Analog Devices Inc./Maxim Integrated MAX6899AALT+T

Overview

MAX6899AALT+T from Maxim Integrated is an ultra-small, low-power supervisory circuit with adjustable voltage monitoring and capacitor-programmable sequencing delay. It features an active-low enable input, active-high push-pull output, 0.5V fixed threshold (±1.8% over temperature), 1.5V–5.5V supply range, and operates across –40°C to +125°C. It is used in power-supply sequencing for multi-rail systems requiring precise timing control.

For engineers reviewing the MAX6899AALT+T datasheet, MAX6899AALT+T pinout, MAX6899AALT+T application, or MAX6899AALT+T equivalent, key selection considerations include its active-low enable logic, capacitor-adjustable IN-to-OUT delay (40µs to >1s), push-pull output drive capability, thermal performance in µDFN, and compatibility with automotive-grade sequencing requirements.

Technical Context

The MAX6899AALT+T implements a high-impedance monitor input (IN) with a fixed 0.5V rising threshold and 5mV hysteresis, enabling precise external voltage monitoring via resistive dividers. Its ENABLE pin is active-low, asserting output only when pulled low while IN exceeds VTH.

Delay timing is controlled by an internal 250nA current source charging an external capacitor (CDELAY) to 1.0V, yielding tDELAY = (CCDELAY × 4.0 × 10⁶) + 40µs. The push-pull output delivers VOH ≥ 0.8×VCC at 500µA and VOL ≤ 0.3V at 90µA, supporting direct interfacing with logic inputs without pull-ups.

Key Specifications

Pinout & Package

MAX6899AALT+T is housed in a 6-pin ultra-small µDFN package (1.0mm × 1.5mm, 0.5mm pitch), optimized for space-constrained PCB layouts and thermally efficient operation (θJA = 477°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory sequencing applications.

Compared with MAX6896AALT+T, MAX6899AALT+T provides compatible enable logic but eliminates need for external inversion to drive high-active loads; versus TLV809EADBZR, it delivers full sequencing flexibility, 0.5V threshold adaptability, and µDFN space savings at modest BOM cost increase.

Availability

MAX6899AALT+T is available at Aetrix Electronics and suitable for automotive power management, industrial sensor node supervision, and FPGA power sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for MAX6899AALT+T 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, automotive, and computing applications.

The MAX6895–MAX6899 product line was engineered specifically for ultra-compact, low-power voltage supervision and multi-stage power sequencing in space- and energy-constrained systems.

FAQ

What is the exact threshold voltage and tolerance of the MAX6899AALT+T?

The MAX6899AALT+T has a fixed input threshold voltage of 0.500V with ±1.8% accuracy over the full –40°C to +125°C operating temperature range. This specification is guaranteed by design and tested per Maxim's production flow, ensuring reliable detection of voltages as low as 0.491V (min) and up to 0.509V (max) across temperature and supply variations.

How does the CDELAY pin function in the MAX6899AALT+T?

The CDELAY pin in the MAX6899AALT+T connects to an external capacitor (CCDELAY) tied to GND. An internal 250nA current source charges this capacitor until it reaches 1.0V, at which point the output asserts. Delay time is calculated as tDELAY = (CCDELAY × 4.0 × 10⁶) + 40µs, enabling precise, user-defined timing from microseconds to over one second without external timing components beyond the capacitor.

Can the MAX6899AALT+T operate with a 1.2V supply?

No - the MAX6899AALT+T requires a minimum VCC of 1.5V to guarantee correct operation and 1.8% threshold accuracy. Below 1.5V, the device enters undervoltage lockout (UVLO); output behavior becomes undefined when VCC falls below 1.2V. For 1.2V system monitoring, use an external resistor divider to scale the monitored voltage to meet the 0.5V IN threshold while powering MAX6899AALT+T from a ≥1.5V rail.

What is the maximum sink/source current capability of the MAX6899AALT+T output?

The MAX6899AALT+T push-pull output guarantees VOL ≤ 0.3V when sinking 90µA (at VCC ≥ 1.2V) and VOH ≥ 0.8×VCC when sourcing 500µA (at VCC ≥ 2.25V). Absolute maximum output current is ±20mA per pin, but sustained operation above 1mA is not recommended due to thermal limits in the µDFN package.

Is the MAX6899AALT+T AEC-Q100 qualified?

The MAX6899AALT+T itself is not individually listed in the AEC-Q100 qualification documentation; however, the MAX6895–MAX6899 family includes AEC-Q100-qualified variants (e.g., MAX6896AAZT/V+T, MAX6895AAZT/V+T, MAX6897AAZT/V+). While MAX6899AALT+T shares identical die, process (BiCMOS), and µDFN packaging with qualified siblings, formal automotive qualification applies only to designated /V+ marked parts.