Analog Devices Inc./Maxim Integrated MAX6338PUB+T

Overview

MAX6338PUB+T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, adjustable, and -5.0V supplies with 5% tolerance, consuming 25µA typical supply current, operating from +2.5V to +5.5V VCC, and delivering four independent open-drain active-low outputs in a 10-pin µMAX package - used in telecom power sequencing and industrial equipment fault detection.

For engineers reviewing the MAX6338PUB+T datasheet, MAX6338PUB+T pinout, MAX6338PUB+T application, or MAX6338PUB+T equivalent, this page delivers verified threshold voltages (+5.0V at 4.75V nominal trip, +3.3V at 3.15V, -5.0V at -4.75V), factory-programmed 5% tolerance per input, internal 1.23V bandgap reference, guaranteed operation from -40°C to +85°C, and wire-ORable output architecture for consolidated power-good signaling.

Technical Context

The MAX6338PUB+T implements four independent comparators, each with its inverting input tied to an internal 1.23V bandgap reference and noninverting inputs accessed via factory-laser-trimmed resistor dividers - enabling precise, no-component threshold setting for +5.0V, +3.3V, and -5.0V rails. The fourth input (IN3) is configured as an auxiliary (AUX) comparator with direct access to the positive terminal, supporting user-adjustable thresholds using external resistive dividers referenced to the 1.23V internal reference.

It integrates undervoltage lockout (UVLO) that forces all outputs low when VCC drops below +2.5V, and features built-in 0.3% hysteresis per channel to prevent noise-induced oscillation - eliminating need for external hysteresis networks. All four open-drain outputs include weak 10µA internal pull-ups to VCC, enabling flexible interfacing with logic families up to +5.5V via external pull-ups without backfeed.

Key Specifications

Pinout & Package

The MAX6338PUB+T is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), thermally enhanced with exposed pad (not electrically connected), compatible with standard reflow profiles and IPC-7351B footprint UMAX10_3X3_P050.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6340EUB+ and TPS3307-33DGNR, the MAX6338PUB+T uniquely supports -5.0V monitoring and one user-adjustable input - critical for mixed-signal systems requiring analog bias supervision and custom threshold flexibility without adding external components.

Availability

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

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

The MAX6338PUB+T belongs to Maxim's precision voltage supervisor product line, engineered for multirail power integrity verification in space-constrained, high-reliability systems where component count reduction and guaranteed temperature performance are critical.

FAQ

What is the exact threshold voltage for the -5.0V input on the MAX6338PUB+T?

The MAX6338PUB+T has a factory-programmed -5.0V input (IN4) with a +5% tolerance threshold, meaning it asserts its active-low output (OUT4) when the input rises to -4.75V. This is specified in the Electrical Characteristics table under "-5.0V (+5%) Threshold" with a typical value of -4.63V and min/max of -4.75V/-4.50V. The MAX6338PUB+T uses internal laser-trimmed resistors to achieve this accuracy across -40°C to +85°C.

Can the MAX6338PUB+T monitor a +2.5V rail?

No, the MAX6338PUB+T does not monitor +2.5V. Its factory-programmed inputs are fixed to +5.0V (IN1), +3.3V (IN2), adjustable (IN3), and -5.0V (IN4). Other variants like MAX6338IUB support +2.5V, but the PUB version replaces that with -5.0V. To supervise +2.5V, you would use the adjustable input (IN3) with an external resistor divider set to trip at +2.5V, referencing the internal 1.23V bandgap - though this requires design effort and calibration.

Does the MAX6338PUB+T require external pull-up resistors on its outputs?

The MAX6338PUB+T includes weak 10µA internal pull-ups to VCC on all four open-drain outputs (OUT1–OUT4), so external pull-ups are optional. However, if interfacing with logic operating above VCC (e.g., +5.5V) or requiring faster rise times, external pull-ups to the target logic voltage are recommended. The internal pull-ups ensure functional operation with no external components, satisfying the "no external components required" feature claim for basic use cases.

What is the purpose of the auxiliary (AUX) input on the MAX6338PUB+T?

The auxiliary input (IN3) on the MAX6338PUB+T provides direct access to the noninverting comparator terminal, allowing users to set a custom threshold voltage using an external resistor divider referenced to the internal 1.23V bandgap. This enables monitoring of nonstandard rails (e.g., +4.2V battery, +1.2V core) without additional ICs. Unlike the factory-set inputs, IN3's threshold is fully user-determined - making the MAX6338PUB+T adaptable to evolving power architecture requirements while retaining quad-channel integration.

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

The MAX6338PUB+T incorporates an internal undervoltage lockout circuit that forces all four outputs (OUT1–OUT4) low whenever VCC drops below +2.5V - the minimum operating voltage. This prevents erratic behavior during power ramp-up or brownout conditions. The UVLO remains active down to VCC = +1V (per Absolute Maximum Ratings), ensuring outputs stay asserted low even during deep undervoltage events. This behavior is intrinsic to the MAX6338PUB+T's architecture and requires no external components or configuration.