Analog Devices Inc./Maxim Integrated MAX6465UR23+T

Overview

MAX6465UR23+T from Maxim Integrated is a micropower supervisory circuit with active-high push-pull output, 2.3V lower trip threshold (VTH−), 150ms minimum reset timeout, and ultra-low 1.0µA supply current at 3.6V. It monitors VCC in portable medical devices and battery-powered systems to assert a clean, glitch-immune reset signal during brownout conditions.

For engineers reviewing the MAX6465UR23+T datasheet, MAX6465UR23+T pinout, MAX6465UR23+T application, or MAX6465UR23+T equivalent, key selection criteria include guaranteed 150ms reset pulse width, ±2.5% threshold accuracy over −40°C to +125°C, internal 5% hysteresis, push-pull active-high output drive capability, and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6465UR23+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set a factory-trimmed VTH− of 2.266V (min) to 2.335V (max) at +25°C, and VTH+ = VTH− × 1.05. Its internal hysteresis prevents chatter near threshold, and its propagation behavior is defined only for reset assertion timing-not voltage detection delay.

As a µP supervisory variant (not a simple voltage detector), it integrates a monostable timeout circuit that holds the active-high output asserted for ≥150ms after VCC rises above VTH+, independent of input slew rate. This ensures reliable processor reset release timing across temperature and supply variations.

Key Specifications

Pinout & Package

SOT23-3 package: 3-pin surface-mount, 1.3mm × 2.9mm footprint, 1.45mm height, lead-free (RoHS-compliant) with +T suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB23DBVR and TPS3808G125DBVR, the MAX6465UR23+T delivers guaranteed 150ms reset hold time, full −40°C to +125°C qualification, and zero-external-component operation-making it optimal for ruggedized, long-life, and safety-critical embedded systems where reliability outweighs minor cost differences.

Availability

MAX6465UR23+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial handheld scanners, and automotive telematics modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6465UR23+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 deep expertise in ultra-low-power supervision and battery management.

The MAX6461–MAX6466 family was engineered specifically for space- and energy-constrained systems needing guaranteed reset timing, factory-trimmed thresholds, and operation across harsh environmental conditions-targeting portable, automotive, and industrial edge devices.

FAQ

What is the exact reset threshold voltage of MAX6465UR23+T at room temperature?

The MAX6465UR23+T has a factory-trimmed lower trip threshold (VTH−) of 2.266V (min) to 2.335V (typical 2.300V) at +25°C, with corresponding upper threshold VTH+ = VTH− × 1.05. This is confirmed in Table 1a of the official datasheet and applies specifically to the UR23+T variant. The MAX6465UR23+T's tolerance ensures reliable detection across 2.3V nominal supply rails without external adjustment.

Does MAX6465UR23+T require an external pullup resistor on the OUT pin?

No, the MAX6465UR23+T features a push-pull active-high output stage, meaning it actively drives both high and low states without external components. When asserted (reset active), OUT sinks to ≤0.4V; when released, it drives high to ≥0.8×VCC. This eliminates the need for a pullup resistor, simplifying layout and reducing BOM count-unlike open-drain variants such as MAX6466UR23+T.

What is the minimum reset timeout period guaranteed for MAX6465UR23+T over temperature?

The MAX6465UR23+T guarantees a minimum reset timeout period of 150ms over the full operating temperature range of −40°C to +125°C. Electrical Characteristics table specifies tRP = 150ms (min), 260ms (typ), 430ms (max). This ensures microcontrollers receive a sufficiently long, noise-immune reset pulse regardless of ambient conditions-critical for deterministic boot behavior in automotive and industrial applications.

Can MAX6465UR23+T operate from a 1.8V supply?

Yes, the MAX6465UR23+T operates from VCC = 1.2V to 6.0V per Absolute Maximum Ratings and Electrical Characteristics tables. At 1.8V, it maintains full functionality-including 2.3V threshold monitoring, 150ms timeout, and push-pull output drive-with supply current rising to ≤2.5µA (TA = −40°C to +85°C). This makes the MAX6465UR23+T suitable for dual-supply systems and low-voltage battery chemistries.

How does the internal hysteresis of MAX6465UR23+T improve system reliability?

The MAX6465UR23+T incorporates fixed 5% internal hysteresis (VTH+ = VTH− × 1.05), which creates distinct rising and falling trip points. This prevents output oscillation ("chatter") when VCC lingers near the 2.3V threshold due to noise, slow ramp-up, or marginal regulation-ensuring clean, single-pulse reset assertion. Unlike externally hysteresis-configured supervisors, this behavior is guaranteed across temperature and requires no design effort, directly enhancing MAX6465UR23+T's field reliability.