ASM811 Datasheet | Alliance Semiconductor Corporation

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 ponents 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 .. correct state for VCC down to 1.1V. The ASM812 has an activehigh RESET output. The reset parator 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 pact 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 (ASM811) Small 4-pin SOT-143 package No external ponents Power-supply transient-immune design Applications - - - - - - - - puters and Controllers Embedded controllers Portable/Battery operated systems Intelligent instruments Wireless munication systems PDAs and handheld equipment Automotive systems Safety Systems Typical Operating Circuit VCC VCC µP MR RESET (RESET) GND RESET (RESET) Input GND Alliance Semiconductor 2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . .alsc. Notice: The information in this document is subject to change without notice October 2003 rev 1.0 ASM811, ASM812 SOT143 GND 1 ASM811 (ASM812) Pin...