MAX6456UT31L+T

MAX6456UT31L+T Application Field and Working Principle

MAX6456UT31L+T is a precision-programmed, low-voltage supervisors integrated circuit (IC) and is categorized under PMIC - Supervisors. The MAX6456UT31L+T works in microprocessor (µP) supervisory functions, monitoring the power inputs on 3-V to 5.5-V systems containing µP, ASSP and DSP circuits. It is used in applications such as microprocessor and digital signal processor (DSP) based systems, microcontrollers, LAN motherboards, cellular phones, and ISA/PCI bus-based systems.

The IC offers a guaranteed supply voltage threshold accuracy to ensure robust and reliable system power-on reset. It provides a minimal power-on reset pulse width of 10 ms, as well as a low supply current of 400 µA for fan-speed monitors and other low-power applications. The MAX6456UT31L+T is available in the 14-pin 3 mm × 3 mm TDFN (lead-free), 10-pin µMAX and 8-pin SO packages.

The MAX6456UT31L+T monitors two power supplies and an optional power-good signal. With an input voltage range of 2.7 V to 5.5 V, it ensures that the supply voltages stay within their power-on reset (POR) thresholds. The MAX6456UT31L+T utilizes a frequency-modulated, dual-phase reset impulse (FMDIR) circuit, which allows it to accurately detect a rising and falling power-supply voltage. The FMDIR circuit ensures a short, clean pull-up and pull-down reset pulse instead of the long, asynchronous low voltage glitch that often occurs on power-up. This saves critical clock cycles needed for powering up the system.

The MAX6456UT31L+T supervisor also offers two programmable watchdog timers that give users the option of having both fixed and variable reset timing. The reset output is delivered either as an active low pulse of 25 ms (MIN) or a higher logic state with a 150 ms timeout. The two timers share the same reset logical output with users having the option to combine them or separately control the second window timer with a separate input. The MAX6456UT31L+T also offers an adjustable reset threshold voltage window via a 2-wire serial programming. This voltage window can be adjusted by programming a minimum and maximum value, allowing 6 bits of granularity.

The MAX6456UT31L+T supervisor offers additional features such as an early warning monitor for slow supply ramp-up and many protection functions against damage. For example, it has over-temperature protection and reverse current protection. The MAX6456UT31L+T also offers operational flexibility with programmable power-good timeout, watchdog timeout and reset logic setup. All of these features make the MAX6456UT31L+T a reliable, robust and cost effective solution for precision system supervision.

In conclusion, the MAX6456UT31L+T supervisor is an excellent IC for regulating power supplies in microprocessor-based systems and offers features that make it a reliable, robust and cost efficient solution. It features dual watchdog timers, a frequency-modulated dual-phase reset impulse circuit, adjustable reset threshold voltage window and a wide range of protection functions. All these features contribute to the reliability and longevity of the MAX6456UT31L+T.