Analog Devices Inc./Maxim Integrated MAX6887DETE+

Overview

The MAX6887DETE+ from Maxim Integrated is a hex-voltage supervisory IC with six factory-set undervoltage/overvoltage detector inputs, active-low open-drain RESET/OV/WDO outputs, 1% threshold accuracy, and dual-mode watchdog timer (102.4s initial / 1.6s normal timeout). It monitors 3.3V, 2.5V, 1.8V, and 1.5V rails in multivoltage server and telecom power systems.

For engineers reviewing the MAX6887DETE+ datasheet, MAX6887DETE+ pinout, MAX6887DETE+ application, or MAX6887DETE+ equivalent, this page delivers verified specifications, exact pin functions, real-world timing behavior, and validated alternative options for supply monitoring in high-reliability embedded systems.

Technical Context

The MAX6887DETE+ implements six independent voltage detectors with matched ±1% threshold accuracy over –40°C to +85°C, each providing simultaneous undervoltage and overvoltage detection. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to self-power internal circuitry, eliminating need for external VCC bias in most configurations.

It integrates a two-phase watchdog timer with 102.4s initial timeout for µP initialization and 1.6s normal timeout for runtime supervision. All three outputs-RESET (200ms timeout), OV (25µs timeout), and WDO-are active-low, open-drain, requiring external pullups and supporting wired-OR logic interfacing with microcontrollers and PMICs.

Key Specifications

Pinout & Package

MAX6887DETE+ uses a 16-pin 5mm × 5mm × 0.8mm thin QFN package with exposed thermal pad (EP) internally connected to GND. The package is RoHS-compliant and optimized for automated assembly and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply supervisory applications.

Compared with MAX6888DETE+, the MAX6887DETE+ provides two additional detector inputs for expanded rail coverage without layout change, while TPS386000RGPT trades fixed thresholds and integrated watchdog for programmability - making MAX6887DETE+ optimal for standardized 3.3V/2.5V/1.8V/1.5V server and telecom platforms.

Availability

MAX6887DETE+ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, and industrial PLC backplane applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6887DETE+ 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, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.

The MAX6887/MAX6888 family was engineered specifically for multivoltage system supervision in high-availability infrastructure equipment - delivering factory-trimmed accuracy, dual-mode watchdog timing, and self-powered operation without external bias.

FAQ

What are the exact undervoltage and overvoltage thresholds for MAX6887DETE+ on each input?

The MAX6887DETE+ has factory-set thresholds: IN1 = 3.06V UV / 3.54V OV; IN2 = 2.31V UV / 2.68V OV; IN3 = 1.67V UV / 1.93V OV; IN4 = 1.39V UV / 1.61V OV; IN5 = 0.557V UV / 0.643V OV; IN6 = 0.557V UV / 0.643V OV. These values are guaranteed ±1% over –40°C to +85°C and are listed in Table 1 of the MAX6887 datasheet. The MAX6887DETE+ does not support user-adjustable thresholds on these fixed inputs.

Can MAX6887DETE+ be powered solely from IN1–IN4, or is an external VCC required?

MAX6887DETE+ can be powered solely from IN1–IN4 using its internal virtual diode-OR architecture - no external VCC is required. The device automatically selects the highest voltage among IN1–IN4 (≥2.7V) to power internal circuitry. VCC is an internal node, not an input; it must be bypassed with 1µF to GND but should never be driven externally unless all IN_ inputs are configured as "Adj" per datasheet Section "Powering the MAX6887/MAX6888".

How does the watchdog timer in MAX6887DETE+ behave during power-up and runtime?

At power-up, MAX6887DETE+ enters initial watchdog mode with 102.4s timeout (92.16–112.64s range), allowing µP initialization. After first WDI toggle, it switches to normal 1.6s timeout (1.44–1.76s range). If WDI fails to toggle within timeout, WDO asserts low. When WDO is connected to MR, MAX6887DETE+ generates a 200ms RESET pulse - clearing the watchdog and restarting the cycle. This dual-mode behavior is intrinsic to MAX6887DETE+ and requires no configuration.

Is the exposed pad (EP) on MAX6887DETE+ electrically connected, and how should it be handled?

Yes, the exposed pad (EP) on MAX6887DETE+ is internally connected to GND. It must be soldered to a PCB copper pour tied to system ground for optimal thermal performance and electrical noise immunity. Leaving EP unconnected degrades thermal resistance by >30% and increases susceptibility to ESD events. The MAX6887DETE+ datasheet (Package Information section) confirms EP = GND and recommends minimum 4×4 array of thermal vias under the pad.

Does MAX6887DETE+ support margin testing, and how is it implemented?

Yes, MAX6887DETE+ supports margin testing via the MARGIN pin. When pulled low, MARGIN freezes the state of RESET, OV, and WDO outputs regardless of subsequent voltage faults or watchdog timeouts - enabling safe over/under-voltage stress testing of power rails. MARGIN is internally pulled up to BP (2.55V) via a 10µA current source and overrides MR if both are asserted. This function is fully implemented in silicon and requires no external components for basic operation.