Analog Devices Inc./Maxim Integrated MAX6709OUB

Overview

MAX6709OUB from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, featuring four independent adjustable-threshold inputs (each referenced to 0.62 V internal bandgap), four active-low open-drain PWRGD outputs with 10 µA internal pullup to VCC, 35 µA typical supply current, and operation across 2.0 V to 5.5 V supply range. It enables precise power-good monitoring in telecom servers and high-end computing platforms where flexible, component-free voltage threshold configuration is required.

For engineers reviewing the MAX6709OUB datasheet, MAX6709OUB pinout, MAX6709OUB application, or MAX6709OUB equivalent, this device supports wire-ORed power-good signaling, operates over –40°C to +85°C, provides ±2.0% threshold accuracy, integrates hysteresis (0.3×VTH), and delivers low-noise immunity without external resistors - critical for stable reset sequencing in dense PCB layouts.

Technical Context

The MAX6709OUB implements four matched high-input-impedance comparators tied to an internally trimmed 0.62 V reference, enabling user-defined thresholds via external resistor dividers on all four inputs. Its architecture eliminates need for external precision resistors while maintaining ±2.0% threshold accuracy and 60 ppm/°C temperature coefficient across the full operating range.

All four outputs are independent, active-low, open-drain signals with weak 10 µA internal pullups to VCC - supporting logic-level translation, wire-ORing, and compatibility with 0–5.5 V external pullup voltages. An integrated undervoltage lockout forces outputs low when VCC drops below 2.0 V, ensuring deterministic behavior during brownout conditions.

Key Specifications

Pinout & Package

MAX6709OUB is housed in a 10-pin µMAX package (3 mm × 3 mm, 0.8 mm height), RoHS-compliant variant U10+2 per Maxim drawing 21-0061I, with exposed pad for thermal enhancement and standard lead pitch of 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6714OUB and TPS3307-33D, the MAX6709OUB uniquely delivers four fully adjustable inputs with internal pullups and lowest quiescent current - making it optimal for compact, multirail power-good architectures requiring minimal external components.

Availability

MAX6709OUB is available at Aetrix Electronics and suitable for telecom infrastructure, server power management, and high-end printing equipment requiring stable component supply, long-lifecycle assurance, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6709OUB 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 MAX6709 belongs to Maxim's precision voltage supervisor product line, engineered specifically for multivoltage system power integrity verification - emphasizing low ICC, factory-trimmed accuracy, and flexible threshold configuration without external components.

FAQ

What is the exact threshold voltage supported by MAX6709OUB?

The MAX6709OUB does not have fixed thresholds: all four inputs (IN1–IN4) are adjustable and referenced to an internal 0.62 V bandgap. External resistor dividers set the actual trip point - e.g., a 10 kΩ/1.24 kΩ divider yields 5.0 V threshold. The device guarantees ±2.0% accuracy and 60 ppm/°C drift over –40°C to +85°C. MAX6709OUB supports monitoring down to 0.62 V directly or higher voltages via scaling.

Does MAX6709OUB include internal pullup resistors on its outputs?

Yes, MAX6709OUB integrates 10 µA constant-current internal pullups to VCC on all four PWRGD outputs (PWRGD1–PWRGD4). These eliminate need for external pullup resistors in most 1.8 V–5.5 V logic interfaces. The internal pullups can be overdriven by external resistors connected to different voltage domains - internal circuitry prevents reverse current flow into VCC. MAX6709OUB's pullup design enables direct wire-ORing of outputs.

Can MAX6709OUB monitor a 1.2 V supply?

Yes, MAX6709OUB can monitor a 1.2 V supply using an external resistor divider on any input (IN1–IN4). Since the internal reference is 0.62 V, a simple 1:1 divider (e.g., two equal resistors) scales 1.2 V down to 0.6 V - within the 0.609 V to 0.635 V specified threshold window. The MAX6709OUB datasheet confirms adjustable threshold operation down to 0.62 V, and the device maintains ±2.0% accuracy across temperature. No additional components beyond the divider are needed.

What is the operating temperature range for MAX6709OUB?

MAX6709OUB is fully specified for operation from –40°C to +85°C ambient temperature. All electrical characteristics - including threshold accuracy (±2.0%), supply current (35 µA typ), propagation delay (5 µs), and hysteresis (0.3×VTH) - are guaranteed across this extended industrial temperature range. The µMAX package (U10+2) used for MAX6709OUB-TG05 is qualified for this range, and the internal bandgap reference ensures stable performance without derating.

How does MAX6709OUB handle supply transients?

MAX6709OUB incorporates design features that make it immune to typical supply transients: built-in hysteresis (0.3×VTH) prevents output chatter during slow or noisy voltage crossings, and the comparator input structure rejects fast spikes up to 100 ns duration. The device also includes an undervoltage lockout (UVLO) that forces all outputs low when VCC drops below 2.0 V - ensuring clean, deterministic behavior during brownouts. MAX6709OUB's 35 µA supply current further minimizes coupling paths for transient injection.