Analog Devices Inc./Maxim Integrated MAX6465XR23+T

Overview

MAX6465XR23+T from Maxim Integrated is a micropower supervisory circuit with active-high push-pull output, 2.30V lower trip threshold (VTH−), and 150ms minimum reset timeout period. It monitors VCC supply voltage in battery-powered systems, asserts reset during undervoltage conditions, and holds reset for ≥150ms after recovery to ensure reliable µP initialization. Designed for portable medical devices and cellular handsets requiring ultra-low quiescent current.

For engineers reviewing the MAX6465XR23+T datasheet, MAX6465XR23+T pinout, MAX6465XR23+T application, or MAX6465XR23+T equivalent, key selection criteria include guaranteed 150ms reset timeout, ±2.5% threshold accuracy over −40°C to +125°C, 1.0µA supply current at 3.6V, SC70-3 package compatibility, and immunity to short VCC transients.

Technical Context

The MAX6465XR23+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 2.30V (±2.5% over temperature) and VTH+ = VTH− × 1.05 = 2.415V. Its internal hysteresis prevents output chatter near threshold crossings.

This device belongs to the MAX6464–MAX6466 subgroup, providing a minimum 150ms reset timeout after VCC rises above VTH+, independent of propagation delay. Output remains asserted high for ≥150ms post-recovery, ensuring robust microprocessor reset sequencing in low-power embedded systems.

Key Specifications

Pinout & Package

MAX6465XR23+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is OUT (active-high push-pull), Pin 2 is GND, and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6465XR23+T, the MAX6465UR23+T offers identical electrical specs but in a thermally robust SOT23-3 package, while TPS3808G125DBVR provides manual reset and longer timeout at the cost of threshold flexibility and package size - making MAX6465XR23+T optimal for space- and current-constrained 2.3V supervision.

Availability

MAX6465XR23+T is available at Aetrix Electronics and suitable for portable medical devices, cellular handsets, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6465XR23+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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage monitoring and µP reset supervision in battery-critical systems, targeting applications where supply current, accuracy, and small footprint are non-negotiable.

FAQ

What is the exact voltage threshold of MAX6465XR23+T?

The MAX6465XR23+T has a factory-set lower trip threshold (VTH−) of 2.30V, with ±2.5% accuracy over the full −40°C to +125°C operating range. Its upper threshold (VTH+) is 2.415V (VTH− × 1.05), providing 5% internal hysteresis to prevent output oscillation near the trip point. These values are confirmed in Table 1a and Table 1b of the official datasheet.

Does MAX6465XR23+T require external components to function?

No, MAX6465XR23+T operates autonomously with no external components required. Its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. The active-high push-pull output drives logic inputs directly - eliminating the need for pullup resistors, timing capacitors, or voltage dividers typically used in discrete reset circuits.

How does the 150ms reset timeout of MAX6465XR23+T behave during power-up?

During power-up, MAX6465XR23+T asserts its active-high output only after VCC rises above VTH+ (2.415V) and then holds it high for a minimum of 150ms. This ensures the microcontroller receives a clean, extended reset pulse regardless of VCC ramp rate - satisfying boot requirements for most ARM Cortex-M and RISC-V MCUs that need ≥100ms reset assertion.

Can MAX6465XR23+T monitor voltages below 1.6V?

No, MAX6465XR23+T is specified for monitoring voltages from +1.6V to +5.5V in 100mV increments. Its absolute minimum operating voltage is +1.2V, but the 2.30V threshold variant is not designed or characterized for reliable operation below 1.6V. For sub-1.6V supervision, alternative devices such as the MAX6469 series would be required.

Is MAX6465XR23+T compatible with lead-free PCB assembly processes?

Yes, MAX6465XR23+T uses lead-free packaging, as indicated by the "+T" suffix per Maxim's ordering convention. It is rated for lead-free reflow profiles including peak temperatures up to +260°C and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), enabling standard Pb-free manufacturing without special handling.