Analog Devices Inc./Maxim Integrated MAX6709JUB+

Overview

The MAX6709JUB+ from Maxim Integrated is a low-power, quad voltage monitor IC designed for multivoltage system supervision. It provides four independent active-low open-drain power-good outputs (PWRGD1–PWRGD4), monitors 3.3V and 2.5V nominal supplies with ±5% tolerance, supports two adjustable inputs (0.62V internal reference), consumes only 35µA typical supply current, and operates from 2.0V to 5.5V over –40°C to +85°C - used in desktop/notebook computers and telecom equipment for reliable power sequencing and fault detection.

For engineers reviewing the MAX6709JUB+ datasheet, MAX6709JUB+ pinout, MAX6709JUB+ application, or MAX6709JUB+ equivalent, this page delivers verified electrical parameters, µMAX package layout, real-world use scenarios, and validated alternative options - all aligned to the MAX6709 family's factory-trimmed threshold architecture and wire-ORable output design.

Technical Context

The MAX6709JUB+ implements four precision comparators with an internal 0.62V bandgap reference and factory-trimmed resistor-divider networks for fixed thresholds (3.3V, 2.5V), while two inputs are configured as adjustable via external dividers. Each comparator drives an independent open-drain output with 10µA internal pullup to VCC, enabling direct wire-OR connection without external components.

Hysteresis is built-in at 0.3% of threshold voltage, eliminating need for external feedback resistors. An undervoltage lockout circuit forces all PWRGD_ outputs low when VCC drops below 2.0V, and the device remains functional down to 1V with guaranteed behavior across –40°C to +85°C.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (3.0mm × 3.0mm, 0.6mm height, exposed pad), lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6709FUB+, the MAX6709JUB+ trades 1.8V monitoring for dual adjustable inputs - enabling broader rail coverage in compact multivoltage systems. Versus TPS3307-33DGNR, it adds one channel, two adjustable thresholds, and µMAX footprint efficiency - critical for space-constrained computing and telecom boards.

Availability

MAX6709JUB+ is available at Aetrix Electronics and suitable for desktop computers, telecommunications infrastructure, and industrial embedded gateways requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6709JUB+ 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, computing, and communications markets.

The MAX6709JUB+ belongs to Maxim's precision voltage supervisor product line, engineered specifically for multivoltage system power integrity - delivering accurate, low-power, and pin-efficient monitoring in space-constrained computing and telecom platforms.

FAQ

What is the function of the adjustable inputs on the MAX6709JUB+?

The MAX6709JUB+ features two adjustable inputs (IN1 and IN4) tied to an internal 0.62V reference. By connecting external resistor dividers, engineers can monitor any supply voltage ≥0.62V - for example, setting IN1 to supervise a 1.2V rail using R1=110kΩ and R2=100kΩ. This flexibility eliminates the need for additional supervisory ICs in mixed-voltage designs and is confirmed in the MAX6709 selector guide for part number MAX6709JUB+.

Does the MAX6709JUB+ provide reset timing or a built-in reset delay?

No, the MAX6709JUB+ does not include reset timing or a built-in reset timeout period. It is a pure quad voltage monitor with four independent open-drain PWRGD outputs - unlike the MAX6714 series, which integrates a 140ms min reset timeout. The MAX6709JUB+ asserts outputs immediately upon threshold breach (typical propagation delay 5µs), making it suitable for applications requiring instantaneous power-good signaling without delay, as specified in the MAX6709JUB+ electrical characteristics table.

What is the maximum sink current supported by the MAX6709JUB+ outputs?

The MAX6709JUB+ open-drain outputs support up to 2mA sink current while maintaining VOL ≤ 0.3V at VCC = 5V, and 1.2mA at VCC = 2.5V - per the Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct interfacing with standard CMOS/TTL inputs and driving small LEDs (with series resistor) without external buffer stages, as verified in the MAX6709JUB+ datasheet Figure 3 and Table 1.

Can unused inputs on the MAX6709JUB+ be left floating?

No - unused adjustable inputs (IN1 or IN4) on the MAX6709JUB+ must be connected to GND to prevent undefined comparator behavior and leakage-induced false trips. Fixed inputs (IN2 = 3.3V, IN3 = 2.5V) are internally terminated and may remain unconnected if unused, but grounding adjustable pins is mandatory per the Applications Information section of the MAX6709JUB+ datasheet.

Is the MAX6709JUB+ pin-compatible with other MAX6709 variants like MAX6709BUB+?

Yes, all MAX6709 variants including MAX6709JUB+ and MAX6709BUB+ share identical 10-pin µMAX packaging and pinout - differing only in factory-trimmed threshold configurations. This allows drop-in replacement during design iteration or qualification, provided the voltage monitoring requirements match the selected variant's IN1–IN4 assignments as defined in the MAX6709 selector guide.