Analog Devices Inc./Maxim Integrated MAX6808UA46

Overview

MAX6808UA46 from Maxim Integrated is a precision 4.6V ±2% voltage detector IC with active-low open-drain RESET output, designed for power-supply monitoring in microprocessor-based systems. It asserts reset when VCC falls below 4.508V (min), 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 power monitoring.

For engineers reviewing the MAX6808UA46 datasheet, MAX6808UA46 pinout, MAX6808UA46 application, or MAX6808UA46 equivalent, this page delivers verified package mapping (8-pin µMAX), confirmed reset threshold accuracy, open-drain interface behavior, manual-reset capability (SOT143 only), and real-world timing performance under brownout and transient conditions.

Technical Context

The MAX6808UA46 implements a comparator-based reset detection architecture with factory-trimmed 4.6V threshold (VTH− = 4.508V to 4.692V at +25°C) and 20mV–30mV hysteresis (VHYST = 0.02×VTH− to 0.03×VTH−). Its open-drain RESET output requires an external pullup and sinks ≥20µA at VCC = 1.0V with VOL ≤ 0.3V.

It operates across −40°C to +85°C, supports VCC from 1.0V to 5.5V, exhibits 30ppm/°C tempco, and rejects negative-going VCC transients up to 100µs at 100mV overdrive-enabling reliable operation in noisy, battery-powered environments without external RC networks.

Key Specifications

Pinout & Package

MAX6808UA46 is housed in an 8-pin µMAX package (outline 21-0036), pin-compatible with MC33064/MC33164 series. The package has exposed pad for thermal enhancement and supports reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6808UA46, MAX6326UR46-T offers smaller footprint but forfeits open-drain interoperability, while TPS3808G33DBVR trades factory accuracy and fixed 4.6V compatibility for programmability and nanoamp quiescent current-making MAX6808UA46 optimal for deterministic, low-component-count 5V supervision.

Availability

MAX6808UA46 is available at Aetrix Electronics and suitable for portable/battery-powered equipment, bar-code scanners, and critical µP power monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6808UA46 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.

The MAX6806/MAX6807/MAX6808 family targets cost-sensitive, space-constrained power-supply supervision-delivering factory-trimmed thresholds, minimal external components, and robust transient immunity for µP-based digital systems.

FAQ

What is the exact reset threshold voltage for MAX6808UA46?

The MAX6808UA46 has a factory-preset nominal reset threshold of 4.6V, with guaranteed limits of 4.508V (min) to 4.692V (max) at +25°C. This ±2% accuracy holds across the full −40°C to +85°C operating temperature range, and the device includes internal hysteresis of 20–30mV to prevent oscillation near the trip point. The MAX6808UA46 uses this precise threshold to reliably detect 5V supply brownouts before downstream ICs enter undefined operating regions.

Does MAX6808UA46 support manual reset functionality?

No, MAX6808UA46 does not support manual reset. Manual reset (MR) input is only available on the 4-pin SOT143 package variants (e.g., MAX6808US46-T), which include an internal 80kΩ pulldown resistor and dedicated MR pin. The MAX6808UA46 uses the 8-pin µMAX package with pins 3, 5–8 designated as N.C., so MR functionality is absent. For designs requiring operator-initiated reset, MAX6808US46-T or MAX6808XR46-T (SC70) should be selected instead of MAX6808UA46.

What pullup resistor value is recommended for the open-drain RESET output of MAX6808UA46?

A 100kΩ pullup resistor is recommended for the MAX6808UA46 open-drain RESET output when driving high-impedance CMOS inputs. This value ensures sufficient sink current (≥20µA) to maintain VOL ≤ 0.3V at VCC = 1.0V while limiting leakage-induced voltage rise when RESET is deasserted. For heavier loads or faster rise times, values as low as 10kΩ may be used-but must be verified against the total capacitive load and required edge rate. The MAX6808UA46 datasheet confirms 100kΩ is sufficient for standard µP reset inputs.

Can MAX6808UA46 operate with VCC below 1.0V?

No, MAX6808UA46 is not specified to operate below VCC = 1.0V. Its electrical characteristics guarantee RESET output validity only down to 1.0V, and supply current, threshold accuracy, and hysteresis are not characterized below that point. When VCC falls below 1.0V, the internal circuitry ceases to function reliably, and the RESET output transitions to a high-impedance state. For applications requiring reset assertion all the way to 0V, an external pulldown resistor (e.g., 100kΩ) on the RESET line is recommended-as documented in the MAX6808UA46 application note.

Is MAX6808UA46 pin-compatible with legacy supervisory ICs like MC33064?

Yes, MAX6808UA46 in the 8-pin µMAX package is pin-compatible with MC33064, MC33164, MC34064, and MC34164. Pin 1 is (RESET), Pin 2 is VCC, Pin 4 is GND, and Pins 3/5–8 are N.C.-matching the functional pinout of those devices. However, MAX6808UA46 differs in output type (open-drain vs. push-pull) and threshold accuracy (±2% vs. ±5%), so external pullup and system-level timing validation are required. The MAX6808UA46 retains mechanical and layout compatibility while delivering improved precision and noise immunity.