LM3722

LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits June 2001 LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits General Description The LM3722/LM3723/LM3724 microprocessor supervisory circuits monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, power-down, brown-out conditions, and manual reset. The LM3722/LM3723/LM3724 asserts a reset signal whenever the supply decreases below the factory-programmed reset threshold for at least 100 ms. The reset signal remains asserted for 190 ms after VCC rises above the threshold. The LM3722 has an active-low RESET push-pull output. The LM3723 has an active-high RESET push-pull output. The LM3724 has an active-low open-drain RESET output. Three standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional reset voltages are also available; contact National Semiconductor for details. With a low supply current of only 6µA, the LM3722/LM3723/LM3724 are ideal for use in portable equipment. The LM3722/LM3723/LM3724 are available in the 5-pin SOT23 package. Features n Precise monitoring of 2.5V, 3.3V, and 5V supply voltages n Fully specified over temperature Industrial: −40˚C to +85˚C Extended: −40˚C to +125˚C n 100 ms minimum Power-On Reset pulse width, 190 ms typical: Active-Low RESET Output (LM3722) Active-High RESET Output (LM3723) Active-Low RESET Open Drain Output (LM3724) n Guaranteed RESET Output...