Analog Devices Inc./Maxim Integrated MAX6328UR23+TG65

Overview

MAX6328UR23+TG65 from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit designed to monitor 2.32V power supplies and assert an active-low reset signal during brownout, power-up, and power-down events. It guarantees correct operation down to VCC = 1.2V, delivers ≤1µA supply current at +25°C, maintains ≥100ms reset timeout after VCC recovery, and is housed in a 3-pin SOT23-3 package for space-constrained embedded systems.

For engineers reviewing the MAX6328UR23+TG65 datasheet, MAX6328UR23+TG65 pinout, MAX6328UR23+TG65 application, or MAX6328UR23+TG65 equivalent, this page provides verified functional identity, factory-trimmed 2.32V reset threshold behavior, open-drain output design implications, temperature-stable hysteresis (6.3mV), and direct substitution guidance against industry-standard µP reset ICs.

Technical Context

The MAX6328UR23+TG65 implements a precision bandgap-based reset comparator with factory-trimmed 2.32V threshold (±1.5% at +25°C, ±2.5% over –40°C to +85°C) and 6.3mV hysteresis to prevent chatter during slow VCC transitions. Its open-drain RESET output requires an external pull-up and supports bidirectional µP reset interfaces like the Motorola 68HC11.

It features transient immunity up to 100V/µs dV/dt on VCC and ignores fast negative-going glitches - maximum allowable transient duration drops from ~200µs at 10mV overdrive to <10µs at 200mV overdrive. The device operates fully specified from –40°C to +85°C with no external components required.

Key Specifications

Pinout & Package

MAX6328UR23+TG65 is packaged in a RoHS-compliant 3-pin SOT23-3 (U3-1) surface-mount package with 0.95mm pitch, footprint-compatible with SC70-3 but with higher power dissipation rating (320mW at +70°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX6328UR23+TG65, MAX809TRD2+T offers simpler drive but loses reset bus flexibility, while TPS3808G12DBVR adds functionality at cost of area and current-making MAX6328UR23+TG65 optimal for minimal, ultra-low-power open-drain reset needs.

Availability

MAX6328UR23+TG65 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, medical wearable sensors, and smart meter communication modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MAX6328UR23+TG65 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, medical, and communications applications, emphasizing reliability, low power, and integration.

The MAX6328UR23+TG65 belongs to the MAX6326/MAX6327/MAX6328 family of ultra-low-power µP supervisory circuits, engineered specifically for robust, zero-calibration power monitoring in portable and battery-critical systems.

FAQ

What is the exact reset threshold voltage of MAX6328UR23+TG65 and how tightly is it specified?

The MAX6328UR23+TG65 has a factory-trimmed nominal reset threshold of 2.32V. At +25°C, this is guaranteed within ±1.5% (2.285V to 2.355V). Over the full operating temperature range (–40°C to +85°C), the threshold remains within ±2.5%, resulting in a min/max span of 2.262V to 2.375V. This precision eliminates need for external adjustment and ensures consistent behavior across environmental conditions.

Does MAX6328UR23+TG65 require an external pull-up resistor on its RESET pin?

Yes, MAX6328UR23+TG65 features an open-drain RESET output and absolutely requires an external pull-up resistor to define the logic-high voltage level. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, the RESET signal cannot reach a valid high state, rendering the device nonfunctional in most µP interface configurations.

Can MAX6328UR23+TG65 operate reliably at VCC = 1.2V?

Yes, MAX6328UR23+TG65 is fully specified to maintain correct reset assertion and deassertion behavior down to VCC = 1.2V across the full temperature range. Its internal circuitry remains functional and the reset comparator retains accuracy even at this low supply voltage-critical for systems powered by deeply discharged batteries or ultra-low-voltage regulators.

How does the reset timeout period of MAX6328UR23+TG65 behave over temperature?

The reset timeout period of MAX6328UR23+TG65 is guaranteed minimum 100ms and typifies 185ms at +25°C, extending up to 280ms maximum across –40°C to +85°C. This monotonic increase with temperature ensures conservative timing margins under worst-case thermal conditions, satisfying stringent µP power-on reset requirements without external timing components.

Is MAX6328UR23+TG65 pin-compatible with older Maxim reset ICs like MAX809?

No, MAX6328UR23+TG65 is not pin-compatible with MAX809 series devices. While both use SOT23-3 packages, MAX809 has push-pull output with RESET on pin 3 and GND on pin 1, whereas MAX6328UR23+TG65 places GND on pin 1 and open-drain RESET on pin 2. Swapping them without PCB revision will result in incorrect or nonfunctional reset signaling.