LM3724 Datasheet | National Semiconductor

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 valid for VCC ≥ 1V n Low Supply Current, 6µA typical n Power supply transient immunity n patible with MAX811/812 applications Applications n n n n n Microprocessor Systems puters Controllers Intelligent Instruments Portable/Battery-Powered Equipment Typical Application Circuit Connection Diagram SOT23-5 - ( ) are for LM3723 © 2001 National Semiconductor Corporation DS200144 .national. LM3722/LM3723/LM3724 Ordering Information Industrial Temperature Range (- 40˚C to +85˚C): Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 LM3722...