ASM1811

www.DataSheet4U.com February 2005 rev 1.4 ASM1811 Low Power 5V µP Reset Active LOW, Open - Drain Output Applications Set-top boxes Cellular phones PDAs Energy management systems Embedded control systems Printers Single board computers General Description The ASM1811 is a voltage supervisory device with a low-power, 5V µP Reset, active LOW, open-drain output. Maximum supply current over temperature is a low 20µA. The ASM1811 generates an active LOW reset signal whenever the monitored supply is out of tolerance. A precision reference and comparator circuit monitor power supply (VCC) level. Tolerance level options are 5%, 10% and 15%. When an out-oftolerance condition is detected, an internal power-fail signal is generated which forces an active LOW reset signal. After VCC returns to an in-tolerance condition, the reset signal remains active for 150ms to allow the power supply and system microprocessor to stabilize. Typical Operating Circuit VCC ASM1811 The ASM1811 is designed with a open-drain output stage and operates over the extended industrial temperature range. Devices are available in low cost TO-92 and compact surface mount SOT-23 packages. Other low power products in this family include the ASM1810/ 12/15/16/17, ASM1233D and ASM1233M. RESET Microprocessor RESET GND Key Features Low Supply Current 20 µA maximum (5.5 V) Automatically restarts a microprocessor after power failure 150ms reset delay after VCC returns to an in-tolerance...