Analog Devices Inc./Maxim Integrated MAX6709EUB

Overview

The MAX6709EUB from Maxim Integrated is a low-power, quad voltage monitor IC designed for multivoltage system supervision. It monitors four independent supply rails-adjustable (IN1), 3.3V (IN2), 2.5V (IN3), and 1.8V (IN4)-each with factory-trimmed ±2.0% threshold accuracy and 10% tolerance support. With 35µA typical supply current, 2.0V–5.5V operating range, and four independent open-drain PWRGD outputs, it enables reliable power-good signaling in space-constrained embedded systems.

For engineers reviewing the MAX6709EUB datasheet, MAX6709EUB pinout, MAX6709EUB application, or MAX6709EUB equivalent, this device delivers precise, component-free monitoring of mixed-voltage domains in telecom infrastructure, server power management, and industrial computing-where supply sequencing, undervoltage lockout, and wire-ORed status aggregation are critical.

Technical Context

The MAX6709EUB integrates four high-input-impedance comparators, an internal 0.62V bandgap reference, and precision resistor-divider networks to set nominal thresholds for IN2 (3.3V), IN3 (2.5V), and IN4 (1.8V), while IN1 supports adjustable monitoring down to 0.609V via external divider. Each comparator features built-in 0.3% threshold hysteresis to reject noise without external components.

All four PWRGD outputs are active-low, open-drain with 10µA internal pullup to VCC, enabling direct wire-OR connection and compatibility with logic supplies up to 5.5V. An undervoltage lockout circuit forces all outputs low when VCC drops below 2.0V, ensuring deterministic behavior across the full –40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (3mm × 3mm, 0.5mm pitch), RoHS-compliant, exposed pad optional. Pin 5 is GND; Pin 10 is VCC; Pins 1–4 and 6–9 serve as inputs and outputs per configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-33D and ADM1085AKSZ-REEL7, the MAX6709EUB uniquely delivers four factory-set thresholds-including 1.8V and adjustable-in a single µMAX package with lowest ICC (35µA) and guaranteed ±2.0% accuracy across temperature, making it optimal for space- and power-constrained multivoltage systems.

Availability

MAX6709EUB is available at Aetrix Electronics and suitable for telecommunications infrastructure, server power management, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6709EUB 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 design house specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6709EUB belongs to Maxim's precision voltage supervisor product line, engineered specifically for multivoltage system power integrity-delivering accurate, low-power, and pin-efficient monitoring where supply sequencing and fault isolation are mission-critical.

FAQ

What is the function of the IN1 pin on the MAX6709EUB?

The IN1 pin on the MAX6709EUB is an adjustable voltage monitor input referenced to an internal 0.62V threshold. When used with an external resistor divider, it enables precise supervision of custom supply voltages such as 1.2V, 1.5V, or 5.0V. Unlike the fixed-threshold inputs (IN2–IN4), IN1 requires no factory trimming and supports monitoring down to 0.609V, making the MAX6709EUB adaptable to nonstandard rail voltages without additional components.

Does the MAX6709EUB provide reset timing or manual reset capability?

No, the MAX6709EUB does not include reset timing or manual reset (MR) functionality. It is a pure quad voltage monitor with four independent PWRGD outputs. For integrated reset timing and MR support, Maxim offers the pin-compatible MAX6714 series. The MAX6709EUB must be paired with an external reset controller or microcontroller GPIO to implement timed reset assertion-its role is strictly supply voltage validation and status indication.

What is the maximum sink current supported by the PWRGD outputs of the MAX6709EUB?

The PWRGD outputs of the MAX6709EUB are open-drain and specified to sink up to 2mA while maintaining VOL ≤ 0.3V at VCC = 5V. This rating ensures robust interfacing with standard CMOS and TTL inputs, FPGA configuration pins, and microcontroller reset lines. The 10µA internal pullup remains active during sinking, allowing bidirectional signal arbitration in wire-OR configurations without external components.

Can the MAX6709EUB monitor a 5.0V supply?

The MAX6709EUB variant EUB is configured for adjustable/3.3V/2.5V/1.8V monitoring and does not include a factory-trimmed 5.0V threshold. To monitor a 5.0V rail, use the IN1 adjustable input with a resistor divider (e.g., R1 = 6.8kΩ, R2 = 1.0kΩ) to scale 5.0V down to ~0.62V. Alternatively, select MAX6709AUB or MAX6709BUB, which feature fixed 5.0V monitoring on IN1-confirming that MAX6709EUB itself does not natively support 5.0V without external scaling.

Is the MAX6709EUB RoHS-compliant and available in lead-free packaging?

Yes, the MAX6709EUB is available in RoHS-compliant, lead-free packaging. Per Maxim's ordering information, the suffix "+" (e.g., MAX6709EUB+) denotes lead-free construction, and tape-and-reel variants (e.g., MAX6709EUB+T) are also offered. The µMAX package uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), supporting standard reflow profiles without special handling requirements for the MAX6709EUB.