Analog Devices Inc./Maxim Integrated MAX6828YUT+T

Overview

MAX6828YUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, manual reset input (MR), and watchdog timer (WDI). It monitors primary VCC (2.12V–2.25V threshold, Y-suffix) and secondary supply via user-adjustable RESET IN input (typical 0.63V threshold), provides 140ms minimum reset timeout, and operates over –40°C to +125°C in a 6-pin SOT23 package for battery-powered embedded systems.

For engineers reviewing the MAX6828YUT+T datasheet, MAX6828YUT+T pinout, MAX6828YUT+T application, or MAX6828YUT+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-threshold monitoring behavior, and real-world selection guidance for critical µP reset supervision in multivoltage portable and industrial controllers.

Technical Context

The MAX6828YUT+T implements independent voltage monitoring of VCC (factory-trimmed to 2.19V nominal at –40°C to +125°C) and RESET IN (0.63V internal comparator reference), with OR-combined fault detection triggering a single open-drain RESET output. Its watchdog timer features 1.6s nominal timeout with edge-triggered clearing and glitch immunity up to 100ns on MR/WDI inputs.

Reset assertion occurs when VCC falls below 2.11V (min), RESET IN drops below 0.61V (min), MR is pulled low, or WDI remains static beyond 1.6s; reset remains asserted for ≥140ms after recovery. The device guarantees valid RESET operation down to VCC = +1.2V and draws ≤25µA ICC at –40°C to +125°C with VCC = +2.19V.

Key Specifications

Pinout & Package

MAX6828YUT+T uses a 6-pin SOT23 package (outline U6+1, land pattern 90-0175) with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6827YUT+T, MAX6828YUT+T's open-drain output enables direct bidirectional µP reset I/O interfacing without additional logic; compared with MAX6831YUT+T, its RESET IN input provides design flexibility for custom secondary voltage thresholds below 2.2V.

Availability

MAX6828YUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across automotive and industrial temperature ranges.

Supply support for MAX6828YUT+T 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6826–MAX6831 family delivers dual-supply µP supervision with integrated watchdog and manual reset in ultra-small SOT23 packages, targeting space-constrained and low-power embedded systems requiring high reliability.

FAQ

What is the exact VCC reset threshold voltage range for MAX6828YUT+T over temperature?

The MAX6828YUT+T has a VCC reset threshold of 2.11V (min) to 2.26V (max) across –40°C to +125°C, corresponding to the Y-suffix specification per Maxim's Threshold Suffix Guide. This range ensures reliable detection of brownout on a nominal 2.2V supply rail while accommodating process and temperature variation without external calibration.

Does MAX6828YUT+T support monitoring a 1.2V secondary supply?

Yes, MAX6828YUT+T supports monitoring a 1.2V secondary supply using its RESET IN pin with an external resistor divider. With a 0.63V internal reference, a 1:1 resistor ratio (R1 = R2) scales 1.2V down to 0.6V at RESET IN-within the 0.61V–0.65V valid threshold window-enabling accurate 1.2V rail supervision without additional ICs.

What is the watchdog timeout behavior when WDI is left unconnected on MAX6828YUT+T?

When WDI is left unconnected on MAX6828YUT+T, the internal watchdog timer is automatically serviced every ~1.4s by an internal low-high-low pulse, effectively disabling the watchdog function. No external pullup/down is required, and the device operates solely as a dual-voltage supervisor without timeout-based reset intervention.

Can MAX6828YUT+T drive a reset line shared with other open-drain devices?

Yes, MAX6828YUT+T's open-drain RESET output is designed for wired-OR configurations. It can share a common reset bus with other open-drain supervisors or logic outputs, provided a single pullup resistor (typically 10kΩ) is used and total sink current remains within 1.2mA (per VOL spec at VCC ≥ 2.55V), ensuring clean reset assertion across multiple devices.

Is MAX6828YUT+T pin-compatible with other devices in the MAX6826–MAX6831 family?

Yes, MAX6828YUT+T shares identical 6-pin SOT23 pinout and package dimensions (U6+1) with all MAX6826–MAX6831 variants. Pin functions-including RESET (pin 1), GND (pin 2), MR (pin 3), WDI (pin 4), RESET IN (pin 5), and VCC (pin 6)-are consistent across the family, enabling drop-in replacement where functional requirements align.