ASM812

October 2003 rev 1.0 ASM811, ASM812 4 Pin µP Voltage Supervisor with Manual Reset Six voltage thresholds are available to support 3V to 5V systems: General Description The ASM811/ASM812 are cost effective low power supervisors designed to monitor voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power microprocessor (µP), microcontroller (µC) and digital systems. They provide excellent reliability by eliminating external components and adjustments. A reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. The ASM811 has an active-low output RESET that is guaranteed to be in the www.DataSheet4U.com correct state for VCC down to 1.1V. The ASM812 has an activehigh RESET output. The reset comparator is designed to ignore fast transients on VCC. A debounced manual reset input allows the user to manually reset the systems to bring them out of locked state. Low power consumption makes the ASM811/ASM812 ideal for use in portable and battery operated equipment. The ASM811/ ASM812 are available in a compact 4-pin SOT-143 package and thus use minimal board space. RESET THRESHOLD Suffix L M J T S R Voltage 4.63 4.38 4.00 3.08 2.93 2.63 Features New 4.0V threshold option 9µA supply current Monitor 5V, 3.3V and 3V supplies Manual reset input 140ms min. reset pulse width Guaranteed over temperature Active-low reset valid with 1.1V supply ...