Analog Devices Inc./Maxim Integrated MAX6357TYUT

Overview

MAX6357TYUT from Maxim Integrated is a dual-voltage microprocessor supervisory IC with triple-monitor capability (VCC1, VCC2, and RSTIN), featuring an active-low push-pull reset output referenced to VCC2, factory-set thresholds of 3.08V (VCC1) and 2.19V (VCC2), and a precision 1.22V adjustable comparator input for third-voltage monitoring - used in multivoltage embedded systems requiring guaranteed reset assertion down to VCC = 1.0V.

For engineers reviewing the MAX6357TYUT datasheet, MAX6357TYUT pinout, MAX6357TYUT application, or MAX6357TYUT equivalent, key selection criteria include its SOT23-6 package, dual-supply monitoring with independent trip points, RSTIN-based third-voltage supervision, reset timeout ≥100ms, and guaranteed operation across –40°C to +85°C.

Technical Context

The MAX6357TYUT monitors two primary supply rails (VCC1 and VCC2) and a third voltage via the RSTIN pin with a fixed 1.22V threshold, enabling flexible external resistive divider configuration. Its reset output (RST) is push-pull and referenced to VCC2, ensuring valid logic levels even when VCC1 drops below 1.0V as long as VCC2 remains ≥1.0V.

It includes a debounced manual reset (MR) input with 1µs minimum pulse width and glitch rejection up to 100ns, and guarantees reset assertion if either monitored supply falls below its preset threshold. Unlike watchdog-equipped variants (e.g., MAX6359/MAX6360), MAX6357TYUT omits watchdog functionality - confirmed by absence of WDI pin and watchdog timing specs in its device-specific pinout and electrical characteristics.

Key Specifications

Pinout & Package

MAX6357TYUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.3mm × 2.1mm footprint and 0.95mm height - compatible with standard high-density PCB assembly processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6357TYUT, MAX6356TYUT provides identical threshold levels but references reset to VCC1 and omits RSTIN - reducing third-rail flexibility. TPS3808G33DBVR offers lower quiescent current but cannot replace MAX6357TYUT in dual- or triple-rail applications without added components.

Availability

MAX6357TYUT is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor hubs, automotive body control modules, and IoT edge gateways requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.

Supply support for MAX6357TYUT 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 industrial, medical, communications, and computing applications - emphasizing high reliability, low power, and integration density.

The MAX6351–MAX6360 family delivers multivoltage µP supervision with factory-trimmed thresholds and minimal external components - targeting space-constrained, mission-critical embedded systems needing deterministic reset behavior under brownout and transient conditions.

FAQ

What is the function of the RSTIN pin on the MAX6357TYUT?

The RSTIN pin on the MAX6357TYUT is a precision 1.22V comparator input used to monitor a third voltage rail. When the voltage at RSTIN falls below 1.22V, the device asserts its active-low RST output. It is powered by VCC1 and must not exceed VCC1. External resistive dividers allow monitoring of higher voltages - for example, a +1.8V rail can be scaled to 1.22V using appropriate resistor values. This feature makes MAX6357TYUT uniquely capable of triple-voltage supervision in a single SOT23-6 package.

Does the MAX6357TYUT include a watchdog timer?

No, the MAX6357TYUT does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants, which feature a WDI pin and dual-mode timeout periods (46.4s startup, 2.9s normal). The MAX6357TYUT pinout shows RSTIN at pin 5 - not WDI - and its electrical specifications omit all watchdog-related parameters. Therefore, MAX6357TYUT is intended for systems relying solely on voltage monitoring and manual reset, not processor activity supervision.

What are the exact voltage thresholds for the MAX6357TYUT?

The MAX6357TYUT has factory-set voltage thresholds of 3.08V for VCC1 (with ±0.15V tolerance over –40°C to +85°C) and 2.19V for VCC2 (with ±0.06V tolerance over the same range). These values correspond to the "TY" suffix in Maxim's ordering nomenclature. The RSTIN input has a fixed threshold of 1.22V (±0.03V), enabling accurate third-voltage monitoring. All thresholds are trimmed during production and guaranteed across temperature - no external calibration is required for MAX6357TYUT.

How does the reset output of the MAX6357TYUT behave when VCC2 drops below 1.0V?

The MAX6357TYUT guarantees valid reset output as long as either VCC1 ≥1.0V or VCC2 ≥1.0V. If VCC2 drops below 1.0V but VCC1 remains ≥1.0V, the RST output remains functional because internal logic continues operating from VCC1. However, since the RST output is push-pull referenced to VCC2, its high-level voltage (VOH) collapses as VCC2 falls - meaning RST will be driven low (active) or float unpredictably once VCC2 drops too far. Thus, for reliable RST signaling, both supplies should stay within their operational ranges; the 1.0V guarantee ensures reset assertion *during* brownout, not sustained output drive below that point.

Is the MAX6357TYUT pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6357TYUT shares the SOT23-6 package and pinout with MAX6355/MAX6356/MAX6358/MAX6359/MAX6360, but pin functions differ across variants. Specifically, pin 5 is RSTIN on MAX6357TYUT, whereas it is WDI on MAX6358/MAX6359/MAX6360 and open-drain RST on MAX6355. Substituting MAX6357TYUT for another variant without verifying pin function alignment - especially RSTIN vs. WDI - risks functional failure. Always consult the specific device's pin description table before replacement; MAX6357TYUT is not a drop-in replacement for watchdog or open-drain variants.