware reset. IC Role / Device Role / Timing Role: Watchdog timer monitors WDI toggling from MCU; WDO connected to MR to force 140ms reset pulse on timeout - independent of VCC status. Use Value: Guarantees fail-safe recovery even during partial power faults where VCC remains above 2.63V but firmware hangs. |
Use Scenario: Enterprise switch management processor requiring early warning of 12V PoE supply degradation. IC Role / Device Role / Timing Role: PFI monitors 12V rail via resistor divider; PFO interrupts µP before brownout occurs - allowing graceful shutdown of non-critical ports. Use Value: Provides 1µs PFI-to-PFO propagation delay and 6mV hysteresis to avoid chatter during slow supply decay, extending system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703RKA-T | Same functionality and pinout, but leaded (Pb-containing) packaging instead of lead-free (+T) | Not suitable for RoHS-compliant production; identical electrical performance and thermal specs | Select MAX6703RKA-T only for legacy rework or non-RoHS prototyping |
| MAX6705RKA+T | Single-supply supervisor (VCC only) with PFI/PFO and open-drain RESET/WDO - lacks RST_IN1/RST_IN2 inputs | Cannot monitor triple voltages; suited for simpler systems with one main rail plus auxiliary monitoring | Choose MAX6705RKA+T when triple-supply supervision is unnecessary and cost reduction is prioritized |
Compared with MAX6703RKA+T, MAX6703RKA-T offers identical supervision functionality but violates modern environmental compliance standards, while MAX6705RKA+T reduces system complexity at the expense of triple-rail monitoring capability - making it suitable only for single-rail designs.
Availability
MAX6703RKA+T is available at Aetrix Electronics and suitable for industrial controllers, white goods, and critical µP power monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6703RKA+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 demanding industrial, automotive, and communications applications - emphasizing reliability, low power, and integration.
The MAX6701–MAX6708 family targets space-constrained embedded systems needing robust power supervision with minimal external components - specifically engineered for triple-voltage monitoring and fail-safe watchdog operation in harsh environments.
FAQ
What is the exact reset threshold voltage for MAX6703RKA+T?
The MAX6703RKA+T has a nominal VCC reset threshold of 2.63V (R-suffix), specified as 2.53V (min) to 2.72V (max) over -40°C to +125°C. This value is factory-trimmed and guaranteed per device - not adjustable. It applies exclusively to the VCC input; RST_IN1 and RST_IN2 use the internal 0.62V reference for external divider-based thresholds.
Does MAX6703RKA+T support triple-voltage monitoring, and how is it configured?
Yes, MAX6703RKA+T supports triple-voltage monitoring via VCC (2.63V fixed threshold), RST_IN1, and RST_IN2 - each referenced to the same 0.62V internal comparator. To configure, connect resistor dividers from each monitored supply to RST_IN1/RST_IN2, selecting ratios so the divided voltage falls below 0.62V at the desired trip point. Reset asserts if any of the three inputs drops below its threshold.
What is the function of the WDO pin on MAX6703RKA+T, and how does it differ from RESET?
The WDO pin on MAX6703RKA+T is an active-low open-drain watchdog output that asserts independently of the RESET pin. It goes low on watchdog timeout (1.6s WDI inactivity) or VCC/RST_IN1/RST_IN2 undervoltage, and deasserts on WDI edge or MR low. Unlike RESET, WDO does not hold for 140ms - it responds immediately to fault clearance, enabling real-time watchdog status monitoring without reset interference.
Can MAX6703RKA+T operate reliably down to 1V supply voltage?
Yes, MAX6703RKA+T guarantees RESET output validity down to VCC = 1V - meaning the open-drain RESET pin remains functional and can sink current (≤0.4V at 50µA) even as VCC decays to 1V. Below 1V, RESET becomes high-impedance. This feature ensures deterministic reset assertion during deep brownout conditions where many competitors cease operation.
Is MAX6703RKA+T pin-compatible with other members of the MAX6701–MAX6708 family?
MAX6703RKA+T shares the same 8-pin SOT23 package and pinout with all MAX6701–MAX6708 variants, including MAX6703A, MAX6705, and MAX6707. However, functional differences exist: MAX6703RKA+T provides dual adjustable inputs and open-drain RESET/WDO, while MAX6704 offers complementary RESET outputs and MAX6708 omits the watchdog. Electrical compatibility requires verifying reset type, threshold, and feature set per application.
MAX6703RKA+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.63V, 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
MAX6703RKA+T FAQ
1.How can I place an order for MAX6703RKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703RKA+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 MAX6703RKA+T reliable?
The price and inventory of MAX6703RKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703RKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703RKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703RKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703RKA+T?
MAX6703RKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703RKA+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 MAX6703RKA+T?
For technical support, including MAX6703RKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703RKA+T requirements.
6.How does Aetrix verify that MAX6703RKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703RKA+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 MAX6703RKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703RKA+T?
All MAX6703RKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703RKA+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 MAX6703RKA+T part is unused and in its original packaging.
Return procedure for MAX6703RKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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