Analog Devices Inc./Maxim Integrated MAX6808XR46

Overview

MAX6808XR46 from Maxim Integrated is a precision 4.6V ±2% active-low open-drain voltage detector IC for microprocessor power monitoring. It asserts reset when VCC falls below 4.508V (min) at +25°C, guarantees RESET validity down to VCC = 1.0V, draws only 35µA typical supply current, and features internal hysteresis for stable switching-used in portable equipment, bar-code scanners, and critical µP systems requiring reliable brownout detection.

For engineers reviewing the MAX6808XR46 datasheet, MAX6808XR46 pinout, MAX6808XR46 application, or MAX6808XR46 equivalent, this page delivers verified electrical specs, SC70-3 package details, open-drain output design implications, manual-reset capability limitations, and direct alternatives for 4.6V supervisor replacement in battery-powered and embedded control designs.

Technical Context

The MAX6808XR46 implements a precision bandgap-based voltage comparator with factory-trimmed 4.6V threshold (±2% over -40°C to +85°C), 20mV typical hysteresis (VHYST = VTH+ − VTH−), and temperature coefficient of 30ppm/°C. Its open-drain RESET output requires an external pullup resistor and supports interfacing with mixed-voltage systems up to 6V.

Unlike push-pull variants (MAX6806/MAX6807), the MAX6808XR46 avoids bus contention on bidirectional µP reset pins. It lacks MR input in SC70-3 packaging-manual reset is exclusive to SOT143 variants-and operates across full industrial temperature range with no external components required.

Key Specifications

Pinout & Package

MAX6808XR46 is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with pin 1 = RESET (active-low open-drain), pin 2 = GND, pin 3 = VCC. No MR pin is present-manual reset is unavailable in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6806XR46-T (push-pull) and TLV803EB26DBZR (ultra-low-I_CC), the MAX6808XR46 uniquely balances 1.0V operational floor, open-drain flexibility, and industrial temp range-making it optimal for battery-backed µP systems needing robust reset arbitration.

Availability

MAX6808XR46 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, critical µP and µC power monitoring, intelligent instruments, and computers requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6808XR46 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 consumer applications-with emphasis on reliability, integration, and low-power operation.

The MAX6806/MAX6807/MAX6808 family delivers highly accurate, low-quiescent-current voltage supervision for microprocessor-based systems-specifically engineered to replace discrete reset circuits in space-constrained, battery-sensitive, and noise-prone environments.

FAQ

What is the exact reset threshold voltage of MAX6808XR46 and how tightly is it specified?

The MAX6808XR46 has a nominal reset threshold of 4.60V, with guaranteed limits of 4.508V (minimum) and 4.692V (maximum) at +25°C, representing ±2% accuracy. This tolerance holds across the full operating temperature range (-40°C to +85°C), and the device includes 30ppm/°C tempco for predictable drift. The MAX6808XR46 uses factory laser-trimming to achieve this precision without external components.

Does MAX6808XR46 support manual reset functionality?

No, MAX6808XR46 does not support manual reset. Manual reset (MR) is only available on the 4-pin SOT143 package variants (e.g., MAX6808US46-T). The MAX6808XR46 uses a 3-pin SC70 package with pins limited to RESET, GND, and VCC-no MR terminal is present or internally connected in this variant.

What pullup resistor value is recommended for the open-drain RESET output of MAX6808XR46?

A 100kΩ pullup resistor is recommended for the MAX6808XR46 RESET output when driving high-impedance CMOS inputs. This value ensures sufficient sink current for a solid logic low (<0.3V at 20µA) while limiting leakage-induced voltage rise when RESET is deasserted. For faster edge rates or heavier loads, values between 10kΩ and 47kΩ may be used-always verify VOH and VOL under actual load conditions.

Can MAX6808XR46 operate reliably below 1.8V supply voltage?

Yes, MAX6808XR46 is fully specified down to VCC = 1.0V. Its RESET output remains valid (guaranteed logic low) for VCC ≥ 1.0V, and internal circuitry functions correctly across the entire 1.0V–5.5V range. This makes the MAX6808XR46 suitable for single-cell Li-ion, NiMH, or alkaline systems where supply can sag below 1.8V during peak load or end-of-discharge.

How does MAX6808XR46 handle power-supply transients, and what protection is recommended?

The MAX6808XR46 is immune to short-duration negative-going VCC transients up to 100µs wide when overdrive is ≤100mV below VTH−. To enhance immunity, place a 0.1µF ceramic capacitor as close as possible to the VCC pin. This suppresses high-frequency noise and prevents false resets caused by switching regulator ripple or ESD-induced dips-critical for reliable operation in portable and industrial environments.