Analog Devices Inc./Maxim Integrated MAX6464UK22+T

Overview

MAX6464UK22+T from Maxim Integrated is a micropower supervisory circuit with 2.2V lower trip threshold (VTH−), 150ms minimum reset timeout, and push-pull active-high output in SOT23-5 package. It monitors system supply voltage, asserts reset during undervoltage conditions, and holds reset for ≥150ms after recovery-enabling reliable µP initialization in battery-powered medical devices and portable instrumentation.

For engineers reviewing the MAX6464UK22+T datasheet, MAX6464UK22+T pinout, MAX6464UK22+T application, or MAX6464UK22+T equivalent, key selection criteria include guaranteed 150ms reset timeout, ±2.5% threshold accuracy over −40°C to +125°C, ultra-low 1.0µA supply current at 3.6V, and compatibility with 1.2V–6.0V VCC operation.

Technical Context

The MAX6464UK22+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 2.200V (±2.5%) and VTH+ = 2.310V (5% hysteresis). Its reset assertion logic includes a monostable timeout circuit that guarantees ≥150ms output hold time after VCC crosses VTH+, independent of transient duration.

It operates across full industrial temperature range (−40°C to +125°C) with no external components required. The push-pull active-high output drives logic inputs directly without pull-up resistors and sinks up to 9mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount, lead-free, RoHS-compliant, footprint compatible with industry-standard SOT23-5 land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6464UK22+T, MAX6465UK22+T offers identical supervision timing but requires active-low interface design, while TPS3808G125DBVR shifts threshold upward and increases timeout-making MAX6464UK22+T the optimal choice for 2.2V brownout protection with minimal BOM impact.

Availability

MAX6464UK22+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, industrial handheld terminals, and low-power IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6464UK22+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 management, sensing, and interface applications in industrial, medical, and communications markets.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage supervision in space-constrained, battery-operated systems where long service life and guaranteed reset timing are critical.

FAQ

What is the exact voltage threshold of MAX6464UK22+T?

The MAX6464UK22+T has a factory-trimmed lower trip threshold (VTH−) of 2.200V ±2.5% over −40°C to +125°C, with corresponding upper threshold (VTH+) of 2.310V (5% hysteresis). These values are confirmed in Table 1a and Table 1b of the official datasheet, and apply specifically to the "22" suffix variant of the MAX6464UK22+T.

Does MAX6464UK22+T require external components for basic operation?

No, the MAX6464UK22+T requires no external components for core supervision functionality. Its precision bandgap reference, comparator, trimmed resistor network, and timeout circuit are fully integrated. Only decoupling capacitance (recommended 0.1µF ceramic near VCC/GND) is advised for noise suppression-no external resistors, capacitors, or diodes are needed to achieve specified 2.2V detection and 150ms reset hold.

What is the function of Pin 5 (N.C.) on MAX6464UK22+T?

Pin 5 of the MAX6464UK22+T is designated N.C. (No Connection) and is not internally bonded. It must remain unconnected on the PCB. This pin exists due to the shared SOT23-5 package used across the MAX6461–MAX6466 family; for MAX6464UK22+T, it serves no electrical function and grounding or routing to it will compromise device reliability.

Can MAX6464UK22+T operate with supply voltages below 1.6V?

Yes, the MAX6464UK22+T functions down to 1.2V VCC per Absolute Maximum Ratings and Electrical Characteristics tables. However, its 2.2V threshold means it will assert reset continuously when VCC < 2.2V. Operation below 1.2V is not guaranteed, and output sinking capability degrades below 1.0V-so system-level design should ensure valid logic levels are maintained only within the 1.2V–6.0V operational range.

How does the 150ms reset timeout of MAX6464UK22+T behave during repeated brownouts?

The MAX6464UK22+T timeout circuit is retriggerable: each time VCC falls below VTH−, the 150ms timer resets and begins anew. If VCC recovers above VTH+ and then drops again within the timeout window, the output remains asserted continuously. This ensures robust reset assertion during unstable supply conditions-critical for preventing partial µP execution in portable equipment with fluctuating battery voltage.