Analog Devices Inc./Maxim Integrated MAX6351LTUT

Overview

The MAX6351LTUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-RST1 referenced to VCC1 and RST2 referenced to VCC2-designed for multivoltage systems requiring precise, independent monitoring of +4.63V (VCC1) and +3.08V (VCC2) supplies. It guarantees valid reset assertion down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, features 20µA supply current, 100ms min power-on-reset pulse width, and operates across –40°C to +85°C in a 6-pin SOT23 package.

For engineers reviewing the MAX6351LTUT datasheet, MAX6351LTUT pinout, MAX6351LTUT application, or MAX6351LTUT equivalent, this device serves as a precision dual-threshold supervisor for embedded controllers, portable equipment, and intelligent instruments where reliable power sequencing and fault detection are critical.

Technical Context

The MAX6351LTUT implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.63V ±40mV at +25°C, 3.08V ±40mV at +25°C) and 20ppm/°C tempco. Reset outputs assert when either supply drops below its threshold, and remain asserted until both supplies exceed their respective thresholds plus hysteresis (VTH/500).

It includes a debounced TTL/CMOS-compatible manual-reset input (MR), supports supply transient immunity up to 250µs at 1V overdrive, and maintains guaranteed reset validity even as VCC1 or VCC2 decays to 1.0V-enabling robust brownout detection without external components.

Key Specifications

Pinout & Package

MAX6351LTUT is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with exposed pad not electrically connected. The package supports leaded and RoHS-compliant (Pb-free) variants; ordering suffix "-T" denotes standard leaded, "+T" denotes Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6351LTUT, MAX6353LTUK-T reduces pin count and package size but sacrifices independent VCC2 supervision, while TPS3808G33DBVR offers lower cost per channel but cannot replace dual-rail functionality without added components and design effort.

Availability

MAX6351LTUT is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and network edge routers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6351LTUT 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 consumer applications.

The MAX6351–MAX6360 family was designed specifically for multivoltage embedded systems needing precision, low-power, and highly integrated power-supply supervision without external components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351LTUT?

The MAX6351LTUT has factory-set thresholds of 4.63V ±40mV for VCC1 and 3.08V ±40mV for VCC2 at +25°C, with guaranteed tolerances of ±0.05V over –40°C to +85°C. These values are laser-trimmed during production and documented in the Electrical Characteristics table of the MAX6351LTUT datasheet.

Does the MAX6351LTUT include a watchdog timer function?

No, the MAX6351LTUT does not include a watchdog timer. Watchdog functionality is only present in the MAX6358/MAX6359/MAX6360 variants. The MAX6351LTUT provides dual-voltage supervision with manual reset and two independent push-pull reset outputs-but no WDI input or timeout logic.

Can the MAX6351LTUT operate with supply voltages below 1.2V?

The MAX6351LTUT guarantees functional operation only down to VCC1 ≥ 1.2V or VCC2 ≥ 1.2V across the full temperature range. However, its reset outputs remain valid and correctly asserted as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V-enabling reliable brownout detection during deep discharge scenarios.

What is the package type and footprint for the MAX6351LTUT?

The MAX6351LTUT is supplied in a 6-pin SOT23 package (outline U6-1, land pattern 90-0175). It uses standard SOT23-6 PCB footprint dimensions (1.6mm × 2.9mm body, 0.95mm pitch), compatible with automated assembly and reflow processes. RoHS-compliant versions use "+T" suffix.

How does the manual reset (MR) input behave on the MAX6351LTUT?

The MR input on the MAX6351LTUT is an active-low, debounced TTL/CMOS-compatible signal. When pulled low, it forces both RST1 and RST2 active regardless of VCC1/VCC2 status. After MR returns high, reset remains asserted for the full timeout period (100–280ms), ensuring consistent deassertion timing. MR must not exceed VCC1 voltage.