Analog Devices Inc./Maxim Integrated MAX6806XR46+T

Overview

MAX6806XR46+T from Maxim Integrated is a precision voltage detector IC designed for power-supply monitoring in microprocessor-based systems. It features a factory-preset 4.6V ±2% reset threshold, active-low push-pull RESET output, guaranteed operation down to VCC = 1.0V, 35µA supply current, and internal hysteresis - used in critical µP power monitoring for computers, intelligent instruments, and portable battery-powered equipment.

For engineers reviewing the MAX6806XR46+T datasheet, MAX6806XR46+T pinout, MAX6806XR46+T application, or MAX6806XR46+T equivalent, key selection criteria include reset threshold accuracy, low-voltage reset validity (to 1V), push-pull output drive capability, SC70-3 package footprint, and immunity to power-supply transients in embedded power-monitoring circuits.

Technical Context

The MAX6806XR46+T implements a precision bandgap-based voltage comparator with internal hysteresis (VHYST = 0.02–0.03 × VTH−) to prevent output chatter near threshold. Its reset assertion is purely analog - no internal timer or delay circuitry - enabling immediate response to VCC falling below 4.508V (min) or rising above 4.692V (max) at +25°C.

It operates across −40°C to +85°C with supply current stable from 1.0V to 5.5V VCC, and its push-pull output drives logic loads directly without external pull-up resistors. The SC70-3 package excludes manual reset (MR), distinguishing it from SOT143 variants.

Key Specifications

Pinout & Package

MAX6806XR46+T is housed in a 3-pin SC70 package (outline 21-0075), with 0.65mm pitch, 1.25mm × 0.85mm body, and moisture sensitivity level (MSL) 1. Pin functions are standardized across SC70/SOT23 variants per Maxim's pin configuration diagrams.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with MAX6326UR46-T and TPS3808G33DBVR, the MAX6806XR46+T uniquely combines 4.6V ±2% threshold, 1.0V operational floor, and active-low push-pull output in SC70-3 - making it optimal for space-constrained, low-voltage-critical µP reset applications where external components must be minimized.

Availability

MAX6806XR46+T is available at Aetrix Electronics and suitable for computers, intelligent instruments, and critical µP systems requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for MAX6806XR46+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, mixed-signal, and power-management ICs for industrial, computing, and communications applications.

The MAX6806 family delivers highly accurate, low-power voltage detection for microprocessor supervisory functions - targeting systems where supply margin, reset timing fidelity, and minimal external components are essential.

FAQ

What is the exact reset threshold voltage of MAX6806XR46+T and how tight is its tolerance?

The MAX6806XR46+T has a factory-preset nominal reset threshold of 4.6V with ±2% accuracy over temperature - meaning the actual threshold falls between 4.508V and 4.692V at +25°C, and remains within ±30 ppm/°C tempco across −40°C to +85°C. This specification is guaranteed per Maxim's Electrical Characteristics table and applies specifically to the MAX6806XR46+T variant, not the broader MAX6806 family.

Does MAX6806XR46+T support operation below 2.0V, and what happens to the RESET output at low VCC?

Yes, MAX6806XR46+T is fully specified down to VCC = 1.0V. Its RESET output remains a valid active-low logic signal (VOL ≤ 0.3V at ISINK = 20µA) throughout this range. Below 1.0V, RESET becomes high-impedance - but since most µPs are nonfunctional below 1.0V, this behavior is intentional and documented in the datasheet's "Ensuring a Valid Reset Output Down to VCC = Ground" section.

Is the RESET output of MAX6806XR46+T push-pull or open-drain, and why does that matter for my µP interface?

The MAX6806XR46+T features an active-low push-pull RESET output - meaning it actively drives low and high states without requiring external pull-up resistors. This simplifies interface to µP reset pins that expect clean, rail-to-rail reset signals (e.g., many ARM and PIC devices), unlike open-drain alternatives like MAX6808XR46+T which require external pull-ups and add timing uncertainty.

What package type is used by MAX6806XR46+T, and are there any layout or assembly considerations?

MAX6806XR46+T uses the 3-pin SC70 package (outline 21-0075), with 0.65mm pitch and 1.25mm × 0.85mm body size. It is RoHS-compliant and MSL-1 rated. Layout requires standard SC70 land pattern (90-0208), thermal relief on GND pad, and avoidance of solder mask dams between pins. Tape-and-reel delivery mandates 2500-piece minimum order quantity.

How does MAX6806XR46+T handle power-supply transients, and is external filtering needed?

MAX6806XR46+T is immune to short-duration negative-going VCC transients - it will not falsely trigger reset for pulses under ~100µs (depending on overdrive magnitude), as shown in Figure 3 of the datasheet. A 0.1µF ceramic capacitor placed close to the VCC pin further enhances transient immunity and is recommended for noisy environments, but is not strictly required for basic operation.