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 with 10µA internal pullup to VCC, monitors adjustable/3.3V/2.5V/adjustable supplies at ±2.0% threshold accuracy, and operates from 2.0V to 5.5V supply across –40°C to +85°C. It is used in desktop computers and networking equipment for reliable power sequencing and fault detection.

For engineers reviewing the MAX6709JUB datasheet, MAX6709JUB pinout, MAX6709JUB application, or MAX6709JUB equivalent, key selection criteria include factory-trimmed 3.3V and 2.5V thresholds with 5% tolerance, adjustable inputs down to 0.62V, 35µA typical supply current, and 10-pin µMAX package compatibility with wire-ORed power-good signaling.

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) and two adjustable inputs. Each input has built-in 0.3% threshold hysteresis and supports monitoring down to 0.62V via external resistor dividers.

It features undervoltage lockout that forces all PWRGD_ outputs low when VCC drops below 2.0V, and all four open-drain outputs are internally pulled up to VCC with 10µA current sources-enabling direct interface with 3.3V/5V logic and wire-OR configurations without external components.

Key Specifications

Pinout & Package

MAX6709JUB is housed in a 10-pin µMAX package (3mm × 3mm, 0.6mm height), RoHS-compliant, with exposed pad for thermal performance. Pin pitch is 0.5mm; package outline conforms to Maxim drawing 21-0061I (U10+2 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6710JUB and TPS3307-33D, the MAX6709JUB uniquely delivers four-channel supervision with two factory-optimized 5%-tolerance thresholds plus two fully adjustable inputs-all in a single 10-pin µMAX package with 35µA quiescent current, enabling compact, high-accuracy multirail validation without compromise.

Availability

MAX6709JUB is available at Aetrix Electronics and suitable for desktop computers, network switches, industrial PLCs, and medical imaging subsystems requiring stable component supply and long-term production continuity.

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 for multivoltage system reliability-specifically targeting applications where simultaneous, accurate monitoring of heterogeneous power rails is critical to functional safety and startup integrity.

FAQ

What is the exact threshold voltage for the 3.3V input on MAX6709JUB?

The IN2 pin of the MAX6709JUB is factory-trimmed for a 3.3V nominal supply with 5% tolerance, resulting in a guaranteed trip threshold of 3.15V (3.3V × 0.95). Electrical characteristics confirm a typical value of 3.08V and maximum of 3.15V at TA = +25°C, fully specified from –40°C to +85°C. This ensures robust detection of 3.3V rail collapse before downstream logic fails.

Can both adjustable inputs (IN1 and IN4) on MAX6709JUB monitor the same voltage rail?

Yes, both IN1 and IN4 on the MAX6709JUB can independently monitor the same voltage rail-for example, using identical resistor dividers-providing redundant fault detection. Each drives its own PWRGD output (PWRGD1 and PWRGD4), allowing separate interrupt handling or OR-ing into a single system-level power-good signal without cross-talk or timing skew.

Does MAX6709JUB require external pullup resistors for its open-drain outputs?

No, the MAX6709JUB integrates 10µA internal pullup current sources to VCC on all four PWRGD outputs. These are sufficient to drive standard CMOS/TTL inputs operating at VCC levels (2.0V–5.5V). External pullups are only needed when interfacing with logic running at voltages outside the VCC range-e.g., pulling PWRGD_ to a 1.8V domain-where internal sourcing is disabled and external resistors prevent reverse current.

How does the MAX6709JUB handle supply transients during power-up?

The MAX6709JUB is explicitly designed to be immune to supply transients, with built-in hysteresis (0.3% of threshold) and fast propagation delay (5µs typical). Its internal bandgap reference and comparator architecture reject short-duration spikes (<100ns) on monitored inputs. The undervoltage lockout circuit holds all outputs low until VCC stabilizes above 2.0V, preventing false assertions during ramp-up.

Is the MAX6709JUB pin-compatible with other variants in the MAX6709 family?

Yes, all MAX6709 variants-including MAX6709JUB-share identical 10-pin µMAX packaging and pinout. Differences lie solely in factory-trimmed threshold configurations (e.g., MAX6709AUB uses 5%/3.3V/2.5V/Adj*, while MAX6709JUB uses Adj*/3.3V/2.5V/Adj* with 5% tolerance). PCBs designed for one variant can accommodate others without layout changes, enabling late-stage BOM optimization.