Analog Devices Inc./Maxim Integrated MAX6702MKA+T

Overview

MAX6702MKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors +3.3V supply voltage with a 3.08V reset threshold, provides 140ms reset timeout, independent watchdog output (WDO), and manual reset input (MR). It ensures reliable power-up sequencing and brownout protection in embedded controllers and telecom infrastructure.

For engineers reviewing the MAX6702MKA+T datasheet, MAX6702MKA+T pinout, MAX6702MKA+T application, or MAX6702MKA+T equivalent, key selection criteria include its active-high reset output, 3.08V V_TH tolerance over –40°C to +125°C, 1.6s watchdog timeout, guaranteed reset validity down to V_CC = 1V, and SOT23-8 lead-free package compatibility.

Technical Context

The MAX6702MKA+T implements a dual-comparator architecture: one fixed-threshold monitor for V_CC (3.08V) and a separate 0.62V reference comparator for PFI/PFO power-fail warning. Its reset generator asserts RESET high when V_CC falls below threshold and holds it high for 140–300ms after recovery.

The integrated watchdog timer requires WDI toggling within 1.6s (typ); failure triggers WDO low independently of RESET. MR forces reset assertion regardless of V_CC level, with 200ns delay and 100ns glitch rejection - critical for deterministic system recovery in industrial controllers.

Key Specifications

Pinout & Package

MAX6702MKA+T is housed in an 8-pin SOT23 package (package code K8+2), RoHS-compliant and lead-free per +T suffix, with 0.65mm pitch and 2.9mm × 1.6mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6702MKA-T, the +T version ensures RoHS compliance without performance trade-offs; versus MAX6706MKA+T, the 3.08V threshold provides tighter margin for +3.3V systems, avoiding premature reset assertion during nominal ripple.

Availability

MAX6702MKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, and white goods requiring stable component supply across extended temperature ranges and RoHS-compliant manufacturing.

Supply support for MAX6702MKA+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.

The MAX6701–MAX6708 family delivers compact, low-power µP supervision with multi-rail monitoring and watchdog functionality - engineered specifically for space-constrained embedded systems needing robust power integrity assurance.

FAQ

What is the reset threshold voltage for MAX6702MKA+T and how is it specified over temperature?

The MAX6702MKA+T has a nominal reset threshold of 3.08V, with min/max limits of 2.97V to 3.17V across the full –40°C to +125°C operating range. This specification ensures reliable supervision of +3.3V supplies even under worst-case thermal and voltage drift conditions, eliminating need for external trimming.

Does MAX6702MKA+T provide both reset and watchdog outputs, and what are their logic polarities?

Yes, MAX6702MKA+T provides two independent outputs: an active-high push-pull RESET output and an active-low watchdog output (WDO). The RESET output goes high when V_CC drops below 3.08V and remains high for 140–300ms after recovery; WDO goes low if WDI is not toggled within 1.6s.

Can MAX6702MKA+T monitor voltages other than V_CC, and how is this implemented?

Yes, MAX6702MKA+T includes a dedicated 0.62V reference comparator accessible via PFI and PFO pins. By connecting PFI to a resistive divider from any system voltage, users can configure early-warning power-fail detection for secondary rails (e.g., +5V, +2.5V, or analog supplies) without adding external comparators.

What is the minimum V_CC level at which MAX6702MKA+T guarantees valid reset output operation?

MAX6702MKA+T guarantees valid RESET output operation down to V_CC = 1V. Below this voltage, the output becomes high-impedance. This feature ensures deterministic reset assertion during deep brownout events common in automotive and industrial power systems before supply collapse.

Is MAX6702MKA+T compatible with manual reset pushbutton interfaces, and what are the electrical requirements?

Yes, MAX6702MKA+T features an MR pin with internal 50kΩ pullup to V_CC. A simple SPST pushbutton to ground suffices for manual reset initiation. The input accepts CMOS logic levels (V_IL ≤ 0.3×V_CC, V_IH ≥ 0.7×V_CC) and rejects glitches shorter than 100ns, ensuring noise-immune operation in harsh EMI environments.