Analog Devices Inc./Maxim Integrated MAX6709CUB+

Overview

The MAX6709CUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, providing four independent active-low open-drain power-good outputs with factory-trimmed thresholds for 5.0V, 3.3V, 1.8V, and adjustable inputs (down to 0.62V), ±2.0% threshold accuracy, 35µA typical supply current, and operation from 2.0V to 5.5V - used in desktop computers and telecom equipment for reliable power sequencing and fault detection.

For engineers reviewing the MAX6709CUB+ datasheet, MAX6709CUB+ pinout, MAX6709CUB+ application, or MAX6709CUB+ equivalent, this page delivers verified electrical specifications, µMAX package layout, real-world use scenarios, and validated alternative options for multivoltage monitoring designs requiring precision, low quiescent current, and extended temperature support (-40°C to +85°C).

Technical Context

The MAX6709CUB+ integrates four precision comparators with an internal 0.62V bandgap reference and factory-laser-trimmed resistor-divider networks to deliver fixed thresholds for IN1 = 5.0V (-10%), IN2 = 3.3V (-10%), IN3 = 1.8V (-10%), and IN4 = adjustable (0.62V base). Each input drives an independent open-drain PWRGD_ output with 10µA internal pullup to VCC.

It features built-in 0.3% threshold hysteresis, immunity to supply transients up to 100µs at 100mV overdrive, undervoltage lockout that forces all outputs low below 2.0V VCC, and wire-ORable outputs compatible with logic supplies from 0V to 5.5V - enabling flexible power-good aggregation without external components.

Key Specifications

Pinout & Package

Package: 10-pin µMAX (3.0mm × 3.0mm, 0.6mm height), exposed pad optional, lead-free per + suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6708CUB+, the MAX6709CUB+ provides correct -10% thresholds for legacy 5V/3.3V/1.8V rails; compared with TPS3307-33DGNR, it delivers true quad integration in same footprint without external components or current penalty.

Availability

MAX6709CUB+ is available at Aetrix Electronics and suitable for desktop computers, telecommunications infrastructure, and industrial PLCs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX6709CUB+ 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) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications - serving industrial, automotive, communications, and computing markets.

The MAX6709CUB+ belongs to Maxim's voltage supervisor product line, engineered specifically for multivoltage system reliability in space- and power-constrained environments where accuracy, low IQ, and guaranteed reset timing are critical.

FAQ

What is the function of the IN4 pin on the MAX6709CUB+?

The IN4 pin on the MAX6709CUB+ is an adjustable-threshold input with a nominal internal reference of 0.623V. It accepts an external resistor divider to monitor custom supply voltages (e.g., 2.8V, 1.2V) - unlike IN1–IN3, which are factory-set for 5.0V, 3.3V, and 1.8V at -10% tolerance. This flexibility makes the MAX6709CUB+ adaptable across diverse rail configurations without redesigning the supervisor section.

Does the MAX6709CUB+ provide reset timing or manual reset capability?

No, the MAX6709CUB+ does not include reset timing or manual reset (MR) functionality. Those features are exclusive to the MAX6714 family. The MAX6709CUB+ provides only four independent PWRGD_ outputs with no integrated timeout or MR input - it is strictly a quad power-good monitor. For reset generation, external logic or a companion device like the MAX6714CUB+ is required.

Can the MAX6709CUB+ monitor a 2.5V supply?

No, the MAX6709CUB+ variant specifically configures IN1 = 5.0V, IN2 = 3.3V, IN3 = 1.8V, and IN4 = adjustable - it does not support factory-set 2.5V monitoring. To supervise a 2.5V rail, use IN4 with an external resistor divider (e.g., R1 = 294kΩ, R2 = 100kΩ yields ~2.5V threshold), or select MAX6709AUB+/BUB+ which include 2.5V as IN3.

What is the maximum sink current supported by each PWRGD_ output of the MAX6709CUB+?

Each PWRGD_ output of the MAX6709CUB+ supports a minimum sink current of 2mA at VOL ≤ 0.3V (tested at VCC = 5V, ISINK = 2mA). This allows direct interfacing with standard TTL/CMOS inputs and driving small LEDs or optocouplers without external buffers - sufficient for most power-good signaling and fault flagging applications.

Is the MAX6709CUB+ pin-compatible with other MAX6709 variants?

Yes, all MAX6709 variants (e.g., MAX6709AUB+, MAX6709BUB+, MAX6709CUB+) share identical 10-pin µMAX pinout and package dimensions. Only the factory-trimmed threshold voltages differ between part numbers - meaning PCB layout, decoupling, and interconnect remain unchanged across the MAX6709 family, simplifying design reuse and BOM rationalization.