Analog Devices Inc./Maxim Integrated MAX6338PUB+

Overview

MAX6338PUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, adjustable (via resistor divider), and -5.0V supplies with ±5% tolerance, consuming only 25µA typical supply current, and operating from +2.5V to +5.5V VCC - used in telecom power sequencing and industrial embedded control.

For engineers reviewing the MAX6338PUB+ datasheet, MAX6338PUB+ pinout, MAX6338PUB+ application, or MAX6338PUB+ equivalent, key selection considerations include its factory-programmed input configuration (IN1=+5.0V, IN2=+3.3V, IN3=adjustable, IN4=-5.0V), open-drain active-low outputs with internal 10µA pull-ups, guaranteed operation from -40°C to +85°C, and µMAX package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6338PUB+ integrates four independent comparators, each with a dedicated output and factory-trimmed threshold: IN1 monitors +5.0V at -5% tolerance (4.25V–4.50V trip), IN2 monitors +3.3V at -5% tolerance (2.85V–3.00V trip), IN3 uses the internal 1.23V bandgap reference with external resistor divider for user-adjustable thresholds, and IN4 monitors -5.0V at +5% tolerance (-4.75V to -4.50V trip).

All comparators feature built-in 0.3% hysteresis, eliminating need for external feedback networks; an internal undervoltage lockout forces all outputs low when VCC drops below +2.5V; outputs are open-drain with weak internal pull-ups to VCC, enabling wire-ORed "power good" signaling without external logic.

Key Specifications

Pinout & Package

The MAX6338PUB+ is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), compatible with standard surface-mount assembly processes and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and ADM1066ASTZ, the MAX6338PUB+ delivers optimal balance of integration, fixed-function reliability, and µMAX footprint for cost-sensitive, space-constrained multirail systems requiring no firmware interaction or bus overhead.

Availability

MAX6338PUB+ is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant lead-free packaging.

Supply support for MAX6338PUB+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6338 product line was designed specifically for compact, low-power multivoltage system supervision - targeting applications where simultaneous monitoring of positive, negative, and adjustable rails must occur with minimal external components and guaranteed temperature stability.

FAQ

What input voltage rails does the MAX6338PUB+ monitor?

The MAX6338PUB+ monitors four specific rails: IN1 is factory-set to +5.0V with -5% tolerance (trip at 4.25V–4.50V), IN2 to +3.3V with -5% tolerance (trip at 2.85V–3.00V), IN3 is user-adjustable via external resistor divider (referenced to 1.23V internal bandgap), and IN4 to -5.0V with +5% tolerance (trip at -4.75V to -4.50V). This exact configuration is unique to the MAX6338PUB+ variant.

Does the MAX6338PUB+ require external resistors for its factory-programmed thresholds?

No, the MAX6338PUB+ does not require external resistors for its +5.0V, +3.3V, or -5.0V monitoring channels - all thresholds are factory-trimmed using internal resistor dividers referenced to a precision 1.23V bandgap. Only the adjustable IN3 input requires external resistors to set a custom threshold; unused inputs (except IN3) are internally terminated.

How does the undervoltage lockout (UVLO) function in the MAX6338PUB+?

The MAX6338PUB+ incorporates an internal UVLO circuit that forces all four outputs low whenever VCC drops below +2.5V - the minimum operating voltage. This ensures clean, predictable fault signaling even during brownout or power-down conditions, and remains active down to VCC = +1V as verified in the datasheet's functional diagram and absolute maximum ratings.

Can the outputs of the MAX6338PUB+ be wire-ORed together?

Yes, all four outputs of the MAX6338PUB+ are open-drain, active-low, and feature weak internal 10µA pull-ups to VCC. This architecture allows them to be directly connected to a common node with a single external pull-up resistor, generating a composite "power fail" signal that asserts low if any monitored rail fails - a key design feature confirmed in the Pin Description and Applications Information sections.

What is the temperature range guarantee for the MAX6338PUB+?

The MAX6338PUB+ is fully specified and guaranteed over the extended industrial temperature range of -40°C to +85°C. Electrical characteristics including threshold accuracy (±1.5%), supply current (25µA typ), and propagation delay (20µs max) are validated across this full range, as documented in the Electrical Characteristics table and Absolute Maximum Ratings section of the official datasheet.