Analog Devices Inc./Maxim Integrated MAX6463UK42+T

Overview

MAX6463UK42+T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in space-constrained portable systems. It features a factory-set 4.2V lower trip threshold (VTH−), 5% internal hysteresis, 17µs propagation delay, and 1.0µA supply current at 3.6V - enabling reliable reset assertion in Li-ion battery-powered devices such as cellular phones and portable medical equipment.

For engineers reviewing the MAX6463UK42+T datasheet, MAX6463UK42+T pinout, MAX6463UK42+T application, or MAX6463UK42+T equivalent, key selection considerations include its open-drain active-low output stage, −40°C to +125°C operating range, ±2.5% threshold accuracy over temperature, immunity to short VCC transients, and compatibility with logic supplies up to 6V via external pullup.

Technical Context

The MAX6463UK42+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set its 4.2V nominal VTH− threshold. Its hysteresis circuit ensures VTH+ = VTH− × 1.05 (≈4.41V), preventing output chatter during slow-rising or noisy supply conditions.

This device belongs to the MAX6461–MAX6466 family's voltage detector subgroup (not µP supervisory), so it lacks a minimum reset timeout period and asserts output immediately upon VCC falling below VTH−, holding low until VCC exceeds VTH+. Its open-drain output requires an external pullup resistor and supports level-shifting across logic domains.

Key Specifications

Pinout & Package

MAX6463UK42+T is housed in a 5-pin SOT23-5 package with exposed pad (pin 5 is GND). All pins are electrically defined per the MAX6461–MAX6466 functional specification and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB42DBZR and TPS3808G33DBVR, MAX6463UK42+T uniquely combines 4.2V precision detection, open-drain output, dual-GND SOT23-5 thermal robustness, and guaranteed 1.0µA operation across −40°C to +125°C - making it optimal for high-reliability Li-ion monitoring where level-shifting and thermal stability are critical.

Availability

MAX6463UK42+T is available at Aetrix Electronics and suitable for Li-ion battery management, portable medical diagnostics, and industrial sensor node applications requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6463UK42+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 power, sensing, and interface applications in industrial, automotive, and portable markets.

The MAX6461–MAX6466 product line delivers ultra-low-power voltage supervision for battery-critical systems, emphasizing threshold accuracy, minimal quiescent current, and robust transient immunity without external components.

FAQ

What is the exact voltage threshold of MAX6463UK42+T and how does it vary with temperature?

The MAX6463UK42+T has a nominal lower trip threshold (VTH−) of 4.200V at +25°C. Over the full −40°C to +125°C operating range, VTH− remains within ±2.5% of nominal, i.e., 4.095V (min) to 4.305V (max). The upper threshold VTH+ is fixed at VTH− × 1.05, providing 5% hysteresis to prevent chatter. These values are factory-trimmed and guaranteed by design, not production-tested at extremes.

Does MAX6463UK42+T provide a reset timeout period like some supervisory ICs?

No, MAX6463UK42+T does not include a reset timeout period. As a voltage detector (not a µP supervisory circuit), it asserts its open-drain output immediately when VCC falls below VTH− and releases it as soon as VCC rises above VTH+. The MAX6464–MAX6466 variants offer a minimum 150ms timeout; MAX6463UK42+T is optimized for instantaneous detection without delay.

Can MAX6463UK42+T interface with a 1.8V microcontroller reset input?

Yes, MAX6463UK42+T's open-drain output supports level-shifting. Connect an external pullup resistor from the OUT pin to the 1.8V supply rail. When asserted, OUT sinks current and pulls down to <0.4V (guaranteed at ISINK = 1.0mA); when released, the pullup brings OUT to 1.8V - fully compatible with 1.8V logic thresholds. No additional level translators are needed.

What is the maximum sink current capability of the MAX6463UK42+T output?

The MAX6463UK42+T open-drain output guarantees VOL ≤ 0.4V at ISINK = 9.0mA when VCC ≥ 4.5V. At lower VCC (≥1.2V), it guarantees VOL ≤ 0.3V at ISINK = 1.0mA. This allows direct driving of typical CMOS reset inputs (which draw <10µA) and small LED indicators, but not high-current loads - external buffering is required for >10mA sinks.

Is the N.C. pin on MAX6463UK42+T required to be grounded?

No, pin 5 (N.C.) on MAX6463UK42+T is internally unconnected and has no electrical function. It may be left floating or tied to GND for mechanical stability or thermal relief, but grounding it does not affect electrical performance. Both GND pins (2 and 4) must be connected to system ground; the N.C. pin serves only as a structural placeholder in the SOT23-5 outline.