Analog Devices Inc./Maxim Integrated MAX6897AAZT+T

Overview

MAX6897AAZT+T from Maxim Integrated is an ultra-small, low-power, adjustable-voltage supervisory circuit with active-high enable and active-high open-drain output, designed for power-supply sequencing and reset control in automotive and industrial systems. It monitors input voltages down to 0.5V with ±5mV hysteresis, supports 1.5V–5.5V supply, delivers 10µA typical supply current, and provides capacitor-adjustable delay (40µs to >1s) via external CDELAY pin.

For engineers reviewing the MAX6897AAZT+T datasheet, MAX6897AAZT+T pinout, MAX6897AAZT+T application, or MAX6897AAZT+T equivalent, key selection criteria include its AEC-Q100 qualification, 28V-tolerant open-drain output, -40°C to +125°C operation, and precise 0.5V threshold with 1.8% accuracy over temperature.

Technical Context

The MAX6897AAZT+T implements a fixed 0.5V internal reference with high-impedance IN input (±15nA leakage), enabling accurate monitoring of external rail voltages via resistive dividers. Its ENABLE pin is active-high, and output assertion follows a capacitor-programmable delay after both VIN > 0.5V and ENABLE = high - not a fixed propagation delay.

Unlike P-version variants, the "A" suffix confirms adjustable timing: tDELAY = (CCDELAY × 4.0 × 10⁶) + 40µs, where CCDELAY connects between CDELAY and GND. The open-drain OUT requires an external pullup and tolerates up to 28V, supporting level-shifting and higher-voltage system interfaces.

Key Specifications

Pinout & Package

MAX6897AAZT+T is housed in a 6-pin thin SOT23 package (1.60mm × 2.90mm), optimized for space-constrained PCB layouts and compatible with standard SOT23 reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring and sequencing applications.

Compared with MAX6895AAZT+T, MAX6897AAZT+T adds 28V-tolerant open-drain flexibility at identical sequencing precision and AEC-Q100 qualification; compared with TLV809E33DBZR, it offers full programmability, cascading, and automotive-grade reliability - making it superior for multi-rail, safety-critical designs.

Availability

MAX6897AAZT+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and medical instrumentation requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant supervision.

Supply support for MAX6897AAZT+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 and mixed-signal ICs for demanding industrial, automotive, and computing applications.

The MAX6895–MAX6899 family was engineered specifically for compact, low-power power-supply sequencing and supervisory functions in harsh-environment systems - prioritizing accuracy, temperature stability, and package miniaturization.

FAQ

What is the exact threshold voltage and tolerance of MAX6897AAZT+T?

The MAX6897AAZT+T features a fixed 0.5V internal threshold with ±1.8% accuracy over the full -40°C to +125°C operating temperature range. Measured hysteresis is 5mV (0.495V falling threshold), ensuring stable operation during slow supply transitions. This specification is guaranteed per Maxim's Electrical Characteristics table and does not require external calibration.

Does MAX6897AAZT+T support AEC-Q100 qualification, and which grade?

Yes, MAX6897AAZT+T is AEC-Q100 qualified per the datasheet's Features section and Ordering Information table (marked "MAX6897AAZT/V+"). It meets Grade 2 requirements (-40°C to +105°C ambient, +125°C junction), validated for automotive body electronics, infotainment, and ADAS subsystems.

How is the delay time calculated for MAX6897AAZT+T using the CDELAY pin?

For MAX6897AAZT+T, delay time from IN rising above 0.5V (with ENABLE high) to OUT assertion is calculated as tDELAY = (CCDELAY × 4.0 × 10⁶) + 40µs, where CCDELAY is the capacitor value in farads. For example, a 100nF capacitor yields ~400ms delay. The 40µs offset is a fixed internal propagation term confirmed in the Timing Characteristics table.

What is the maximum voltage the OUT pin of MAX6897AAZT+T can tolerate?

The OUT pin of MAX6897AAZT+T is rated for up to 28V when in high-impedance (deasserted) state, as specified in the Absolute Maximum Ratings table. This 28V tolerance applies regardless of VCC (1.5V–5.5V), enabling safe use with external pullups to higher-voltage rails - a key differentiator from push-pull-output variants.

Can MAX6897AAZT+T be used to monitor a 1.2V rail, and how is the resistor divider designed?

Yes, MAX6897AAZT+T can monitor a 1.2V rail using an external resistive divider on the IN pin. With a fixed 0.5V threshold, select R2 = 1MΩ (typical), then calculate R1 = R2 × ((VMONITOR / 0.5) − 1) = 1MΩ × ((1.2 / 0.5) − 1) ≈ 1.4MΩ. Input leakage ≤±15nA ensures minimal divider error even with high-value resistors.