Analog Devices Inc./Maxim Integrated MAX6354SYUK+

Overview

MAX6354SYUK+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, precision factory-set thresholds of 2.93V (VCC1) and 2.19V (VCC2), 20µA supply current, and guaranteed RESET validity down to VCC1 or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on and brownout detection.

For engineers reviewing the MAX6354SYUK+ datasheet, MAX6354SYUK+ pinout, MAX6354SYUK+ application, or MAX6354SYUK+ equivalent, this page delivers verified pin functions, exact threshold tolerances, reset timing behavior across temperature, manual-reset debouncing specs, and validated alternative parts for dual-supply monitoring designs.

Technical Context

The MAX6354SYUK+ monitors two independent supply rails (VCC1 and VCC2) and asserts its single active-low push-pull RST output when either falls below its respective factory-trimmed threshold (2.93V ±0.05V for VCC1, 2.19V ±0.03V for VCC2). Reset remains valid as long as at least one supply stays ≥1.0V, enabling robust operation during asymmetric rail collapse.

It features a debounced TTL/CMOS-compatible manual-reset input (MR) with 1µs minimum pulse width and 100ns glitch rejection, and operates over –40°C to +85°C without external components - unlike discrete solutions requiring resistors, capacitors, and comparators.

Key Specifications

Pinout & Package

MAX6354SYUK+ is housed in a 5-pin SOT23 package (U5-1 outline, land pattern 90-0174), RoHS-compliant with lead(Pb)-free finish (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6353SYUK+, MAX6354SYUK+ delivers VCC2-referenced reset essential for systems where the reset signal must remain valid relative to a secondary logic rail; versus TPS3808G33DBVR, it integrates dual monitoring into one die, reducing footprint, cost, and timing skew between rail detections.

Availability

MAX6354SYUK+ is available at Aetrix Electronics and suitable for computers, portable/battery-powered equipment, and multivoltage systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6354SYUK+ 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 high-performance analog and mixed-signal ICs for industrial, computing, and communications applications.

The MAX6351–MAX6360 family was engineered specifically for reliable dual- and triple-voltage microprocessor supervision in space-constrained, multirail embedded systems - prioritizing precision threshold accuracy, low IQ, and guaranteed operation across extended temperature ranges.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6354SYUK+?

The MAX6354SYUK+ has a factory-set VCC1 threshold of 2.93V (±0.05V at +25°C) and a VCC2 threshold of 2.19V (±0.03V at +25°C), as defined by the "SY" suffix per Maxim's Voltage Threshold Levels table. These values are production-tested across –40°C to +85°C, with tempco limited to 20ppm/°C. The MAX6354SYUK+ asserts reset whenever either supply falls below its respective threshold, and the RST output remains active as long as at least one supply stays ≥1.0V.

Is the MAX6354SYUK+ pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6354SYUK+ uses the 5-pin SOT23 package (U5-1) and shares identical pinout with MAX6352, MAX6353, and MAX6354 variants - Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1. However, RST functionality differs: MAX6354SYUK+ provides VCC2-referenced push-pull output, while MAX6352 offers open-drain and MAX6353 uses VCC1-referenced push-pull. Thus, electrical compatibility depends on load requirements and rail referencing - MAX6354SYUK+ is not a direct drop-in replacement for MAX6352 or MAX6353 without circuit review.

Does the MAX6354SYUK+ include a watchdog timer function?

No, the MAX6354SYUK+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants (all 6-pin SOT23), which feature dual-mode timeout periods (46.4s startup / 2.9s normal). The MAX6354SYUK+ belongs to the base supervisory group (no WDI pin) and provides only dual-voltage monitoring, manual reset, and reset timing - confirmed by its 5-pin configuration and absence of WDI in the pin description table.

What is the maximum supply voltage the MAX6354SYUK+ can tolerate on VCC1 and VCC2?

The MAX6354SYUK+ supports VCC1 and VCC2 inputs from 1.2V to 5.5V over the full operating temperature range (–40°C to +85°C), with absolute maximum ratings of –0.3V to +6V. Electrical characteristics such as supply current (20µA typ), reset delay (20µs), and output drive (VOL ≤ 0.3V at ISINK = 1.2mA) are specified across this range. Exceeding 5.5V risks violating production-tested limits, though brief transients up to +6V are tolerated per absolute max ratings - sustained operation above 5.5V is not recommended for reliability.

Can the MAX6354SYUK+ monitor three voltage rails?

No, the MAX6354SYUK+ monitors exactly two voltage rails: VCC1 and VCC2. Triple-voltage monitoring is provided only by MAX6355, MAX6356, and MAX6357 variants, which include an additional RSTIN pin for external resistive-divider-based threshold setting (typically 1.22V reference). The MAX6354SYUK+ has no RSTIN pin - its 5-pin SOT23 package contains only RST, GND, MR, VCC2, and VCC1. Attempting to add third-rail monitoring would require external circuitry and defeat the integrated advantage of the MAX6354SYUK+.