Analog Devices Inc./Maxim Integrated MAX6352LSUK

Overview

MAX6352LSUK from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-low open-drain reset output referenced to VCC1, precision factory-set thresholds of 4.63V (VCC1) and 2.93V (VCC2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used for reliable power-on reset and supply monitoring in multivoltage embedded systems.

For engineers reviewing the MAX6352LSUK datasheet, MAX6352LSUK pinout, MAX6352LSUK application, or MAX6352LSUK equivalent, key selection considerations include its dual-threshold monitoring capability, open-drain RST output with 100ms min timeout, manual-reset debouncing, and operation across -40°C to +85°C without external components.

Technical Context

The MAX6352LSUK monitors two independent supply rails (VCC1 and VCC2) and asserts its open-drain RST output low when either drops below its respective threshold (4.63V/2.93V). Its reset logic guarantees valid output as long as at least one supply remains ≥1.0V, enabling robust brownout detection in asymmetric power domains.

It integrates a debounced TTL/CMOS-compatible manual-reset input (MR) and supports no external timing components. Unlike variants with watchdog or third-voltage inputs, MAX6352LSUK excludes WDI and RSTIN functions - confirmed by its 5-pin SOT23 pinout and selector guide classification.

Key Specifications

Pinout & Package

MAX6352LSUK is housed in a 5-pin SOT23 package (package code U5-1), with 1.6mm × 2.8mm footprint and 0.95mm height. Pin 1 is RST (open-drain), Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, and Pin 5 is VCC1 - verified from Maxim's official pin configuration diagram and selector guide.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6352LSUK, MAX6353LSUK offers identical monitoring but lacks open-drain flexibility, while TPS3808G33DBVR reduces integration by omitting VCC2 supervision - making MAX6352LSUK the optimal choice for space-constrained dual-rail designs requiring shared reset architecture.

Availability

MAX6352LSUK is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, automotive body control modules, and network edge routers requiring stable component supply with guaranteed long-term sourcing.

Supply support for MAX6352LSUK 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, communications, and computing applications.

The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor systems requiring precise, low-power, and temperature-stable supply supervision without external components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6352LSUK?

The MAX6352LSUK has a factory-set VCC1 threshold of 4.63V (±0.09V at +25°C, 4.50V to 4.75V over -40°C to +85°C) and a VCC2 threshold of 2.93V (±0.05V at +25°C, 2.85V to 3.00V over temperature). These values are defined by the "LS" suffix per Maxim's Voltage Threshold Levels table and are laser-trimmed during production.

Does the MAX6352LSUK include a watchdog timer or third-voltage monitor?

No, the MAX6352LSUK does not include a watchdog timer or third-voltage monitor. It is a dual-supply supervisor only - confirmed by its 5-pin SOT23 package, absence of WDI or RSTIN pins, and classification in the selector guide as a non-watchdog, non-triple-monitor variant.

What is the function of Pin 1 on the MAX6352LSUK, and what external component is required?

Pin 1 of the MAX6352LSUK is the active-low open-drain RST output. Because it is open-drain, an external pull-up resistor (typically 4.7kΩ to 10kΩ) is required to establish a defined logic-high level - the value depends on bus capacitance and rise-time requirements of the connected microcontroller reset input.

Can the MAX6352LSUK operate reliably if only one supply (e.g., VCC1) is present and VCC2 is unconnected?

Yes - the MAX6352LSUK guarantees valid RST output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. If VCC2 is unconnected (floating), it must be tied to GND or left open per design guidance; the device will still monitor VCC1 and assert RST if it falls below 4.63V, provided VCC1 remains ≥1.0V.

What is the minimum reset pulse width guaranteed by the MAX6352LSUK across temperature?

The MAX6352LSUK guarantees a minimum reset pulse width of 100ms (tRP) when VCC1 > VTH1(MAX) and VCC2 > VTH2(MAX), with typical values up to 280ms. This specification is fully characterized and production-tested across the -40°C to +85°C operating range, ensuring compliance with processor reset timing requirements.