Analog Devices Inc./Maxim Integrated MAX6703ATKA+T

Overview

MAX6703ATKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC that monitors three supply voltages (one fixed +3.08V VCC threshold and two adjustable via RST_IN1/RST_IN2), provides a 140ms reset timeout, independent watchdog output (WDO), manual reset input (MR), and power-fail warning (PFI/PFO). It operates from 1.2V to 5.5V and guarantees valid reset down to VCC = 1V, targeting critical µP power monitoring in white goods and networking equipment.

For engineers reviewing the MAX6703ATKA+T datasheet, MAX6703ATKA+T pinout, MAX6703ATKA+T application, or MAX6703ATKA+T equivalent, this device delivers triple-voltage supervision with independent watchdog assertion, open-drain reset for flexible logic-level interfacing, and 0.62V precision power-fail detection - key selection criteria for industrial embedded systems requiring robust brownout and fail-safe recovery.

Technical Context

The MAX6703ATKA+T implements a triple-threshold supervision architecture: primary VCC reset at 3.08V (±3% over -40°C to +125°C), plus two user-adjustable thresholds (0.62V reference) on RST_IN1 and RST_IN2 for monitoring secondary supplies. Its watchdog timer asserts WDO low after 1.6s of no WDI edge transition, and WDO deasserts immediately upon valid WDI toggle or MR pull-low - unlike non-A versions which latch WDO until WDI activity.

Reset generation uses an internal 140–300ms timeout (temperature-dependent) following any undervoltage event on VCC, RST_IN1, or RST_IN2. The open-drain RESET output supports wired-OR configurations and level-shifting, while PFI/PFO provide a dedicated 0.62V comparator path with <6mV hysteresis for early power-fail signaling.

Key Specifications

Pinout & Package

MAX6703ATKA+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 (indicated by "+T" suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6703TKA+T and TPS3808G33DBVR, the MAX6703ATKA+T uniquely combines triple-voltage supervision, open-drain reset, dedicated power-fail comparator, and MR-controllable watchdog - enabling compact, fail-safe designs in space-constrained industrial controllers.

Availability

MAX6703ATKA+T is available at Aetrix Electronics and suitable for industrial PLC control, smart home gateway design, telecom line cards, and white goods inverter control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6703ATKA+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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications, emphasizing reliability, integration, and thermal robustness.

The MAX6701–MAX6708 family targets microprocessor power integrity in harsh environments, delivering precision voltage monitoring, watchdog safety, and power-fail prediction in miniature SOT23 packages for space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for MAX6703ATKA+T?

The MAX6703ATKA+T has a nominal VCC reset threshold of 3.08V, with tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This corresponds to the "T" suffix in the Threshold Suffix Guide and is optimized for reliable supervision of +3.3V supply rails under varying thermal and load conditions.

Does MAX6703ATKA+T support monitoring of three independent voltage rails?

Yes, the MAX6703ATKA+T monitors three rails: the primary VCC supply (3.08V threshold), plus two user-adjustable rails via RST_IN1 and RST_IN2 pins. Each uses the internal 0.62V reference with external resistor dividers, enabling precise supervision of auxiliary supplies such as 2.5V, 1.8V, or custom voltages.

How does the watchdog behavior differ between MAX6703ATKA+T and non-A versions?

In the MAX6703ATKA+T (A-version), WDO deasserts immediately upon either a valid WDI edge or pulling MR low. In contrast, the non-A MAX6703TKA+T latches WDO low until a WDI edge occurs - making the A-version essential for applications requiring MR-initiated watchdog reset clearance.

What is the function of the PFI and PFO pins on MAX6703ATKA+T?

PFI is a high-impedance input referenced to an internal 0.62V comparator; connecting it to a resistor divider enables early warning of supply droop. PFO is the corresponding open-drain active-low output that asserts when PFI falls below 0.62V - commonly used to trigger µP interrupts for graceful shutdown before complete power loss.

Is MAX6703ATKA+T compatible with 1.8V logic systems?

Yes, the MAX6703ATKA+T operates down to VCC = 1.2V and guarantees valid RESET output down to 1V. Its MR, WDI, and PFI inputs accept logic levels referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and its open-drain RESET and WDO outputs can be pulled up to 1.8V, enabling seamless integration into low-voltage µP systems.