Analog Devices Inc./Maxim Integrated MAX6464UK31+T

Overview

MAX6464UK31+T from Maxim Integrated is a micropower supervisory circuit with active-high push-pull output, 3.1V nominal reset threshold (VTH− = 3.100V), 150ms minimum reset timeout period, and ±2.5% threshold accuracy over −40°C to +125°C. It monitors VCC supply voltage in battery-powered microcontroller systems and asserts a clean, glitch-immune reset signal during brownout conditions.

For engineers reviewing the MAX6464UK31+T datasheet, MAX6464UK31+T pinout, MAX6464UK31+T application, or MAX6464UK31+T equivalent, key selection criteria include guaranteed 150ms reset assertion time after VCC recovery, ultra-low 1.0µA supply current at 3.6V, internal 5% hysteresis (VTH+ = 3.255V), and compatibility with SOT23-5 footprint for space-constrained embedded designs.

Technical Context

The MAX6464UK31+T implements a precision bandgap reference and comparator with factory-trimmed resistor networks to set its 3.1V lower trip point (VTH−) and 3.255V upper trip point (VTH+). Its internal timeout circuit ensures reset remains asserted for ≥150ms after VCC rises above VTH+, independent of input slew rate.

This device uses BiCMOS process technology and integrates hysteresis, transient immunity, and no external components-enabling reliable µP reset generation in low-voltage, wide-temperature industrial and portable applications without calibration or trimming.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint, rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6464UK31+T, MAX6465UK31+T offers identical supervision performance but requires MCU-level logic inversion, while TLV803EB31DBVR trades threshold accuracy and dual-GND noise immunity for lower cost and smaller footprint-making MAX6464UK31+T optimal for industrial-grade reliability where active-high reset is preferred.

Availability

MAX6464UK31+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6464UK31+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power, high-accuracy voltage supervision in battery-operated and thermally demanding embedded systems-replacing discrete reset solutions with integrated, calibrated functionality.

FAQ

What is the exact reset threshold voltage of the MAX6464UK31+T?

The MAX6464UK31+T has a nominal lower trip threshold (VTH−) of 3.100V at +25°C, with guaranteed tolerance of ±2.5% over −40°C to +125°C (i.e., 3.023V to 3.178V). Its upper trip point (VTH+) is fixed at VTH− × 1.05 = 3.255V, providing 5% hysteresis to prevent oscillation near the threshold. This specification is factory-trimmed and does not require external calibration.

Does the MAX6464UK31+T require external components to function?

No, the MAX6464UK31+T requires no external components for basic operation. Its precision bandgap reference, comparator, trimmed resistor network, and timeout circuit are fully integrated. Unlike discrete reset ICs, it eliminates the need for external pull-up resistors (due to push-pull output), timing capacitors (due to internal 150ms timer), or voltage-divider networks (due to factory-set 3.1V threshold).

How does the MAX6464UK31+T handle short voltage transients on the VCC line?

The MAX6464UK31+T is immune to short-duration falling VCC transients: it will not assert reset for glitches shorter than ~10–20µs, depending on amplitude. For example, a 200mV dip below VTH− is rejected if duration is under 15µs (per Typical Operating Characteristics Figure 4). This transient immunity prevents false resets during switching noise or ESD events without compromising brownout detection sensitivity.

What is the purpose of the two GND pins on the MAX6464UK31+T SOT23-5 package?

The MAX6464UK31+T uses two dedicated GND pins (pins 2 and 4) in its SOT23-5 package to separate analog ground return paths and reduce ground bounce. Both pins must be connected to the same low-impedance system ground plane. This dual-GND configuration improves threshold accuracy and noise immunity-especially critical in high-noise industrial or automotive environments where supply rail integrity affects reset reliability.

Can the MAX6464UK31+T be used with a 1.8V microcontroller supply?

Yes, the MAX6464UK31+T can supervise a 1.8V system supply, but only if the 1.8V rail is also used as its VCC input. Its operating range is 1.2V to 6.0V, and its 3.1V threshold applies to the voltage applied to its VCC pin. To monitor a 1.8V rail, select a variant with a lower threshold suffix (e.g., MAX6464UK18+T). The MAX6464UK31+T itself is intended for 3.3V systems where 3.1V brownout detection is required.